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CXB 036 A

STANDARD CONFIGURATION
The units belonging to CXB family are air cooled packaged heat pumps, for outdoor installation, equipped with hermetic scroll
compressors and axial fans, available in 13 sizes and in the following versions:
- CXB water heat pumps;
- CXB…1 water heat pumps with hydraulic module;
- CXB…A water heat pumps with hydraulic module and built in buffer tank.

HYDRAULIC VERSION
The units of the CXB family are available in multiple hydraulic versions, characterized by complete kits of all major hydraulic
components for an easier installation, with reduced time, cost and space.
In addition they can also be equipped with an optional water tank.
For all the models up to 050 the water tank is provided as loose accessory, complete with a connection kit.
The installation of the water tank is at customer care.
For all the models from 055 onwards, the water tank is provided mounted.
VERSION CODE
1: Water pump, expansion tank, relief valve, safety valve, drain valve, differential pressure switch, temperature probes.
A: Water pump, expansion tank, relief valve, safety valve, drain valve, differential pressure switch, temperature probes, water
tank with pressure gauge, relief valve and drain valve.

ACOUSTIC VERSION
L low noise version equipped with sound compressor jackets. It allows a reduction in the sound power level down to -4 dB (A).

CASING
Casing made with galvanized base and pre-painted metal sheet with epoxy powder. This treatment provides long lasting
resistance for outdoor installation, even in aggressive environmental conditions. Easily removable panels providing total access to
components inside the machine for service and maintenance purposes.

COMPRESSOR
Compressor of scroll hermetic type. These compressors are featured from high performance with low noise and vibration levels.
The high values of COP are obtained:
-By means of high volumetric efficiency in the whole operating range obtained through the continuous contact between the fix and
rotating spirals which avoids the bad space and the re-expansion of the refrigerant;
-By means of low pressure losses due to the absence of suction and discharge valves and to the continuous compression;
-By means of the reduction of the heat exchanging between the suction and discharge refrigerant, thank to the complete
separation of the refrigerant paths.
The acoustic features are obtained:
For the absence of the suction and discharge valves;
-For the continuous and progressive compression process;
-For the absence of pistons which ensures the low vibrations level and pulsation of the refrigerant.
The electric motor is suction cooled and equipped with automatic reset thermal protection and electric heater to prevent the
dilution of the refrigerant in the oil during the periods when the unit is stopped. The terminals are contained into a box IP 54
protected.

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FANS
Direct drive propeller type fans, protected to IP 54, with blades statically and dynamically balanced. The electric motors are
closed type with external rotor, equipped with built-in thermal overload and suitable for outdoor installation. Insulation class F,
internal protection according to VDE, suitable for a temperature. Operating range from -40 to +80°C. Models from 025 to 039 and
from 055 up to 090 are equipped with fan speed regulation for condensing control by steps.
Models 045 and 050 are equipped with EC axial fans allowing continuous fans speed regulation.
The air flow regulation allows the units to work with low outdoor temperature (in cooling mode only) down to 5°C and to reduce
considerably the noise level.

USER HEAT EXCHANGER

Direct expansion, stainless steel brazed plate type, insulated externally with closed cell anti condensation material and equipped
with water pressure differential switch and antifreeze protection electric heater.

REFRIGERANT CIRCUIT
The units are equipped with one refrigerant circuit entirely constructed with copper tubes, each with:
-electronic expansion valve;
-filter dryer;
-sight glass;
-high pressure switches;
-low pressure switches;
-relief valve on high pressure line.
-4-way reverse valve, liquid receiver and liquid accumulator on suction line.

AIR SIDE HEAT EXCHANGER

Condenser coils with seamless copper tubes expanded into aluminum corrugated fins. They are of high efficiency type, complete
with sub cooling circuit which allows an increase of cooling capacity without an increase of the power input.

LOW AMBIENT OPERATION IN HEATING MODE DOWN TO -15°C (OPTIONAL)

The unit is able to work to work even in extreme low outdoor temperature conditions thanks to the low ambient kit (optional). With
this option, the operating map is extended to an ambient temperature of -15°C.
The unit is also equipped with an advanced controller with a dedicated logic developped by Trane for the Defrost system, called
DIGITAL DEFROST, a very efficient defrost logic able to optimize and reduce the number of defrost cycles.
Differently from traditional defrost system, using a fixed limit of evaporation temperature, the DIGITAL DEFROST TECHNOLOGY
is based on a smart algorithm that allow to:
-minimize the number of defrosts
-minimize the time of defrost
-minimize the number of unnecessary defrosts
-prevent damages on the coil caused by fast ice formation.
-prevent unit stops due to low pressure alarm in case of fast ice formation.
The algorithm is based on three main variables:
-outdoor air temperature
-evaporation temperature
-time
and four main thresholds:
-“warning defrost threshold”
-“defrost activation threshold”
-“rapid unloading threshold”
-“forced defrost threshold”
The algorithm follows 5 basic PHASES:
PHASE 1: if the evaporation temperature drops below the “warning defrost threshold”, the controller starts counting until a time
interval is reached (“waiting time”).
PHASE 2: according to the outdoor air temperature value, a variable “defrost activation threshold” is specified (function of the
outdoor air temperature) which indicates the real presence of ice on the coil.
The advantage of having a “defrost activation threshold” as a function of the outdoor air temperature is to have a reliable
prediction about the real ice presence on the coils, minimizing the probability that the defrost is performed even if it is not really
needed.
PHASE 3: at the end of the “waiting time”, if the evaporation temperature drops below the “defrost activation threshold”, the
defrost is activated. The “waiting time” allows to avoid a high and useless number of defrost cycles.
PHASE 4: If the evaporation temperature keeps dropping down, due to an unexpected icing of the coil (before that the “waiting
time” is reached) so as to overcome the “rapid unloading threshold”, the controller activates a forced part load of the circuit in
order to increase the evaporating temperature.
The advantages of this control are: delay the defrost activation and minimize unnecessary defrost cycles in case of transient
operation of the circuit;
PHASE 5: If the evaporation temperature is still quickly dropping down due to an unexpected icing of the coil (before that the
“waiting time” is reached) so as to overcome the “forced defrost threshold”, the controller activates a forced defrost. The

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advantages of this control are: minimize the risk that the unit stops running due to low pressure alarms and minimize the risk of a
coil damage caused by an inefficient defrost.

ELECTRICAL PANEL
Electrical control panel made in accordance with CEI 44-5/EN 204-2 standards, with short circuit current of 10kA, mounted inside
the unit, includes:
-safety-locked main switch;
-fuses and contactors for compressor;
-fuses and contactors for the fans;
-fuses 220V auxiliary circuit;
-fuses 24V auxiliary circuit;
-transformer for 24Vac auxiliary circuit power supply;
-low-voltage user terminals board.

ELECTRONIC CONTROLS
The control of the unit is performed by an electronic card for dynamic parameters control, able to control independently the
functionalities and to adjust the operating cycles of the unit.
The controller interface consists of a 2 line LED display and of several icons for quick interaction, interaction with the control is
possible with six buttons on the sides of the display.
Through the monitoring system the user can intervene and regulate through the setting of appropriate parameters, the following
settings:
-selection of the cooling fluid temperature control. This is proportional type;
-temperature set point of the cooling fluid entering the evaporator and relevant differential, for controlling the ramp of the cooled
fluid;
-setting the machine and compressor counter;
-setting the minimum time to re-start a compressor;
-setting the minimum compressor on/off time schedule;
-enabling the compressor start up sequence;
-management of the on/off period of the pump on starting up and shut down of the unit;
-setting the delay time on the water differential pressure switch;
-setting the set point and differential for the management of the card controlling the speed of the connected fans.
Safety features include:
-high and low pressure switches;
-compressor, fans thermal protection;
-electric pump thermal protection;
-protection against a lack of low flow in the heat exchangers;
-freeze protection;
-modification of the operating time of the individual compressors;
-EPROM not correctly connected or not operating correctly self diagnosis;
-probe failure or not connected self diagnosis.
The alphanumerical LED display allows the parameters to be easily entered. Alarms and the functional parameters are displayed
immediately.
The control interface provides:
-Monitor the analog state variables of the system (in/out water temperature, pressures on each circuit);
-Monitor the state of the compressors, capacity control valves, heaters etc.;
-Read the text and the code of the occurred alarm;
-Activation of the machine in the desired operating mode;
-Modify operating parameters by inserting the right password;
-Defrost timings;
-Antifreeze threshold
Using the terminal with 6 keys and LED graphic display one can manage:
-change the set point of the whole unit:
-monitor the analog state variables of the system (in/out water temperature, pressures on each circuit);
-monitor the state of the compressors, capacity control valves, heaters etc.;
-read the code of the occurred alarm;
-turn on/off the whole unit and change its mode (summer/winter for the heat pumps);
-"modify the following parameters by inserting the right password:
- high/low pressure;
- on/off compressors timings;
- defrost timings (for the heat pumps);
- antifreeze threshold;
- condensation control law as a function of the instantaneous high pressur

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There are two types of alarm:

-serious alarms that deactivate the unit, give a text alarm on the display, activate the buzzer and the general alarm output relay
fitted. They are:
- no water flow across the evaporator;
- high/low pressure;
- compressor thermal protection;
- fans thermal
-signal-only alarms: they only give a signal text on the display and activate the buzzer and the general alarm output relay fitted on
the master card. They are:
- compressor maintenance time over limits;
- water pump maintenance time over limits.
By contacts (included) in the control panel you can manage the unit in its basic functions in BMS:
-remote on/off selection;
-remote summer/winter selection (for the heat pump versions);
-additional water flow control (external flow switch);
-on/off compressors status.
The electronic controller can be interfaced with a supervision software on a local or remote PC that uses a manufacturer:
communication protocol, or with complex BMS systems using ModBus.

Additional function for unit equipped with advanced electronic controller (standard with low
ambient temperature kit in heating mode)
-Complete alarm management, alarm history and data logger which records and stores the principal variables and the operating
status of the unit for about 4 days.
-ModBus master and slave communication protocol, ability to interface with the main BMS systems via RS485.
-Input Ethernet RJ45, for routing on the web of all the parameters of the unit, providing a total remote control of unit.
-USB input to download parameter files, system files, firmware and to upload files of historical alarms, residing parameters files
and default parameters files
-Automatic summer/winter changeover according to the outdoor temperature.
-Continuous adjustment of the set point by time bands both with direct and reverse direction logic (Energy Saving);
-Smart defrost management according to the coil approach.
-auto-power on-off of the unit using time slots.

DYNAMIC LOGIC CONTROL

Thanks to the function DYNAMIC LOGIC CONTROL, the electronic controller can manage the differential of the inlet water
temperature on the basis of the speed of its variation.
The function dLC works partially as a simulator of a water tank: in fact it allows to reduce the number of the compressor’s starts.
The main advantage of the function dLC is during the conditions of low load, that is:
-the compressor is switched off and the water temperature increases very slowly; in this situation the dLC is able to delay the start
of the compressor by replacing itself to the thermal inertia that would be obtained from the water tank.
-the compressor is switched on and the water temperature decreases very quickly; in this situation the dLC is able to delay the
compressor’s switching off. In this way it is reached the same result that would be obtained from the water tank’s thermal inert
As result the function dLC makes possible to reduce the dimensions of the water tank, with huge advantages for the footprint of
the unit.

DYNAMIC SET POINT

The function DYNAMIC SET POINT allows to change simultaneously the set point to achieve always the conditions of best
comfort and, above all, the maximum energy saving. In fact if the outdoor temperature increases, through the function DSP it is
possible:
-To increase of a certain value the set point in case it is necessary to reduce the power consumption and it is needed to ensure a
difference between the indoor and outdoor temperature such to avoid health problems due to the excessive changes of
temperatu
-To reduce of a certain value the set point in case it is required to compensate in such a way the excess of thermal load</br> of
course this is a function to be used with precaution because it generates higher power consumptions and a big difference in
temper

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ACCORDING TO EN14511
Unit CXB 036 A
Model 036
Refrigerant fluid R410A
Minimum partialization of the unit % 50
Compressors
Type SCROLL
Number 2
Refrigerant ciruits 1
Capacity steps 2
Total oil charge kg 3.5
Total refrigerant charge kg 15.0
Fans
Type SRC
Number 2
Rated absorbed power per single fan kW 0.2
Rated absorbed current A 0.6
Heat exchanger - User side
Type PL
Number 1
Water content l 0.0
Dimensions
Lenght mm 2061
Width mm 779
Height mm 1687
Weight
Net weight kg 396.0
Hydraulic module - User side
Number of pumps 1
Rated absorbed power per single pump kW 0.85
Rated absobed current A 1.6
Storage tank l 100.0
Cooling conditions
Fluid - User side Water
Fouling factor - User side m² °C/kW 0.0000000
Inlet water temperature - User side °C 12.00
Outlet water temperature - User side °C 7.00
External air temperature °C 35.00
Height asl m 0
Cooling performances
Cooling capacity kW 31.06
Compressors absorbed power kW 13.53
Total absorbed power (A1) kW 14.00
Flow rate - User side m3/h 5.34
Pressure drops - User side kPa 19.5
EER 2.22
Prated.c 31
ns.c % 120
SEER 3.07

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Air flow rate m3/h 10400

Available external static pressure Pa 0
Fans absorbed power kW 0.24
Fans absorbed current A 0.55
Sound levels
Sound power (ISO 9614) dB(A) 78
Sound Level pressure at 1 m dB(A) 61
Sound Level pressure at 5 m dB(A) 52
Sound Level pressure at 10 m dB(A) 46
Sound Level pressure at 20 m dB(A) 41
Hydaulic module - User side: Cooling mode
External available static pressure kPa 224.18
Pumps absorbed power kW 0.9
Pumps absorbed current A 1.6
Heating conditions
Inlet water temperature - User side °C 40.00
Outlet water temperature - User side °C 45.00
External air temperature °C 7.00
External Relative Humidity % 87
Wet-bulb temperature °C 6.00
Heating performances
Heating capacity kW 39.6
Compressors absorbed power kW 11.5
Total absorbed power (A1) kW 12.0
Flow rate - User side m3/h 6.78
Pressure drops - User side kPa 27.4
COP 3.30
Prated.h 35
ns.h % 149
SCOP 3.80
Air flow rate m3/h 10400
Available external static pressure Pa 0
Fans absorbed power kW 0.24
Fans absorbed current A 0.55
Hydaulic module - User side: Heating mode
External available static pressure kPa 159.30
Pumps absorbed power kW 0.9
Pumps absorbed current A 1.6
ELECTRICAL DATA (Theoretical calculations)
Power supply V/ph/Hz 400/3+n/50
Electrical performances
FLI kW 13.8
Full load current - FLA A 23.1
SA A 113.1
Maximum starting current - LRA A 101.0
FLI Max kW 17.4
FLA Max A 31.1
SA Max A 117.1

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Sound 63 [Hz] 125 [Hz] 250 [Hz] 500 [Hz] 1000 [Hz] 2000 [Hz] 4000 [Hz] 8000 [Hz]
Level
Lw [dB] 87 83 79 75 72 70 64 59 Lw_tot dB(A) 78
Lp [dB] 56 52 47 43 41 38 32 27 Lp_tot dB(A) 46
(A1) Compressor, fans and pumps power

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Technical data and dimensions are not binding. The company reserves the right to make necessary
changes without notice.
Technical data are referred to clean coils without fouling and do not consider the defrost cycles duty.
Refrigerant and oil charges are not binding, please check the effective values shown on unit nameplate.
The minimum and maximum water flow limitations for the heat exchanger can be checked in the technical
literature.
The declared performance refers to basic units at an altitude of 0 meter above sea level; some options
may affect the performance of the unit. The use of appropriate correction factors is required to calculate
performance if the following options are selected:
- hydraulic kits;
- special coils and/or special coating on coils;
- condensing/evaporating control devices;
- EC fans;
- Low ambient temperature kit;
- Low water temperature kit;
- Additional refrigerant circuit components (e.g. compressor suction service valve);
- High leaving hot water temperature module.
Standard hydraulic versions can operate with a maximum glycol percentage of 25%. Please contact our
sales support for the quotation of hydraulic kits suitable for operation with a glycol percentage higher than
25%.
Performance tolerances at other conditions from the full load test conditions, as defined in EN Standard
14511-3:2018, are different and need to be checked. Please contact sales support, also in case a
performance test is needed at different conditions than those defined in EN Standard 14511-3:2018 (valid
for chillers, heat pumps and multi-pipe units).
Hydraulic and electrical data shown are calculated in cooling only mode.
FLI = Full load power input at the conditions of the selection
FLA = Full load current at the conditions of the selection
SA = Inrush current (sum of LRA of the largest compressor, current of the other compressors, total current
of the fans)
LRA = Locked rotor amperes for the largest compressor
FLImax= Full load power input at the worst conditions for compressors and fans (at the limit of the unit
operating envelope)
FLAmax= Full load current at the worst conditions for compressors and fans (at the limit of the unit
operating envelope)
Samax= Inrush current (sum of LRA of the largest compressor, current of the other compressors
calculated at the worst conditions, total current of the fans).
Acoustic data refer to basic units without hydraulic version at the following operating conditions:
evaporator water temp. In/out 12°/7°C - outdoor temp. 35°C.
Correction factors of sound power and sound pressure levels are available on the technical bulletin.
The sound pressure levels are average values calculated in free field with a reflective surface and …and
they are indicative
The sound power and sound pressure values are A-weighted [dB(A)]
The values shown in each octave band are indicative and represent sound pressure levels at 5 or 10 m
unweighted dB(A).

FOR HEAT PUMPS: the selection of the fixed speed water pump shall be made in accordance to the
water flow in cooling mode. In heating mode the unit will work with the same water flow as in cooing but
with consequent variation of the delta T respect to the one of the datasheet.
FOR MULTI-PIPE UNITS:
The selection of the fixed speed water pump on the cooling side shall be made in accordance to the water
flow in cooling only mode. In chiller + total recovery mode (cooling + heating) the unit will work with the
same water flow as in cooling only mode but with consequent variation of the delta T respect to the one of
the datasheet. Unit controls on the entering cold water temperature.
The selection of the fixed speed water pump on the heating side shall be made in accordance to the water
flow in heating only mode. In chiller + total recovery mode (cooling + heating) the unit will work with the
same water flow as in heating only mode but with consequent variation of the delta T respect to the one of
the datasheet. Unit controls on the entering hot water temperature.

The TER (Total Efficiency Ratio) is the ratio between the sum of the heating and cooling capacity divided
by total compressors power input, in chiller + heat recovery mode. TER reaches the maximum value when
the heating and cooling loads are fully balanced. TER objectively defines the efficiency of a multi-pipe unit
according to simultaneous load requirement.

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Pump diagram - User side

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Selected accessory:
1: Hydraulic module with water pump
2: Water tank supplied loose
3: Communication card RS485
4: Flow switch
5: Over/under voltage + phase failure protection relay
6: EC Fans

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