CWS 600 x 600 with AC fan motor (Sizes 00 - 01 - 02 - 03) CWS 800 x 800 with AC fan motor (Sizes 04 - 05 - 06) CWE 600 x 600 with EC fan motor (Sizes 01 - 02 - 03) CWE 800 x 800 with EC fan motor (Sizes 04 - 05) Chilled Water Ceiling Cassettes UNT-PRC011-E4
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CWS 600 x 600 with AC fan motor(Sizes 00 - 01 - 02 - 03)
CWS 800 x 800 with AC fan motor(Sizes 04 - 05 - 06)
CWE 600 x 600 with EC fan motor(Sizes 01 - 02 - 03)
CWE 800 x 800 with EC fan motor(Sizes 04 - 05)
Chilled Water Ceiling Cassettes
UNT-PRC011-E4
Contents
UNT-PRC011-E42
Introduction 4
Main components 5
Intake grill and air distribution 5
Casing 5
Control panel 5
Fan assembly 5
Heat exchanger 5
Condensate collection tray 5
Air filter 5
Condensate pump 5
General data 6
Performance data - 2-Pipe 8
Cooling capacity 8
Heating capacity 9
Performance data - 4-pipe 10
Cooling capacity 10
Heating capacity 11
Correction factors for cooling capacities 12
Sound levels 12
Water pressure drop 13
Working conditions 13
Dimensions 14
Weights 16
Air throw 17
Contents
3UNT-PRC011-E4
Fresh air inlet 18
Air distribution 20
Controls 21
Thermostat N - AC fan motor 22
Thermostat P - AC fan motor 23
Thermostat R - AC fan motor 24
Thermostat T - AC fan motor 25
Thermostat U - AC fan motor 26
Unit for field-installed control - EC fan motor 29
Electronic control EC V-type thermostat and W-type
remote infra-red control 30
RT03/ECM-IR remote control - EC fan motor 31
Options 32
Main functions of the remote control 32
Intelligent LonTalk® ZN523 control 33
Intelligent LonTalk® ZN525 control 34
Units with electric heater - AC fan motor 35
Accessories 38
Features for R, T, U and V, W wall controllers 38
REL1 Relay card for master/slave configuration -
AC fan motor 39
REL2 for U-type - AC fan motor 40
ETN/ECM control (wall-mounted control) - EC fan motor 41
MWT (Minimum Water Temperature) sensor 42
Infra-red remote control with receiver W-type
RT03/ECM-IR EC fan motor 43
Fresh air connection 44
Fresh air kit 44
On/off valves with hot wax actuator 46
Introduction
UNT-PRC011-E44
Innovating and beautiful design,seven different sizes, high controlflexibility and easy maintenance:the Trane chilled water cassette isthe result of an extended technicaland design development aimed atachieving the highest level in termsof performance, silent operationand control possibilities.
The air diffuser has a highlyattractive aesthetical appearance,very innovative, and is also able tooffer the best air distributionperformance thanks to longcomputer studies and laboratorytests.
The standard color is RAL 9003;other colors are available onrequest.
The smaller sizes are designed to fitinto 600x600 mm false ceilingstandard modules. The bigger sizeshave a dimension of 800x800 mmwhich allows the best outcome interms of sound levels and ofprice/performance ratio for thesehigh capacity models.
Units can be supplied withElectronically Commutated fan
motors, which mean:• 76% energy savings• New electronic controllers with
wall thermostat or infraredremote control.
• Variable speed ventilation whichavoids shifts in sound levels bymodulating the fan speed to theexact operating needs.
Every unit can be supplied with1 coil (2-pipe system) and a possibleelectric heater or with 2 coils (4-pipesystem). Each model can have freshair intake and a remote air diffusercan be connected to the unit.
The condensate pump integratedinto the unit as standard, is veryquiet and has a maximum head of650 mm.
In addition to the temperature andspeed standard controls, automaticspeed selection is also available.More than one unit can beconnected to a single control, andthe unit control panel is installed ina position that facilitates themaintenance operation. Every unitcan also be operated by the meansof an infra-red remote control. Thecassettes can also be connected tothe most common automaticbuilding management systemsthanks to the Trane ZN LonTalk®
control.
A factory-mounted and tested 2-way or 3-way valve kit can beproposed to save time on the jobsite.
Main components
5UNT-PRC011-E4
Intake grill and air distribution
Intake grills, frame and adjustableair distribution louvers on eachside, made of ABS in RAL 9003color. Adjustable louvers allow aCoanda effect when oriented 30°.
Casing
Made of galvanized steel with insidethermal insulation (closed cellpolyethylene 10 mm thick) andoutside anti-condensate lining.There are three Ø105mm fresh airinlet locations, and one Ø150mm(size 01-02-03) or Ø180mm (size 04-05-06) outlet to air condition anadjacent room.
Control panel
Made of an external box and theterminal board of the controlelectronic board is easily accessible.
Fan assembly
The fan assembly mounted on anti-vibrating supports is extremelyquiet. The single air inlet radial fanis connected to a 6-speed electricmotor with:• single phase 230V/50Hz supply; • class B insulation; and, • an integrated Klixon thermal
contact for the overheatprotection.
The units are supplied with3 standard wired speeds and it ispossible to change them on site ifnecessary.
Both AC and EC (electronicallycommutated) fan motors areavailable.
Heat exchanger
Made of copper tubes andaluminium fins bonded onto thetubes for maximum transfercontact.½" water connections (when novalve), low water pressure dropsand a maximum operating pressureof 8 bars.
Condensate collection tray
High density ABS polystyrene foamcondensate tray, shaped in order tooptimize the air diffusion, fireretardant rating B2 to DIN 4102.
Air filter
Synthetic washable filter, lowpressure drop and easily removablewithout any tool.
Condensate pump
Integrated float switch centrifugalpump with 650 mm of maximumhead, wired to the control panel onthe outside of the casing. It isequipped with an alarm contact forexternal use.
Table 1 - General data - 2-pipe units - AC fan motor
(*) Lp = The sound pressure levels and Nr values are referred to an installation in a 100m2 room with a reverberation time of 0,5 s
Water pressure drop
13UNT-PRC011-E4
Water pressure drop for averagewater temperature of 10°C incooling and 65°C in heating. Forother temperatures, multiply thepressure drop figure by the Kcorrection factors below the graph.
The air throw indicated in the tablesmust only be considered as themaximum value, as it may changesignificantly depending on thedimensions of the room in whichthe unit is installed and thepositioning of the furniture in theroom.
The useful throw L refers to thedistance between the unit and thepoint where the air speed is0.2 m/sec; if the louver has agradient of 30° (recommended incooling mode), the so-called"Coanda" effect will occur,illustrated in Figure 6, while at agradient of 45° (recommended inheating mode), there will be adownwards throw, as illustrated inFigure 7.
Note
In heating mode, you must payattention to rooms where the floortemperature is particularly low (forexample less than 5°C). In thissituation the floor can cool thelower layer of air to a level that stopthe uniform diffusion of the hot aircoming from the unit, decreasingthe throw figures shown in thetable.
Figure 8 - With adjustable air diffusion louvers at 30°
Figure 9 - With adjustable air diffusion louvers at 45°
The unit is fitted with inlets for freshair to be mixed with return airinside the unit. The fresh airflow islimited to 20% of the total fan coilairflow at medium speed and100 m3/h for each treated air inlet.
The units feature fresh air inlets onthree corners (no inlet on the fourthcorner because of the condensatepump inside the unit).
The fresh air inlets are designed forthe insertion of standard 110 x 55 mm rectangular ducts.
The air duct is connected quicklyand easily. After removing the blankand the insulation inside the unit,the mounting plate is rolled backand the air duct with its V-shapedsection must be pushed into theunit. The duct is then fixed to themounting plate.
Note: Fresh air must be filtered.
Figure 10 - Air flow
1 = Air distribution2 = Main air inlet3 = Air intake
Fresh air inlet
19UNT-PRC011-E4
Figure 11 - Fresh air inlet positions
Figure 12 - Fresh air connection installation
1 = Fresh air connection "FAC" (Please refer to "Accessories" section)
Two air outlets are provided on theside of the unit for connection toseparate supply air outlets.
They can be used to supply air fromthe fan coil unit to distant areas of aroom or even to a different room.The total airflow does not change.The air flow at high speeddepending on the air duct pressuredrop is shown in the tables below.
Note: All air ducts must beinsulated in order to avoidcondensation.
Air distribution
UNT-PRC011-E420
Figure 13 - Airflow at high speed
1 = 1 outlet used2 = 2 outlets used
Controls
21UNT-PRC011-E4
Several choices of electro-mechanical and electronic controls are available.
Table 17 - Thermostat use summary
S/W: Summer/Winter(1) Application possible only if the unit is connected to a reversible unit and the maximum entering water temperature is 45°C in
heating mode.
Fan running continuously
Control
options
Thermostats
Accessories
Fan cycling
on/off
(no valve)
2-pipe
cooling
2-pipe
heating
2-pipe
changeover
2-pipe
cooling +
electric
heater
2-pipe
changeover
+ electric
heater
4-pipe
Automatic
fan speed
selection
Minimum
water
temperature
sensor
Digital
display
Economy
mode
Master /
slave
configuration
Window
sensor
Modulating
valve
BMS
integration
Electro-mechanical
AC
N type X X
XManual w/accessory
sensor
XManual
w/accessory
sensor
XManual
localREL1
P type X X
XAutomatic
w/accessory
sensor
XAutomatic
w/accessory
sensor
XAutomatic
w/accessory
sensor
XAutomatic REL1
R type X X
XAutomatic
w/accessory
sensor
XAutomatic
w/accessory
sensor
XAutomatic
XAccessory REL1
T type X X X
XManuallocal or
remote w/accessory
sensor
XManuallocal or
remote w/accessory
sensor
XAutomatic X X
Accessory REL1
ElectronicAC
U type X X X
XManuallocal or
remote w/accessory
sensor
XManuallocal or
remote w/accessory
sensor
XAutomatic X X
Accessory X X REL2
Infraredremote
control ACX X X
XManual w/accessory
sensor
XAutomatic X X X
Electronic AC ZN523
ZSM10 X X X X X X X X X Serial link X X X
ZSM11 X X X X X X X X X X Serial link X X X
ZSM31Radio X X X X X X X X X X Serial link X X X
Fieldinstalled
control EC
Customercontrol X X X X
ElectronicEC 0-10V
V type X X X XManuel
XAutomatic X X X
Serial linkRS485
20 unitsX
W typeInfra Red X X X X
Manuel X
Automatic X X XSerial link
RS48520 units
X
Electronic EC ZN525
ZSM10 X X X X X X X X X Serial link
ZSM11 X X X X X X X X X X Serial link X X X
ZSM31Radio X X X X X X X X X X X Serial link X X X
Controls
UNT-PRC011-E422
Thermostat N - AC fan
motor
CONTROL WITH
ELECTROMECHANIC THERMOSTAT
Figure 14 - Thermostat N
Main characteristics:
- On/off switch.
- Manual speed switch.
- Manual Summer/Winter switch.
- Electromechanic thermostat forvalve(s) control (ON-OFF) (the fanis running continuously).
- It allows control of the chilledwater valve (ON-OFF) and theelectric resistance.
SEC1 = CWS technical sheet
''N'' type = Control technical sheet
SB = Alarm contacts
Y1 = Chilled water valve set
Y2 = Hot water valve set
AL = Alarm condensate - floatswitch released
Example: "N" thermostat with two valves
Controls
23UNT-PRC011-E4
Thermostat P - AC fan
motor
CONTROL WITH
ELECTROMECHANIC THERMOSTAT
Figure 15 - Thermostat P
Main characteristics:
- On/off switch.
- Manual speed switch.
- Automatic Summer/Winterchange-over.
- Electromechanic thermostat forvalve(s) control (ON-OFF) (the fanis running continuously).
- It allows control of the chilledwater valve (ON-OFF) and theelectric heater.
SEC1 = CWS technical sheet
''P'' type = Control technical sheet
SB = Alarm contacts
Y1 = Chilled water valve set
Y2 = Hot water valve set
CO = Automatic changeover pipethermostat
AL = Alarm condensate - floatswitch released
Example: "P" thermostat with one valve
Controls
UNT-PRC011-E424
Thermostat R - AC fan
motor
CONTROL WITH ELECTRONIC
THERMOSTAT
Main characteristics:
- Manual speed switch.
- Manual Summer/Winter switch.
- Electronic thermostat for fancontrol (on/off).
- Electronic thermostat for valve(s)control (on/off) (the fan is runningcontinuously).
- It allows control of the minimumwater temperature sensor (MWT).
- It allows control of the chilledwater valve (on/off) and theelectric resistance in the CWS-Eversion.
- It allows installation of theSummer/Winter switch centralizedand remote, or to control it with anautomatic change-over fitted onthe water pipe (for 2 pipeinstallations only). The latter caseneeds the adjustment of thejumper on the control board (seethe instruction leaflet suppliedwith the control).
SEC1 = CWS technical sheet
SET2 = Control technical sheet
S1 = Alarm contacts
Y =Valve set (2 pipe installation)
Y1 = Chilled water valve set
Y2 = Hot water valve set
AL = Alarm condensate - floatswitch released
Example: "R" thermostat with 2 valves
CWS
AL
Controls
25UNT-PRC011-E4
Example: T thermostat with 2 valves
AL
CWS
Thermostat T - AC fan
motor
CONTROL WITH ELECTRONIC
THERMOSTAT
Main characteristics:
Same characteristics as the Rcontrol, adding:
- Manual or automatic speed switch.
- Electronic thermostat for fancontrol (on/off).
- Electronic thermostat for valve(s)control (on/off).
- Simultaneous thermostatic controlon the valves and fan (on/off).
- It allows installation of theSummer/Winter switch centralizedand remote, or to control it with anautomatic change-over fitted onthe water pipe (for 2 pipeinstallations only). The last caseneeds the adjustment of thejumper on the control board (seethe instruction leaflet suppliedwith the control).
Note: With 4 pipe installations andcontinuous chilled and hot watersupply, it allows the automaticsummer/winter change-over inaccordance to the roomtemperature (-1°C = Winter, +1°C = Summer, Dead Zone 2°C).
SEC1 = CWS technical sheet
S1 = Alarm contacts
Y =Valve set (2 pipe installation)
Y1 = Chilled water valve set
Y2 = Hot water valve set
AL = Alarm condensate - floatswitch released
UNT-PRC011-E426
Thermostat U - AC fan
motor
CONTROL WITH ELECTRONIC
THERMOSTAT
Main characteristics:
- Manual or automatic speed switch.
- Manual or automaticSummer/Winter switch.
- Electronic thermostat for fancontrol (on/off).
- Electronic thermostat for valve(s)control (on/off).
- It allows to control the minimumwater temperature sensor (MWT).
- It allows to control the chilledwater valve (on/off) and theelectric resistance in the CWS-Eversion.
- It allows to control the fan and theheating electric resistance.
- It allows to control up to 10 unitswith the REL2 relay board.
Note: with 4 pipe installations andcontinuous chilled and hot watersupply, it allows the automaticsummer/winter change-over inaccordance to the roomtemperature (-1,6°C = Winter, +1,6°C= Summer, Dead Zone 3,2°C).
SEC1 = CWS technical sheet
MWT = Minimum WaterTemperature sensor
TR = Transformer
Y =Valve set (2 pipe installation)
Y1 = Chilled water valve set (4 pipe installation)
Y2 = Hot water valve set (4 pipe installation)
R = Slave board
SB = Alarm contacts
IN1 = Winter/Summer remoteswitch
IN2 = Set reduction
Led DL1 Red = Shows incorrect datatransmission
Led DL2 Green = Shows correctdata transmission
Controls
Controls
27UNT-PRC011-E4
Example: "U" thermostat with 2 valves - AC fan motor
1. Relay card. REL 2 if slave(s)
Example: "U" thermostat with one valve - AC fan motor
1. Relay card. REL 2 if slave(s)
Note: The power unit has to be installed into the control panel of the unit .
1
POWER UNIT for U
RMWT
TR
SEC1
SB
IN2 IN1 N PE L
AL
Y
1MWT
POWER UNIT for U
R
TR
SEC1
SB
IN2 IN1 N PE L
AL
Y2Y1
UNT-PRC011-E428
Controls
Figure 16 - CWS grille with infra-red receiver for units with AC fan motor
The electronic board, fitted insidethe electrical panel, can managedifferent control modes so as tobest satisfy the requirements of theinstallation. These modes areselected by suitably positioning theconfiguration dipswitches, whichdefine the following main functions:
• Operation without / with remotecontrol:dip switch N.ro 3 = ON/OFF
• Continuous ventilation:dip switch N.ro 4 = ON
• Close valve and stop fan incooling (autofan function):dip switch N.ro 4 = OFF N.ro 5 =ON N.ro 6 = OFF
• Close valve and stop fan inheating mode (autofan function):dip switch N.ro 4 = OFFN.ro 5 = OFF N.ro 6 = OFF
• Close valve and stop fan in bothcooling and heating mode(autofan function):dip switch N.ro 4 = OFF N.ro 5 =ON N.ro 6 = ON
The autofan function allows thesimultaneous on/off control of thewater valve and the fan, while atthe same time optimising theoperation of the unit. Whenreaching the set point, thecontroller closes the water valve(valve off) and only 3 minutes laterstops the fan, so as to correctlycompensate for the valve closingtime. To prevent the air probe frommeasuring an incorrect temperaturewhen the fan is off, the controllerruns a number of fan ON cycles toannul the effect of any stratificationof the air in the room.
29UNT-PRC011-E4
Controls
Unit for field-installed
control - EC fan motor
For this cassette configuration, the1-10 Vdc signal, which controls theinverter, must be supplied by acontroller with the following signalspecifications: • Impedance < 100 Ω; • Maximum speed 10Vdc; • Fan OFF with V < 0.9Vdc.
Table 18 - EC voltage range - without electric heater
RPM range is a built-in feature fo the CWE BLAC control card. It cannot bechanged, thus any 0-10V controller can operate the unit without violatingthe RPM range.
Speed Low speed Med speed High speedVoltage 1V 5V 10V
This version is supplied integralwith the ECM-IR electronic boardthat supplies the 0-10V signal to theinverter board, in accordance to theinstructions received by the wallcontrol (ETN/ECM model) or theinfra-red remote control (RT03/ECMmodel).The cassettes can becontrolled as stand-alone,master/slave or in serial connection.With the dip switches on the ECM-IR board, it is possible to choosethe following working modes:
• Close valve and stop fan incooling (autofan function): dip switch N.ro 4 = OFF N.ro 5 = ON N.ro 6 = OFF
• Close valve and stop fan inheating mode (autofan function): dip switch N.ro 4 = OFF N.ro 5 = OFF N.ro 6 = OFF
• Close valve and stop fan in bothcooling and heating mode(autofan function): dip switch N.ro 4 = OFF N.ro 5 = ON N.ro 6 = ON
The autofan function allows thesimultaneous on/off control of thewater valve and the fan, while atthe same time optimising theoperation of the unit. Whenreaching the set point, thecontroller closes the water valve(valve off) and only 3 minutes laterstops the fan, so as to correctlycompensate for the valve closingtime. The autofan function can beactivated in cooling only mode, inheating only mode or in bothoperating modes. In two pipesystems, a water probe can beinstalled on the supply pipe to theunit upstream of the water valve.Based on the temperature read inthis section of the pipe, the devicewill select either cooling or heatingoperation. The electronic board alsofeatures a contact for connection toa window switch or remoteenabling signal. When the contactis closed, the unit can operate,when the contact is open, the unitstops. The same contact can beused for starting and stopping theunit from an external timer or anyother remote switching device. Inaddition, a series of units can beswitched on or off at the same time,by using a flip-flop switchconnected to the terminals presenton the board (F1 - 12V).
Sensors that require a 12 voltpower supply, for exampleoccupancy sensors, can beconnected to other terminals on theelectronic board and then to theon/off contacts. The board is able topower external sensors with amaximum current of 60mA.
ECM-IR = Control boardBLAC = Inverter boardM = Electronic motorE = Valve set (2 pipe installation)E1 = Hot water valveE2 = Chilled water valveTME = Low temperature cut-outthermostatSA = Air probe
Accessories
31UNT-PRC011-E4
RT03/ECM-IR remote
control - EC fan motor
The RT03/ECM-IR is a remotecontroller handset that can be fittedwith the ECM-IR electronic board asan accessory. There is a remotesensor to install on site and someconfiguration dipswitches to turnon. It is possible to connect up to20 units with a serial link RS485 fora master/slave configuration. It isrecommended to install the infra-red receiver on the masterunit.
Figure 17 - Infra-red remote control
Note
For more details, please refer to theinfra-red remote control manual.
Control operations
- Temperature set.
- Fan speed switch with possibleautomatic speed selection.
- 24 hours on/off program.
- on/off cooling valve control.
- on/off heating valve control.
- Control of the valves only or of thevalves and the fan together.
- Valve control of 2 or 4 pipesystems with winter/summerswitch on the infra-red control.
- Valve control of 4 pipe systemswith automatic heating/coolingmode selection with 2°C deadzone.
- Activating the COE sensorconnected to the T2 contact of theboard (non active in the standardconfiguration), it works like aminimum water temperaturesensor: fitted between the coil finsit stops the fan when the watertemperature is lower than 38°Cand it starts the fan when thewater temperature reaches 42°C.
Options
UNT-PRC011-E432
Main functions of the remote control
Figure 18 - Remote control display
1. Clock : 24 hours2. Timer : the program switches the device on and off3. Displays the temperature setpoint4. Fan speed setting: 3 speed plus automatic selection5. Operating mode: heat, cool, fan only plus and automatic mode selection.
Timer function:
Used to start or stop the unit over a12 hour period.
Set display:
Used to display the temperature setpoint.
Fan speed setting:
Used to select the 3 operatingspeeds of the fan, or alternativelyselect automatic control. In thelatter case, the fan speed willchange automatically based on theambient temperature reading andthe set point. The temperaturedifference to switch from one speedto the next is 0.7 °K.
Operating mode:
Used to select the desired operatingmode, that is, fan only, cooling,heating or automatic modeselection.
Automatic selection allows, in4 pipe systems, the unit to switchautomatically from heating tocooling and vice-versa based on theambient temperature reading andthe set point, with a dead zone of2°K inside which the unit remains infan only mode.
Options
33UNT-PRC011-E4
Intelligent LonTalk® ZN523
control for AC fan motor
The Tracer® ZN unit controller is amicro-processor based direct digitalcontroller that is dedicated to thecontrol and the optimization of theunits. It is designed to provideimproved comfort with minimumenergy consumption through theuse of custom proportional integralderivative (PID) control algorithmsas well as intelligent fan speed andset point control strategies. It isfactory installed, pre-commissionedand tested, resulting in a highlyintegrated product, reducedinstallation and commissioningtime.
The following configurations aresupported by the controller:
- 2-pipe cooling;
- 2-pipe heating;
- 2-pipe cooling + electric heater;
- 2-pipe changeover (manual orautomatic);
- 2-pipe changeover + electricheater;
- 4-pipe.
Figure 19 - LonTalk® ZN523 control
The intelligent control offers thefollowing benefits:• Intelligent management of valve
position and fan speeds. Valve isfully open before changing thefan speed (acoustic comfortoptimization).
• Control algorithms based onambient and discharge airtemperatures.
• Discharge air temperature (lowand high limit control).
• Automatic intelligent changeoverbased on ambient air - enteringwater temperatures differential(+/-%2.5K).
• Automatic intelligent changeoverwith sampling function for 2-wayvalves use.
Figure 20 - Normal operating mode
1. Control output2. Unoccupied heating setpoint3. Occupied standby heating setpoint4. Occupied heating setpoint5. Dead band6. Local setpoint7. Occupied cooling setpoint8. Occupied standby cooling setpoint9. Unoccupied cooling setpoint10. Temperature
For more details about theLonTalk® ZN control, please refer tothe controller's manual.
• Filter timer for preventivemaintenance
• Adjustable local set point max -min limits.
• Built-in electrical protection.• 2 operating modes in stand-alone
application: comfort and reduce.• After a power up in the building,
units automatically staggeredfrom 5 to 32 seconds.
• Built-in adjustable timed overridefunction.
• Built-in condensate overflowprotection.
• Built-in output test capability.• Built-in diagnostic indicator.
UNT-PRC011-E434
Options
Intelligent LonTalk® ZN525
control for EC fan motor
The Tracer® ZN unit controller is amicro-processor based direct digitalcontroller. ZN525 is dedicated tocontrol units equipped with ECmotor. Controller is designed toprovide improved comfort byreducing cassette sound level withminimum energy consumptionthrough the use of customproportional integral derivative(PID) control algorithms as well asintelligent fan speed and set pointcontrol strategies. It is factoryinstalled, pre-commissioned andtested, resulting in a highlyintegrated product, reducedinstallation and commissioningtime.
The following configurations aresupported by the controller:- 2-pipe cooling;- 2-pipe heating;- 2-pipe cooling + electric heater;- 2-pipe changeover (manual or
automatic);- 2-pipe changeover + electric
heater;- 4-pipe.
Figure 21 - LonTalk® ZN525 control
The intelligent control offers thefollowing benefits:• Intelligent management of valve
position and fan speeds. Valve isfully open before changing thefan speed (acoustic comfortoptimization).
• Control algorithms based onambient and discharge airtemperatures. o Discharge airtemperature (low and high limitcontrol).
• Automatic intelligent changeoverbased on ambient air - enteringwater temperatures differential(+/-%2.5K).
• Automatic intelligent changeoverwith sampling function for 2-wayvalves use.
• Filter timer for preventivemaintenance
• Adjustable local set point max -min limits.
• Built-in electrical protection.• 2 operating modes in stand-alone
application: comfort and reduce.• After a power up in the building,
units automatically staggeredfrom 5 to 32 seconds.
• Built-in adjustable timed overridefunction.
• Built-in condensate overflowprotection.
• Built-in output test capability.o Built-in diagnostic indicator.
Figure 22 - Normal Operating mode
1. Control output2. Unoccupied heating setpoint3. Occupied standby heating setpoint4. Occupied heating setpoint5. Dead band6. Local setpoint7. Occupied cooling setpoint8. Occupied standby cooling setpoint9. Unoccupied cooling setpoint10. Temperature
For more details about theLonTalk® ZN525 control, pleaserefer to the controller's manual.
35UNT-PRC011-E4
Options
Unit with electric heater -
AC fan motor
The CWS 2 pipe models areavailable with an electric heater.The electric heater is controlled inplace of the hot water valve and notas integrated to it.
The resistance is hermeticallysealed and supplied inside thebattery pipes and therefore can beonly factory mounted.
The electric resistance of the CWS00-01-02-03 units are for singlephase 230V supply.
The electric resistances of the CWS04-05-06 units are for single phase230V or three phase 400V supply.
A specific electronic board is fittedin the unit control panel and it isconnected to the resistance and tothe safety thermostat.
When the safety thermostatoperates, it keeps open theresistance supply relays on theelectronic board.
The rearmament is by electricmeans, cutting off the main supplyto the unit.
On the top, a manual resetthermostat prevents the electricheater from overheating.
Unit with electric heater -
EC fan motor
Electric heaters are available on ECmotors only with Trane ZN525controller (CWE 01-2P/02-2P/03-2P/04-2P/05-2P)
Low speed Medium speed High speed
RPM Voltage RPM Voltage RPM Voltage
CWE 01-2P/4P-E15 450 2,6 540 5,0 730 10,0
CWE 02-2P/4P-E25 550 3,5 635 5,0 940 10,0
CWE 03-2P/4P-E25 550 1,6 820 5,0 1225 10,0
CWE 04-2P/4P-E30 290 1,0 370 5,0 475 10,0
CWE 05-2P/4P-E30 290 1,0 470 5,0 688 10,0
Options
UNT-PRC011-E436
Table 19 - Electric heater capacities
Note: The cooling emission of the units is 95% of the emission in tables 3 and 4.
The autofan function can beactivated in cooling only mode, inheating only mode or in bothoperating modes.
In two pipe systems, a water probecan be installed on the supply pipeto the unit upstream of the watervalve.
Based on the temperature read inthis section of the pipe, the devicewill select automatically eithercooling or heating operation.
The electronic board also features acontact for connection to a windowswitch or remote enabling signal.When the contact is closed, the unitcan operate, when the contact isopen, the unit stops. The samecontact can be used for starting andstopping the unit from an externaltimer or any other remote switchingdevice.
In addition, a series of units can beswitched on or off at the same time,by using a flip-flop switchconnected to the terminals presenton the board.
Sensors that require a 12 voltpower supply, for exampleoccupancy sensors, can beconnected to other terminals on theelectronic board and then to theon/off contacts. The board is able topower external sensors with amaximum current of 60mA.
Electronic Change-Over COE
(accessory - 35169507-001)
Suitable for units with infra-redremote control and for V and Wcontrols.
The NTC sensor, if connected to theT2 contact of the board, works likea change-over: fitted in contact tothe supply pipe it controlsautomatically the winter/summerswitch in accordance to the watertemperature.
Figure 25 - Electronic change-over
Accessories
39UNT-PRC011-E4
REL1 Relay card for
master/slave configuration
- AC fan motor
Fitted in the control panel of the(master) cassette, this enables up toeight units to be controlled by thesignal from a single remote controlunit.
- Speed switch (slave).
- It allows control of up to 8 unitswith only one centralizedthermostat using one speed switchfor each unit.
- For controls N, P, R and T.
REL 1
SEC1: CWS technical sheetSB: Alarm contactsY1: Chilled water valve setY2: Hot water valve setAL: Alarm condensate - float switchreleased
Accessories
UNT-PRC011-E440
REL2 for U-type - AC fan
motor
It allows to control up to 10 unitswith only one U centralizedthermostat.
Figure 26 - REL2 connection with 1 valve
REL 2REL 2
POWER UNIT for U
R
SEC1
SB
REL2
TR TR
N PE L N PE L
SEC1SB
AL AL
Y Y
Infrared remote control option - units with AC fan motor
A field-installed infrared remote control with liquid crystal display isavailable.
Accessories
41UNT-PRC011-E4
ETN/ECM control
(wall-mounted control) -
EC fan motor
The ETN/ECM is a wall-mountedcontrol that can be connected tocassettes fitted with the ECM-IRelectronic board. The ETN/ECMcontrol features the followingfunctions:- Switch the unit on and off.- Temperature set.- Fan speed switch with possible
automatic speed selection.- Setting the operating mode.
It can be installed one control percassette, or one control for up to 20cassettes (master/slaveconfiguration) through RS485 seriallink.
It is recommended to install thewall-mounted control on the masterunit.
See Installation-Operation-Maintenance manual for wiringinformation.
Accessories
UNT-PRC011-E442
MWT Minimum Water
Temperature T3 sensor
(35169496-001) - AC fan
motorSuitable for wall thermostats R, T,and U only (not for infra-red remotecontrol). To be fitted between thecoil fins, it is measuring the watertemperature in the coil.
In heating mode, it stops the fanwhen the water temperature islower than 38°C and it starts the fanwhen it is higher than 42°C.
MWT Minimum Water
Temperature T3 sensor -
EC fan motorOn units with EC fan motors, T3sensor is mounted as standardfeature. The function is activated bydip switch configuration 2.
Automatic changeover
pipe thermostat (258 8050)
for units with AC fan
motorsSuitable for wall thermostats N, P,R, T and U only (not for infra-redremote control). Automaticsummer/winter switch to beinstalled in contact with theentering water circuit and beforethe control valve (for 2-pipeinstallations only). The coolingmode is allowed if the watertemperature is below 15°C and theheating mode is allowed if thewater temperature is above 25°C.
1. Blue2. White3. Black
12
3
Automatic changeover pipe thermostat
(35169496-001) for units with EC fan motorsAutomatic summer/winter changeover function is enabled using a watertemperature sensor to be installed in contact with the entering water circuitand before the control valve (for 2-pipe installations only).
The cooling mode is allowed if the water temperature is below 20°C and theheating mode is allowed if the water temperature is above 30°C.
Accessories
43UNT-PRC011-E4
Infra-red remote control
with receiver W-type
RT03/ECM-IR - EC fan
motor
Control operations:- Temperature set.- Fan speed switch with possible
automatic speed selection.- 24 hours on/off program.- on/off cooling valve control.- on/off heating valve control.- Control of the valves only or of
the valves and the fan together.
- Valve control of 2 or 4 pipesystems with winter/summerswitch on the infra-red control.
- Valve control of 4 pipe systemswith automatic heating/coolingmode selection with 2°C deadzone.
Accessories
UNT-PRC011-E444
Fresh air connection (FAC 35169490-001)
To be connected to one of the three fresh air inlets available on thecassette.
This is used to introduce primary air into the cassette from a 100 mmdiameter duct
Fresh air kit
(FAK 600=35169497-001, FAK 800=35169498-001)
Accessories
45UNT-PRC011-E4
This is used to introduce primary airinto the environment directlythrough the diffuser. The kitincludes a flow separator to befitted inside the cassette, and acircular fitting for connection to theflexible system ducting.
The flow of air is sent directly tojust one of the outlet louvers,without passing through the coil.The air flow of fresh air introducedinto the environment depends onthe inlet static pressure.
The diameter of the fitting for sizes1-2-3 is 150mm. The diameter of thefitting for sizes 4-5-6 is 180mm.
Table 20 - Correlation between flow-rate / static pressure
CWS/CWE 00-01-02-03 CWS/CWE 04/05 - CWS 06
m3/h Pa m3/h Pa
80 3 160 3
120 8 200 8
160 15 300 15
200 25 400 25
240 36 500 36
Accessories
UNT-PRC011-E446
On/off valves with hot wax actuator
In order to save time on the job site, on/off 2 way and 3 way valves areavailable as a pre-assembled kits including pipes and connections.
3 Way / 4 ports
V
II I
III
R
M
2 Way / 2 ports
V
R
M
Accessories
47UNT-PRC011-E4
Table 21 - Technical data
Table 22 - Valves characteristics
* maximum pressure difference for valve to close ** external thread, flat seal
Battery
typeModel 2 way valves 3 way valves
Kvsm3/h
∆pmaxkPa *
Valve **connection
Kvsm3/h
∆pmaxkPa *
Valve **connection
Main 00-2P/01-2P/02-2P/03-2P2.8 50 3.4" 2.5 50 3/4"
Valve set, 2 or 3 ways, on/off, withhot wax actuator.The set includes connection pipesand holders.
Notes
- The main battery valve connectionis ½" for CWS-01-02-03 sizes and¾" for CWS 04-05-06 sizes. Theauxiliary battery valve connectionis ½" on all unit sizes.
- The maximum pressure dropacross the fully open valve shouldnot exceed 25 kPa for coolingoperation and 15 kPa for heatingoperation.
Notes
49UNT-PRC011-E4
Notes
UNT-PRC011-E450
Notes
51UNT-PRC011-E4
Literature Order Number UNT-PRC011-E4
Date 0110
Supersedes UNT-PRC011-E4_1108
Trane has a policy of continuous product and product data improvement and reserves the right tochange design and specifications without notice. Only qualified technicians should perform theinstallation and servicing of equipment referred to in this publication.