Gree R410a r32 Folyadekhuto SM jf00304157

Change for life
Service Manual
A series modular air-cooled chiller (heat pump)
T1/ R410A /50Hz

T1/ R32 /50Hz
Contents
1 Product information.........................................................................................3
1.1 Introduction..............................................................................................3
1.1.1 Lineup..............................................................................................3
1.1.2 Nomenclature...................................................................................3
1.1.3 Product features...............................................................................4
1.1.4 Nominal operating conditions...........................................................4
1.1.5 Operation range...............................................................................5
1.2 Performance correction curves................................................................5
1.3 Working principle.....................................................................................6
1.4 Technical parameters.............................................................................10
1.4.1 Electrical parameters.....................................................................10
1.4.2 Performance parameters...............................................................11
1.4.3 Scope of supply.............................................................................13
2 Unit control....................................................................................................15
2.1 Schematic diagram................................................................................15
2.2 Operation flowchart................................................................................17
2.2.1 Cooling...........................................................................................17
2.2.2 Heating..........................................................................................18
2.3 Key control logics...................................................................................19
2.3.1 Cooling control...............................................................................19
2.3.2 Heating control...............................................................................19
2.3.3 Control to the compressor..............................................................20
2.3.4 Control to the fan...........................................................................20
2.3.5 Control to the 4–way valve.............................................................20
2.3.6 Control to the water pump..............................................................20
2.3.7 Control to the electric expansion valve...........................................20
2.3.8 Protection.......................................................................................20
2.4 Introduction to controller........................................................................21
2.5 Smart management system...................................................................21
2.5.1 Long-distance monitoring/BMS interface.......................................21
2.5.2 Network of the long-distance monitoring system............................21
2.5.3 Hardware.......................................................................................22
2.5.4 Model selection instructions...........................................................23
3 Unit installation.............................................................................................26
3.1 Installation flowchart..............................................................................26
3.2 Preparations before installation.............................................................27
3.2.1 Precautions for installation.............................................................27
3.2.2 Importance of installation...............................................................28
3.3 Installation instructions..........................................................................29
3.3.1 Outline dimensions........................................................................29
3.3.2 Precautions for installation.............................................................33
3.3.3 Installation environment.................................................................33
3.3.4 Installation and service space........................................................33
3.3.5 Installation foundation....................................................................34
3.3.6 Handling and lifting........................................................................34
3.3.7 Placement of the main unit.............................................................35
3.4 Piping and insulation..............................................................................35
3.4.1 Installation of the water system......................................................35
3.4.2 Requirements on piping.................................................................37
3.4.3 Installation of the expansion tank...................................................39
3.4.4 Installation of condensate pipes.....................................................40
3.5 Electrical connection..............................................................................42
3.5.1 Safety precautions.........................................................................42
3.5.2 External connection.......................................................................42
3.5.3 Specification of power supply.........................................................47
3.5.4 Wiring of the electric control cabinet..............................................47
3.5.5 Field wiring.....................................................................................49
3.5.6 Networking and wiring between units.............................................51
3.5.7 Electric wiring digram.....................................................................54
3.5.8 Jumpers.........................................................................................61
4 Test operation, troubleshooting and maintenance ........................................63
4.1 Commissioning......................................................................................63
4.1.1 Flowchart of commissioning...........................................................63
4.1.2 Safety precautions for commissioning............................................63
4.1.3 Preparation before commissioning.................................................63
4.1.4 Check before commissioning.........................................................63
4.1.5 Check for initial run........................................................................64
4.2 Troubleshooting.....................................................................................66
4.2.1 Diagnostics....................................................................................66
4.2.2 Flow chart of troubleshooting.........................................................68
4.3 Power distribution..................................................................................74
4.3.1 Power distribution logic..................................................................74
4.3.2 Introduction to main electric elements............................................74
4.3.3 Main board.....................................................................................75
4.4 Replacement of main parts....................................................................77
4.4.1 Brief introduction............................................................................77
4.4.2 Replacement instructions...............................................................78
4.5 Routine maintenance.............................................................................99
4.5.1 Repairs to refrigerant leakage........................................................99
4.5.2 Air removal...................................................................................100
4.6 Exploded views and part lists...............................................................101
4.7 Maintenance........................................................................................113
4.7.1 Requirements for maintenance....................................................113
4.7.2 Freeze protection in winter...........................................................115
Product
Product
1
Product
SAFETY NOTICE
The following symbols are used in this document to alert the reader to potential of hazard.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in damage
to the machine as well as death or serious injury.
CAUTION identifies a hazard which could lead to minimal or moderate damage to the machine as
well as death or serious injury.
BAN indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
COMPLIANCE identifies a hazard which could lead death or serious injury as well as damage to the
property.
PREFACE
Thank you for selecting Gree’s A Series Inverter Modular Air-cooled Chiller (Heat Pump). Please read
this instruction manual carefully before installing and using the product, we hereby instruct as below:
This Manual is applied to A Series Inverter Modular Air-cooled Chiller (Heat Pump), specifying
operation safety requirements, basic principles and implementation approaches for construction fulfillment,
construction debug, after-sale maintenance and repairs. All works must be performed in accordance with
the relevant national (and local) safety requirements and User's Manual, which if not abided, could result
in potential damage to the air conditioner, and even serious injury or death.
2
Product
1 Product information
1.1 Introduction
1.1.1 Lineup
Cooling Heating
capacity capacity Power
Model Refrigerant Appearance
supply
kW kW
LSQWRF35VM/NaA-M 32 36
LSQWRF60VM/NaA-M 60 65 R410A
LSQWRF65VM/NaA-M 65 70
LSQWRF35VM/NhA-M 32 35
LSQWRF60VM/NhA-M 60 65 380–415VAC
3Ph 50Hz
R32
LSQWRF130VM/NhA-M 130 137
1.1.2 Nomenclature
LS QW R F 60 V M / Na A - M
1 2 3 4 5 6 7 8 9 10
No. Code description Options
1 Unit LS: chiller
2 Compressor type QW: hermetic scroll/rotary type
Omit: cooling only
3 Unit function
R: heat pump
4 Cooling method of condenser F: air-cooled
5 Rated cooling capacity Rated cooling capacity = number (kW)
Omit: fixed frequency, V: variable
6 System type
frequency
7 Assembly method M: modular
8 Refrigerant type Na: R410A, Nh: R32
9 Design code A-Z alphabetic order
10 Power code M: 380–415VAC 3Ph 50Hz
For instance, LSQWRF60VM/NaA-M indicates an inverter modular air-cooled chiller with a fully
enclosed rotor-type compressor, featuring 60kW cooling capacity and using R410A refrigerant.
LSQWRF35VM/NhA-M indicates an inverter modular air-cooled chiller with a fully enclosed rotor-type
compressor, featuring 35kW cooling capacity and using R32 refrigerant.
3
Product
1.1.3 Product features

The all-inverter modular air-cooled chillers work outstandingly by virtue of their major features stated
below.
(1) Excellent compatibility
The modular air-cooled chillers can be constructed of multiple single units with the same or different
structure or capability (35kW, 60kW, 65kW, 130kW). For the 35kW unit, it has only one cooling system; for
the 60kW, 65kW units, they are of two independent systems; for the 130 kW unit, there are four uniform
independent systems. Up to 16 single units can be modularized, with cooling capacity ranging from 35kW
to 1040kW.
(2) Comfort and energy saving
The inverter can quickly respond to load change and lead to decreased water temperature fluctuation
and better comfort.
(3) Ultra quiet operation
The high-efficiency and low-noise fan blades and motor as well as the optimized air passage can
greatly lower operation noise of the unit. Besides, the quite mode can provide the user a ultra-quiet
environment.
(4) Powerful self-protection
It is equipped with the top-end microcomputer control system which is capable of providing well-
rounded protection and self-diagnosis.
(5) High reliability
It is constructed of well-designed refrigeration parts and well-designed system, structure and electric
control, adequately guaranteeing reliable operation.
(6) Remote ON/OFF
The unit can be started or stopped by the ON/OFF key operation.
(7) Equilibrium running
It indicates each compressor will run alternately so as to extend their service life.
(8) Shiftwork of water pumps
Two water pumps can work alternately with equilibrium runtime so as to extend their service life and
lower the maintenance difficulty.
1.1.4 Nominal operating conditions
Water side Air side
Item Water flow Dry bulb Wet bulb
Outlet temperature (°C)
m3/(h·kW) temperature (°C) temperature (°C)
Cooling 7 35 -
0.172
Heat pump 45 7 6
4
Product
1.1.5 Operation range

The unit should work within the specified operation range as shown in the table below:
Water side Air side
Item Leaving water Water temperature Ambient DB
temperature (°C) difference (°C) temperature (°C)
Cooling 5~20 2.5~6 -15~52
Heating 35~50 2.5~6 -20~40
Maximum and minimum entering water pressures

Item Minimum entering water pressure Maximum entering water pressure
Cooling
0.06MPa 1.6MPa
Heating
1.2 Performance correction curves
Here are curves indicating the unit performances in cooling and heating states.
LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M

Cooling Heating
Ambient temperature (°C)

Capacity (kW)
Capacity (kW)
Leaving water temperature (°C) Leaving water temperature (°C)
LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M

Cooling Heating

Capacity (kW)
Capacity (kW)
Leaving water temperature (°C)

Leaving water temperature (°C)
5
Product
LSQWRF65VM/NaA-M LSQWRF65VM/NaA-M
Cooling Heating

Capacity (kW)
Capacity (kW)
LSQWRF130VM/NhA-M LSQWRF130VM/NhA-M
Cooling Heating
Ambient temperature (°C )

Capacity (kW)
Capacity (kW)
1.3 Working principle

Here are diagrams below to present the constituents and refrigerant flow of the system.
◆◆ R410A: LSQWRF35VM/NaA-M
COOLING
HEATING
Finned heat exchanger

4-way valve
Electric expansion valve

Compressor
Vapor-liquid separator
Shell-and-tube heat exchanger
6
Finned heat exchanger COOL
Stop valve Defrosting
temp. sensor HEAT
4-way valve
Ambient High-pressure switch

temp. sensor
◆◆ R32: LSQWRF35VM/NhA-M
High pressure sensor

Discharge temp.sensor
Compressor

Low-pressure switch for heating
7
Suction
Stop valve temp. sensor
Product
Low-pressure switch for cooling
Shell-and-tube
outlet temp. sensor
Shell-an d-t ube heat exchanger
Water flow
Shell-and-tube switch
inlet temp. sensor
Entering water Freeze protection Leaving water Vapor-l iquid separator
temp. sensor temp. sensor
temp.s ensor
Solenoid valve Capillary tube
Safety valve
COOL
HEAT
Safety valve Safety valve

Capillary tube Solenoid valve Solenoid valve Capillary tube
Fan Fan
Finned heat exchanger Defrosting Defrosting Finned heat exchanger
temp. sensor Stop valve temp. sensor
4-way valve
High-pressure switch High-pressure switch
4-way valve
Ambient temp. sensor
High-pressure sensor High-pressure sensor
8
Discharge temp. sensor Discharge temp. sensor
Compressor
Product
Compressor Shell-and-tube inlet Shell-and-tube inlet

Low-pressure switch Suction temp. sensor temp. sensor Low-pressure switch
for heating temp. sensor
Shell-and-tube inlet inlet for heating
Low-pressure switch temp. sensor Stop valve Shell-and-tube
temp. sensor Low-pressure switch
for cooling for cooling
Stop valve Suction

temp. sensor

Vapor liquid separator Vapor liquid separator
Water flow switch

Freeze protection
Entering water temp. sensor temp. sensor Leaving water temp. sensor
Fan
COOL
Stop valve Defrosting HEAT
temp. sensor
High-pressure switch
Ambient Stop valve
Filter temp. sensor
High pressure sensor

Discharge temp.sensor
Check valve 4-way valve
Electric expansion valve IPM module Compressor
for heating
9
Check valve Low-pressure switch for heating
Product
Suction
temp. sensor
Filter Stop valve
Refrigerant Low-pressure switch for cooling
nozzle
for cooling Stop valve
Shell-and-tube
outlet temp. sensor
Filter
Shell-and-tube
inlet temp. sensor Vapor-l iquid separator
Entering water Freeze protection
Leaving water
Filter temp. sensor temp. sensor temp.s ensor
Solenoid valve
Product
1.4 Technical parameters

1.4.1 Electrical parameters
Electrical data table
Compressor Fan
Model Power supply MRC (A) NRC (A) NRC (A)
quantity quantity
380V-415V AC
LSQWRF35VM/NaA-M 1 30 17.5 2 0.7
3Ph 50Hz
380V-415V AC
LSQWRF60VM/NaA-M 2 30 17.5 2 1.28
3Ph 50Hz
380V-415V AC
LSQWRF65VM/NaA-M 2 30 17.5 2 1.28
3Ph 50Hz
380V-415V AC
LSQWRF35VM/NhA-M 1 22 19.2 2 0.70
3Ph 50Hz
380V-415V AC
LSQWRF60VM/NhA-M 2 52 32.9 2 1.28
3Ph 50Hz
380–415VAC
LSQWRF130VM/NhA-M 4 92 13.6±10%(60Hz) 4 1.28
3Ph 50Hz
Notes:
(a) MRC: maximum running current (A)
(b) NRC: nominal running current (A)
10
Product
1.4.2 Performance parameters

Model LSQWRF35VM/NaA-M LSQWRF60VM/NaA-M LSQWRF65VM/NaA-M
Cooling capacity kW 32 60 65
Heating capacity kW 36 65 70
Rated cooling power kW 12.4 21.9 24.8
Rated heating power kW 10.8 20.2 21.9
Sound level dB(A) 62 68 68
Power supply 380–415V AC 3Ph 50Hz
The microcomputer implementing fully automatic control, displaying
Operation control
the operation state and giving an alarm
High-pressure and low-pressure safety cut-out, high-discharge
temperature cutout, freeze protection, overflow control, phase safety
Safety controls device, water flow safety control, pressure sensor cutout, temperature
sensor cutout, four-way valve safety control, compressor overheating
control
Type Fully enclosed rotor-type compressor
Quantity 1 2 2
Starting mode With variable frequency
Water-side heat
High-efficiency shell and tube heat exchanger
exchanger
Water flow
m3/h
Compressor
5.5 10.32 11.18

volume
Water
kPa 75 55 60
resistance
The highest
bearing MPa 4.6
pressure
Connection
By external threads
method
Connection thread G1 1/2 external thread G2 external thread G2 external thread
Air-side heat
High-efficiency finned coil heat exchanger
exchanger
Rated power
Air side W 750×2 750×2 750×2
of fan
Airflow
m3/h 1.26×104 1.26×104 1.26×104
volume
Width mm 1340 2200 2200
Outline
Depth mm 845 965 965
dimension
Height mm 1605 1675 1675
Net weight mm 400 689 689
Operating weight kg 400 758 758
11
Product
Model LSQWRF35VM/NhA-M LSQWRF60VM/NhA-M LSQWRF130VM/NhA-M

Cooling capacity kW 32 60 130
Heating capacity kW 35 65 137
Rated cooling power kW 11.7 20.8 43.9
Rated heating power kW 10.6 19.9 41
Sound level dB(A) 62 68 69
Power supply 380–415V AC 3Ph 50Hz
The microcomputer implementing fully automatic control, displaying the
Operation control
operation state and giving an alarm
High-pressure and low-pressure safety cut-out, high-discharge
temperature cut-out, freeze-up control, overflow control, phase safety
Safety controls device, water flow safety control, pressure sensor cutout, temperature
sensor cutout, four-way valve safety control, compressor overheating
control
Type Fully enclosed rotor-type compressor
Quantity 1 2 4
Starting mode With variable frequency
Water-side heat
High-efficiency shell and tube heat exchanger
exchanger
Water flow
m3/h 5.5 10.32 22.36
volume
Compressor
Water
kPa 80 55 60
resistance
The highest
bearing MPa 4.6
pressure
Connection
By external threads
method
Connection
G1 1/4 external thread G2 external thread /
thread
Air-side heat
High-efficiency finned coil heat exchanger
exchanger
Rated power
Air side W 750×2 750×2 750×4
of fan
Airflow
m3/h 2×0.63×104 2×1.2×104 4×1.55×104
volume
Width mm 1340 2200 2305
Outline
Depth mm 845 965 1980
dimension
Height mm 1605 1675 2120
Net weight mm 405 686 1286
Operating weight kg 445 755 1413
12
Product
1.4.3 Scope of supply

Item Heat pump
Modules S
Three-wire control lines (8m) S
Accessories for the unit XE73-25/G S (Additionally purchased)
Electric control cabinet O
Auxiliary electric heater O
Power lines O
Control lines O
Connecting hose O
Thermometer O
Pressure gauge O
S= standard; O= field-supplied; P= optional
13
Unit Control
Unit Control
14
Unit Control
2 Unit control
2.1 Schematic diagram
Anti-freezing and over-temperature sensor
Input
Description:
(1) A water flow cutout is used to judge the water flow rate. When the flow rate is too low, it will trip off,
and the control board will send this signal to the display and the water pump. Then, the display will
tell there is an error, the water pump will stop and the unit will stop or will not start.
(2) A high/low pressure cutout is used to judge the system pressure. When the system pressure is too
high/low, it will trip off, and the control board will send this signal to the display. Then, the display
will tell there is an error and the unit will stop or will not start.
(3) An ambient temperature sensor is used to detect the temperature of the environment where the
unit is which will determine whether to start or stop the fan and determine the steps of the electric
expansion valve when initializing. When this sensor fails, the control board will detect and send this
signal to the display. Then, the display will tell there is an error and the unit will stop or will not start.
(4) A discharge temperature sensor is used to detect the discharge temperature. When the sensed
temperature is too high or this sensor fails, the control board will detect and send this signal to the
display. Then, the display will tell there is an error and the unit will stop or will not start.
15
Unit Control
(5) An entering water temperature sensor is used to detect the temperature of the entering water which
will determine whether to start or stop the compressor and the auxiliary electric heater. When this
sensor fails, all compressors of the unit will stop.
(6) Defrost temperature sensor is used to detect the liquid tube temperature of fins serving the
condenser, which will determine whether to start the fan. When the sensed temperature is too
high or this sensor fails, the control board will detect and send this signal to the display. Then, the
display will tell there is an error and the unit will stop or will not start.
(7) An anti-freezing and overheating prevention temperature sensor is used to detect the water
temperature. When it fails, compressors and fans of the corresponding unit will stop.
(8) A leaving water temperature sensor is used to detect the leaving water temperature. When this
sensor fails, compressors and fans of the corresponding unit will stop.
(9) An air temperature sensor on shell-and-tube heat exchanger is used to detect the air temperature.
When this sensor fails, the compressor in a cooling state will have to be stopped and the display
will tell there is an error. If the sensor fails in a heating state, only the display will tell an error.
(10) An liquid temperature sensor on shell-and-tube heat exchanger is used to detect the liquid
temperature. When this sensor fails, the compressor in a cooling state will have to be stopped and
the display will tell there is an error. If the sensor fails in a heating state, only the display will tell an
error.
(11) A suction temperature sensor is used to detect the suction temperature. When this sensor fails, the
compressor in a cooling state will have to be stopped and the display will tell there is an error. If the
sensor fails in a heating state, only the display will tell an error.
(12) High-pressure sensor is used to detect the discharge pressure. When the detected temperature is
too high, control the compressor to regulate the frequency of discharge.
16
Unit Control
2.2 Operation flowchart

2.2.1 Cooling
Is system 1 ready to
start compressors?
Yes
Compressor 1 stops.
open
Yes
EXV for cooling mode
is in timer control.
EXV for cooling mode

is reset.
stop compressors?
17
Unit Control
2.2.2 Heating
Yes
start compressors?
Yes
open
Yes
EXV for heating mode

is in timer control.
EXV for heating mode
is reset.
stop compressors?
18
Unit Control
2.3 Key control logics

2.3.1 Cooling control
◆◆ Freeze protection
For each single unit, when the leaving water temperature is lower than the anti-freezing setpoint,
freeze protection will work; when the leaving water temperature go higher than the normal value, freeze
protection will be removed.
When the anti-freezing temperature and the leaving water temperature are between the anti-freezing
setpoint and the normal value, the unit will keep the current operation status.
◆◆ Shutdown
Manual and timer shutdown: compressors, fans and then water pumps will stop.
Shutdown at the set temperature: compressors and fans will stop but water pumps will still be working.
Shutdown due to malfunction: compressors and fans will stop but water pumps will still be working.
2.3.2 Heating control

◆◆ Over-temperature protection for heating
For each single unit, when the leaving water temperature goes higher than the anti-over-temperature
setpoint, over-temperature protection will work and the operation frequency of the compressor (or
dual compressors) will be lowered until the leaving water temperature is lower than the setpoint. Stop
compressors one by one if the operation frequency has been recorded the lowest and the leaving
temperature remains above the setpoint for 1 minute.
With the leaving water temperature back to normal, over-temperature protection will be removed. If
it occurs with a reduced frequency, the compressor should be controlled by the water temperatures for
working as normal.
◆◆ Control to the auxiliary electric heater
When the control function of the auxiliary electric heater has been activated through the control panel,
the unit is able control the auxiliary electric heater.
The auxiliary electric heater is able to work automatically as long as there is no fault of the flow switch
and all entering and leaving water temperature sensors work normally.
When the control function of the auxiliary electric heater has been activated through the control panel,
the auxiliary electric heater will not work any more.
When all entering and leaving water temperature sensors are faulty, the auxiliary electric heater will
stop working.
When any flow switch fails, the auxiliary electric heater will stop working.
When over-temperature protection for heating works but the auxiliary electric heater is still required for
operation, it will work continuously when its heating task is finished.
◆◆ Shutdown
Manual or timing shutdown: compressor stops firstly, and the auxiliary electric heater secondly, and
then the fan and the water pump stop.
Shutdown upon the temperature set point: the compressor and the fan stop firstly, while the water
pump keeps running.
Shutdown upon errors: the compressor stops firstly and the fan stops, while the water pump keeps
running.
19
Unit Control
2.3.3 Control to the compressor

“First on, first off”/ “first off, first on” control indicates the numbered compressor which is started/
stopped firstly will then be stopped/started firstly.
2.3.4 Control to the fan

The fan will start when the unit is turned on and will stop when the compressor is turned off. During
defrosting, the fan does not work but will back to working when defrosting exists.
2.3.5 Control to the 4–way valve

At the cooling mode, the 4–way valve will not work when the unit goes for defrosting or the unit is off.
At the heating mode, the 4–way valve will work when the unit is turned on or defrosting quits.
2.3.6 Control to the water pump

When there is demand for any single unit, the water pump will start. When there is no demand for all
water pumps, the water pump will stop.
2.3.7 Control to the electric expansion valve

The electric expansion valve will be initialized when the controller is powered on for the first time.
After the compressor has been started, the electric expansion valve starts to adjust its opening angle.
2.3.8 Protection
◆◆ Recoverable protection
The unit will stop when it receives no signal from the controller. Once there is any communication fault
for any unit, all compressors of this unit will stop and then the water pump will follow.
◆◆ Irrecoverable protection
(1) Protection against high pressure for the compressor 1/2
When it is detected that the high pressure cutoff of the compressor 1/2 is tripped off, compressor 1/2
will stop immediately. If both compressors are closed, their fans will be delayed to stop. In this case,
the control panel will display an alarm symbol, which should be cleared manually for resuming normal
operation.
(2) Protection for the flow switch
When it is detected for some unit that the flow switch is opened, this unit will stop. When protection for
the flow switch occurs for all unit, all compressors and water pumps will stop.
(3) Fault of communication
When a single unit does not receive any signal from the controller, this unit will stop automatically. For
the unit with communication fault, when all its compressors stop and then the water pump will follow.
(4) Protection against phase loss/reversal
When there is phase loss or reversal for power supply, power for the main board will be cut off directly.
In this case, there is nothing for the main board.
(5) Protection for abnormal 4–way valve
When it is detected that the entering water temperature is 4°C higher than the leaving water
temperature and the leaving water temperature continuously goes down, the control panel will display this
fault.
20
Unit Control
2.4 Introduction to controller

Please refer to the owner's manual of the controller before use.
2.5 Smart management system

2.5.1 Long-distance monitoring/BMS interface
This long-distance monitoring system allows users through a computer to remotely monitor up to 255
variable-frequency modular-type chillers, including turning on/off the units, setting parameters, giving
alarms for malfunctions, which is an efficient tool for management of intelligent air conditioning systems
for modern buildings.
2.5.2 Network of the long-distance monitoring system

Net topological diagram
BMS (Third-party)
Computer
Note: the system as shown in the figure above consists of 1~16 single units depending on the actual
demand of the project.
21
Unit Control
From the topological diagram above, the long-distance monitoring system consists of 3 parts:
The first part is the BMS and the converter used to convert RS232 signals from the BMS into RS485
signals of the long-distance monitoring network.(it is required only when RS232 is used for the BMS)The
second part refers to the communication network including the communication lines and the connected
hardware.
The second part refers to the communication network, that is, the communication lines and the
connected hardware.
The third part is the patching board responsible for the data exchange between the air conditioning
system and the monitoring PC. When there is only one unit, the patching board is not required and RS485
signal lines from BMS can be directly connected to the BMS port of the control panel. When there are
multiple units, signal lines from BMS are required to connected to the BMS port through the patching
board.
Communication lines
Line code Description Type
Category– 5 twisted pairs, two four-wire connectors, one for the
L1 S
communication patching board, the other for the unit.
L2 Category-5 twisted pairs, two four-wire connectors S
Category-5 twisted pairs, one four-wire connector for the
L3 communication patching board, the other connector for RS232– O
485 photoelectric converter.
R1 DB9 serial port line S
S=standard; O=field-supplied; P=optional
2.5.3 Hardware
Parts list
Name Model Code Remarks Type
A repeater is required every 800m
Optoelectronic
communication distance or every
isolated RS485–W LN02200010 P
30 communication nodes (control
repeater
panels).
Optoelectronic It is required when there is no
isolated GD01 LN02200020 remote monitoring kit but RS232 P
converter communication is used.
It is for remote monitoring other than
BMS.
Remote
FG30-00/A(M) MC200027 Other main parts: monitoring S
monitoring kit
software disc, optoelectronic
isolated converter
It is required when several units
forms a net work. It is intended to
connect two or three communication
Accessory
XE73-25/G NC20700050 lines. P
XE73-25/G
Other main parts: communication
patching board (with fixed support),
connection line
22
Unit Control
Notes:
(a) When distance between the output of the BMS system or the output of the optoelectronic converter
to CN4 of the display panel exceeds 800m, an optoelectronic repeater is required to reinforce signals.
(b) The optoelectronic repeater is also required between the CN5 of the display panel and the main
board for extending the communication distance.
2.5.4 Model selection instructions
◆◆ Rules for model selection
Supply scope
Item Model Type Remarks
CPU: Pentium 4 or above
Memory: 512M or above
Hard disc: 30G or above
Computer \ O Serial port: 1 at least
Opertion system: Windows XP/
Windows 2003/Windows Vista/
Windows 7
It is for remote monitoring other
than BMS.
Remote monitoring kit FG30-00/A(M) S Other main parts: monitoring
software disc, optoelectronic
isolated converter
Communication patching It is required when several units
ZTSJ0 P
board forms a network.
It is required when there is no
Optoelectronic isolated
GD02 P remote monitoring kit but RS232
converter
communication is used.
A repeater is required every
Optoelectronic isolated 800m communication distance or
RS485-W P
repeater every 30 communication nodes
(control panels).
4–core (2–core) category Its length depends on the actual
\ O
5 twisted pairs demand.
Selection of part quantity
Communication Optoelectronic
Model Remote monitoring kit
patching board repeater
• One set of remote

monitoring kit FG30-
A repeater is
00/A(M) is required；
required every 800m
• The remote
A series modular type One patching board for communication
monitoring kit is not
chiller one unit distance or every 30
required when the unit
communication nodes
is directly
(control panels).
• Connected to the
BMS system.
23
Unit Control
◆◆ Examples of model selection

Example 1
This project consists of 3 LSQWRF60VM/NaA-M, one control panel and BMS. The maximum
communication distance is within 800m. The BMS interface is RS232 and one converter is required.
Name Code Quantity
Air conditioning system EL01500720 1 (3 LSQWRF60VM/NaA-M)
Optoelectronic converter EN02200020 1
Example 2
This project consists of 7 groups LSQWRF60VM/NaA-M, six groups concluding 3 and the other
concluding 1. Seven control panels are required. The communication distance is larger than 800m but be
or less than 1600m. One repeater is required for somewhere the communication distance is over 800m.
The BMS interface is RS485.
Name Code Quantity
A series variable-frequency
EL01500720 19 LSQWRF60VM/NaA-M
modular type chiller
Accessory XE73-25/G NC20700050 7
Patch board ZTSJ0 30118023 6
Optoelectronic repeater
EN02200010 1
RS485-W
Example 3
This project consists of 35 air conditioning systems including 103 LSQWRF60VM/NaA-M units. Among
then, there are 34 air conditioning systems which consists of 3 LSQWRF60VM/NaA-M. The remaining
consists of 1 LSQWRF60M/NaA-M. Totally 35 control panels are required. A repeater is required for
somewhere the communication distance is over 800m but less than 1600m and when the communication
nodes (control panels) exceeds 35. The BMS interface is RS232. Besides, one converter is required.
Name Code Quantity
A series variable-frequency
EL01500720 103 LSQWRF60VM/NaA-M
modular type chiller
Accessory XE73-25/G NC20700050 35
Patch board ZTSJ0 30118023 34
Optoelectronic repeater
EN02200010 2
RS485-W
Optoelectronic converter D02 EN02200020 1
24
Unit Installation
Unit Installation
25
Unit Installation
3 Unit installation
3.1 Installation flowchart
Technical disclosure
Material purchase
Check on the
field conditions
Installation of the Connection of the Installation of

Piping Electric wiring
main unit water system condensate pipes
Installation of
Pressure test connection
components
Anti-corrosion and
Insulating
insulation of pipes
Cleaning of pipes Fixing
Protection for
finished products
Check on the security of all equipment
Commissioning
26
Unit Installation
3.2 Preparations before installation

3.2.1 Precautions for installation
WARNING
• Installation should be performed by GREE appointed service personnel, or improper installation would
lead to unusual opera tion, water leakage, electric shock or fire hazard.
• The unit should be installed on the foundation which is capable of supporting the unit, or the unit
would fall off or even lead to personal injury.
• All electric installation should be done by electrician in accordance with local laws and regulations, as
well as the User’s Manual and this Service Manual. Besides, the special power lines should be used,
as any improper line would lead to electric shock or fire hazard.
• All electric lines should be safe and secured reliably. Be sure the terminal board and electric lines will
not be affected by any external force, or it would lead to fire hazard.
• The electric lines between the indoor and outdoor units should run properly to make the cover of the
electric box secured tightly, or it would cause the terminal board overheated or cause electric shock
or fire hazard.
• Cut off the power supply before touching any electric element.
A
CAUTION
• The unit should be grounded properly and the ground line is not allowed to connect with the gas line,
water line, lightning rod or phone line.
• The breaker should be installed, or it would lead to electric shock.
• The drain pipe should be installed in accordance with the Installation, Startup and Maintenance
Manuall and this Service Manual to ensure free drainage, and the drain pipe should be insulated
against condensation. Once the drain pipe is installed improperly, it would lead to water leak which
then will damps the ceiling and furniture.
• Do not place the unit where there is oil fog, like kitchen, or the plastic would be aged, broken off or
the polluted evaporator would lead to water leak and poor performance.
• Do not place the unit where there is corrosive gas (like sulfur dioxide), or the corroded copper tubes
or welded joint would lead to refrigerant leakage.
• Do not place the unit where there is inflammable gas, carbon fiber, inflammable dust or volatile
combustible, as they would lead to fire hazard.
CAUTION
• Always use safety outfits at the construction site.
• No smoking and no drunken operation are allowed at the construction site.
• Wear no gloves and tighten the cuff when operating the machinery and electrical equipment. Do not
maintain it during operation.
• Use the abrasive-disk cutter and stand at the side of the rotating abrasive disk.
• Clean the opening when installing the riser pipe, and then cover it tightly. Do not throw down any
material.
• The use of the electric and gas welders should be approved firstly. Once used, a fire extinguisher
should be prepared and a service man should be there always. There should be no inflammable and
explosive substances around the welding site.
• A platform should be set up when working high above the ground.
27
Unit Installation
3.2.2 Importance of installation

See the table below for problems occurred frequently and impacts.
No. Typical problems Impact
It would lead to harder maintenance, poor
1 Inadequate space for installation ventilation, poor heat exchanging or even
abnormal operation.
2 Improper piping of the water system The unit would fail to run normally.
It would make foreign matters enter the
water system, which then would lead to
3 Improper cleaning for water piping
heavy scaling on the heat exchanger,
cracked or leaked heat exchanger.
It would damage the electric element and
4 Mis-wiring of power lines
lead to safety hazards.
5 Mis-wiring of communication lines It would lead to abnormal communication.
Improper protection to the The unit would fail to run with the
6
communication lines communication fault.
Missed, cracked, unqualified insulation
Poor insulation for the chilled water
7 and insulation with inadequate thickness
lines
would lead to poor heat exchanging.
Unqualified vibration reduction measures
Unqualified vibration reduction
8 would lead to in creased vibration and
measures
noise, or even abnormal operation.
No protective sleeve for the wall-thru Water leak would be led to by friction
9
water pipes between the wall-thru pipe and the wall.
Improper arrangement of equipment Improper arrangement would make the
10
and pipes machine room look messy.
Service providers should be qualified and know special requirements on installation for certain so as to
guarantee installation quality. Otherwise, service personnel should be properly trained and licensed before
servicing.
28
Unit Installation
3.3 Installation instructions

3.3.1 Outline dimensions
(1) LSQWRF35VM/NaA-M
(unit:mm)
Installation hole
15
729
22
1200
Water oulet:
1605
G1-1/2 male thread
Drain valve
Water inlet :
G1-1/2 male thread
146
166
246 126 121 765

1340 845
29
Unit Installation
(2) LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M

(unit:mm)
1
1 Installation hole
15
844
22
2060
1675
Water oulet:
G2 male thread
Water inlet:
G2 male thread
143
Drain valve
880
258
851 965
2200
30
Unit Installation
(3) LSQWRF35VM/NhA-M
(unit: mm)
Installation hole
15
729
22
1200
Water oulet:
1605
G1-1/2 male thread
Drain valve
Water inlet :
G1-1/2 male thread
146
166
246 126 121 765

1340 845
31
Unit Installation
(unit: mm)
1
1 Installation hole
15
844
22
2060
1675
Water oulet:
G2 male thread
Water inlet:
G2 male thread
143
Drain valve
880
258
851 965
2200
(unit: mm)
2120
376 1650
Water in
369
2040 (Anchor bolt 6-M12) 1930 (Anchor bolt 6-M12)
2305 1980
32
Unit Installation
3.3.2 Precautions for installation

(1) Pipelines and electric lines should be correctly connected.
(2) Rubber pads and rubber flexible connectors should be used during installation for noise and
vibration reduction.
(3) Under subzero climate, when the heat pump runs for cooling, anti-freeze liquid is required.
(4) Dedicated lugs should be used for lifting. During lifting, proper protection should be taken so as to
avoid pipelines from being damaged.
3.3.3 Installation environment

(1) The unit should not be installed within 25m of the residence; otherwise a sound insulating wall
should be set up.
(2) When the unit is to be installed at the roof, the foundation should be located at the heel posts. If the
floor is quite thin, or there is vip rooms under the floor, the spring damper is required.
(3) Fire, inflammably, corrosive gas and waste gas should be avoided around the unit. Also, the unit
cannot be installed around the chimney and discharge fan.
(4) Ventilation should be in good condition and no air flow would be trapped.
3.3.4 Installation and service space

The interval between each single unit should be larger than 0.5m so that there is enough space for
entering air and maintenance. The distance between the unit and any barrier should be or larger than 1m
so as to keep good ventilation around the unit.
If possible, a suncover can be set up 3m ahead of the unit.
Outlet Outlet Outlet Outlet
Inlet Inlet Inlet Inlet
Inlet Inlet Inlet
Electric box
Inlet Inlet Inlet The inlet and outlet pipes
both are at this side.
Inlet
Inlet Inlet
Electric box
The inlet and outlet pipes
both are at this side.
33
Unit Installation
3.3.5 Installation foundation

(1) The installation foundation should be designed by qualified designers.
(2) The foundation should be made of cement or steel structure and be capable of supporting the
weight of the unit. Additionally, the upper surface should be kept level. It would be better to keep
drain grooves around the foundation.
(3) The installation should be secure enough, and its surface should be smooth.
3.3.6 Handling and lifting

Handling and lifting of the main unit should be performed by a qualified installation team. During lifting,
the main unit should be kept stable both horizontally and vertically.
Each unit will undergo a series of strict factory inspections and tests to guarantee the expected
performance and quality. However, special attention should be paid during handling and shipping to
prevent the control system and the piping system from being damaged.
The unit should be moved by the forklift or hoisting machine. During lifting, the canvas lifting or steel
ropes in use should be of enough strength and go through the based and then bundled tightly. The unit
should be lifted stably from four corners. Meanwhile, be sure there should be protective pads to prevent
lifting ropes contacting with the unit. The inclination angle during lifting should be less than 15 degree.
The unit should be moved softly and severe collision and forced drag are not allowed. Please do lifting as
shown in the figure below for units with similar structure.
Dursing hoisting, the length of
the spreader should be longer
than that of the unit.
A-A
B-B
During transport by the forklift ,the symmetric holes should
be used at the A-A or B-B base of the unit itself, or at the
wooden base.
34
Unit Installation
3.3.7 Placement of the main unit

(1) Place the unit on the foundation.
(2) There should be no clearance between the foundation and the baseboard of the unit.
(3) Lift the unit, put the rubber pad on the foundation and then place the unit on the rubber pad. After
that, be sure the horizontal slope of the unit can’t exceed 1/1000. If so, take an adjustment by
stuffing spacers into the clearance between the foundation and the baseboard of the unit until the
slope is satisfactory.
Installation foundation
Vibration isolator Drain
3.4 Piping and insulation

3.4.1 Installation of the water system
Considerations stated below shall be taken for the water system.
(1) Each water inlet and outlet should be labeled properly to avoid misconnection.
(2) A flexible connector should be used at the chilled water outlet to reduce vibration transmission.
(3) A manometer, a thermometer and a gate valve shall be installed at the chilled water inlet /outlet.
Moreover, a drain valve shall be installed at the outlet and an air release valve shall be installed at
the inlet. At the highest point of the water system, another release valve shall be installed, while at
the lowest point of the water system, another drain valve shall be installed to facilitate drainage.
(4) The water inlet/outlet pipe should be tightly insulated to reduce heat loss and dewing. When pipes
are exposed under 0°C, a electric heater shall be installed.
(5) A filter shall be installed upstream of the water pump, otherwise there will be foreign matter entering
the water system, then generating scale on the surface of heat exchangers.
(6) Construct a temporary bypass around the unit to prevent drainage from flowing back to the interior
of the unit.
(7) Under ultra-low temperature in winter, showdown at night will cause the evaporator and pipeline
frozen up, so it is highly recommended to add alcohol and propanol mixture in chilled water. Do not
cut off the power supply when the unit is turned off, otherwise the freeze protection does not work.
Alternatively, cut off the power supply and drain the water system thoroughly.
35
Unit Installation
(8) When the unit runs under the low load requirement, in order to avoid low load protection which
would affect the service life of the unit, make sure the water capacity is more than 1/6 of total
rated flow rate per hour of each module (for instance, for some project with four modularized
LSQWRF60VM/Na-M units, if the rated water flow of each unit is 10.3m 3/h, then the required
capacity of the whole project should be larger than 10.3*4*1/6=6.87m3). When water piping that is
properly connected is quite short, a water tank is required to ensure an adequate flow rate inside
the piping system.
NOTE
Do not treat the unit with saline mixture to prevent corrosion.
See the diagram below to install the water system.
Manual exhaust valve

Flow switch
Flow switch
Flow switch
Connecting the
u
distribution box
Legend:
u Flow switch
Follow the procedures below to drain the water system.

(1) Loosen screws around the panel and then take down it.
(2) Remove anticlockwise the blind plug located at the bottom of the heat exchanger to let the chilled
water flow out, after that, tighten the blind plug and reinstall the panel. (Note: place the drainage
equipment beneath the drain pipe to prevent pollution caused by the drain water.
Drain valve
36
Unit Installation
NOTE
Keep the purge valve of the water system open in order to drain the evaporator and condenser
completely.
3.4.2 Requirements on piping
The piping slope should meet design and construction regulations and the flexible pipe is not allowed
to be longer than 150mm.
Pipes which go through the dilatation joint and the settlement joint should be protected with the flexible
joint.
No matter which connection is used, welding, threaded connection or flange connection, the connection
joint can’t be in the wall, floor or sleeve pipe.
The riser pipe should be installed vertically. When the floor height is or less than 5m, a pipe clip
is required. When the floor height is or larger than 5m, at least 2 pipe clips should be required. The
installation height of the pipe clip is 1.8m. For the main riser pipe, it should be secured with the fixed
bolster to support the weight of the riser pipe.
See the table below for the installation standards of the pipes.
Item Allowable deviation Inspection method
DN≤100mm 2L‰, max.440mm
Straightness By the ruler, tape measurement
DN>100mm 3L‰, max.460mm
Verticality 25L‰, max.425mm By the ruler, tape measurement
Interval of Parallel Pipes 15mm By the ruler, tape measurement
Parallelism of Parallel Pipes 3mm By the ruler, tape measurement
Piping flowchart
Check documents
Check materials Prefabricate pipes
and drawings
Install hangers Take the pressure

Install pipes
and brackets test
Take protective
Take the anti-corrosion Rinse pipes measures to the
and insulation treatment
finished products
(1) Check documents and drawings

1) Check the process flow, construction procedures and quality requirements in accordance with
drawings and technical data.
2) Check the installation location, installation height, arrangement, and installation space of pipes in
accordance with equipment drawings and building drawings.
(2) Check materials
1) Before installation, check for the mode of the valves, clean them and then take the strength and
air-proof tests.
2) Pipes should be cleaned with a steel brush or abrasive paper. After that, seal the pipe ends and
keep both the internal and external surface dry.
3) Pipes should be painted twice with anti-rust paint without any curtaining and voids.
37
Unit Installation
(3) Prefabricate pipes

1) Make out the installation drawing which clearly indicates the branch pipes, pipe diameter, reduced
pipes, location of valves, installation dimensions etc. Then, prefabricate pipes in accordance this
installation drawing. Pipes should be processed with dedicated cutting machine, leaving no burrs at
the pipe ends. After that, pipes should be cleaned to prevent sands and dusts from damaging the
joint.
2) Pipe supports should be prefabricated in accordance with design requirements. The contact part
between supports and pipes should be separated with wood blocks which has taken anti-corrosion
treatment and is as thick as the insulation.
(4) Install hangers and brackets
1) The supporting beam should be fastened to the wall, pillar or other building structure. It should be
placed horizontally with the top surface parallel with the center line of the pipe.
2) Pattern, installation, interval and standard height of supports for metal pipes should meet
corresponding design requirements and codes.
3) Supports should be installed securely and contact the pipe closely. Separate supports are
required at the connection joint between the pipe and the equipment.
4) Supports for chilled and cooling water pipes as well as main and branch pipes in the machine
room should be anti-vibration.
5) When a single-bar hanger is used, anti-vibration hangers should be set up every 15m and at the
pipe ends, valves, tee joints and elbows.
See the table below for the interval of brackets.
Diameter (mm) 15 20 25 32 40 50 70
Max interval Insulated pipe 1.5 2 2.5 2.5 3 3.5 4
between
brackets Non-insulated
2.5 3 3.5 4 4.5 5 6
(m) pipe
Max interval Insulated pipe 5 5 5.5 6.5 7.5 8.5 9.5

between
brackets Non-insulated
6.5 6.5 7.5 7.5 9 9.5 10.5
(m) pipe
NOTE
It is applicable to the pipes with working pressure less than 2.0 and insulation density less than
200kg/m3 or without any insulation.
(5) Install pipes

Supply and return water pipes with the diameter of being or being less than DN32 should be thread
connected, and pipes with the diameter of being or larger than DN40 should be welded. Those which must
be detachable should be flange connected. Before installation, foreign matters inside the pie should be
removed.
38
Unit Installation
Threads should be processed by the threading machine.

Use lead oil and oakum as stuffing materials and remove those outside of the threads after pipes have
been installed.
Threads should be clean and at least 90% threads should be intact. Two or three spirals of threads
shoud be exposed at the connection joint after installation without any exposed stuffing. Galvanized pipes
should be protected and local damage should take anti-corrosion treatment.
3.4.3 Installation of the expansion tank
An expansion water tank should be installed for the closed-circuit water system to buffer water
expansion and constriction as well as avoid effects on the water pipes caused by makeup water.
(1) After the full water test, surface of the water tank should be de-rusted, finished and treated with ant-
corrosion measure. The artificial anti-rust class should be st3.
(2) After that, when water tank temperature is below 30°C, it should be painted with red lead rust-proof
paint twice. When the temperature is among 30~70°C, it should be painted with chloroethylene 4~5
times. When the temperature is among 70~95°C, it should be painted with heat-resistant anti-rust
paint 4~5 times. Do not do directly welding on the water tank with surface treatment.
(3) The water tank should be installed horizontally and placed at a bar support which should go 100mm
beyond at each side of the base plate. Height of the bar support should be no less than 300mm.
(4) When water pipes are installed in the room without the heating system, the water tank, expansion
pipe, circulating pipe, and signal pipe all should be insulated.
(5) The installation height of the expansion water tank should be in the way that the lowest level of the
water tank is at least 1m above the highest point of the water system.
(6) For the mechanical circulating air-to-water system, in order to keep the expansion water tank and
water system run normally, the expansion pipes of the expansion water tank should connect to the
suction inlet of the circulating water pump. For the gravity circulating system, the expansion pipes
should connect to the top of the main supply water riser pipe.
(7) For the two-pipe air conditioning system, when there is only one expansion water tank for chilled
and hot water, its effective volume should be figured out based on the heating conditions.
39
Unit Installation
(8) When the water tank is or higher than 1500mm, it should have ladders both inside and outside of
the water tank. When the water tank is or higher than 1800mm, it should have two glass gauges to
indicate the water level.
(9) The circulating pipe should be connected to the main return pipe. Horizontal distance between the
connection point to the constant-pressure point should be no less than 1500~3000mm.
3.4.4 Installation of condensate pipes

Setup → insulating → fastening
NOTE
• Adverse slope is not allowed for the slope larger than 1%.
• It can’t connect with the rain water pipe, sewage pipe or other pipes.
• The elbow ventilator should be installed at the highest point of the condensate pipe to prevent foreign
matters coming into the drain pipe.
• The S-shaped trap and flexible joint are necessary.
• The diameter of the pipes should be suitable.
• The wall-thru or floor-thru pipes should be protected by the steel sleeve. Do not put seams inside
the sleeve. The steel sleeve should keep flush with floor, or 20mm above the floor for the floor-thru
pipes. The steel sleeve is not allowed to affect the slope of the pipe and can’t be used as the support
of the pipe. Clearance between the pipe and the sleeve should be stuffed by flexible non-inflammable
material.
(1) Setup
The condensate pipes should be at least 300mm away from the electric box of the unit. For special
space, its installation location should be approved by the corresponding designers.
Connection of the main pipe and the branches
40
Unit Installation
When the three-way valve is used for the condensate pipe, its straight two connectors should be kept
at the same level as shown in the figure below.
Tee joint
When there are several indoor units at the same floor, their condensate is usually drained out through
one main pipe. In this case, the branches pipe for each unit should be located higher than the main pipe.
The size of the condensate pipe is determined by the capacity and number of the indoor units.
Size of the tee drain pipe should match with the running capacity of the unit.
As pressure at the water outlet is quite large, an water trap is required for the drain pipe, which is
applicable to the horizontal type air handing units and the indoor units of the duct type air conditioners.
A=P+25mm
B=P/2+25mm
P indicates the the passive pressure (mmH2O, 1mmH2O=9.80665pascals) .
The pipe diameter should be or larger than 32mm.
Water trap
(2) Insulating
The extended drain pipe should be insulated and special care must be paid to the elbows. See the
table below for the thickness of the insulation.
Drain pipe (mm) Thickness of insulation (mm)
All ≥15
Insulation should be thickened at humid areas.
41
Unit Installation
(3) Fastening
The insulating tube is just required to be bundled and fastened at the supporting bracket.
3.5 Electrical connection

3.5.1 Safety precautions
NOTE
• The electricians should be licensed.
• The air conditioning is Class I appliances and should be grounded reliably.
• The grounding resistance should comply with the national standards covered in GB 50169
• The yellow-green line is for grounding. Do not use it for other purpose or cut it off or fixed with the
self-tapping screw, other wise it would lead to electric shocks.
• The power supply should be reliably grounded and do not connect the ground line to a) running water
lines; b) gas lines; c) blow-off lines; d) other unreliable places.
• Do not make the power lines and communication lines entwined and arrange them separately with a
distance no less than 20cm, otherwise it would lead to abnormal communication.
• Do not wire improperly power lines and communication lines. When the power line is wired to the
communication port, it would make the main board burnt out.
3.5.2 External connection
Follow the wiring diagrams below to complete control output connections.
■ LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M, LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M
Note: the output control lines of the AC contactors for the running indicator, water pump 1, water pump
2, auxiliary electric heater 1, auxiliary electric heater 2 can be wired to the corresponding wiring board
of all units, while those for the error indicator and external passive contact switch should be wired to the
corresponding wiring board of all units.
42
Unit Installation
When external passive contact switch is available for multiple units, the wiring board
9 and 10 of each unit should be wired to the dry contact A and B.
Unit 1 Unit 2 3 Unit 16
When it is required to display errors of several units, the wiring terminals (3, 4) of each
unit should be wired to the wiring terminals HL2 (C, D) of the error indicator. (If it is
required to display the error of each unit independently, then the error indicator of each
unit should be wired independently to the corresponding error output wiring terminals
(3,4) of each unit.
Unit 1 Unit 16
5 5 5 5
KM1
When multiple modules have direct control over one water pump, wiring terminals 5
and 6 for one modular unit are connected to terminals E and F respectively of the AC
contactor (KM1) for the water pump, or 7 and 8 to E and F respectively of an AC
contactor (KM2).
43
Unit Installation
Unit 1~16
KM1
When multiple modules have direct control over one water pump, its AC contactor is
wired to an AC contactor (KM1 or KM2) of any one module.
Unit 1 Unit 2 Unit 3
11 12 11 12 11 12 11 12
G H
KM3
When one auxiliary electric heater serves more than one modules, its wiring terminals
11 and 12 are connected to terminals G and H respectively of an AC contactor marked
with KM3.
Unit 1~16
11 12
KM3
When multiple modules have direct control over one auxiliary electric heater, its AC
contactor is wired to an AC contactor (KM3 or KM4) of any one module.
44
Unit Installation
■ LSQWRF60VM/NhA-M
External passive contact switch
error indicating
running indicating
Note: the output control lines of the AC contactors for the auxiliary electric heater 1, auxiliary electric
heater 2 can be wired to the corresponding wiring board of all units, while those for the error indicator and
external passive contact switch should be wired to the corresponding wiring board of all units.
12 13 12 13 12 13 12 13
G H
KM3
with KM3.
Unit 1~16
12 13
KM3
45
Unit Installation
■ LSQWRF130VM/NhA-M
Control output neutral line

Control output contactor (electric heater 2; 220V live line)
Control output contactor (electric heater 1; 220V live line)
Remote start/stop
Remote start/stop
Control output contactor (user water pump 2; 220V live line)
Control output contactor (user water pump 1; 220V live line)
Control output neutral line (error indicator; 220V live line)
Control output contactor
Control output neutral line (running indicator; 220V live line)
Control output contactor
Note: the output control lines of the AC contactors for the auxiliary electric heater 1, auxiliary electric
heater 2 can be wired to the corresponding wiring board of all units, while those for the error indicator and
external passive contact switch should be wired to the corresponding wiring board of all units.
73 74 73 74 73 74 73 74
G H
KM3
with KM3.
Unit 1~16
73 74
KM3
46
Unit Installation
3.5.3 Specification of power supply

See the table below for selection of the power lines and the air switches.
Min. sectional area of the
power cable (mm2) Capacity of the
Model Power supply
Live Neutral ground air switch (A)
line line line
LSQWRF35VM/NaA-M 380V–415VAC 3Ph 50Hz 6 6 6 32
LSQWRF35VM/NhA-M 380V–415VAC 3Ph 50Hz 6 6 6 32
Notes:
(a) The specifications of the breaker and power cable listed in the table above are determined based on
the maximum power (maximum amps) of the unit.
(b) The specifications of the power cable listed in the table above are applied to the conduit-guarded
multi-wire copper cable (like, JYV copper cable, consisting of PV insulated wires and a PVC cable
jacket) used at 45°C and resistible to 90°C (subject to GB/T16895.15-2002). If the working condition
changes, they should be modified according to the related applicable standard.
(c) The specifications of the breaker listed in the table above are applied to the breaker with the working
temperature at 40°C. If the working condition changes, they should be modified according to the
related applicable standard.
3.5.4 Wiring of the electric control cabinet
(1) LSQWRF35VM/NaA-M, LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M, LSQWRF35VM/NhA-M
1. If the unit is a heat pump chiller with an

auxiliary electric heater, it is required to
do wiring in accordance with this diagram.
2. If the unit is capable of cooling only, the
way of wiring and elements inside the dotted
line above are not needed.
47
Unit Installation
HL3
10
12 14 5 7
KM1
KM3
KM4
KM2
13 15 6 8
EH1
EH2
KM1 KM4
KM2 KM1 KM3 KM4
HL3 6
HL4 HL5 HL6

Water pump
48
Unit Installation
3.5.5 Field wiring

Follow the safety codes below.
(1) All wiring shall comply with applicable codes and engineering requirements.
(2) All field wiring shall be performed by qualified electricians.
(3) Never perform wiring before the power supply is cut off.
(4) Any damage caused by the improper external wiring shall be at the installer’s expense.
WARNING
Only copper conductors are allowed.
Follow the procedures below to wire the power lines to the electric box.
(1) The power cord must be routed inside the conduit.
(2) The power cord must enter the electric box through a rubber or plastic ring to avoid any damaged
caused by the sharp edge of the metal sheet.
(3) The power cord close to the electric box must be attached securely to prevent the terminal block of
the electric box affected by the outside force. The power cord shall be installed with a suitable cord
anchorage against cord loosing. See the wiring diagrams below for external wiring.
The wire clamp here should

hold the cable jacket down.
The cable should be
fixed with fasteners.
The cable should be fixed
with wire ties at these two
holes of the upright column.
The thru-hole after wiring

should be sealed to prevent
insects from entering.
LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M
49
Unit Installation
The cable should be fixed

by these three fasteners.
The thru-hole after wiring
should be sealed to prevent
insects from entering.
LSQWRF60VM/NhA-M
(4) The unit shall be grounded reliably and never connect the ground wire with the gas fuel pipe, water
pipe, lightening rod or telephone line.
(5) After wiring, O-rings should be tightened to prevent coming of insects.
Follow the procedures below to connect control lines.
(1) The field supplied control line shall be at a minimum 1mm2.
(2) The electric box will send the control signal (220 AC, 5A) to control the chilled water pump and
auxiliary electric heater, however, never do not drive them directly through the control signal but
through their AC contactors.
(3) Switching signals (220VAC, 2A) for the running and error indicators are available for the electric
box.
(4) The remote switch control signal is available for the electric box and please pay attention to the
input passive dry contact.
(5) A reasonable length of the control line should be left outside the unit and the rest should be bundled
and fed into the electric box.
(6) The connection line of the display panel and main board is reliably grounded through the main
board. Beside, communication lines between units also should be grounded.
50
Unit Installation
3.5.6 Networking and wiring between units

(1) LSQWRF35VM/NaA-M, LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M, LSQWRF35VM/NhA-M
51
Display panel
4
130 Electric box 130 Electric box 65 Electric box 65 Electric box
Main Main Main Main Main Main 3

board PC board PC board PC board PC board PC board PC
to connect from the
Left 3 Left 3 next unit to the last unit
(2) LSQWF65VM/NaA-M, LSQWF130VM/NaA-M
3
(a maximum of 16 modules)
52
Communiction line
Central electric box Central electric box
Unit Installation
415V 3N~ 50Hz 415V 3N~ 50Hz 415V 3N~ 50Hz 415V 3N~ 50Hz
To electric box
To electric box To electric box To electric box
Covnerter
BMS PC for remote monitoring
Unit Installation
Notes:
(a) As shown in the diagram above, CN33 and CN25 of all modules are connected by a three-core four-
pin shielded communication line whose ground wires of both ends will be linked to the terminal near
the main board.
(b) As shown in the diagram above, CN4 on the display panel is connected to a CN25 on a main board
of any unit by a four-core shielded communication line whose ground wire will be linked to the
terminal near the main board.
(c) The power lines should be connected to L1, L2, L3, and N at XT1 through a piece of four-core rubber
sleeve cable as shown in the figure above.
(d) There are two solutions for remote monitoring.
• Install the remote monitoring software at the PC.
• Based on GREE provided Modbus protocol, the user can do second development to this protocol.
• Note: those enclosed by the dotted lines indicate the remote monitoring equipment. When the
quantity of the display panel exceeds 30 or length of the communication line exceeds 800m, extra
photoelectric relay is required. The photoelectric relays, communication lines (class 5 twist pairs),
converters are optional. PC should be prepared by the user themselves.
53
Unit Installation
3.5.7 Electric wiring digram

(1) LSQWRF35VM/NaA-M
54
Unit Installation
(2) LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M
55
Unit Installation
56
Unit Installation
57
Unit Installation
58
Unit Installation
59
Unit Installation
The electric wiring diagrams on the unit always prevail.
60
Unit Installation
3.5.8 Jumpers
When it is required to replace the main board, be sure the main board can match with the applicable
jumpers.
Jumpers list
Model Code Jumper no. Matched compressor
LSQWRF35VM/NaA-M 4202021905 QXAS-H80zN345H
LSQWRF60VM/NaA-M 4202021907 7 QXAS-H80zN345H
LSQWRF65VM/NaA-M 4202021906 6 QXAS-H80zN345H
LSQWRF35VM/NhA-M 4202021913 13 QXFS-H80zN345H
LSQWRF60VM/NhA-M 4202021915 15 QXFS-H80zN345H
LSQWRF130VM/NhA-M 4202021916 16 QXFS-H80zN345K
61
Test Operation, Troubleshooting and Maintenance
Test Operation,
Troubleshooting and
Maintenance
62
4 Test operation, troubleshooting and maintenance

4.1 Commissioning
4.1.1 Flowchart of commissioning
Preparation
Check on installation
Check on the unit
Commissioning
4.1.2 Safety precautions for commissioning

WARNING
• Safety measures should be taken during indoor operation. Any commissioning and service personnel
should grasp and observe safety regulations of construction work.
• Refrigeration mechanic, electricians, welders and other technicians of other special work all should be
licensed.
• Power supply should be cut off before any operation to the unit. Meanwhile, please observe required
safety operation.
• All installation and operation should comply with design requirements of this product and local safety
requirements.
• Never force the compressor to run by electrifying it directly.
4.1.3 Preparation before commissioning
(1) Manual of installation instructions
(2) Certificate of qualification
(3) Electric wiring diagrams
(4) Sheet of saturated temperature and pressure
4.1.4 Check before commissioning

◆◆ Check the completeness
(1) Is the surface of the unit in good condition?
(2) Is there leak at any pipe connector?
(3) Is any part damaged?
◆◆ Check installation of the unit
Do the installation location, installation foundation and maintenance space comply with corresponding
requirements?
◆◆ Check the water system
63
(1) Is the water flow direction in the condenser and evaporator correct?
(2) Are the chilled water pipes clean? Is there any foreign matter trapped in the joints? Is the water
quality satisfactory?
(3) Is the insulation of the chilled water pipes in good condition?
(4) Are the manometer and thermometer connected correctly (Is the manometer at a right angle with
the water pipe, and is the thermometer’s probe inserted into the water pump)? Do the initial values
of the manometer and thermometer comply with requirements before commissioning?
(5) Is the leaving water flow switch installed correctly? Is this flow switch correctly wired to the electric
control cabinet?
(6) Start the chilled water pump through the contactor and see: does the chilled water pump run in the
correct direction (-clockwise)? If not, check the wiring of the water pump.
(7) Run the chilled water pump and see: is the water pressure stable? do the reading values of water
pressure change slightly? Is the running ampere in the rated range? If not, just handle all of them.
(8) Does the water makeup device of the expansion water tank work well? Does the automatic exhaust
valve work well? For the hand exhaust valve, open it to exhaust air inside the system.
◆◆ Check the work load
(1) Are the air handling units connected correctly?
(2) Do all diffusers work smoothly?
(3) Are the tightness and insulation of the conditioned space in good condition?
(4) Does the required load match with the capacity of the unit?
WARNING
• Do not check the power supply without any proper detection device and preventive measures, or it
would lead to severe in juries or even death.
• Each single unit should be supplied with dedicated power lines. After wiring, check the following items
one by one.
1) Is the size of the air switch proper?
2) Does all electric installation meet corresponding electric standards or codes?
3) Is all wiring correct?
4) Are all interlocks work well?
5) Do all contacts work well?
6) Are the power supply and insulation in good condition?
7) Is the setpoint of the control and protection elements correct?
4.1.5 Check for initial run
Check for initial run should be performed by four steps as shown below when the unit is ready for initial
run.
◆◆ Check for communication
Check if the displayed number of modules is the same as the real number. If so, it indicates
communication goes normal. If not, take the following inspections.
(1) Are all connected units powered on?
(2) Does each single unit have a unique address?
(3) Is there any single unit which has not been detected by the control? Is the communication line of
the mainboard connected correctly or is the communication line itself non-defective?
64
◆◆ Check for a single unit

(1) Commission one single unit first and stop all others.
(2) Do the compressor, fans and the 4-way valve run normally without any unusual noise?
(3) Is the voltage phase difference lower than ±2%?
(4) Voltage phase difference =(phase difference between the max and average voltage)/(average
voltage)×100%.
(5) Start up this single unit.
(6) Do its compressor, fans and the 4-way valve run normally without any unusual noise?
(7) Check other units one by one in the same way.
◆◆ Check for the water flow of a single unit
In order to prevent the water temperature changing too quickly, it is suggested to open all terminal
units in commissioning, and observe and record the pressure drop of the manometers at the outlet
and inlet pipes. Also, adjust the flow control valves or shut-off valves to make the flow meet application
requirements.
When the environmental temperature is available, let the unit perform cooling (>15°C). When the unit
has run stably for 10 minutes, the normal difference of the entering and leaving water should be 4-6°C.
(1) If the temperature difference is larger than 4-6°C, raise it by reducing the water flow of other units.
(2) If the temperature difference is smaller than 4-6°C, ignore it in the event that the difference of other
units is suitable, and reduce the water flow of this unit in the event that the difference of other units
is also unsuitable.
(3) Check for the water flow of other units one by one in the same way.
◆◆ Check for operation of the whole unit
(1) Check the difference of the entering and leaving water temperature of each unit when the whole
unit has been in operation. If temperature adjustment fails, reconsider the capacity of the selected
water pump.
(2) Start up the whole unit under the full load. When the whole unit has run stably for one hour, check if
the water temperature and the air conditioning effect meet the user’s requirements.
(3) Observe and record the entering and leaving water temperature, condensing and evaporating
pressure. Then, stop the unit and check the setpoint of each parameter on the control panel. After
that, complete the commissioning date sheet.
(4) When the unit comes to the protection state, diagnose it and and seek solutions.
65
4.2 Troubleshooting
4.2.1 Diagnostics
Diagnostic name Affects signal source Description
When the pressure is too high or
the current exceeds the setpoint,
the corresponding compressor will
stop and the indicating LED on the
High pressure protection High pressure cutout control panel will light on and the
error information will be displayed
on the error log. The error must
be manually cleared for normal
operation of next time.
• When it is detected the low-

pressure cutout of the compressor
is opened frequently, the
compressor will be shut down
Low pressure protection Low pressure cutout immediately.
• Meanwhile, the error information
will be displayed. The error must
be manually cleared for normal
operation of next time.
When it is detected that the

discharge temperature exceeds the
setpoint, the compressor will be
Discharge temperature shut down immediately. Meanwhile,
High discharge protection
sensor the error information will be
displayed among the error log. The
error must be manually cleared for
normal operation of next time.
• When the entering water
temperature fails, all compressors
and fans of the corresponding
single unit will stop. When the
discharge temperature sensor
fails, the display panels will tell
“Discharge temperature sensor X
error”.
Temperature sensor • In this case, the unit can be
Temperature sensor
protection started normally only when it
has been unlocked. When the
antifreeze temperature sensor or
leaving water temperature sensor
fails, the display panel will display
this error. In this case, the unit
can resume normal operation
only when the error is cleared
manually.
66
Diagnostic name Affects signal source Description

When the single unit fails to receive
Communication fault Main board signals from the control panel, it will
automatically be shut off.
When phase loss/reversal occurs,
Phase loss/reversal
Phase protector the phase protector will cut off the
protection
power supply to the main board.
When a single unit detects its flow
switch is open, this module will
Protection for the water flow
Contact automatically be shut down. When
switch
all flow switches are closed, the
water pump will stop.
When it is detected that the entering
water temperature is 4°C higher
than the leaving water temperature
Protection for the four-way Entering and leaving water
and the latter continuously goes
valve temperature sensors
down, the compressor will be
stopped immediately and the
control panel will display this error.
When it is detected that the
compressor IPM current or
Protection for the Drive board of the temperature is higher than the
compressor IPM module compressor setpoint, the compressor will be
stopped immediately and the
When it is detected that the fan IPM

current or temperature is higher
Protection for the fan IPM
Drive board of the fan than the setpoint, the compressor
module
will be stopped immediately and the
67
4.2.2 Flow chart of troubleshooting

(1) High pressure protection
High pressure protection
Yes
Does the fan stop

running or run Yes Check the fan.
reversely?
No
Does the electric Replace the coils of the

expansion valve work No electric expansion valve
or even the main body.
normally?
No
Is the pressure switch Replace the pressure switch

damaged or is the wiring Yes
or rewire it.
loosened ?
No
Is the finned heat

Yes Clean the water pipes.
exchanger too dirty or
aged?
No
Are water pipes designed

improperly?The flow becomes Yes Adjust the water pipes.
smaller when the terminal unit
is turned off.
No
Is there air inside the

Expel air. If necessary,
system? (It often occurs Yes
vacuum the whole system.
after maintenance.)
No
If this occurs frequently, the

Does the controller
Yes main board should be
alarm incorrectly?
replaced.
No
Contact the supplier.
68
(2) Low pressure protection
Low pressure protection
Yes
Does the water pump

not started or the flow is Yes Check the water pump.
inadequate?
No

normally? or even the main body
.
Yes
Is the pressure switch Replace the pressure switch

damaged or is the wiring Yes
or. rewire it
loosened?
No
Is scale formed inside

Yes Clean the exchanger.
the shell and tube?
No
Are water pipes designed

improperly? The flow becomes Yes Adjust the water pipes.
smaller when the terminal unit
is turned off.
No
Do the leak test. Then add

Does refrigerant leak? Yes
refrigerant.
No

Does the controller
alarm incorrectly?
replaced.
No
69
(3) High discharge protection
High discharge temp

protection
Yes
Does the discharge Is the resistance of the Replace the discharge

temperature go to No No
temperature sensor temperature sensor.
125°C? normal?
Yes
Yes
Replace the damaged main
board.

normally ? or even the main body.
Yes
Is the filter clogged? Yes Clean the filter.
No
Is the incorrect temperature Adjust the discharge

sensor used?( it often occurs Yes
temperature sensor.
after maintenance.)
No

Does the controller
alarm incorrectly?
replaced.
No
70
(4) Phase protection
Phase loss/reversal
protection
Yes
Is the phase sequence Yes Adjust the wiring.

incorrect?
No
Is there phase loss? Yes Check the power supply.
No
Is the phase protector Replace the phase

Yes
damaged? protector.
No

Does the controller
alarm incorrectly?
replaced.
No
71
(5) Water flow switch protection
Water flow switch protection
Yes
Does the water pump

Yes Start the water pump.
not start?
No
Is the the flow switch not Install the flow switch or

installed or installed Yes
check the installation.
improperly?
No
Is the flow switch faulty? Yes Maintain the flow switch.
No

Does the controller
Yes main .board should be
alarm incorrectly?
replaced.
No
72
(6) Temperature sensor error
Temperature sensor error
Yes
Is the sensor plug

Check the direction of the
placed properly into the No
sensor probe.
main board?
Yes
Remove the sensor and

see if its voltage is Replace the temperature
No
within the safety range? sensor.
Yes
(7) Protection for the four-way valve
Protection for the

4-way valve
Yes
Entering and leaving Check the entering and

water temperature Yes
leaving water sensors.
sensor drop off.
No
Is the 4-way valve

Yes Replace the 4-way valve.
damaged?
No
If this occurs frequently,

Does the controller
Yes the main board should
alarm incorrectly?
be replaced.
No
73
4.3 Power distribution

4.3.1 Power distribution logic
3Ph 3Ph
380V AC 3Ph
Main board
Protection conditions: phase loss or reversal of the power input for the phase protector.
Action result: No power for the controller and ON/OFF operation is failed.
Handling: interchange the wiring sequence and check if the voltage of the 3-phase power supply is
normal.
4.3.2 Introduction to main electric elements

Image Name Description
It is used to check if the phase

Phase loss/reversal protector sequence of the power supply is
correct or if there is power loss.
It is used for the running and

Intermediate relay
fault indicators.
74
4.3.3 Main board

41 39 38 37 32 30 28
40 36 35 34 33 31 29 27 26
42
43
1 3 8 13 17 21 22 23
5 14 18 24
4 6 7 15 25
19
9 16 20
10
11
12
No. Name
1 Water flow switch
2 System 2 low-pressure switch for heating
3 System 1 high-pressure switch
4 System 1 low-pressure switch for heating
5 External passive contact switch
6 Preserved
7 Preserved
8 System 1 low-pressure switch for cooling
9 System 1 discharge temp. sensor
10 System 1 defrosting temp. sensor
11 Anti-freezing temp. sensor
12 Leaving water temp. sensor
13 Inlet water temp. sensor
75
No. Name
14 Preserved
15 System 2 defrosting temp. sensor
16 System 2 discharge temp. sensor
17 System 1 shell-and-tube inlet temp. sensor
18 System 2 shell-and-tube inlet temp. sensor
19 System 1 suction temp. sensor
20 System 2 suction temp. sensor
21 Outdoor ambient temp. sensor
22 System 1 high pressure sensor
23 System 2 shell-and-tube outlet temp. sensor
24 System 2 high pressure sensor
25 System 1 shell-and-tube outlet temp. sensor
26 220V input
27 COMP2 band heater 2
29 4-way valve 2
30 4-way valve 1
33 Bottom band heater 2
34 Bottom band heater 1
35 Water pump 1
36 Auxiliary electrical heater 1
37 Auxiliary electrical heater 1
38 Water pump 2
39 Error indicating
40 Solenoid valve 2
41 Solenoid valve 1
42 System 2 high-pressure switch
43 System 2 low-pressure switch for cooling
76
4.4 Replacement of main parts

4.4.1 Brief introduction
Image Name Function
It is the power source of

the whole system, used to
compress low-pressure and
Compressor
low-temperature refrigerant
to be high-pressure and high-
temperature gas.
It is intended to separate
Vapor-liquid separator refrigeration oil from liquid
refrigerant.
It is used to control the flow

Four-way valve direction of refrigerant for either
heating or cooling.
It is intended conduct heat

exchange between the
refrigerant and the second
refrigerant.
At the cooling mode, it is

intended to turn the
high-temperature high-pressure
refrigerant vapor into refrigerant
liquid by releasing heat to
the cooling medium. At the
heating mode, it is intended to
vaporize refrigerant liquid by
absorbing heat from the cooling
medium.
It is intended to control
refrigerant flow rate to make it
match with the required load
and make the refrigerant flowing
into the evaporator evaporate
completely.
77
4.4.2 Replacement instructions

(1) LSQWRF35VM/NaA-M and LSQWRF35VM/NhA-M
Replacement of the compressor
Note: be sure there is no refrigerant inside the system and power supply has been cut off before
replacement.
Steps Image Instructions
• Remove screws at the front

pane.
• Loosened screws should be
put together to avoid loss.
• Pull the front panel upwards
1. Remove the and then remove it.
front panels. • Properly keep the removed
front panel to avoid from
being damaged.
• Note: there are two clasps
at each panel for connecting
with side panels.
• Remove the insulation of the

compressor.
• Loosen screws of power lines
with a screwdriver.
2. Remove power
• Draw out power lines.
lines and the
• Draw out the electric heater.
electric heater.
• Note: power lines and
their terminals should be
numbered to avoid incorrect
rewiring.
• Desolder pipes quick to avoid

3. Disconnect deformation.
power lines to the • Keep the replaced
compressor. compressor complete for
further analysis.
78

replacement.
• Loosen screws at feet of the

4. Loosen screws compressor with a adjustable
at feet of the or box spanner.
compressor. • Loosened screws should be
put together to avoid loss.
• During replacement, care

must be taken to not damage
rubber pads.
• Seal the replaced compressor
5. Replace the to prevent moisture entering;
compressor with • Place a new compressor
a new one. at the rubber pads. Steel
bushing is required for rubber
pads.
• Tighten the steel bushing with
screws.
• Reconnect and resolder the
suction and discharge lines.
6. Reconnect Do charge nitrogen during
the suction line, soldering.
the discharge • After soldering, charge high-
line, other pipes pressure nitrogen for the leak
and electric test.
lines. Then, • Power on the unit and start it
check for normal through a AC contact for 2~3
operation of the seconds.
compressor. • When the compressor runs
reversely, it would generate
harsh noise.
79

replacement.
7. Put back the Put back front panels and

front panels. tighten screws.
Note: there would be trapped oil inside the compressor during replacement, which would not affect its
reliability but increase resistance to the rotors and then consume more power. In order to expel it, it would
be better to install another valve at the lower point of the suction line. After that, run the compressor for
ten minutes and then open this valve until no oil comes out. Repeat this operation twice for normal oil
level.
Replacement of the 4–way valve
Note: be sure power supply has been cut off and refrigerant has been reclaimed before replacement.
• Remove screws at the front panel;
• Loosened screws should be put
together to avoid loss.
• Pull the front panel upwards and
then remove it.
1. Remove the
• Properly keep the removed
front panel.
front panel to avoid from being
damaged.
• Note: there are two clasps at each
panel for connecting with side
panels.
• Disconnect electric lines inside

and outside of the electric box.
2. Remove the
• Protection measures should be
electric control
taken to the internal elements
box.
to prevent them from being
damaged.
80

3. Record
the direction
• Remember installation direction
of the 4–way
before replacement.
valve before
• Remove coils.
desoldering. The
• Wrap it with wet cloth to keep its
multi-system
completeness for further analysis.
unit can not take
• Desolder the 4–way valve.
other system
as a example.
• Do use the one with the same

model for replacement. The one
with different model can be used
after being approved by relative
4. Replace it technicians.
with a new one • Wrap it with wet cloth.
and clean the • Reconnect the main body with
system. four pipes as before.
• Solder the pipelines with a
soldering gun.
• Do charge nitrogen during
desoldering.
• Keep the vacuum degree to

5. Vacuum -1.0bar. Vacuuming period would
the system be longer for the repaired unit.
and recharge • Charged refrigerant should be
refrigerant. the same as that stated at the
nameplate.
81
Replacement of the electric expansion valve
Note: check the whole system, pipelines and electric lines, cut off power supply and reclaim
refrigerant before replacement.
1. Reclaim
• Cut off power supply of the unit.
refrigerant and
• Reclaim refrigerant.
remove the middle
• Remove the middle panel.
panel.
• Take out coils.

• Loosen screws and take out pipe
2. Take out the clamps and rubber pads.
coils, pipe clamps • Wrap the valve with wet cloth to
and rubber pads. prevent the sliding block from being
burn out. In this case, care must be
taken to not let water enter the pipe.
• Desolder connection pipes and then

disconnect them with the main body
of the valve.
3. Desolder
desoldering.
connection pipes.
taken during soldering to prevent
surrounding objects from being burnt
out.
4. Take out the Take out the main body of the electric
main body. expansion valve.
82
• Solder pipes.
• Do charge nitrogen during soldering;
5. Replace it with • Protection measures should be
a new one. taken during soldering to prevent
out.
• The bulge of the coil should match

with the re cess of the main body of
6. Tighten coils, the valve.
pipe clamps and • Keep the vacuum degree to -1.0bar.
rubber pads; Vacuuming period would be longer
vacuum the for the repaired unit.
system; recharge • Charged refrigerant should be
refrigerant and the same as that stated at the
then put back the nameplate.
panel. • Power off the unit and then power it
on again.
• Put back the panel.
Replacement of the vapor-liquid separator

Note: properly reclaim refrigerant, prepare tools and keep good ventilation.
• Remove screws at the front panel.

1. Remove front then remove it.
panels. • Properly keep the removed front
panel to avoid from being damaged.
• Note that there are two clasps at
each panel for connecting with side
panels.
83

2. De-solder De-solder connection pipes with a

connection pipes. soldering gun.
3. Take out the

Loosen fixed screws and take out the
vapor-liquid
vapor-liquid separator.
separator.
• Connect a nitrogen line. When its

size is quite large, use adhesive tape
4. Clean the
for help to keep nitrogen naturally go
system by
into the vapor-liquid separator.
charging nitrogen.
• Clean the system by charging
nitrogen.
84

5. Replace it with Install the new vapor-liquid separator

a new one. as per reverse steps as stated above.
6.When it is
required to add
lubricating oil, • Charge lubrication oil from the inlet
charge it from the of the vapor-liquid.
inlet of the vapor- • separator and then do soldering.
liquid separator
before soldering.
• Solder pipes and do charge nitrogen

7. Reconnect during soldering.
pipes; vacuum the • Keep the vacuum degree to -1.0bar.
system; recharge Vacuuming period would be longer
refrigerant and for the repaired unit.
then put back the • Charged refrigerant should be
panel. the same as that stated at the
nameplate.
85
(2) LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M and LSQWRF60VM/NhA-M

replacement.

1. Remove the then remove it.
front panels. • Properly keep the removed front
panels.
• Remove the insulation of the

compressor.
• Loosen screws of power lines with a
2. Remove power screwdriver.
lines and the • Draw out power lines.
electric heater. • Draw out the electric heater.
• Note: power lines and their
terminals should be numbered to
avoid incorrect rewiring.

3. Disconnect
deformation.
power lines to the
• Keep the replaced compressor
ompressor.
complete for further analysis.

4. Loosen screws compressor with a adjustable or box
at feet of the spanner.
compressor. • Loosened screws should be put
86

replacement.
• During replacement, care must be

taken to not damage rubber pads.
• Seal the replaced compressor to
5. Replace the prevent moisture entering.
compressor with • Place a new compressor at the
a new one. rubber pads. Steel bushing is
required for rubber pads.
screws.
• Reconnect and resolder the suction

6. Reconnect and discharge lines. Do charge
the suction line, nitrogen during soldering.
the discharge • After soldering, charge high-
line, other pipes pressure nitrogen for the leak test.
and electric • Power on the unit and start it
lines. Then, through a AC contact for 2~3
check for normal seconds.
operation of the • When the compressor runs
compressor. reversely, it would generate harsh
noise.
7. Put back the Put back front panels and tighten

front panels. screws.
ten minutes and then open this valve until no oil comes out. Repeat this operation twice for a normal oil
level.
87

replacement.

• Pull the front panel upwards and then
1. Remove the
remove it.
front panel.
• Properly keep the removed front panel
to avoid from being damaged.
panel for connecting with side panels.
• Disconnect electric lines inside and

outside of the electric box.
2. Remove the
• Protection measures should be taken
electric control box.
to the internal elements to prevent
them from being damaged.
3. Record the
direction of
• Remember installation direction before
the 4–way valve
replacement.
before de-
• Remove coils.
soldering. The
• Wrap it with wet cloth to keep its
multi-system
complete ness for further analysis.
unit cannot take
• Desolder the 4–way valve.
other system as a
example.
88

replacement.
• Keep the vacuum degree to -1.0bar.

4. Vacuum
• Vacuuming period would be longer for
the system
the repaired unit.
and recharge
• Charged refrigerant should be the
refrigerant.
same as that stated at the nameplate.

replacement.
1. Reclaim
refrigerant and
remove the middle
panel.
• Take out coils.


of the valve.
3. Desolder
desoldering.
connection pipes.
out.
89

replacement.
4. Take out the main Take out the main body of the electric
body. expansion valve.
• Solder pipes.
• Do charge nitrogen during soldering.
5. Replace it with a • Protection measures should be
new one. taken during soldering to prevent
out.

with the recess of the main body of
the valve.
6. Tighten coils,
pipe clamps and
Vacuuming period would be longer
rubber pads;
for the repaired unit.
vacuum the system;
• Charged refrigerant should be
recharge refrigerant
the same as that stated at the
and then put back
nameplate.
the panel.
• Power off the unit and then power it
on again.
90

replacement.

1. Remove the front
panels.
then remove it.
• Properly keep the removed front
• Loosen screws of power lines with a

screwdriver.
2. Remove power • Draw out power lines.
lines and the • Draw out the electric heater.
electric heater. • Note that power lines and their
terminals should be numbered to
avoid incorrect rewiring.

3. Disconnect
deformation.
power lines to the
• Keep the replaced compressor
compressor.
complete for further analysis.
91

replacement.

4. Loosen screws compressor with a adjustable or
at the feet of the bushing spanner.
compressor. • Loosened screws should be put
• During replacement, care must be

taken to not damage rubber pads.
• Seal the replaced compressor to
5. Replace the prevent moisture entering;
compressor with a • Place a new compressor at the
new one. rubber pads. Steel bushing is
required for rubber pads.
screws.
• Reconnect and resolder the suction

6. Reconnect the and discharge lines. Charge nitrogen
suction line, the during soldering.
discharge line, other • After soldering, charge high-pres
pipes and electric sure nitrogen for the leak test.
lines. Then, check • Power on the unit and start it through
for normal operation an AC contact for 2 to 3 seconds.
of the compressor. • When the compressor runs reversely,
it would generate harsh noise.
92

replacement.
7. Put back the front Put back front panels and tighten
panels. screws.
ten minutes and then open this valve until no oil comes out. Repeat this operation twice for normal oil
level.

1. Remove the front
panel.
then remove it.
• Properly keep the removed front
2. Record the
direction of 4-way
valves before • Record the direction of a 4-way
remove it. It is valve.
prohibited to take • Remove its coils.
other units as • To keep it complete, wrap the valve
reference when with a wet cloth.
removing 4-way • Desolder the valve.
valves of a multi-
system unit.
93

• Do use the one with the same
model for replacement. The one
with different model can be used
after being approved by relative
technicians.
3. Replace it with a • Wrap it with wet cloth.
new one and pipes. • Reconnect the main body with four
pipes as before.
• Solder the pipelines with a soldering
gun.
desoldering.

4. Vacuum Vacuuming period would be longer
the system for the repaired unit.
and recharge • Charged refrigerant should be
refrigerant. the same as that stated at the
nameplate.
1. Reclaim
refrigerant and
remove the middle
panel.
94
• Take out coils.


of the valve.
3. Desolder
desoldering.
connection pipes.
out.
4. Take out the main Take out the main body of the electric
body. expansion valve.
95
• Solder pipes.
• Do charge nitrogen during soldering.
5. Replace it with a • Protection measures should be
new one. taken during soldering to prevent
out.

with the recess of the main body of
the valve.
6. Tighten coils,
pipe clamps and
rubber pads;
for the repaired unit.
vacuum the system;
and then put back
nameplate.
the panel.
• Power off the unit and then power it
on again.
Replacement of vapor-liquid separator


1. Remove front then remove it.
panels. • Properly keep the removed front
panels.
96

2. De-solder De-solder connection pipes with a

connection pipes. soldering gun.
3. Take out the

Loosen fixed screws and take out the
vapor-liquid
vapor-liquid separator.
separator.
• Connect a nitrogen line. When its

size is quite large, you need to
4. Clean the use adhesive tape for help to keep
system by charging nitrogen naturally go into the vapor-
nitrogen. liquid separator.
• Clean the system by charging
nitrogen.
5. Replace it with a Install the new vapor-liquid separator

new one. as per reverse steps as stated above.
97

6.When lubricating Inlet

oil is needed, you
need to charge it Charge lubrication oil from the inlet of
from the inlet of the vapor-liquid separator and then do
the vapor-liquid soldering.
separator before
soldering.
• Solder pipes and do charge nitrogen

during soldering.
7. Reconnect pipes;
vacuum the system;
for the repaired unit
and then put back
the panel.
nameplate.
98
4.5 Routine maintenance

4.5.1 Repairs to refrigerant leakage
When soapsuds often used to detect leakage of a refrigeration system is applied to possible leakage
points. If there are bubbles, leaks occur and need repairs by brazing. If soapsuds does not work, an
electronic leak detector is an alternative. Intake and exhaust pressures indicate refrigerant charge. If leaks
exist or parts are going to be replaced, leakage test must be taken. Refrigerant charges in two following
cases should be treated in different manners.
(1) Full leaks
A leak test for the system must be taken with high-pressure nitrogen (15~20 kg) or refrigerant. If
brazing is needed, gases in the system must be evacuated. The system must be treated with vacuum
pumping before refrigerant charges.
1) Connect evacuation pipes with refrigerant nozzles at low-pressure and high-pressure sides;
2) Vacuumize the system piping by a vacuum pump.
Procedures (one system as an example):
Step 1: Remove the high-pressure nitrogen that was used for the leak test.
Step 2: Fix pressure gauges to refrigerant nozzles of high-pressure and low-pressure valves (note:
vacuum pumping should be done with both valves in the meantime.). Either of two dials must register low
pressures since only its readings indicate vacuum.
Low-pressure gauge High-pressure gauge

Manifold gauge
Hose
Hose
Vacuum pumping
Step 3: Turn on switches at low-pressure and high-pressure sides. Start a vacuum pump let it continues
for 0.5~1.0 hour after the reading of a pressure gauge falls to -1bar.
Step 4: Close the valves connected to the vacuum pump shown in the figure above and then shut down
the pump. (Notice: it must be done in this order, or gases will enter the system again.)
Step 5: Take a pressure test to make sure that the pressure of the system is no less than 80Pa and will
not noticeably rebound within 1 hour.
Up to now, vacuum pumping has been finished.
3) Keep the pressure for 30 minutes, and charge refrigerant when the pressure is no more than 100Pa.
Start charging according to the proper volume indicated by the nameplate and main technical parameters
table.
99
(2) Recharge refrigerant
Low-pressure gauge High-pressure gauge

Manifold gauge Refrigerant tank
Hose
Hose
Charging process
Excessive or deficient refrigerant may cause abnormal operation, malfunction or damage to a
compressor, so charge volume must comply with the requirements on the unit nameplate which have been
decided in strict tests; The figure may serve as a reference; a charge process is as follows (one system
as an example):
Step 1: Place a refrigerant container on an electronic scale and connect the container and the pressure
gauges by a flexible tube.
Step 2: Remove gases inside the flexible tube—half turning the shut-off valve of the container, loosen
the joint device between the flexible tube and pressure gauge; tighten the joint device when a sound is
sent out for 5s.
Step 3: Power up and down the electronic scale to enable it to reset.
Step 4: Ensure that the flexible tube has been evacuated and the scale reset, turn on all valves
connecting refrigerant containers and the unit; charge refrigerant required by the nameplate to prevent
oil dilution caused by excessive charging, and inhibit a capacity decline of the unit induced by insufficient
charging; when the unit is running, make sure it is gaseous refrigerant (as possible as it can be) from a
refrigerant container (that cannot be turned upside down) that is injected into refrigerant nozzles on intake
lines; when the unit powered down, be sure to charge refrigerant via the refrigerant nozzle at the high-
pressure side (if there is no nozzle at the high-pressure side, low-pressure side is an alternative.) in case
of liquid slug.
4.5.2 Air removal

When there is air trapped in the system, expel them before charging refrigerant. The whole system
must be vacuumed in accordance with the steps stated below.
(1) Connect pipes for vacuuming at both the low and high pressure sides.
(2) Start the vacuum pump for vacuuming.
(3) When it reaches the targeted vacuum degree, charge refrigerant into the system. See the
nameplate for type and charging mount of refrigerant. Do charging from the low pressure side. A
manifold gauge should be connected to both the low and high pressure sides.
(4) Refrigerant charging would be affected by environment temperature. If refrigerant is undercharged,
start the water pump to circulate chilled water and meanwhile start the unit for refrigerant adding. In
this case, vapor refrigerant should be charged.
100
4.6 Exploded views and part lists

■LSQWRF35VM/NaA-M
■LSQWRF35VM/NaA-M (EL01500750) part list

No. Name Quantity
1 Rear Grill 2
2 Coping 1
3 Top Cover (front) 2
4 Upper Cover Plate (back) 1
5 Axial Flow Fan 2
6 Brushless DC Motor 2
7 Motor Support Sub-Assy 4
8 Condenser Assy 1
9 Pressure Sensor 1
10 Magnet Coil 1
11 Rear Grill 1
12 Dry Evaporator 1
13 4-way Valve 1
101
No. Name Quantity

14 Pressure Protect Switch 1
17 Temp Sensor Sleeving 4
19 Electonric expansion valve 1
20 Left Side Plate 1
21 Electric Expand Valve Fitting 1
22 Gas-liquid Separator 1
23 Electrical Heater(Compressor) 2
24 Compressor and Fittings 1
25 Strainer 2
26 Steam current Switch 1
27 Base Frame Assy 1
28 Electrical Heater (Chassis) 1
29 Electric Box Assy 1
30 Main Board 1
31 Intermediate relay 2
32 Terminal board 2
33 Phase Reverse Protector 1
34 Main Board 2
35 Rectifier bridge 1
36 Filter board 1
37 Main Board 1
38 Gland Bush 1
39 Front Panel (right) 1
40 Left Front Panel 1
42 Terminal board 2
43 Reactor 4
44 One Way Valve 1
45 Filter 1
46 Sensor Sub-assy 1
47 Temperature Sensor Support 1
48 Right Side Plate 1
102
■LSQWRF60VM/NaA-M, LSQWRF65VM/NaA-M
■LSQWRF60VM/NaA-M(EL01500720), LSQWRF65VM/NaA-M (EL01500760) part list

No. Name Quantity
1 Rear Gril 2
2 Coping 2
3 Top Cover 4
4 Axial Flow Fan 2
5 Axial Flow Fan Nesting 2
8 Condenser Assy 1
10 4-way Valve 2
11 Filte 2
12 Magnet Coil 1
13 Rear Grill 1 2
103
No. Name Quantity

16 Pressure Sensor 1
17 Dry Evaporator 1
18 4 Way Valve Coil 1
24 Handle 4
26 Strainer 4
35 Electronic Expansion Valve 2
38 Main board 2
39 Main board 2
41 Right Front Panel 1
45 Terminal Board 1
46 Terminal Board 1
47 Reactor 1
48 Bottom Cover Plate 1
50 Terminal Board 1
51 Phase sequence protector 1
52 Terminal Board 1
53 Filter board 2
54 Main board 1
104
No. Name Quantity

57 One Way Valve 2
■LSQWRF35VM/NhA-M
105
■LSQWRF35VM/NhA-M (EL01500770) part list

No. Name of part Quantiy
1 Rear Grill 2
2 Coping 1
3 Upper Cover Plate (back) 1
4 Top Cover (front) 2
5 Axial Flow Fan 2
8 Condenser Assy 1
9 Pressure Sensor 1
10 Magnet Coil 1
11 Rear Grill 1
12 Dry Evaporator 1
13 4-way Valve 1
23 Plastic Ring Of The Liquid Separator Line 1
25 Strainer 2
26 Conduit 2
27 Water Flow Switch 1
28 Electric Heater Strip 1
30 Main Board 1
32 Terminal board 2
34 Main Board 2
36 Filter board 1
37 Main Board 1
38 Gland Bush 1
39 Front Panel (right) 1
41 Shut-off Valve 2
42 Solenoid Valve 1
106

44 Terminal board 1
45 Reactor 4
46 One Way Valve 1
47 Filter 1
48 Handle 2
52 Radiator 2
53 Radiator 1
54 Ring For Flow Diversion 2
55 Nesting Of The Axial Flow Fan 2
56 Axial Flow Fan Assy 2
107
■LSQWRF60M/NhA-M
■LSQWRF60VM/NhA-M (EL01500830) part list

1 Rear Grill 2
2 Coping 2
3 Axial Flow Fan 2
4 Ring For Flow Diversion 2
6 Condenser Assy (Left) 1
7 Rear Grill 1 2
8 Pressure Sensor 1
10 Condenser Assy (Right) 1
11 Chiller barrel 1
108

12 Filter 2
13 4-way Valve 2
14 Magnet Coil 1
19 4-way Valve Fitting 1
25 Filter 4
26 Water Flow Switch 1
28 Electrical Heater (Compressor) 2
30 Electrical Heater (Compressor) 2
34 Solenoid valve 2
35 Solenoid valve Fitting 2
36 Electronic expansion valve 2
38 Terminal board 1
39 Terminal board 1
40 Reactor 1
41 Electric Box Assembly 1
42 Terminal board 1
43 Terminal board 1
44 Main Board 1
48 Filter board 2
50 Main Board 2
51 Main Board 2
53 Radiator 2
109

55 One Way Valve 2
■LSQWRF130M/NhA-M
■LSQWRF130M/NhA-M (EL01500970) part list

No. Name of parts Quantity
1 Rear Grill 4
2 Streamlined Dome 4
110
Unit Installation

3 Axial Flow Fan 4
5 Condenser Assy 2
6 One Way Valve 4
8 Rear Panel 2
10 Dry Evaporator 1
14 Temperature Probe 3
16 Electromagnetic Valve 4
19 Magnet Coil 1
21 4-Way Valve 4
24 Bidirection Strainer 8
25 Magnet Coil 2
27 One Way Valve 8
35 Electrical Heater 4
37 Electrical Heater 4
38 Electric Cabinet Sub-Assy 1
39 Radiator 4
40 Radiator 4
41 Terminal Board 5
42 Main Board 4
43 Drive Board 4
44 Main Board 2
111
Unit Installation

45 Main Board 2
46 Filter Board 4
48 Terminal Board 2
49 Terminal Board 1
51 Terminal Board 1
55 Electric Cabinet Assy 2
56 Terminal Board 2
57 Reactor 2
58 Terminal Board 2
59 Electric Cabinet Assy 2
60 Cut-off valve 1/4(N) 8
66 Magnet Coil 1
67 Sensor Support 2
112
Unit Installation
4.7 Maintenance
4.7.1 Requirements for maintenance
The unit has undergone a series of strict tests prior to delivery to ensure qualified performance,
however, in order to keep reliable performance and extend its service life, the unit should be maintained
routinely and periodically by the qualified service personnel.
Routine maintenance items
Is there any unusual noise and vibration?
Is there any unusual noise and vibration for the compressor in operation? Is there any unusual smell?
Do the operating pressure, voltage and current keep normal? If not, figure out the cause and then
eliminate it?
Are all temperature sensors and pressure transducers installed securely?
Periodic maintenance items

Is any wiring loosened and insulated securely?
Does any electric element work reliably? If not, change it timely?
Does any throttling valve and control valve leaks? Can any valve be opened or closed flexibly? Is any
filter clogged?
Is the temperature setpoint proper?
Is there a large amount of condensate at the chilled water pipe or the condensate pipe? Is insulation
layer damaged?
◆◆ Requirements on water quality and cleaning
Industrial water used as chilled water produces little scale, but well or river water will bring much scale,
sand and other sediment which then would block up the chilled water flow and make the evaporator frozen
up. Therefore, it is necessary to filter or chemically soften water before it flows into the water system and
also take analysis to quality. Once it is found water quality is dissatisfactory, and then only industrial water
is available.
Water quality requirement
Cold/hot water Trend
Items Circulating Makeup Scalelike
Corrosion
water water sediment
pH (25°C) 6.8-8.0 6.8-8.0 ○ ○
Electrical
conductivity μs/cm <400 <300 ○ ○
(25°C)
Basic Cl- mg (Cl-)/L <50 <50 ○
items 2- 2-
SO4 mg (SO4 )/L <50 <50 ○
Acid consumption
mg (CaCO3) /L <50 <50 ○
(pH4.8)
Total hardness mg (CaCO3) /L <70 <70 ○
Fe mg (Fe) /L <1.0 <0.3 ○ ○
Other S2- mg (S2-) /L Undetectable Undetectable ○
items NH4+ mg (NH4+)/L <1.0 <0.3 ○
2
SiO mg (SiO2)/L <30 <30 ○
NOTE: “○” indicates possible corrosion or scaling.
113
Unit Installation
Even though water quality is under strict control, calcium oxide or other minerals will gradually
accumulate on the surface of the evaporator. Then, it will reduce the heat exchange efficiency of the
evaporator and consequently lead to poor performance of the unit.
Therefore, the pipe system should be cleaned periodically. Oxalic acid, acetic acid and formic acid can
be used as the organic cleaning agent, but the strong chloracid is not allowed as it will corrode the copper
tube of the heat exchanger and then lead to water and refrigerant leakage.
(1) Preparation of materials and tools
Several bags of environmental friendly scale remover, or similar cleaning liquid.
(2) Cleaning instructions
1) Estimate the required amount of scale remover in accordance with the system water volume and
severity of scailing.
2) Add the scale remover to the water tank and the scale remover.
3) Start through the contact the water pump every 10 minutes and spread the scale remover in water
more quickly and widely.
4) After that, follow the steps below.
• Let the water pump run for another 1-2 hour(s).
• 1-2 hours later, change the cleaning solution to anti-rusting agent. Then, drain the water system
and check the water quality. If water is cloudy, then it indicates the cleaning effect is satisfactory.
• Open the water inlet to see if scale on the shell and tube has been removed. If not, clean the
shell and tube separately again by the skilled serviceman and then rinse them. If there is still
sand, scale and other foreign matters at the bottom of the shell and tube, let cleaning solution in
from the inlet pipe and then let the foul water out through the drain outlet.
• Fully charge the water system and let it run for another 1-2 hour(s).
• Stop the unit to drain up waste solution. If impossible, drain it with making up water at the same
time until all waster solution has been drained out completely (at this time water is transparent
and PH is 7).
• Repeat steps last two steps above.
• Clean or change the filters in the water system.
• See if the difference between the entering and leaving water temperature is improved.
NOTE
• Although the cleaning agent is innocuous, but care also should be taken not to let it spill into eyes.
• The serviceman with injuries on the hand is not allowed to take this task.
Before and after cleaning, observe the running status of the unit, summarize the cleaning effect and
record the running parameters.
◆◆ Cleaning of the finned heat exchanger
In order to keep fins work efficiently, be sure there are no leaves, cotton wool, insects, and other
contaminants on the outer layer of fins, or they would lead to more energy consumption and high
discharge pressure. Generally, fins should be cleaned after the unit has run for 6-12 months, or more
frequently when the environment is polluted more seriously.
114
Unit Installation
(1) Cut off the power supply.

(2) Clean with high-pressure air fins against the direction of the inlet air, or clean with high-pressure
water fins at the direction upright with that of the fins but care must be taken to control the water
pressure to prevent the fins from being pulled down and protect each electric element. If fins stick
with oily matters, clean fins with neutral detergent solution.
(3) The vacuum cleaner and nylon brush also can be used to remove dust and foreign matters on the
surface of the heat exchanger.
4.7.2 Freeze protection in winter

When the unit is not going to be used for a long time, clean and dry the internal and external surfaces
of the unit, and then it would be better to wrap it. Under the subzero climate, the unused unit should be
drained completely so that the shell-and-tube evaporator would not be frozen up. Instead, the other way is
adding some antifreeze into water to keep the water temperature no less than 0°C.
See the following steps for how to drain water out.
(1) Loosen screws on the front panel and then remove the front panel
(2) Draw out the blind plug counter clockwise to let the chilled water flow out freely until no water stays
in. After that, place the blind plug back. (Note: put the container for foul water beneath the drain
pipe to prevent foul water from polluting the site).
115
GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI
Add: West Jinji Rd, Qianshan, Zhuhai,Guangdong, China, 519070
Tel: (+86-756) 8522218
Fax: (+86-756) 8669426
E-mail: global@cn.gree.com www.gree.com
For continuous improvement in the products, Gree reserves the right to modify the product specification
and appearance in this manual without notice and without incurring any obligation.
JF00304157

Gree R410a r32 Folyadekhuto SM jf00304157

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Change for life

A series modular air-cooled chiller (heat pump)

T1/ R410A /50Hz

1.1.3 Product features

1.1.5 Operation range

Maximum and minimum entering water pressures

LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M

Ambient temperature (°C)

Leaving water temperature (°C) Leaving water temperature (°C)

LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M

Ambient temperature (°C)

Leaving water temperature (°C)

Ambient temperature (°C)

Ambient temperature (°C)

Ambient temperature (°C)

Leaving water temperature (°C) Leaving water temperature (°C)

1.3 Working principle

Finned heat exchanger

Electric expansion valve

Shell-and-tube heat exchanger

Ambient High-pressure switch

High pressure sensor

Electric expansion valve

Low-pressure switch for cooling

Solenoid valve Capillary tube

Safety valve Safety valve

Capillary tube Solenoid valve Solenoid valve Capillary tube

Compressor Shell-and-tube inlet Shell-and-tube inlet

Stop valve Suction

Shell-and-tube heat exchanger

Water flow switch

High pressure sensor

1.4 Technical parameters

1.4.2 Performance parameters

5.5 10.32 11.18

Model LSQWRF35VM/NhA-M LSQWRF60VM/NhA-M LSQWRF130VM/NhA-M

1.4.3 Scope of supply

Anti-freezing and over-temperature sensor

2.2 Operation flowchart

EXV for cooling mode

EXV for heating mode

2.3 Key control logics

2.3.2 Heating control

2.3.3 Control to the compressor

2.3.4 Control to the fan

2.3.5 Control to the 4–way valve

2.3.6 Control to the water pump

2.3.7 Control to the electric expansion valve

2.4 Introduction to controller

2.5 Smart management system

2.5.2 Network of the long-distance monitoring system

• One set of remote

◆◆ Examples of model selection

Installation of the Connection of the Installation of

Cleaning of pipes Fixing

Check on the security of all equipment

3.2 Preparations before installation

3.2.2 Importance of installation

3.3 Installation instructions