Liebert SRC User Manual2

Liebert® SRC-G
Precision Air Conditioning

User Manual
Copyright by Vertiv Co. Ltd.
The content in this document is subject to change without notice. All rights, including rights of translation,
reproduced by printing, copying, or similar methods, and even of parts, are reserved. Violators will be liable for
damages. All rights, including rights deriving from patent license or registration of a utility model or design, are
reserved. No part of this document may be reproduced or transmitted in any form or by any means without the
prior written consent of Vertiv Co. Ltd.
Notice
The purchased products, services, and features are stipulated by the contract made between Vertiv Co.,
and the customer. All or part of the products, services, and features described in this document may not be
within the purchasing scope or the usage scope. Unless otherwise specified in the contract, all statements,
information, and recommendations in this document are provided “AS IS” without warranties, guarantees, or
representations of any kind, either express or implied. The information in this document is subject to change
without notice. Every effort has been made in the preparation of this document to ensure the accuracy of the
contents, but all statements, information, and recommendations in this document do not constitute a warranty
of any kind, express or implied.
Vertiv Co., Ltd.
India
Homepage: www.vertiv.com
E-mail: support@vertiv.com
Asia Pacific
Homepage: www.vertiv.com.
E-mail: overseas.support@vertiv.com
For Technical Support, users may contact the nearest Vertiv Co. local sales office or service center.
Purpose of the Document
This document applies to the series of precision air conditioners and cooling solutions which maintain optimal
environmental control of technological ecosystems at minimal operating costs. This document gives an overview
of the specifications, installation, commissioning, and maintenance procedures with troubleshooting from the
user’s perspective. The figures used in this document are for reference only.
Please read this manual carefully before installing, maintaining, and troubleshooting.
VertivTM Liebert® SRC-G Precision AC is a professional device, only professionals are permitted to access the
unit, and is kept in a place where access is restricted to common people.
Styling used in this Guide

The styles used in the manual are defined as mentioned in the following table:
Situation Description
Warning/Danger/Caution • The Warning/Danger/Caution note indicates a hazardous or potentially
harmful situation that can result in death or injury. It also indicates
instructions that need to be adhered to, failing which may result in
danger and safety issues thereby having an adverse effect on the
reliability of the device and security. Even for practices not related to
physical injury, to avoid equipment damage, performance degradation, or
interruption in service, follow the warning instruction carefully.
Note
• The Note section indicates additional and useful information. It also calls
attention to best practices and industry-best protocols that are
standardized and help make maximum utilization of the resources at
hand. Helpful information related to the product also comes under the
Note heading, helping the users with the definitions, concepts, and
terminologies used in the manual.
Version History
Version Date
V1 09.03.2022
V2 19.06.2023
Safety Precautions and Measures
The important safety precautions and measures that should be followed during the installation and
maintenance are described in the following sections.
Read the manual prior to installation and operation of the unit. Only qualified personnel should move, install,
or service this equipment.
Before working on the equipment, the user reads and considers all precautions, compliance and safety
measures. The unit control must be used exclusively for the purpose which it is intended for; the
manufacturer takes no liability for incorrect use or a modification to the unit control.
Adhere to all the Warnings and Cautionary measures included in the manual.
Please read this manual carefully before installing, maintaining and troubleshooting; especially the
Warning/Danger/Caution information in the User Guide. Apart from the User Guide, also pay attention
to the warning labels on the unit and its components.
This manual is retained for the entire service life of the unit. The user must read all the precautions, danger,
warnings, and cautionary measures mentioned in the manual prior to carrying out any operations on the unit.
Each unit is equipped with an electric insulation which allows the users to work in safe conditions. The main
switch is positioned in terminal box of the indoor unit. Before any maintenance operation, switch off the unit
with this electrical insulation switch to eliminate risks such as electrical shocks, burns, automatic restarting,
moving parts, and remote control. The protective covers plate on terminal box shall be removed only after the
electric power has been cut off by isolation switch.
In the following sections, notice the various cautionary measures and warnings that need to be read carefully
prior to installing or operating the system.
Disconnect the local and remote power supplies prior to working with the unit.
Prior to the installation process, read all the instructions, verify if all the parts are in place, and check the
nameplate to ensure the voltage matches the available utility power for the unit.
The controller doesn’t isolate power from the unit even in the Off mode, and some internal components still
require and receive power during the Off mode.
Another aspect is the presence of small objects in the fans bay that can result in object ejection during the
fan start-up and there is a probable risk of being hit by these objects resulting in grievous injury and causing
equipment damage.
The unit contains fluids and gases under high pressure. Therefore, the pressure should be relieved before
working with the piping.
Various components such as compressors, refrigerant discharge lines, and humidifiers are extremely hot during
the unit operation (if applicable). Therefore, allow sufficient time for the unit to cool down before working with the
unit cabinet. Handle the unit with extreme caution and wear safety equipment such as protective gloves, safety
shoes, and arm protection while working with the hot compressors, discharge lines, and reheats.
There is a risk of water leaking that can damage both the equipment and the building. Effective water drain
connection and facilities should be available. Installation should be precise. Implementation of the application
and service practices should be appropriate and fault-free. Failure to comply with these norms will result in water
leakage from the unit. Water leakage can lead to massive damage and loss of critical equipment in the hosting
ecosystem. Therefore, care should be taken to ensure that the unit is not located directly above any equipment
that could sustain damage due to water and excessive moisture. Use of a leak detection system for the unit and
system supply lines are recommended by Vertiv.
Arc flash and electric shock hazard. Open all local and remote electric power supply disconnect switches,
verify with a voltmeter that power is Off and wear appropriate, OSHA approved personal peotective
equipment (PPE) per NFPA 70E before working within the electric control enclosure. Failure to comply
can cause serious injury or death. Customer must provide earth ground to unit and local codes, as
applicable. Before proceeding with installation, read all instructions, verify that all the parts are included
and check the nameplate to be sure the voltage matches available utility power. The Liebert controller
does not isolate power from the unit, even in the Unit Off mode. Some internal components require
and receive power even during the Unit Off mode of the controller. The only way to ensure that there
is No voltage inside the unit is to install and open a remote disconnect switch. Refer to unit electrical
schematic. Follow all local codes.
Table of Contents
Table of Contents
Chapter 1: Overview............................................................................................................................................................................1
1.1. Product Introduction..........................................................................................................................................................................................................1
1.1.1. Indoor Unit.......................................................................................................................................................................................................................1
1.1.2. Outdoor Unit...............................................................................................................................................................................................................2
1.1.3. Control Panel..............................................................................................................................................................................................................2
1.2. Model Description..............................................................................................................................................................................................................3
1.3. Basic Performance Parameters..............................................................................................................................................................................4
1.4. Main Components..............................................................................................................................................................................................................4
1.4.1. Indoor Unit....................................................................................................................................................................................................................4
1.4.2. Outdoor Unit..............................................................................................................................................................................................................6
1.4.3. Control Panel............................................................................................................................................................................................................. 7
1.5. Additional Components (Optional)....................................................................................................................................................................8
1.5.1. Remote Monitoring...............................................................................................................................................................................................8
1.5.2. Installation Accessories..................................................................................................................................................................................8
1.6. Environmental Conditions Requirements....................................................................................................................................................9
1.6.1. Operating Environment Requirements.............................................................................................................................................9
1.6.2. Storage Environment Requirements..................................................................................................................................................9
1.7. Refrigerant Charging Requirement.................................................................................................................................................................10
Chapter 2: Mechanical Installation................................................................................................................................. 12

2.1. Unpacking and Inspection........................................................................................................................................................................................12
2.2. Installation Notes..............................................................................................................................................................................................................13
2.3. System Installation Arrangement.................................................................................................................................................................... 14
2.3.1. System Arrangement during Installation..................................................................................................................................... 14
2.3.2. System Installation Mode...........................................................................................................................................................................15
Vertiv™ Liebert® SRC-G User Manual i

Table of Contents
2.4. Mechanical Installation...............................................................................................................................................................................................17
2.4.1. Dimension and Weight of the Indoor Unit (Product Dimension)..........................................................................17
2.5. Dimension and Weight of the Outdoor Unit............................................................................................................................................19
2.6. Indoor Unit Installation Procedure................................................................................................................................................................. 20
2.6.1. Equipment Room Requirements........................................................................................................................................................ 20
2.6.2. Installation Space Requirements...................................................................................................................................................... 20
2.6.3. Indoor Unit Installation..................................................................................................................................................................................21
2.7. Installation of Outdoor Unit....................................................................................................................................................................................25
2.7.1. Installation Notes.................................................................................................................................................................................................25
2.7.2. Holes Dimension of the Outdoor Unit Base.............................................................................................................................25
2.8. Refrigeration Piping Connection General Principles.................................................................................................................... 27
2.8.1. Quick Thread Connector Installation Notes.............................................................................................................................28
2.8.2. Piping Connection Requirements.....................................................................................................................................................28
2.8.3. Connecting Refrigerant Piping............................................................................................................................................................29
2.8.4. Pipe Connector Position.............................................................................................................................................................................29
2.8.5. Connecting Drain Piping Of Indoor Unit......................................................................................................................................31
2.9. Installation of Display Screen................................................................................................................................................................................31
2.10. Charging Refrigerant.................................................................................................................................................................................................32
2.10.1. Base Charging of Refrigerant...............................................................................................................................................................32
2.10.2. Adding Refrigerant for Long Piping System.........................................................................................................................33
2.10.3. Long Connecting Pipe System with Lubricant Oil..........................................................................................................33
2.11. Mechanical Installation Checklist...................................................................................................................................................................34
Chapter 3: Electrical Installation..................................................................................................................................... 35

3.1. Task Introduction..............................................................................................................................................................................................................35
3.1.1. Cables to Connect On-site..........................................................................................................................................................................35
Vertiv™ Liebert® SRC-G User Manual ii

Table of Contents
3.2. Installation Notes.............................................................................................................................................................................................................36
3.3. Indoor Unit Connection.............................................................................................................................................................................................37
3.4. Outdoor Unit Connection........................................................................................................................................................................................39
3.4.1. Control Panel Connection.........................................................................................................................................................................40
3.5. Electrical Installation Checklist......................................................................................................................................................................... 43
Chapter 4: Start-up Commissioning............................................................................................................................44

4.1. Start-up Inspection........................................................................................................................................................................................................ 44
4.2. Function Testing............................................................................................................................................................................................................. 45
4.2.1. Cooling......................................................................................................................................................................................................................... 45
4.2.2. Dehumidifying..................................................................................................................................................................................................... 46
Chapter 5: Controller Operation Instructions................................................................................................... 47

5.1. Feature........................................................................................................................................................................................................................................47
5.2. Graphic Screen Appearance.................................................................................................................................................................................47
5.3. Control Interface.............................................................................................................................................................................................................. 48
5.3.1. Function Buttons................................................................................................................................................................................................ 48
5.3.2. Power ON Screen............................................................................................................................................................................................. 50
5.3.3. Summary Screen............................................................................................................................................................................................... 50
5.3.4. Password Screen................................................................................................................................................................................................51
5.3.5. Main Menu Screen............................................................................................................................................................................................52
5.4. Menu Structure..................................................................................................................................................................................................................53
5.4.1. Alarm Menu and Options............................................................................................................................................................................53
5.4.2. Alarm Status.......................................................................................................................................................................................................... 54
5.4.3. Alarm History....................................................................................................................................................................................................... 54
5.4.4. Alarm Setting........................................................................................................................................................................................................55
5.5. Setpoint Menu....................................................................................................................................................................................................................56
Vertiv™ Liebert® SRC-G User Manual iii

Table of Contents
5.6. System Status Menu.....................................................................................................................................................................................................56
5.6.1. Analog Status Options...................................................................................................................................................................................56
5.6.2. Input/Output Status Options.................................................................................................................................................................57
5.6.3. Time/Date Options..........................................................................................................................................................................................57
5.6.4. Run Time Options.............................................................................................................................................................................................58
5.6.5. On/Off Record Options.................................................................................................................................................................................58
5.7. System Menu........................................................................................................................................................................................................................59
5.7.1. System Setup Options....................................................................................................................................................................................59
5.7.2. Outdoor Unit Options...................................................................................................................................................................................60
5.7.3. Optional Function Options.........................................................................................................................................................................61
5.7.4. Set Password Options....................................................................................................................................................................................61
5.8. Help Menu..............................................................................................................................................................................................................................62
5.9. Display Settings.................................................................................................................................................................................................................63
5.10. Sequencing Status.......................................................................................................................................................................................................63
5.11. Sequencing Setting..................................................................................................................................................................................................... 64
Chapter 6: System Operation and Maintenance............................................................................................66

6.1. Electrical Inspection...................................................................................................................................................................................................... 66
6.2. Indoor Unit Maintenance.........................................................................................................................................................................................67
6.2.1. Filter.................................................................................................................................................................................................................................67
6.2.2. Fan...................................................................................................................................................................................................................................67
6.2.3. Drain Pipe................................................................................................................................................................................................................ 68
6.2.4. Thermal Expansion Valve (TXV)...................................................................................................................................................... 69
6.3. Outdoor Unit Maintenance....................................................................................................................................................................................70
6.3.1. Refrigeration System......................................................................................................................................................................................70
6.3.2. Air-cooled Condenser..................................................................................................................................................................................70
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Table of Contents
6.3.3. High-Pressure Switch and Low-Pressure Switch............................................................................................................. 70
6.3.4. Compressor.............................................................................................................................................................................................................71
6.4. Monthly Routine Maintenance...........................................................................................................................................................................73
6.5. Routine Maintenance and Inspection (Semi-annually)..............................................................................................................74
Chapter 7: Troubleshooting...................................................................................................................................................77
Appendix I: Menu Structure....................................................................................................... 81
Vertiv™ Liebert® SRC-G User Manual v

Overview
Chapter 1: Overview
This chapter introduces the model description, product introduction, basic parameters, main components,
optional components, and ambient requirements of Vertiv™ Liebert® SRC-G Precision air conditioner
(hereafter Liebert SRC-G).
1.1. Product Introduction

The Liebert SRC-G is first of its kind innovative product with ‘zero’ footprint due to its wall mounted configuration.
The Liebert SRC-G is a small precise environment control system, specially designed for cooling the equipment
rooms. It is applicable in equipment rooms, computer rooms and similar eco-system. Featuring high reliability, it
can maintain a favorable environment for critical equipment such as sensitive equipment, industrial processing
equipment, communication equipment, and computers.
Liebert SRC-G is dedicatedly design to fit into small technological rooms. It is a wall mounted type unit, which has
maximum cooling capacity with nearly no footprint that helps in saving maximum space within equipment rooms.
It is specifically designed for easy serviceability from the front and sides of the unit. The unit design ensures even
air distribution in the small critical infrastructures.
1.1.1. Indoor Unit

Liebert® SRC-G has three models, Liebert® SRC03GES with 3 kW (0.9 TR), Liebert SRC07GES, Liebert
SRC07GET with 7 kW (2 TR), and Liebert SRC11GET with 11 kW (3.1 TR) cooling capacity respectively. Customers
can flexibly select the options according to the actual requirement of the equipment room.
No. Description No. Description

1 Top Mounting Bracket 5 Return air panels
2 Return air perforation 6 Panel hinges
3 Refrigerant in/out and Drain connections 7 SRC cabinet
4 Supply air grills
Figure 1-1 Liebert® SRC-G Indoor Unit
Vertiv™ Liebert® SRC-G User Manual 1

Overview
1.1.2. Outdoor Unit

The outdoor unit is specifically designed for Vertiv™ Liebert® SRC-G Indoor unit, which comprises compressor as
an integral part of outdoor assembly.

1 Condenser fan 3 Service valve
2 Outdoor unit cabinet 4 Electrical box cover plate
Figure 1-2 Liebert® SRC-G Outdoor Unit
Liebert SRC series is a comprehensive solution of indoor and outdoor units, Liebert SRC-G outdoor unit is a
integral part of Liebert SRC-G unit.
1.1.3. Control Panel

The control panel is designed for Libert SRC-G unit, comprised of controller, display and switchgear set.

1 Cable gland set 4 Panel cabinet
2 Display 5 Cabinet door
3 Panel lock 6 Ventilation louvers
Figure 1-3 Microprocessor Controller Interface

Overview
1.2. Model Description

Vertiv™ Liebert® SRC-G series is fully defined by 18 digits, as represented in Table 1-1.
Table 1-1 Liebert® SRC-G Model Nomenclature
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
S R C 0 7 G E S A S 0 S A B D 0 0 0
Digit 1, 2, 3 Product Model Digit 12 Compressor
SRC Small Room Cooling S Scroll
Digit 4,5 Net Cooling Capacity kW R Rotary

03, 07,
Nominal Net Cooling Capacity - kW E Digital Scroll
and 11
Digit 6 Features Digit 13 Refrigerant
G Global A R410A
Digit 7 Fan C R407C
E EC Fan Digit 13 System Type
A AC Fan A Air-cooled Condenser
Digit 8 Power Supply Digit 14 Enclosure Color
S 230 V, 50 Hz B RAL9005
T 400 V, 50 Hz Digit 15 Packaging
Digit 9 Frequency D Domestic
A 50 Hz E Export
Digit 10 Controller Digit 16 Order Identifier
S Standard 0-9 Factory Code
P PACC Digit 17 Order Identifier
Digit 11 Monitoring 0-9 Factory Code
0 Monitoring Digit 18 Order Identifier
1 No Monitoring 0-9 Factory Code
The standard components are represented in ‘Bold Italic’ font in Table 1-1.

Overview
1.3. Basic Performance Parameters

The basic performance parameters of the Vertiv™ Liebert® SRC-G are shown in Table 1-2.
Table 1-2 Basic Performance Parameters of Liebert® SRC Units
Model Nominal Cooling Capacity* Power*

SRC03GES 3.270 kW 1.03 kW
SRC07GES 7.490 kW 2.27 kW
SRC07GET 8.018 kW 2.45 kW
SRC11GET 10.902 kW 3.10 kW
*Above mentioned capacity and power consumption are calculated at Indoor conditions of 24 °C/50% RH and
35 °C Outside ambient temperature.
Due to continuous upgrade of the unit, the technical parameter are subject to change without prior notice,
therefore for the details of the parameters refer to the respective nameplate of the unit.
1.4. Main Components
1.4.1. Indoor Unit

Liebert SRC-G indoor unit consists of an evaporator, EC fan, thermal expansion valve, and filter dryer. For optional
component details, refer to Section 1.5.
• Cabinet
The cabinet of the unit is prepared by a steel sheet of 1.2 mm thickness, which is custom powder coated
to protect against corrosion with the air-stream insulation thickness of 10 mm; the color code of the unit is
RAL9005.
• Evaporator Coil
The evaporator is a hydrophilic-coated fin-tube heat exchanger with a high sensible heat factor (>0.9). The
distributor is designed and verified accordingly to ensure that the refrigerant (R410A) is distributed evenly in
each loop, improving the efficiency of the heat exchanger to a great extent.
• EC Fan
The unit is fitted with one/two direct-driven, high efficiency, single inlet, backward curved, centrifugal ‘plug’ type
fan (s), with aluminum nozzle (s) and PA Plastic impeller (s). The fan motors are Electronically Commutated (EC),
IP54, with internal protection and speed regulation via controller signal. The fans are statically and dynamically
balanced.

Overview
Figure 1-4 EC Fan
• Thermal Expansion Valve (TXV)

Vertiv™ Liebert® SRC-G unit has an external equalizer type Thermal Expansion Valve (TXV) that collects
temperature and pressure signals simultaneously to accurately regulate the refrigerant flow into the evaporator.
Figure 1-5 Thermal Expansion Valve (TXV)
• Filter Dryer
The moisture can adversely affect the operations and service life of a system in the refrigeration life-cycle. In
order to rectify this condition the unit is equipped with a filter dryer that can filter out, remove, hold, and prevent
the moisture particles from circulating through the system.
Figure 1-6 Filter Dryer

Overview
• Air Filtration
The unit is equipped with a G4/MERV8 nylon filter with 90% down to 10 micron particle arrester efficiency. It
features a compact structure and easy maintenance. It can be washed repeatedly.
• Return Air Temperature Sensor (PEX1142)

Vertiv™ Liebert® SRC-G unit is provided with a return air temperature sensor which not only reads the inlet air
temperature returning from the room but also provides the value of the relative humidity of the returning air. It is
used to modulate the cooling effect of the unit by controlling the return air temperature, and also maintains the
humidity by eliminating the excess moisture in the room.
Temperature limits are field adjustable via display interface. The cooling or dehumidification warning activates
when the temperature or humidity exceeds the threshold values respectively.
• Supply Air Temperature Sensor

Liebert SRC-G series is equipped with a Negative Temperature Coefficient (NTC) type supply air temperature
sensor which helps in monitoring supply air temperature of the unit.
1.4.2. Outdoor Unit

The Liebert SRC outdoor unit consists of compressor, condenser coil, and fan.
• Compressor
The Liebert SRC-G series outdoor unit consists of the rotary compressor for Liebert® SRC03GES and the scroll
compressor for Liebert® SRC07GES, Liebert® SRC07GET, and Liebert® SRC11GET models with high efficiency. It
uses environment-friendly refrigerant (R410A) and features low vibration, low noise, and high reliability.
Figure 1-7 Scroll Compressor
• Condenser Coil
The unit is equipped with a uniquely designed hydrophilic fin-tube heat exchanger (condenser) with the wavy fin
on the surface, which facilitate a high heat transfer rate. The condenser also has an easy cleaning feature thereby
enabling easy maintenance of outdoor unit.

Overview
• Fan
The Liebert SRC-G outdoor unit fan has axial flow blades with low noise. It also has a high-performance single-
phase motor which enables airflow modulation based on compressor pressure reading as per set parameters.
Figure 1-8 Axial Flow Blade
1.4.3. Control Panel

• Microprocessor Controller
The Liebert® SRC-G unit is configured with the graphics color screen display with simple user-friendly interface
operation. The multi-level password protection feature can effectively prevent unauthorized operation. It also
provides self-recovery up on power failure; high and low voltage protection functions; phase loss protection; and
automatic phase-sequence switching upon anti-phase. The operation status of the components is available on
the respective menus.

1 LCD screen 3 Alarm indicator
2 Run state indicator 4 Control buttons
Figure 1-9 Microprocessor Controller Screen

Overview
1.5. Additional Components (Optional)
1.5.1. Remote Monitoring

Vertiv™ Liebert® SRC-G series adopts the SNMP communication protocol; through the configured LAN port.
The Liebert SRC-G can communicate with the host computer and receives the control instructions of the host
software.
1.5.2. Installation Accessories

The Liebert SRC-G unit is recommended to be installed with accessories as per Table 1-3.
Table 1-3 Accessories for Different Models
Name of Item SRC03GES SRC07GES SRC07GET SRC11GET

pipe 1/2” with
Gas (Suction) pipe 5/8” with insulation 5/8” with insulation 7/8” with insulation
insulation
Liquid (Discharge) pipe 3/8” with insulation 3/8” with insulation 3/8” with insulation 3/8” with insulation
Indoor power cable 3C x 1.5 mm2 3C x 1.5 mm2 3C x 1.5 mm2 3C x 1.5 mm2
Fan control cable 3C x 0.5 mm2 4C x 0.5 mm2 4C x 0.5 mm2 5C x 0.5 mm2
Outdoor power cable* 2C x 2.5 mm2 2C x 2.5 mm2 4C x 2.5 mm2 4C x 2.5 mm2
Fan and contactor 4C x 0.5mm2
Outdoor HP and LP
3C x 0.5 mm2
cable
Outdoor pressure
3C x 0.5mm2
sensor cable
All field cables are recommended as armored cables in order to avoid external influences such as rat bites etc.

Overview
1.6. Environmental Conditions Requirements
1.6.1. Operating Environment Requirements

The operating environment requirements for Liebert® SRC-G are given in Table 1-4.
Table 1-4 Operation Environment Requirements
Item Requirements
The maximum equivalent horizontal distance between indoor and outdoor units[1]: 60 m;
Installation position
Vertical distance ΔH[2]: -5 m ≤ ΔH ≤ 30 m
Indoor unit: horizontal airflow mode (Wall mounted);
Installation mode
Outdoor unit: horizontal airflow mode
Indoor: 21 °C to 30 °C/45% RH to 55% RH
Ambient condition
Outdoor: -15 °C to +45 °C (standard model) (it can sustain up to 48 °C outside ambient
range
temperature)
Altitude < 1000 m, derating is required when location altitude is above 1000 m
SRC03GES: 1P, 230 V± 10%, 50 Hz ± 5%

Operating Power SRC07GES: 1P, 230 V± 10%, 50 Hz ± 5%
range SRC07GET: 3P, 400 V± 10%, 50 Hz ± 5%
SRC11GET: 3P, 400 V± 10%, 50 Hz ± 5%
1. For the equivalent lengths of components, refer to Table 2-9.
2. The value of ΔH is positive if the outdoor unit is installed above the indoor unit; ΔH is negative if the indoor
unit is installed above the outdoor unit.
1.6.2. Storage Environment Requirements

The storage environment meets the requirements of GB/T 4798.1-2005 and the requirements are listed in
Table 1-5.
Table 1-5 Storage Environment Requirements
Item Requirements
Storage environment Clean indoor without dust
Ambient humidity 5% RH to 95% RH
Ambient temperature -25 °C to +55 °C (transport environment temperature: -40 °C to +70 °C)
Total transportation and storage time should not exceed six months, otherwise, the
Storage time
performance of the system needs to be re-calibrated.

Overview
1.7. Refrigerant Charging Requirement

Vertiv™ Liebert® SRC-G is specifically designed for environment-friendly refrigerant (R410A) and the unit is
supplied with factory-charged refrigerant suitable for 10 m piping distances to deliver optimum design condition
and efficiency. If the piping distance of the outdoor unit is more than 10 m, refer to Section 2.8 for the details on
the quantity of refrigerant to be charged inside the system.
Do not use sub-standard quality refrigerant as it may cause extensive damage to the system. Vertiv does not
undertake any responsibility for all the related consequences that result from using low-quality or inferior
refrigerant.

Mechanical Installation
Chapter 2: Mechanical Installation

This chapter describes the mechanical installation of Vertiv™ Liebert® SRC-G, including unpacking and
inspection, installation notes, system installation arrangement, installing indoor and outdoor units, piping,
removing transportation fasteners and adding refrigerant for long pipe systems, and inspection items.
2.1. Unpacking and Inspection

Move the unit to the location near to the final installation site and then unpack the packaging and de-palletize
the pallet of Liebert SRC-G unit as illustrated in Figure 2-1.

1 Indoor unit 5 Fastening support/L-Clamp
2 Outdoor unit 6 Bolt
3 Fastener (cable tie) 7 Control panel box
4 Stand/Platform/Pallet
Figure 2-1 Unpacking and De-palletized of Liebert® SRC-G Unit

Check that the fittings are complete and the components are intact against the packing list. If any parts are
found missing or damaged, report immediately to the local office of the carrier and the Vertiv representative. Do
not accept a damaged unit.
Liebert® SRC-G indoor unit is factory charged with Nitrogen at 0.2 MPa (2 bar) pressure. After unpacking,
check the unit and if the Nitrogen pressure is less, then consult Vertiv representative.

2.2. Installation Notes

• Vertiv™ Liebert® SRC-G indoor unit is wall mounted and the outdoor unit is installed outside of equipment/
computer room or on the floor of other rooms, still it is recommended to provide adequate maintenance space
for indoor (refer to Figure 2-5) and outdoor units while installation.
• Vertiv recommends that the site preparation is defined as per the requirements. However, if these
requirements are not met, Vertiv recommends that rectifications should be made on the site in order to
comply with the specified requirements and conditions.
• However, if the rectifications or modifications are not implemented as per instruction, then Vertiv does not
guarantee the accuracy and precision of the temperature and humidity provided by the unit.
• The Liebert SRC-G indoor unit is charged in the factory with nitrogen at 0.34 MPa (3.4 bar) pressure for
shipping; before installation release the internal nitrogen of the unit.
• The installers must strictly follow the design drawings for installation and reserve the space for maintenance.
The manufacturer’s engineering dimension drawings can serve as a reference.
• The Liebert SRC-G outdoor unit is pre-charged in the factory with R410a gas equivalent of 10 m piping. For
further piping lengths contact Vertiv local technical representatives.

2.3. System Installation Arrangement
2.3.1. System Arrangement during Installation
The refrigerant piping is required to connect the indoor and the outdoor units of the air-cooled system.
The system arrangement diagram of the refrigeration system is shown in Figure 2-2.

1 Compressor 9 Evaporator coil
2 Condenser coil 10 TXV bulb
3 Liquid line Schrader valve 11 Gas (suction) line Schrader valve
4 Liquid line Service valve 12 Gas line flared connection
5 Liquid line 13 Trap (as per piping details)
6 Liquid line flared connection 14 Gas line
7 Filter and drier 15 Gas line service valve
8 Expansion valve
Figure 2-2 System Arrangement Diagram

2.3.2. System Installation Mode
The system installation schematic diagram explains the process of installation of the outdoor unit.

1 Outdoor Unit 5 Indoor Unit
2 Mounting floor 6 Seal for pipe protection through wall
3 Condensate drain pipe 7 Liquid line
4 Wall 8 Gas line (1:100)
Figure 2-3 Indoor Unit is Placed Higher than Outdoor Unit during Installation


1 Outdoor unit 5 Condensate drain pipe
2 Stand/Platform/Raised Platform 6 Indoor Unit
3 Liquid (Discharge) line 7 Wall
4 Seal for pipe protection through wall 8 Gas (Suction) line (1:100)
Figure 2-4 Indoor Unit is Placed Lower than Outdoor Unit during Installation
The illustration in Figure 2-3 depicts the schematic diagram of system installation when the indoor unit is
installed at a lower level than the outdoor unit. The maximum height difference allowed in this case is 5 m. When
the indoor unit is installed at a higher level than the outdoor unit, the maximum allowed height difference is 30 m
(refer to Figure 2-4). The maximum allowed equivalent piping length is 60 m.

2.4. Mechanical Installation
2.4.1. Dimension and Weight of the Indoor Unit (Product Dimension)
The maintenance space of Liebert® SRC-G models is given in Figure 2-5 and the dimensions of models
SRC03GES, SRC07GES, SRC07GET, and SRC11GET are depicted in Figure 2-6. Table 2-1 represents the
maintenance space of all the indoor units and Table 2-2 represents the dimension and operational weight of all
the indoor units.

1 Liebert SRC Indoor Unit 2 Maintenance Space
Figure 2-5 Maintenance Space of Liebert SRC-G Model

Table 2-1 Maintenance Space of Liebert SRC-G Indoor Unit Models
A B C D E
Model
(mm) (mm) (mm) (mm) (mm)
SRC03GES 710 200 520 500 500
SRC07GES 1150 200 520 500 500
SRC07GET 1150 200 520 500 500
SRC11GET 1450 200 520 500 500
Figure 2-6 Liebert SRC-G Indoor Unit Model
Table 2-2 Mechanical Parameters of Indoor Units
Dimensions (W × D × H) Operational
Model
mm Weight (kg)
SRC03GES 649 x 424 x 490 40
SRC07GES 1109 x 424 x 490 50
SRC07GET 1109 x 424 x 490 50
SRC11GET 1409 x 424 x 490 60

2.5. Dimension and Weight of the Outdoor Unit

The dimensions of outdoor unit models SRC03GES, SRC07GES, SRC07GET, and SRC11GET are depicted in
Figure 2-7 and Table 2-3 represents the dimensions and weight of all the outdoor units.
Figure 2-7 Liebert SRC-G Outdoor Unit Model
Table 2-3 Mechanical Parameters of Outdoor Units
Dimensions (W × D × H) Operational
Model
mm Weight (kg)
SRC03GES 970 x 410 x 610 70
SRC07GES 970 x 410 x 800 85
SRC07GET 970 x 410 x 800 85
SRC11GET 970 x 410 x 1170 95

2.6. Indoor Unit Installation Procedure
2.6.1. Equipment Room Requirements
The equipment room must be prepared before installation to ensure a smooth operating flow and to achieve the
expected results. The data center must meet the standards to be properly ventilated and heated. The design
specifications for the air conditioners must be ideal and should correspond to energy-efficient design standards.
Following are the requirements to maintain a favorable room environment prior to the installation.
• The equipment room should have suitable and effective heat insulation. The equipment room should have
a sealed and damp-proof layer. Polyethylene film should be used for the damp-proof layer of the ceiling and
walls. Alternatively, a moisture-proof paint can be used to simulate the same effect as that of Polyethylene. It is
important to ensure that the coating on the concrete wall and floor is damp-proof.
• Outdoor air significantly increases the load of cooling and dehumidification. Therefore, all the doors and
windows must be closed. Gaps and seams must be very narrow to prevent the outdoor air from entering the
equipment room. It is an industry best practice to keep the infiltration of the outdoor air below 5% of the total
indoor airflow. Apply appropriate thermal insulation and antifreeze measures for outdoor water pipes to avoid
poor drainage and insufficient water supply caused by freezing.
• As indoor units are wall mounted, ensure that the mounting wall strength should be rigid enough to support
static and dynamic forces induced during the ideal and working conditions of indoor unit respectively.
• Vertiv recommends that the site preparation is defined as per the requirements. However, if these
requirements are not met, Vertiv recommends that rectifications be made on the site in order to comply
with the specified requirements and conditions.
• However, if the rectifications or modifications are not implemented, then Vertiv does not guarantee the
accuracy and precision of the temperature and humidity provided by the unit.
2.6.2. Installation Space Requirements
Adequate installation space for the indoor unit must be provided. The indoor unit of the air-cooled product must
be installed on the wall of an equipment room or computer room and the outdoor unit must be installed outside
of the data center, open to external ambient. Figure 2-8 indicates the installation location of the indoor unit.


1 Recommended area for unit installation 3 Not recommended area for unit installation
2 IT Equipments 4 Layout of the room
Figure 2-8 Installation Location of the Indoor Unit
• Do not use the indoor unit in the open and severe outdoor environment.
• Avoid locating the indoor unit in concave or narrow areas, which can obstruct the airflow, shorten the
cooling cycle and result in air return short cycle and air noise.
• Avoid locating multiple indoor units close to each other which can result in the short cycle of air and cre-
ate the load imbalance. The minimum distance between adjacent units is 600 mm.
• Do not install the unit within the vicinity of any other precision cooling equipment to avoid the leakage of
condensed water produced due to imbalance load conditions.
• Do not install other devices (such as smoke detectorx) over the indoor cabinet.
Vertiv™ Liebert® SRC-G can generate condensate water. Water leakage can cause damage to other equipment
nearby. Do not install the units in the vicinity of any precision equipment. The installation site must have the
facility of drainage piping.
2.6.3. Indoor Unit Installation
Two mounting brackets are supplied in the installation kit of the unit, these brackets are sized according to the
dimensions, weight, and height of the indoor unit models. Figure 2-9 and Table 2-4 provide the dimensional
details of the indoor unit.
Liebert SRC-G indoor unit contains a set of two installation brackets Left and Right-Hand brackets as shown in
the Figure 2-9, installation team must ensure to use of the respective bracket as per its suitable orientation.

Figure 2-9 Mounting Frame for Indoor Unit
Table 2-4 Mounting Bracket Dimension of the Indoor Units
Model A B C D F G H I
SRC03GES 50 320 58 272 70 134 25 70
SRC07GES 50 320 58 272 70 134 25 70
SRC07GET 50 320 58 272 70 134 25 70
SRC11GET 50 320 58 272 70 134 25 70
Follow the step by step procedure to install the Liebert® SRC-G Indoor unit.
Step 1: Figure 2-10 illustrates the drill holes of dimension Ø 10 mm for expansion bolts and their locations for
SRC03GES, SRC07GES, SRC07GET, and SRC11GET models.

Figure 2-10 Location of the Expansion Bolt Holes
Table 2-5 Dimension of the Expansion Bolt Holes
Model A B C D E F G H J
SRC03GES 288.6 531 NA 185 342 134 258 605 10
SRC07GES 288.6 475 475 185 342 134 258 1014 10
SRC07GET 288.6 475 475 185 342 134 258 1014 10
SRC11GET 288.6 625 625 185 342 134 258 1315 10
Figure 2-11 Location of the Expansion Bolt Holes

Step 2: Rigidly mount the mounting brackets with reference to the expansion bolts, refer to Figure 2-12 for better
understanding.
Figure 2-12 Placement of Bottom Mounting Bracket
Step 3: After successfully mounting all the supporting brackets, check the mounting is rigid to sustain the load of
the indoor unit; then place the indoor unit with the standard lifting tools for example a ‘forklift’. It is recommended
installation should be carried out only by trained professionals.
All the illustrations are for reference only, the actual site mounting may differ as per requirement,
consult Vertiv professional before installation.

2.7. Installation of Outdoor Unit
2.7.1. Installation Notes

• Install the outdoor unit for better security and maintenance accessibility. Do not install it on ground-level
sites where the public can access it easily.
• The outdoor unit should be installed away from the residential area. Do not locate it directly in an
environment that requires low noise.
• To ensure the cooling performance of the unit, install the outdoor unit in the outdoor with sufficient airflow.
Do not install where dust or snow can obstruct the condensing coil.
• Ensure that there is no steam around the unit, waste heat, and so on.
2.7.2. Holes Dimension of the Outdoor Unit Base
Fix the outdoor unit onto the base with expansion bolts, refer to Figure 2-13 for the vertical installations of the
outdoor unit. The hole dimension of the base for vertical installations is given in Table 2-6.
No. Description
1 Long waist hole (4-10x12)
Figure 2-13 Hole Dimension of Outdoor Unit Base (Vertical Installation)
For vertical installation, first fix the bracket frame to the installation floor, then install the outdoor unit
on the base frame.

Table 2-6 Outdoor Unit Mounting Hole Size
Installation Mode Model A (mm) B (mm)

SRC03GES 656 410
SRC07GES 656 410
Vertical installation
SRC07GET 656 410
SRC11GET 656 410

1 Outdoor unit 3 Base
2 Bracket 4 Outdoor unit base
Figure 2-14 Vertical Installation of Multiple Outdoor Units with One above the Other
• Use 5# angle iron for the bracket, when two units are installed with one above the other.
• Use 6.5# channel steel for the bracket, when three units are installed with one above the other.

2.8. Refrigeration Piping Connection General Principles

1. Copper pipes with quick thread connectors are used to connect the indoor and the outdoor units. If the pipe
length exceeds the standard pipe length given in the Table 2-7 and straight copper pipe is used, then each
joint of the piping must be brazed properly. Charge the copper piping with nitrogen gas during the brazing
process to prevent it from oxidation.
2. The selection, placement, and fixing of piping, evacuating the refrigerant from the system and refrigerant
charging are required to operate according to industry standards.
3. The parameters such as pipeline pressure drop, compressor return oil, noise reduction, and vibration should
be considered when designing and constructing process.
4. If the equivalent length exceeds 60 m, or the vertical height difference between the indoor and the outdoor
units exceeds the values given in Table 2-8, consult Vertiv local representative for technical support before
installation and if any modification is required.
5. The equivalent lengths of the components are shown in Table 2-9, and the resistance losses caused by the
elbows and valves have been taken into account. Consult Vertiv representative to confirm the suitability as
per the site conditions.
Table 2-7 Standard Piping Dimensions
Pipe Length Gas Pipe OD Liquid Pipe OD

Model
m inch mm inch mm
SRC03GES 10 1/2” 13 3/8” 10
SRC07GES 10 5/8” 16 3/8” 10
SRC07GET 10 5/8” 16 3/8” 10
SRC11GET 10 7/8” 22 3/8” 10
Table 2-8 Vertical Distance between the Indoor and the Outdoor Units
Relative Position Distance

Outdoor unit installed higher than indoor unit Maximum: 30 m
Outdoor unit installed lower than indoor unit Maximum: 5 m
Table 2-9 Equivalent Length of Each Local Component
Liquid Pipe OD Equivalent Length (m)

(inch) 90° Elbow 45° Elbow T-type Three Way
5/8 0.27 0.15 0.76
3/4 0.3 0.18 0.76
7/8 0.44 0.24 1.1
1-1/8 0.56 0.3 1.4

2.8.1. Quick Thread Connector Installation Notes
Refer to the following procedure when connecting the quick thread connector:
1. Remove dust-proof caps
2. Carefully clean the coupling seats and threaded surface of the connector with a clean cloth
3. Lubricate the male thread with lubricant oil
4. Thread the coupling halves together by hand to ensure that the threads mate properly
5. Tighten the coupling body’s hexagon nut and union valve until a definite resistance is felt
6. Use a marking pen to draw a line lengthwise from the coupling union nut to the bulkhead. Tighten the nuts an
additional quarter turn with two wrenches
7. The misalignment of the lines shows how much the coupling has been tightened
• Care must be taken while performing this operation to avoid any damage to the connector threading.
• Two wrenches must be used to cooperate with each other during connection because one wrench can
damage the coupling copper lines easily.
The recommended torque values are listed in Table 2-10.

Table 2-10 Recommended Torque Value
Coupling Size Torque Value (N.m)
5/8” 7 to 8
1/2” 15 to 18
3/4”, 7/8” 25 to 32
2.8.2. Piping Connection Requirements
Refer to Figure 2-2 and Figure 2-3; the required piping connections are as follows:
• Refrigerant piping between the indoor and the outdoor units (gas and liquid piping).
• Drain piping connections of the indoor unit.
Prior to the start-up, ensure that all the piping connections have been completed and there is no leakage in
the system.

2.8.3. Connecting Refrigerant Piping

• The pipe should be installed and removed with care so that it will not get damaged. Use tube benders and
make all bends before connecting the refrigerant piping of the indoor and the outdoor units.
• If brazing is required, all refrigerant piping should be connected with silver-brazed joints. The copper pipe is
filled with nitrogen gas during the brazing process to prevent oxidation of the copper piping.
• Prior to use, check piping supports, leakage testing, dehydration of refrigerant pipes, and evacuation. Use
vibration isolating support to isolate the refrigeration piping from the building.
• Use a soft and flexible material to pack around the piping to protect them when sealing openings in walls and
to reduce vibration transmission.
• When installing the outdoor unit 5 m higher than the indoor unit, the trap should be installed on the gas pipe
(Oil trap). This trap will retain lubricant oil in the off-cycle of the compressor. When the compressor starts, oil
in the trap will be carried up the vertical riser and return to the compressor immediately.
• If the piping equivalent length exceeds 30 m then the ‘Long piping kit’ should be added.
• If the equivalent pipe length exceeds 60 m, please consult Vertiv local representative for details.
• Copper pipe with outer diameter of 16/13 mm, wall thickness requirement is 0.8 mm; copper pipe with outer
diameter of 10 mm, wall thickness requirement is 0.6 mm.
2.8.4. Pipe Connector Position
Figure 2-15 shows the pipe connector cutout locations of the indoor unit for indoor and outdoor
units respectively.

1 Service valves 3 Liquid pipe
2 Drain water pipe 4 Suction (gas) pipe
Figure 2-15 Pipeline Connector Interface (Indoor Unit)


1 Gas (Suction) pipe 2 Liquid (Discharge) pipe
Figure 2-16 Pipeline Connector Interface (Outdoor Unit)
• Connecting Gas (Suction) pipe
Connect one end of the gas pipe connector of the indoor unit shown in Figure 2-15 to the other end of the gas
pipe connector of the outdoor unit shown in Figure 2-16.
The gas pipe is the pipe at the compressor discharging side. Horizontal sections of the liquid pipe should be
sloped down from the compressor with a slope of at least 1:100 (10 mm down for each 1 m run). The gas pipes
should be insulated where they are routed in the conditioned space.
As indoor unit is charged with Nitrogen 0.34 MPa (3.4 bar) pressure, release the Nitrogen safely in the
atmosphere.
• Connecting Liquid (Discharge) pipe
Connect one end of the liquid pipe connector of the indoor unit shown in Figure 2-15 to the other end of the liquid
pipe connector of the outdoor unit shown in Figure 2-16.
Ensure service valve of outdoor unit are firmly close during piping connection, as the outdoor unit is
pre-charged with refrigerant equivalent to 10 m piping, refer Figure 2-11 for pre-charged details.

2.8.5. Connecting Drain Piping Of Indoor Unit
Connect one end of the drain pipe to the connector of condensate water drain pipe shown in Figure 2-15. The
drain pipe of the indoor unit has reserved a copper pipe with 1/2” nozzle to connect to the drain pipe, and use a
1/2” inch braided hose provided along with unit. The hose could be tightened with the help of worm clip.
In case outside weather is freezing, drain pipe should be provided with sufficient insulation in order to avoid
freezing inside pipe.
2.9. Installation of Display Screen

Liebert® SRC-G unit is provided with a control panel which can be simply mounted on the wall with the help of
screw arrangement. Refer the following procedure to mount the control panel.
1. Figure 2-17 shows the mounting arrangement of control panel. Surrounding clear spacing shall be in
accordance with Figure 2-5. Put two screws (M6 CSK) into the wall at the location as depicted in the
illustration.
Figure 2-17 Mounting Arrangement of Display Screen
2. Once the screws are rigidly placed, anchor the control panel by matching the screws to their respective holes.
Ensure that the screws are firmly fixed and can sustain weight of the control panel.
3. Ensure the cables connecting to the control panel to indoor unit and outdoor unit are properly routed and

carefully insulated. Contact Vertiv technical personnel before selecting the location for control pane.
4. Its recommended terminate incoming power in control panel via external isolation in proximity of control panel
(refer Figure 2-7). This isolation in case of isolation switch shall comply to IEC60204-1 (black -white color
scheme). Incase of rotary switch, same shall comply to IEC60947-3 utilization AC-23 or DC23B. Following table
provides rating for this isolation.
Unit Isolation rating

SRC03GES 3Pole, 16A
SRC07GES 3Pole, 25A
SRC07GET 5Pole, 16A
SRC11GET 5Pole, 32A
2.10. Charging Refrigerant

• System Vacuuming
1. After the refrigeration piping are installed and connected, ensure the service valves of outdoor unit are firmly
closed.
2. Then connect the high and low pressure composite pressure gauge (Manifold) to the Schrader valve at the
liquid piping of indoor unit that can be easily accessed from a front service window.
3. Evacuate system twice to 1500 microns and then finally to 500 microns. Break vacuum each time with 50 gm
of clean and dry R410A refrigerant.
4. Open service valve of outdoor units.
• Ensure to remove all the pressure gauges (manifold) from the indoor unit after vacuuming is completed.
• Ensure to open the service valve of the condensing unit.
• After the mechanical installation, electrical installation, and pre-commissioning inspection of the unit is
completed, then only turned on the unit.
2.10.1. Base Charging of Refrigerant
The indoor unit is factory charged and the recommended standard refrigerant amount (kg) of the unit is shown
in Table 2-11.
Table 2-11 Recommended Standard Refrigerant Amount of the Unit (unit: kg)
Unit Model SRC03GES SRC07GES SRC07GET SRC11GET
Standard charge
1.5 2.5 2.4 3.3
(standard pipe length within 10 m)

2.10.2. Adding Refrigerant for Long Piping System
Under the condition of the standard pipe length (within 10 m) there is no need to charge the refrigerant in the
indoor unit. If the pipe length exceeds 10 m then Liebert® SRC-G series can be charged with reference to the
recommended refrigerant charging amount. Add refrigerant to the system in order to ensure normal system
operation according to the following formula:
Adding refrigerant amount (kg) = Adding refrigerant amount per meter of liquid pipe (kg/m) × Total length
of extended liquid pipe (m).
• The air in the hose connected to the composite pressure gauge is vacuumed.
• If the pipe length exceed 10 m, then refrigerant cylinder is kept up-side-down (depending on the size of the
cylinder, consult Vertiv local representative for details) during the charging of the refrigerant to ensure that
the refrigerant is charged into the refrigeration system in a liquid state.
• After the mechanical installation, electrical installation, and pre-commissioning inspection of the unit is
completed, the unit is turned on and the unit system is charged with liquid refrigerant.
• For your personal health, please wear earmuffs or earplugs and other equipment to protect your hearing
after entering the computer room.
• Observe the compressor suction line to ensure that the piping and compressor housing are free of
condensation to eliminate potential liquid impact hazards.
• On successful charging of gas, suction superheat will be 10 K and condenser sub-cooling is 5 K.
The adding refrigerant amount per meter of liquid pipe is given as
Total length of extended liquid pipe (m) = Total length of liquid pipe - 10 m
The amount of refrigerant required for SRC03GES is 50 g/m per meter length of pipe, for SRC07GES and
SRC07GET is 55 g/m per meter length of pipe and SRC11GET 60 g/m.
2.10.3. Long Connecting Pipe System with Lubricant Oil
The charging of refrigerant can dilute the lubricant oil in the system and affects the lubricating and cooling
properties of the lubricant oil. Therefore, the lubricant oil should be added in the beginning. The lubricant oil used
in the Liebert® SRC-G units for SRC03GES is HAF68D1C, and for SRC07GES, SRC07GET and SRC11GET
is POE RL 32-3MAF:
The adding lubricant oil amount for the liquid piping length more than 10 m.
Amount of additional lubricant oil (ml) = Adding refrigerant amount (kg) x 22.6

• A certain type of POE lubricant that is directly supplied by Vertiv must be used, otherwise the compressor
may get damaged. When charging the refrigeration system with oil, consult Vertiv representative for more
details on adding the lubricant oil.
• Adding inferior or incorrect type of lubricant oil will damage the system, so the problems caused due to
quality are not covered by the warranty.
• Do not use inferior quality refrigerant.
• For any consequences resulting from inferior quality refrigerant, Vertiv does not assume warranty
responsibility. Select the type of lubricant oil in accordance with the compressor manufacturer’s
specification.
2.11. Mechanical Installation Checklist

Following are the particulars in the checklist (refer Table 2-12) that need to be verified and confirmed to ensure
that the mechanical installation is implemented successfully.
Table 2-12 Installation Inspection Checklist
Particulars Results
Leave enough space around the unit for maintenance.
Ensure the installation fasteners have been fixed firmly.
The pipes between the indoor and outdoor units have been connected, and the
service valves of the indoor and outdoor units have been opened completely.
The drain pipe has been connected.
All pipe joints tightened.
Irrelevant things (such as transportation material, structure material, and tools) inside
or around the unit have been cleared after the unit is installed.

Electrical Installation
Chapter 3: Electrical Installation

In this chapter, the electrical installation of Vertiv™ Liebert® SRC-G unit is explained in-depth to help users with
the various activities, which include work introduction and installation notes, connecting power cables of the
indoor and outdoor units, connecting the control cables, and the installation inspection.
• Liebert SRC-G is a range of sophisticated units used in industrial, commercial, or other professional
ecosystem. It is not tailored for the general public. The total rating power is larger than 1 kW and is in
accordance with the IEC61000-3-12 standards. Hence, the short-circuit ratio between the user’s power
supply and the power grid needs to be greater than or equal to 250 interfaces.
• The user needs to obtain permission from the utility power department to ensure that the unit connection
to the power supply with the short-circuit ratio is greater than or equal to 250.
3.1. Task Introduction
3.1.1. Cables to Connect On-site

Table 3-1 tabulates the various copper cables recommended for cabling of indoor and outdoor units with control
panel. Table 3-2 provides a list of the copper cables to be arranged by customer.
Table 3-1 Recommended cables for different models
Name of Items SRC03GES SRC07GES SRC07GET SRC11GET
pipe 1/2” with 5/8” with 5/8” with 7/8” with

Gas (Suction) pipe
insulation insulation insulation insulation
3/8” with 3/8” with 3/8” with 3/8” with
Liquid (Discharge) pipe
insulation insulation insulation insulation
Indoor power cable 3C x 1.5 mm2 3C x 1.5 mm2 3C x 1.5 mm2 3C x 1.5 mm2
Fan control cable 3C x 0.5 mm2 4C x 0.5 mm2 4C x 0.5 mm2 5C x 0.5 mm2
Outdoor power cable* 2C x 2.5 mm2 2C x 2.5 mm2 4C x 2.5 mm2 4C x 2.5 mm2
Fan and contactor 4C x 0.5mm2
Outdoor HP and LP cable 3C x 0.5mm2
Outdoor pressure sensor cable 3C x 0.5mm2
All field cables are recommended as armored cables to avoid external influence such as rat bite etc.

Table 3-2 Required Cables from Customer End
Cable SRC03GES SRC07GES SRC07GET SRC11GET
3C x 4 mm2 5C x 4 mm2
Incoming power cable
(L + N + PE) (3L + N + PE)
Customer in 1 2C x 0.5 mm2
Customer in 2 2C x 0.5 mm2
Remote shut 2C x 0.5 mm2
Fire alarm 2C x 0.5 mm2
Common alarm 2C x 0.5 mm2
Sequencing high 2C x 0.5 mm2
Sequencing low 2C x 0.5 mm2
Communication LAN cable with male connector
3.2. Installation Notes

All power and control cabling and ground connections must be in accordance with the respective national
and local electrical regulations. The power cables should not be lighter than the ordinary PVC sheathed cord
GB5023.1 (idt IEC60277) line 53.
1. The connections of all the power cables, control cables, and ground cables should be in compliance with the
respective local and national electrical regulations.
2. Observe the unit name-plate for the full load current. The cables sizes must meet the conditions as specified
in the respective local cabling protocols and rules.
3. If the power cable connection is damaged, it has to be replaced immediately to eliminate the danger. The
replacement procedure must be carried out by an authorized professional or experienced service personnel.
4. The electrical installation and maintenance must be carried out by some authorized personnel or a trained
engineer well-versed with the inner workings of the electrical connection (for example, a service engineer
from the manufacturer’s side).
5. Prior to the cabling, a voltmeter must be used to measure the power supply voltage and ensure that the power
supply has been switched Off.
6. The front end of the unit needs to be equipped with a power-disconnection device to ensure safe operation.
7. Use screws, guide rails, or other modes to fix the device firmly during the installation process to avoid
movement or shaking during the start-up or operation mode.

3.3. Indoor Unit Connection
No. Description
1 Indoor terminal cover plate
Figure 3-1 Indoor Cable Terminal Location
Refer the following procedure to connect the power supply cables and control cable of unit:
1. Refer Table 3-1 for indoor power cable and fan control cable
2. Open the cover plate and access barrier terminal block (multi-pin connector).
3. Route the power cable through the cover plate wire hole and connect it to the barrier terminal lock, refer
Figure 3-2 for terminal connection.
Figure 3-2 Control Field Connection Terminals for Single Phase

Table 3-3 Indoor Unit Feed Terminal
Model PWM GND FAN FEED 1 FAN FEED 2 FAN FEED 3

SRC03GES Y Y Y NA NA
SRC07GES Y Y Y Y NA
SRC07GET Y Y Y Y NA
SRC11GET Y Y Y Y Y
The Full Load Current (FLA) of the indoor unit is given in Table 3-4.
Table 3-4 Full load current of the indoor + outdoor unit
Model Full Load Current (FLA)

SRC03GES 8A
SRC07GES 20 A
SRC07GET 13 A
SRC11GET 17 A
Cut Off the power supply to the unit prior to the maintenance, because the unit contains high voltage.
• Use copper cables only and ensure that all cables are firmly connected.
• Ensure that the power supply voltage is as per the voltage specified on the unit nameplate.
• Install a MCB switch before the power supply input of the indoor unit to easily isolate the unit for the
maintenance. Connect the power cable to the MCB switch and then to the unit.
• A RCCB should be installed before the indoor unit power supply input.

3.4. Outdoor Unit Connection

Figure 3-3 shows the location of outdoor cable connection terminal. Figure 3-4 and Figure 3-5 show the amplified
connection terminals for SRC07GES and SRC07GET respectively.
No. Description
1 Outdoor terminal block
Figure 3-3 Outdoor Cable Terminal Location
Figure 3-4 Cable Connector Terminals (SRC07GES, SRC03GES)

Figure 3-5 Cable Connector Terminals (SRC07GET, SRC11GET)
Refer Figure 3-4and Figure 3-5 for cable connection between indoor and outdoor units.
3.4.1. Control Panel Connection

Control panel is provided with power connector and control connector (CONN1, CONN2, and CONN3).
Refer following figure for description
Figure 3-6 Cable Connector Terminals
Figure 3-6 shows a generalized picture of terminal connection. Following table shows applicability of pins. During
installation refer sticker pasted on machine for actual connection. Pins other then presented in below table are
applicable for all machines.

Table 3-5 Indoor Unit Feed Terminal
FAN FAN FAN

Model L1:IN L2:IN L3:IN L1: ODU L2: ODU L3: ODU
FEED 1 FEED 2 FEED 3
SRC03GES Y NA NA Y NA NA Y NA NA
SRC07GES Y NA NA Y NA NA Y Y NA
SRC07GET Y Y Y Y Y Y Y Y NA
SRC11GET Y Y Y Y Y Y Y Y Y
• Fire/smoke alarm feed

These pins are provided for connecting inputs from fire and smoke alarm sensor. In case of ‘On alarm’, AC unit
status sets to OFF mode.
• Customer feed
These pins are used to record any customer alert signals and then it can be displayed on LCD screen.
• Remote On/Off
The remote On/Off terminal can be used to remotely control the unit ON/OFF status and to stop the unit
operation upon special moment. If the inputs of remote On/Off terminals are shorted and the AC unit power
supply is switched On, then AC unit outputs are normal.
If the terminal is open, the AC unit will stop giving outputs. The terminals have been shorted before delivery.
If the control cables need to be connected at site, remove the short cables and connect the outer controller to
the remote On/Off terminals respectively.
• The customer terminal (control terminal) can connect with any alarm signal except for the AC system.
• Any outer alarm signal with NO dry contact can be connected with customer terminal. After the outer alarm
signal is connected, user should set the corresponding customer alarm information in microprocessor
controller.
• If no alarm signal is connected, the input state of the customer terminal is the same as that of setting. If an
outer alarm is generated, the input state is different from the setting.
• The AC system will generate an audible alarm and LCD screen on microprocessor controller will display
the corresponding alarm information. If a computer using Vertiv host monitoring software is connected, the
alarm will be displayed on it too.
• Common alarms
The common alarm relay, connected with the terminal block, has a set of Normally Open (NO) dry contact, and
it can also be set to (Normally Closed) NC through software. When a major alarm is generated, the contact is
closed. This can be used to send a remote alarm, sending signals to the Building Management System (BMS) or
dialing the paging system automatically.
• Communication
LAN connection is provided on terminal block for communicating with RDU unit.
Multiple Vertiv™ Liebert® SRC-G can simultaneously monitor multiple units through the Vertiv RDU-A/SIC
monitoring.

Figure 3-7 shows the networking of the two Liebert SRC-G units monitored through the Vertiv RDU-A/
SIC monitoring.
Figure 3-7 Monitoring the Networking of Two Liebert® SRC Units.
• Teamwork/Sequencing connection
Vertiv™ Liebert® SRC-G units support the teamwork control function of up to 8 units. If user needs to use the
teamwork control function, then connect the teamwork control terminals SEQ CH+, SEQ CL+, SEQ CH- and
SEQ CL- between the units in series.
Figure 3-8 Connection Diagram of Teamwork Control Terminal
Refer Figure 3-8 for cabling the units, after the teamwork control unit is cabled, set jumper on CONN 2 connector
in control panel between J33: 1 and J33: 2 for first and last unit and set between J33: 2 and J33: 3 for rest of the
units. The maximum allowed network cable length of 400 m.

3.5. Electrical Installation Checklist

After the system electrical installation is completed, the following requirements should be met.
Table 3-6 Electrical Inspection Checklist
Particulars Results
The system electrical loop has no open-circuit or short-circuit exists in the electrical
connection.
The power supply voltage meets the rated voltage on the nameplate of the unit.
Confirm, if the power cables and ground cables are connected to the breaker switches,
indoor unit, and outdoor unit correctly as per the norms.
The ratings of the MCBs and fuses are correct.
The control cables are configured and subsequently, fixed properly.
All the cables and connector connections, including the fixing blocks, are firmly and
appropriately fixed.
After confirming the preceding points, user can replace the electrical plate and start start-up inspection and
functional testing.

Start-up Commissioning
Chapter 4: Start-up Commissioning

This chapter introduces the start-up inspection and function testing of Vertiv™ Liebert® SRC-G units.
4.1. Start-up Inspection

Before commissioning the unit, inspect the status of components of the unit. Refer Table 4-1 for the list of
inspection requirements.
Table 4-1 Component Inspection Checklist before Commissioning
Components Inspection Requirements

• Check if there are any damage to the top, bottom, side, front and rear panels of the
Panel unit.
• Check if the panels are well insulated and clean.
• Check if there is any damage to the filter, and clogging.
Filter
• Check if the filter is reliably fixed.
• Measure and record the voltage before the system is powered On.
Power supply
• Check if the power cables are firmly connected.
• Check if the outdoor unit is installed properly, the piping are rigidly supported, and
Outdoor unit pipings are sloped down properly.
• Check the trap is installed at an appropriate location.
Fan Check if there is any obstacle at inlet and outlet areas of the fan.
Microprocessor Controller Check if the connection cables are firmly connected.
After inspecting and confirming the above particulates go ahead with commissioning procedure.
Prior to powering On the indoor unit, ensure that the outdoor unit power and signal cables are connected
and the outdoor unit MCB is closed.

The inspection requirements after starting-up are listed in Table 4-2.

Table 4-2 Component Inspection after Starting-up
Components Inspection Requirements
• Check if the rotation direction of the blades is correct.

Fan
• Check and record the rated full load current and actual current of the fan motor.
• Check if the rotation direction of the blades is correct.
Outdoor fan
• Check and record the rated full load current and actual current of the fan motor.
• Check after the compressor is turned On, if the refrigerant (R410A) is dynamically
charged, and check if the condensation and sub-cooling temperature reach to 5 K or
more, while the suction superheat temperature reaches 10 K or more.
Refrigerant charge
amount • Observe the compressor suction line to ensure that the piping and compressor housing
are free of condensation to avoid potential damages caused due to liquid presence.
• Check if the unit exhaust superheat is in the range of 25 °C to 50 °C.
Record user setpoint values, return air temperature, suction pressure, exhaust pressure,
Others
compressor current, and outlet air temperature.
4.2. Function Testing
The lethal voltage may be present in the unit which can be fatal, therefore cut Off the power supply prior to
functional testing. All notes, warnings, and cautions marked on the unit as well as the ones mentioned in the
manual must be considered, otherwise, it may leads to injury and fatality.
Only qualified service and maintenance personnel can perform system operation and maintenance.
4.2.1. Cooling
Adjust the temperature setpoint to 5 °C (10 °F) lower than the indoor temperature. Then the control system
triggers the cooling demand signal and the compressor starts to work. After at least 3mins of cooling, adjust
the temperature setpoint to 5°C (10°F) higher than the indoor temperature. If the compressor stops working, it
means that the cooling function is normal.
Restore the temperature setpoint to the default or the original value after the test.

4.2.2. Dehumidifying
Adjust the humidity setpoint to 10% lower than the indoor relative humidity. Then the control system triggers the
dehumidification demand. Note that during the testing process, if the indoor temperature is 3 ºC higher than the
temperature setpoint, the system may enter in ‘Forced Cooling Mode’ and the dehumidification demand will not
be responded.
Restore the humidity setpoint to the default or the original value after the test.

Controller Operation Instructions
Chapter 5: Controller Operation Instructions

This chapter provides a detailed description on feature, appearance, color screen, control buttons, control
interface and menu structure of Vertiv™ Liebert® SRC-G units.
5.1. Feature
The microprocessor controller has the following features
• It can monitor and display the operation status of Liebert SRC-G unit to maintain the environment within the
range of setpoints.
• Equipped with a 128×64 dot graphics color screen with white back-light with a user-friendly interface.
• Provides a two-level password protection to prevent unauthorized operation.
• Provides multiple functions, including self-recovery upon power failure, high and low voltage protection, phase
loss protection and protection against phase-reversal.
• Accurately record the run-time of important components through menu operation.
• Stores up to 99 historical alarm records.
• Configured with an RS485, using MODBUS-RTU communication protocol.
In case if the customer requires RS485, then remove SIC Card Communication Cable from the Controller.
5.2. Graphic Screen Appearance

The microprocessor controller interface is shown in Figure 5-1. The graphic color screen displays English menus
with white back-light. More detailed operating status of certain component and alarm information are available
from the Main Menu screen. The selected menu option will be highlighted while browsing. The digit to be
changed will be highlighted while scrolling through the settings menu.


1 LCD screen 3 Alarm indicator
2 Run state indicator 6 Control buttons
Figure 5-1 Microprocessor Controller Interface
5.3. Control Interface
5.3.1. Function Buttons
The microprocessor controller has five control buttons, as shown in Figure 5-2. The functions of these control
buttons are described in Table 5-1.

1 On/Off button 4 Up button
2 Enter button 5 Down button
3 ESC button
Figure 5-2 Control Buttons

Table 5-1 Function Descriptions of Control Buttons
Button Function description
On/Off Switch On/Off the controller by pressing for 3s.
Enter button Enter the selected menu screen. Validate the parameter setting value.
Exit the current menu and return to the normal screen or previous menu screen.
Escape button Abort parameter change; silence the audible alarm.
Move the cursor up or increase the parameter value. For a toggle selection: scroll
Up button through the options. For a multi-screen menu: scroll up the screen.
Move the cursor down or decrease the parameter value. For a toggle selection: scroll
Down button through the options. For a multi-screen menu: scroll down the screen.
Operation Example
Example 1: Enter the password to access the Main Menu
After the unit is powered on, user can enter the Main Menu by accessing the following operations on the Normal
screen.
1. Press the Enter button to enter the Password screen.
2. Press the Enter button to highlight the input data field in the Password screen.
3. Press the Up or Down button to change the current password number.
4. Press the Enter button to confirm the password and enter the Main Menu screen.
Example 2: Modify parameters
To set the high temperature alarm of the airflow in the alarm setting menu, perform the following steps:
1. In the Main menu, move the cursor up or down to point it to the Alarm Menu.
2. Press Enter to access the Alarm Menu screen.
3. In the Alarm Menu, move the cursor up or down to point it to the Alarm Settings.
4. Press Enter to access the Alarm Settings screen.
5. In the Alarm Settings screen, move the cursor up or down to point it to the alarm value settings.
6. Press Enter to access the alarm value settings screen.
7. Press the Enter button to highlight the parameter field of Hi Temp of Supply Air.
8. Press the Up or Down button to select the parameter option.
9. After selecting, press the Enter button to confirm. The parameter will take effect.
10. Press the Esc button to return to the previous menu screen.

If user does not press the Enter button to validate the changed parameter after changing the parameter, the
change of Hi Temp to Supply Air is invalid.
5.3.2. Power ON Screen
After the Liebert® SRC-G unit is powered On, the LCD screen will display the ON screen, as shown in Figure 5-3.
Figure 5-3 ON Screen
5.3.3. Summary Screen
After the unit is powered On, the Main Menu screen will be displayed after 10 seconds. Refer Figure 5-4 for better
understanding.

1 Return air temperature 5 Sequencing (teamwork) status
2 Return air humidity 6 Machine working status
3 Current alarm status 7 Unit ID
4 Current date 8 Time
Figure 5-4 Summary Screen

5.3.4. Password Screen
Press the Enter button on the Normal screen and the Password screen will appear, as shown in Figure 5-5.
Figure 5-5 Password Screen
Two levels of menu access are provided to access the menus. The detailed descriptions are given in
Table 5-2.
Table 5-2 Access Level
Access
User Remark
Level
General Browse all menus information. Only set temperature and humidity
Level 1
operator setpoints and cannot be able to changed the values and settings
Factory
Level 2 Browse all menu information. Set all parameters
technician
For detailed operation on entering the password, refer to Section 5.3.1 Operation Example. If incorrect password
is entered in the controller, the menu options can only be viewed, but the parameter settings cannot be changed.
In this case, to return to the Normal screen, you can press the Esc button and then press the Enter button to
again access the Password screen.
If you press the Enter button on the Password screen instead of entering a password, the menu settings can
only be viewed, but no parameters can be changed.

5.3.5. Main Menu Screen
Main Menu screen can be accessed after password screen. The Main Menu screen includes total eight options,
four options are shown in the first half of the screen and for other remaining options scroll the option list down.
Refer Figure 5-6 and Figure 5-7 for better understanding.
Figure 5-6 Main Menu Options 1
Figure 5-7 Main Menu Options 2
In case of sequencing or unit is connected in a network with other units then lowest ID unit is a Host and others
are spares.

The icons and their descriptions are listed in Table 5-3.

Table 5-3 Description of Icons
Icon Description
Alarm Menu This menu presents various option available related to system alarms
Setpoint This menu provides list of setpoints for machine operation
System Status This menu provides status of system parameters
System Menu This menu allows editing of various system parameters
Help Menu This menu provides help menu option
Display Setting This menu provides display setting option
SEQ Status This menu provides sequencing Status of machines connected for teamwork
SEQ Setting This menu allows editing of control parameters in team mode working
5.4. Menu Structure
5.4.1. Alarm Menu and Options
In the Main Menu select ‘Alarm Menu’ to access the alarm menu option as shown in Figure 5-8. In the Alarm Menu
option, user can access Alarm Status option, Alarm History option and Alarm Setting as shown in Figure 5-9.
Figure 5-8 Alarm Menu in Menu Window

Figure 5-9 Options in Alarm Menu
5.4.2. Alarm Status
Select ‘Alarm Status’ to access the current alarm status of the unit as shown in Figure 5-10.
Figure 5-10 Alarm Status Screen
5.4.3. Alarm History
In the Alarm Menu select ‘Alarm History’ to access the alarm history details as shown in Figure 5-11.
Figure 5-11 Alarm History Screen

5.4.4. Alarm Setting
In the Alarm Menu select ‘Alarm Setting’ to access the alarm setting options, user can press up and down buttons
to scroll through all alarm setting option as shown from Figure 5-12.
Figure 5-12 Alarm Setting Options
Following are the available setting types

• Alarms trigger threshold
For example, Parameter “Hi Temp”. This parameter represents temperature above which “high tempera-
ture alarm” will be triggered
• Alarm enable/disable options
For example, parameter “Hi press”. This parameter is available as EN/DIS. “Hi pressure alarm” could be
enabled or disabled using this parameter.
• Control pin status (for client) in case alarm is triggered
For example, “General alarm”. In case of common alarm case, the pin status during alarm is defined in
this parameter. This status could be NO/NC.
• Miscellaneous
For example, “Clear alarm history” which clears alarm history.

5.5. Setpoint Menu

In the Main Menu option, select ‘Setpoint Menu’ option to access the setpoint setting details of the unit as shown
in Figure 5-13.
Figure 5-13 Setpoint Option
5.6. System Status Menu

In the Main Menu option, select ‘System Status Menu’ option to access the system status details of the unit and
scroll down for On/off Record as shown in Figure 5-14.
Figure 5-14 System Status Options
5.6.1. Analog Status Options
In the System Menu option, select ‘Analog Setting’ option to access the following setting option shown in
Figure 5-15.

Figure 5-15 Return Temperature Setting Screen
5.6.2. Input/Output Status Options
In the System Menu option, select ‘I/O Status’ option to access the following status options as shown in
Figure 5-16.
Figure 5-16 I/O Status Options
5.6.3. Time/Date Options
In the System Menu option, select ‘Time/date’ option to access the following setting option shown in
Figure 5-17.
Figure 5-17 Time/Date Screen

5.6.4. Run Time Options
In the System Menu option, select ‘Run Time’ option to access Evaporate Fan, Compressor and Fan run time the
following setting option shown in Figure 5-18.
Figure 5-18 Run Time Screen
5.6.5. On/Off Record Options
In the System Status menu option, select ‘On/OFF Record’ option to access Evaporate, Fan Compressor and Fan
run time the following setting option shown in Figure 5-19.
Figure 5-19 On/Off Record Screen
Further click on the individual option to access evaporator fan and Compressor Settings and shown in
Figure 5-20.

Figure 5-20 Evap Fan and Compressor Screen
5.7. System Menu

In the Main Menu select ‘System Menu’ to access System Setup, Outdoor unit, Optional Func. and Set Password
options of the unit as shown in Figure 5-21.
Figure 5-21 System Menu Option
5.7.1. System Setup Options
In the System Menu option, select ‘System Setup’ option to access the following setting option shown from
Figure 5-22.
Following are options available in system setup sub-menu

• Communication setting parameters such as Protocol, Unit addr, Baud rate.
• Supply power monitoring parameters such as over-voltage, under voltage frequency offset and Pwr frequency.
• To safeguard compressor and fan during normal operation, Operation delay parameters such as EvapFanStart,
EvapFanStop, Cp minOn, Cp minOff, cold Start defines various.

• EC Dehum parameter to control fan speed for dehumidification.

• Min EC O/P and Max EC O/P are for minimum and maximum fan speed options, in case of variable fan speed is
selected.
• MachSEL parameter oprion for selection of Unit model for operation.
• DTA setup parameter for temperature difference below which DTA alarm is triggered.
Figure 5-22 Protocol Setup Screen
5.7.2. Outdoor Unit Options
In the System Menu option, select ‘Outdoor Unit’ option to access the outdoor unit option shown in
Figure 5-23.
Figure 5-23 Pressure Setting Screen

5.7.3. Optional Function Options
In the System Menu option, select ‘set password’ option to access the following setting option shown in
Figure 5-24. “Silent mode cooling” and “Silent mode dehumidification” allow access to fan speed at which
evaporator fan operates during silent mode of operation.
Figure 5-24 Silent Mode Setting Screen
5.7.4. Set Password Options
In the System Menu option, select ‘set password’ option to access the following setting option shown in
Figure 5-25. Refer Section 5.3.4 for example of password access.
Figure 5-25 Password Setting Screen
The default passwords are factory set for more details contact Vertiv local representative.

5.8. Help Menu

In the main menu select ‘Help Menu’ option to view detail of the unit as shown from Figure 5-26 to Figure 5-28
Figure 5-26 Version Info Screen
Figure 5-27 Controller Info Screen
Figure 5-28 Contact Info Screen

5.9. Display Settings

In the Main Menu select ‘Display Menu’ option to access display and Language settings option as shown in
Figure 5-29.
Figure 5-29 Display Settings Screen
5.10. Sequencing Status

In the Main Menu select ‘Sequencing Status’ to access the sequencing details as shown from Figure 5-30.
Figure 5-30 Sequencing Status Screen

5.11. Sequencing Setting

In the Main Menu select ‘Sequencing Setting’ option to access sequencing setting details as shown from
Figure 5-31.
Figure 5-31 Sequencing Setting Screen
Sequencing/TeamWork option
Liebert® SRC units have teamwork function, which allow multiple units (maximum 8) to connect in a network.
This feature is applicable in following operation modes.
• Scheduling
In this mode, some of the units in network can be set off as a standby and rest of the units regulate temperature
and humidity of the room. Once rotation time is over, next set of units start operation, and previously operating
units switch to rest.
• Contingency
In this mode, if there is an alarm in the operating unit then standby unit takes over automatically and faulty unit is
set out of operation for maintenance. Once the faulty is removed, it can set back to operation based on schedule.
• Cascading
In this mode, if rise in the steep temperature is detect, all units start operating together, to control tem-
perature as per the setpoints.
Sequencing mode
All units in the network should be connected as given in Chapter 3, Connection Section 3.4.1.
To establish the network, all units are designated with independent Unit ID starting from 0 to 7. Unit with ID ‘0’
is assigned as a master and rest of the units are slave. In case of fault with master unit, next lowest ID unit is
promoted as a master. Once the unit is out of fault it can again resume as a master.
Total Mach
This option represents total units in the network.

Work Mach
This option represents total number of working units in the batch. Rest of the units are considered as standby.
Rotate Mn and Reset Run Mn
Scheduling is achieved by setting rotation min using parameter “Rotate Mn”. This parameter is factory set using
“Reset Run Mn”.
Cas Mode
Cas Mode is selected by “ON”. Cascading mode is activated when Cas Temp is reached. This mode is auto turned
Off when once Cas Diff is achieve.
STBY BLWR
The status of evaporator fans of standby units can be selected using “STBY BLWR”.

System Operation and Maintenance
Chapter 6: System Operation and Maintenance

This chapter explains the system maintenance of Vertiv™ Liebert® SRC-G units, including electrical inspection,
indoor unit maintenance, outdoor unit maintenance and maintenance inspection checklist.
• Switch Off the circuit breaker and cut-off the unit power supply before maintenance unless the power is
necessary for commissioning the unit.
• Prior to operation and maintenance, the lethal voltage may be present in the unit which can be fatal. All
notes, warnings, and cautions marked on the unit as well as the ones mentioned in the manual must be
considered, otherwise, it may lead to injury and fatality.
6.1. Electrical Inspection

Visually inspect the control board, power detection board, outdoor fan speed controller board, display panel,
temperature and humidity sensor, infrared humidification leak detection board on a semi-annual basis for any
loose electrical connection and circuit corrosion.
The microprocessor controller has six circuit boards, which jointly complete the system fault diagnosis process.
Inspect the boards one by one according to the procedures below:
1. Conduct overall electrical insulation test: Find out the unqualified contacts and handle them carefully.
2. Statically check and test the contactors before power On and ensure that contactors can act freely without
any obstruction.
3. Clean the electrical and control components with a brush or compressed dry air.
4. Check the end of contactors for arcs or signs of burning. Replace the contactor if necessary.
5. Fasten all the electrical connection terminals.
6. Check if the temperature of all MCBs and contactor terminals become higher.
• All circuit boards are not hot-pluggable. Big instant current will be produced when the board is plugged or
unplugged with powering On and it may lead to unrepairable damage to the circuit.
• All control boards can only be maintained after the micro-processing controller is powered Off.

6.2. Indoor Unit Maintenance
6.2.1. Filter
The filter is a consumable components and Its replacement interval is directly related to the seal and cleanness
status of the equipment room. In order to maintain efficient operation, the filter should be checked monthly and
be replaced or washed if it is damaged or clogged.
No. Description No Description

1 Removal Bracket 3 Removal Bracket
2 Filter
Figure 6-1 Liebert® SRC-G Filter
6.2.2. Fan
The monthly inspection particulars of the fan kit include: fan status, fan kit fixation, and clearance between fan
impeller and inlet nozzle. Inspect the motor bearings and impeller monthly; and replace it if any damaged found
in impeller. Check the impeller is tightly mounted on the rotor of the motor and does not obstruct against its
neighboring metal components during rotation.
Since the fan kit operates 24hours every day continuously, any unusual airflow obstruction must be cleared in
time to avoid the damage to the cooling system. This unusual airflow obstruction can also affect to the other
system components due to reduction in air volume. Refer Figure 6-2 for better understanding.


1 Fan Box 3 EC Fan
2 Front Panel
Figure 6-2 Vertiv™ Liebert® SRC-G EC Fan Location
6.2.3. Drain Pipe
Figure 6-3 shows drain pipe connection; inspect water pan periodically for normal operation of the drain pipe.
Ensure that no foreign matter or leakage exists in the drain pipe.

1 Drain connection 2 Cover plate
Figure 6-3 Liebert® SRC-G Drain Pipe Connection

6.2.4. Thermal Expansion Valve (TXV)
The Thermal Expansion Valve keeps the evaporator supplied with enough refrigerant to satisfy load conditions.
Its proper operation can be determined by measuring the superheat level. The correct superheat setting is
5.6 °C to 8.3 °C (10 °F to 15 °F).

6.3. Outdoor Unit Maintenance
6.3.1. Refrigeration System
The components of the refrigerant system should be inspected monthly to find out any abnormal operation
phenomenon. Refrigerant piping must be properly fixed and not allowed to vibrate against wall, floor or the unit
frame. Inspect all refrigerant piping every six months for signs of wear.
6.3.2. Air-cooled Condenser

• When the airflow through the outdoor unit is restricted or blocked, use compressed air or fin cleaner
(alkalescence) to clean the condenser off the dust and debris that reduce airflow.
• The compressed air should be blown at the reversed airflow direction. In winter, do not let snow to accumulate
around the side or underneath the condenser.
• Check for bent or damaged fins and simply repair them if necessary.
• Check all refrigerant pipes and capillaries for vibration and support them if necessary.
• Carefully inspect all refrigerant piping for signs of oil leakage, determine the leakage position and fixed them
immediately.
6.3.3. High-Pressure Switch and Low-Pressure Switch
The discharge and suction pressures will vary greatly with the unit load, ambient condition and used refrigerant,
refer Table 6-1 for details of normal operation. When the discharge pressure rises to the high-pressure setpoint,
the high-pressure switch gets activated and the control system shuts down the compressor after ensuring that
an abnormal input signal of the high-pressure switch is triggered.
When the suction pressure is lower than the low-pressure setting, the low-pressure switch gets activated and the
control system shuts down the cooling system after confirmation.
Table 6-1 Typical Liquid (Discharge) Pressure and Gas (Suction) Pressure
Items psig MPa
Low pressure 100 to 159 0.7 to 1.12
Low-pressure setting 53 0.37
Low-pressure recovery point 80 0.56
High pressure 284 to 526 2.0 to 3.7
High-pressure setting 583 4.1
High-pressure recovery point 469 3.3

6.3.4. Compressor
The compressor fault is generally classified into two types:
1. Motor failure (such as winding burnout, insulation failure, short-circuit between coils and so on)
2. Mechanical failure (such as compressing failure, relief valve fault, therm-o-disc fault and so on)

1 Outdoor cover plate 2 Location of the compressor
Figure 6-4 Location of Compressor
If the sufficient operating pressure is not established, it is an indication of the compressor has failed. It can be
confirmed - if the suction pressure and discharge pressure are balanced, and the motor does not rotate reversely.
The controller of the unit has a powerful alarm and protection functions to ensure safe operation of the
compressor. The maintenance personnel should record the high pressure and the low pressure, and find out the
cause of an alarm protection during periodical maintenance and inspection.
Avoid touching or contacting the residual gas and oils in compressor with exposed skin. Wear long rubber
gloves to handle contaminated components.
Check the following particulars before replacing the compressor

1. Check that all fuses and circuit breakers are normal
2. Check the working status of the high and low pressure switches
3. Check the relative historical alarm information
4. Check the compressor operation record
5. Check the motor electrical characteristic
System contains refrigerant. Recover refrigerant using standard recovery equipment before maintenance.
Refer the following procedure to remove and replace the failed compressor
1. Cut off the power supply
2. Attach suction and discharge gauges to compressor access fitting
3. Recover the residual refrigerant by using standard recovery procedures
4. Remove the failed compressor
5. Follow manufacturer’s instructions to clean out piping kit
6. Install replaced compressor and make all connections, perform pressurization, and leakage tests of the system
at approximately 150 psig (1034 kPa)
7. Evacuate the system twice to 1500 microns and the third time to 500 microns. Break the vacuum each time
with clean and dry refrigerant to 2 psig (13.8 kPa)
8. Charge the system with refrigerant based on the requirements of the evaporator, condenser and piping
9. Apply power and operate the AC unit. To check the proper operation, refer the circulation suction pressure
and discharge pressure are in normal operation ranges, and if necessary add some more refrigerant
Release of refrigerant to the atmosphere is harmful to the environment. Refrigerant must be recycled in
accordance with state and local regulations.

6.4. Monthly Routine Maintenance

Check the components of the system monthly, focusing on whether the system function is normal and whether
the parts are showing signs of wear. Refer Table 6-2 for monthly routine maintenance inspection items.
To ensure proper operation of the equipment, routine maintenance checks must be performed on a regular
basis.
Table 6-2 Routine Maintenance Checklist (Monthly)
Component Inspection Particulars Remark
Check for clogging or damage
Filter Check the filter clogging switch
Clean the filter
Indoor unit fan Impellers free of debris and distortion, and move freely
Check for any signs of oil leaks

Compressor
Listen to running sounds and observe operation vibrations
Check and clean out unit drain piping; humidifier and water pan;
Drain system
condensate pump and building drain piping.
Check if refrigerant piping is reliably supported
Check system circulation and moisture content (observed through sight
Refrigerant system
glass)
Check Thermal Expansion Valve (TXV) is firmly connected

6.5. Routine Maintenance and Inspection (Semi-annually)

Table 6-3 for the semi-annual routine maintenance inspection items.
Table 6-3 Routine Maintenance Checklist (Semi-annually)
Components Inspection Particular Remark
Check for any signs of oil leaks

Compressor
Listen to running sounds and observe operation vibrations
Check suction pressure, exhaust pressure and suction superheat are as per
setpoints
Check if the evaporator is functioning normally
Check system circulation and moisture content (observed through sight)

Refrigeration
cycle system Check whether there is an obvious temperature difference before and after
drying the filter
Check Thermal Expansion Valve (TXV) is firmly connected
Check the refrigerant piping. The refrigerant line must have a suitable bracket
and must not be placed against the wall, floor or fixed frame
Check if the condenser coil is clogged, clean immediately if it is blocked
Check if the motor is firmly mounted

Air-cooled
condenser Check if there is any distortions in impeller rotation, also check bearings if they
are in good condition
Check if the refrigerant piping are properly supported
Check all electrical connections are firmly tightened

Electrical board
Check the surface of the circuit board for signs of corrosion

Troubleshooting
Chapter 7: Troubleshooting
Troubleshooting is to be performed by the trained and qualified service personnel. However, the checklists have
been provided just for reference purpose.
• Certain circuits carry lethal voltages. Only professional technicians are allowed to maintain the unit.
Extreme care and caution is required while troubleshooting the unit online.
• If jumpers are used for troubleshooting, remember to remove the jumpers after the troubleshooting, if not
removed the connected jumpers may bypass certain control functions and increase the risk to the unit.
Table 7-1 represents the troubleshooting of the indoor unit of Liebert® SRC-G units.
Table 7-1 Troubleshooting of the Indoor Unit
Symptom Possible Cause User Needs to Check Particulars or Processing Method
No power supply to the unit Check unit input voltage
The unit does not Circuit breaker of controller voltage

Locate short circuit and reset circuit breaker
start is open
Low power supply voltage Check for power supply volatge at SPD (if available)
Compressor contactor not engaging Check for 220 Vdc of coil. If the voltage is right, check if
(not connecting) in the contactor is connected properly
High compressor discharge See if there is “High pressure alarm” and follow the
pressure maintenance descriptions
No cooling
Check if strainer is clogged or damaged, if it is then clean
Plugged strainer
or replace the strainer accordingly
Use suction and discharge pressure gauge to check

Low refrigerant charge if pressure is as per requirement. Also, see if there any
evident of bubbles exists in the sight glass
Static discharge Disconnect the system power supply, and then restart
Display abnormal
Loose connection between keypad Check the connections are firmly fixed after powering Off,
and control board the unit and then restart the unit

Troubleshooting
No display, control
buttons do not Disconnection between keypad and Check if the connections between keypad and control
respond, and unit control board board are firmly connected
operates normally
The screen display

is normal, the
Contact Vertiv representative for maintenance support or
button does not The display board setting is faulty
engineering assistance
respond, the device
is running normally
No display, control Low power supply voltage Check for power supply voltage
buttons do not
respond and unit
has no output Communication between control Check if the connections between control board and
board and control board interrupted control board are firmly connected
Remove debris from coil and airflow inlet, and

Insufficient airflow across condenser
check the fan speed function of the control board
Check that the connections of the control board to the

outdoor unit terminals are firmly connected, and
Condenser fan is not operating
High pressure check that the condensate pressure sensor works
alarm normally
Check the connection of the high-pressure switch and the

on-off condition when the power is turned Off. If necessary,
High pressure switch failure
replace it with the high-pressure switch of the same
specification
Check for leaking point and fix it immediately and then

Refrigerant leakage
re-charge the system with adequate amount of refrigerant
Outdoor ambient temperature is too Contact Vertiv representative for maintenance support or
Low pressure alarm
low engineering assistance
Outdoor unit fan running at full

Check if the outdoor unit cabling is correct; and check
speed upon low outdoor ambient
whether the condensate pressure sensor works normally
temperature

Troubleshooting
High temperature setpoint is

Reset the setpoint
unreasonable
High temperature
alarm
Room load exceeding unit design
Check for room sealing or make capacity expansion
ability
Low temperature Low temperature setpoint is

Reset the setpoint
alarm unreasonable
High humidity setpoint is

Reset the setpoint
unreasonable
High humidity
alarm
Vapor barrier is not done in the
Check for the vapor barrier
room
Low humidity alarm Setpoint is unreasonable Reset the setpoint
Remote shutdown Remote control shutdown Adjust remote control parameters
Remove the obstruction at the return air outlet of the unit,

Airflow loss alarm Return air volume is small clean the return air filter, or contact Vertiv representative
for maintenance support or engineering assistance
Return air
temperature sensor
fault alarm
Return air humidity Return air temperature and humidity

Replace the return air temperature and humidity sensor
sensor fault alarm sensor failure
Airflow loss sensor

failure alarm
Check if the condensing pressure sensor cabling is

Pressure sensor
Pressure sensor failure firmly connected or contact Vertiv representative for
failure
maintenance support or engineering assistance

Troubleshooting
The unit is in operation and the

Power loss alarm Check if the power input line is in good condition
power is lost and then restored
Power supply over- Power supply voltage deviates from

Check if the power input line voltage is in good condition
voltage alarm set value
Power supply
Power supply voltage deviates from
under-voltage Check if the power input line voltage is in good condition
set value
alarm
Power supply Power supply frequency deviates Check if the power input line frequency is in good
frequency offset from set value condition
Power supply phase

Power supply phase loss Check if the power input line cabling are in good condition
loss alarm
Power supply
reverse phase Power supply reverse phase rotation Check if the power input line cabling are in good condition
rotation alarm
Controller not
Check fuse on transformer Replace fuse with new fuse (3 Amps fast blow)
starting

Appendix I: Menu Structure

HOME SCREEN
PASSWORD
SCREEN
SYSTEM DESPLAY SEQUENCING SEQENCING

ALARM MENU SET POINTS SYSTEM MENU HELP MENU
STATUS SETTING STATUS SETTING
i
ANALOG ON/OFF
ALARM STATUS TEMP SET I/O STATUS TIME/DATE RUN TIME SYSTEM SETUP VERSION INFO CONTRAST MACH STATUS TEAM WORK
RECORD
ALARM RTN TEMP COMPRESSOR YEAR EN

TEMP BAND EVAP FAN EVAP FAN OUTDOOR UNIT LANGUAGE RUN HR SEQ MODE
HISTORY ACTIVATION
ALARM RTN HUM MONTH OPTIONAL

HUM SET COND FAN COMPRESSOR COMPRESSOR RUN MN UNIT ID
SETTING FUNCTION
SUPP TEMP GENERAL DAY SET

HUM BAND COND FAN SYS ON MN CAS MODE
ALARM PASSWARD
TEMP CAL HR, MIN TOTAL

EC OUT MACHINE
HUM CAL WORKING

HI PRESS MACHINE
RET CAL CASCADING

LOW PRESS MACHINE
SUPP CAL CASACDING

CUSTOM 1 TEMPERATRE
PRESS1 CASCADING
CUSTOM 2 DIFFERENTIAL
PHASE A ROTATE MN
PHASE B RESET RUN MN
PHASE C STBY BLOWER
PWR FREQ

© 2023 Vertiv Group Corp. All rights reserved. Vertiv™ and the Vertiv logo are trademarks or registered trademarks of Vertiv Group Corp. All other names
and logos referred to are trade names, trademarks or registered trademarks of their respective owners. While every precaution has been taken to ensure
accuracy and completeness here, Vertiv Group Corp. assumes no responsibility, and disclaims all liability, for damages resulting from use of this information
or for any errors or omissions.
UM-ASIA-EN-SRCG-V2-23-06

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Liebert® SRC-G

Precision Air Conditioning

Vertiv Co., Ltd.

Styling used in this Guide

1.1.1. Indoor Unit.......................................................................................................................................................................................................................1

1.1.2. Outdoor Unit...............................................................................................................................................................................................................2

1.1.3. Control Panel..............................................................................................................................................................................................................2

1.2. Model Description..............................................................................................................................................................................................................3

1.3. Basic Performance Parameters..............................................................................................................................................................................4

1.4. Main Components..............................................................................................................................................................................................................4

1.4.1. Indoor Unit....................................................................................................................................................................................................................4

1.4.2. Outdoor Unit..............................................................................................................................................................................................................6

1.4.3. Control Panel............................................................................................................................................................................................................. 7

1.5. Additional Components (Optional)....................................................................................................................................................................8

1.5.1. Remote Monitoring...............................................................................................................................................................................................8

1.5.2. Installation Accessories..................................................................................................................................................................................8

1.6. Environmental Conditions Requirements....................................................................................................................................................9

1.6.1. Operating Environment Requirements.............................................................................................................................................9

1.6.2. Storage Environment Requirements..................................................................................................................................................9

1.7. Refrigerant Charging Requirement.................................................................................................................................................................10

Chapter 2: Mechanical Installation................................................................................................................................. 12

2.2. Installation Notes..............................................................................................................................................................................................................13

2.3. System Installation Arrangement.................................................................................................................................................................... 14

2.3.1. System Arrangement during Installation..................................................................................................................................... 14

2.3.2. System Installation Mode...........................................................................................................................................................................15

Vertiv™ Liebert® SRC-G User Manual i

2.4.1. Dimension and Weight of the Indoor Unit (Product Dimension)..........................................................................17

2.5. Dimension and Weight of the Outdoor Unit............................................................................................................................................19

2.6. Indoor Unit Installation Procedure................................................................................................................................................................. 20

2.6.1. Equipment Room Requirements........................................................................................................................................................ 20

2.6.2. Installation Space Requirements...................................................................................................................................................... 20

2.6.3. Indoor Unit Installation..................................................................................................................................................................................21

2.7. Installation of Outdoor Unit....................................................................................................................................................................................25

2.7.1. Installation Notes.................................................................................................................................................................................................25

2.7.2. Holes Dimension of the Outdoor Unit Base.............................................................................................................................25

2.8. Refrigeration Piping Connection General Principles.................................................................................................................... 27

2.8.1. Quick Thread Connector Installation Notes.............................................................................................................................28

2.8.2. Piping Connection Requirements.....................................................................................................................................................28

2.8.3. Connecting Refrigerant Piping............................................................................................................................................................29

2.8.4. Pipe Connector Position.............................................................................................................................................................................29

2.8.5. Connecting Drain Piping Of Indoor Unit......................................................................................................................................31

2.9. Installation of Display Screen................................................................................................................................................................................31

2.10. Charging Refrigerant.................................................................................................................................................................................................32

2.10.1. Base Charging of Refrigerant...............................................................................................................................................................32

2.10.2. Adding Refrigerant for Long Piping System.........................................................................................................................33

2.10.3. Long Connecting Pipe System with Lubricant Oil..........................................................................................................33

2.11. Mechanical Installation Checklist...................................................................................................................................................................34

Chapter 3: Electrical Installation..................................................................................................................................... 35

3.1.1. Cables to Connect On-site..........................................................................................................................................................................35

Vertiv™ Liebert® SRC-G User Manual ii

3.2. Installation Notes.............................................................................................................................................................................................................36

3.3. Indoor Unit Connection.............................................................................................................................................................................................37

3.4. Outdoor Unit Connection........................................................................................................................................................................................39

3.4.1. Control Panel Connection.........................................................................................................................................................................40

3.5. Electrical Installation Checklist......................................................................................................................................................................... 43

Chapter 4: Start-up Commissioning............................................................................................................................44

4.2. Function Testing............................................................................................................................................................................................................. 45

Chapter 5: Controller Operation Instructions................................................................................................... 47

5.2. Graphic Screen Appearance.................................................................................................................................................................................47