Mestek HW-06-ECM Instruction manual

HWL2-0818
IN UNITED STATES: 260 NORTH ELM ST. WESTFIELD, MA 01085 800-465-8558 / FAX [phone]
IN CANADA: 7555 TRANMERE DRIVE, MISSISSAUGA, ONTARIO, L5S 1L4 [phone] / FAX [phone]
MODEL HW-ECM
INSTALLATION,
OPERATION &
MAINTENANCE
MANUAL
Low Temperature
High Wall Heating/Cooling Fan Coil
Units up to 2 Ton Capacity
A. General Description...........................................................2
B. Technical Data.................................................................3-5
 GeneralSpecication...........................................................3
 CoilData ..............................................................................4
SoundPowerandPressureData ........................................4
 DimensionalDrawings .........................................................5
C. Service and Installation................................................6-11
 InstallationofHigh-WallUnit................................................6
 SelectingaLocation ............................................................6
 MountingPlateDimensions .................................................7
InstallingtheMountingPlate................................................7
 DrillingtheCondensateDrainageHole ...............................8
 InstallingtheHydronicUnit ..................................................8
 DrainagePipingWorks ........................................................8
 UnitMaintenanceandPreparation ......................................9
 OpeningandClosingofLift-UpGrilleCover........................9
 RemovingFrontCoverAssembly ........................................9
 AirPurging ...........................................................................9
 WiringConnections..............................................................9
D. ControlSpecications:CompleteControlPCB-
S Type Control ............................................................10-14
 DenitionofInput/Output ...................................................10
 WiringDiagramFullControlPCB–SControlType .......... 11
 CongurationSettings .......................................................12
 ControlLogicsfor2-PipeSystem ......................................13
 WithThermoelectricValveConguration...........................13
 SleepMode........................................................................14
 AutoFanSpeed.................................................................14
 LEDLights .........................................................................14
 LEDDisplayandErrorDescription ....................................14
E. ControlSpecications:FlexibleControlPCB
W Type Control ...........................................................15-16
 DenitionofInput/Output ...................................................15
 WiringDiagramFlexibleControlPCB-
 WControlType ..................................................................16
F. Users Interface.................................................................17
 RemoteControlHandset ...................................................17
G. SensorResistanceR-TConversionTable................18-19
H. TroubleshootingGuide ...................................................20

2
Every product is manufactured to meet the
stringent requirements of the internationally
recognized ISO 9001 standard for quality
assurance in design, development and
production.
AllproductsconformtoULstandardforSafety
forHeatingandCoolingEquipmentUL19954th
Edition,October14,2011;
AllproductsconformtoCSAstandardforSafety
forHeatingandCoolingEquipmentCSAC22.2
No.236-11,4thEdition,October142011.
Allproductsconformtothe“WEEE”directiveto
guarantee correct standards of environmental
solutions.
ALWAYSMAKESURETHISMANUALREMAINSWITHTHEUNIT.READTHISMANUALBEFOREPERFORMINGANYOPERATION
ON THE UNIT.
INVESTING IN QUALITY, RELIABILITY & PERFORMANCE.
World Leading Design and Technology
Equipped with the latest air-conditioning test
rooms and manufacturing technology, we
produce over 50,000 fan coil units each year,
all conforming to the highest international
standardsofqualityandsafety.
The Highest Standards of Manufacturing
Inordertoguaranteetheveryhigheststandards
and performance, we manage every stage in
themanufacturingofourproducts.Throughout
the production process we maintain strict
control, starting with our extensive resources
in research and development through to the
design and manufacture of almost every
individualcomponent,frommoldedplasticsto
theassemblyofunitsandcontrollers.
Quality Controlled from Start to Finish
Ourhighly-trainedstaffandstrictqualitycontrol
methods enable us to produce products with
an exceptional reputation for reliability and
efciency, maintained over many years. As
well as full CE certication and ISO 9001,
severalproductsrangeshaveUL/ETLsafety
approval in the USA and Canada, Eurovent
performanceandsoundcerticationaswellas
ROHS compliance for Europe, giving you the
condenceofknowingourcompanyistheright
choicewhenselectingfancoilunits.
A. General Description
ThisHighWallUnitisdesignedtomeetandexceeddemandingrequirementsforefciency,quietoperationandappearance.The
sleek prole and elegantly styled cabinet complements any interior design theme, while the microprocessor assures accurate
environmentalcontrol.
Cabinet-thestylishcabinetisconstructedofdurableameresistantacrylonitrile-butadiene-styrene(ABS)plastic.Thesilverwhite
colorandroundedcornersprovideitsmodernlook.
WaterCoil-thewatercoilhasalargeheattransfersurfaceandutilizesthelatestnproletechnology.Itcombinesanadvanced
technologyapproachwiththesecurityofatraditionaldesignregardingtubethickness.Thewatercoilisalsoequippedwithanair
ventvalveandawaterpurgevalve.
Integral Hoses - an integral hose is a synthetic elastomer tube, with stainless steel outer braiding and brass connectors, which
enablesquick,lowcostconnectionswithnobrazing.
BlowerandMotor-theunitincorporatesonlyspeciallydesignedandtestedECmotors,allowingtheblowerwheeltoprovideoptimum
performanceinairow-efciencyandquietoperation.
Filters-washable,easy-to-remove,nemeshairltersarestandardtoallHighWallmodels.Tabslocatedonthefrontoftheunit
canbeunsnapped,allowingtheltertobeeasilysliddownwardandremoved.Notoolsarerequired,noranydismantlingofthe
equipment.
ISO 9001 QUALITY
ETL SAFETY STANDARDS
WEEE MARK

3
B. Technical Data
GeneralSpecication–HW-ECMSeries
Productrange:HW-ECMHydronicHighWall2PipewithECMotor
HW-[Size]-ECM 6 15 18
UnitConguration
Conguration 2-Pipe
NumberOfFanBlowers Single
PowerSupply (V/Ph/Hz) 115/1/60
Performance
Data
Air AirFlow
H
CFM
294 379 464
M 218 294 435
L 171 218 335
Cooling
CoolingCapacity
H
BTU/Hr
6967 10207 12602
M 5534 8394 11069
L 4620 6339 9040
SensibleCoolingCapacity
H 4889 7126 8808
M 3856 5822 7702
L 3202 4357 6247
Heating HeatingCapacity
H
BTU/Hr
11147 16331 20163
M 8854 13430 17710
L 7392 10142 14464
Electrical Fanmotorpower
H
W
18 26 30
M 13 20 20
L 10 13 13
FanMotorRunningCurrent@H115V A 0.284 0.364 0.544
Sound SoundPressureLevelH/M/L dB(A) 39/31/26 45/34/31 49/44/37
Hydronic
Weight
CoolingWaterFlowRate
H
GPM
1.39 2.03 2.52
M 1.1 1.68 2.2
L 0.92 1.26 1.81
CoolingPressureDrop
H
Ft.wg
7.53 8.92 6.12
M 5.09 6.37 4.91
L 3.75 3.95 3.48
HeatingWaterFlowRate GPM Sameas"CoolingWaterFlowRate"
@H/M/L
HeatingPressureDrop
H
Ft.wg
6.03 7.13 4.89
M 4.07 5.09 3.93
L 3 3.16 2.79
WaterContent gal 0.02 0.03 0.05
Water Type Socket(NPTThreadedFemale)
Connections In
in 1/2
Out
CondensateDrainageConnection 0.63
NetWeight lbs 26.5 28.7 30.9
a.CoolingMode(2-Pipe):  
Returnairtemperature:80°FDB/67°FWB. 
Inlet/Outletwatertemperature:45°F/55°F
b.HeatingMode(2-Pipe):  
Returnairtemperature:70°F 
Inletwatertemperature:140°F 
AirGrilleDistribution-allunitsareequippedwithbothdeectorbladesandindependentdirectionalvanes,enablingsupplyairtobe
automaticallydistributed,andairowanddirectiontobecustomized.
Microprocessorcontrols(S3type)
The PCB (printed circuit board) Modbus microprocessor controls functionality of the indoor-fan motor, water valves (ON/OFF or
modulating)andelectricheater(optional),tomaintainroomconditionsatauser-denedsetpoint.Temperaturesettings,fanspeeds
andothercontrolfunctionscanbechangedbyeitherinfraredhandsetorwiredwallpad.
Electro-mechanicalcontrols(W3type)
A 24VAC power strip is provided. Louver stepping motor controlled from PCB. Normally open or normally closed contacts are
standard,allowingconnectionandcontrolofelddevices.
• HighefciencyECmotor.
• Cool,Heat,Auto,DehumidierandFanmodes.
• Sleep,Auto-Fan,DailyTimer,Auto-Restartwithmemoryfunctions.
• Userfriendlyremotecontrol.
• Heatandcooltemperatureprotectionsandsafetycutout.
• Manualcontrolpanelincabinet.
• Auxiliaryswitchforcoolingandheatingsignal.

4
SoundPowerandPressureData
Sound Pressure
Model HW-06-ECM HW-15-ECM HW-18-ECM
A-weighted 33.8 24.6 20.7 40.9 27.9 24.3 44.4 39.4 32
Sound Pressure dB(A)
Sound
Pressure
in 1/3
Octave-
bands
(unit:dB)
31.5Hz 11.5 -8.4 -5.1 1.1 -4.6 -3.8 -5.7 -5.3 2.2
63Hz 10 -3.8 -5.9 3.8 -6.2 -5.4 13.1 5.3 1.9
125Hz 17 -0.8 -3.8 12.9 1.7 2.5 17.9 11.2 5.8
250Hz 30.3 13.2 8.6 29 15.3 16.1 33.1 26.9 20.3
500Hz 35.1 17.3 11.9 32.4 20.5 21.3 36.6 31.1 25.9
1000Hz 32.3 11.9 7.1 31 16.4 17.2 34.7 29.3 22.2
2000Hz 26.1 7.7 5.9 26.6 10.3 11.1 31.5 24.6 15.2
4000Hz 18.3 6.6 6.1 16.9 6.3 7.1 22.5 15.3 8.7
8000Hz 14.8 5.7 5.1 7.8 4.9 5.7 11.2 6.9 5.7
16000Hz 8 -1.4 -1.3 -1.3 -2.2 -1.4 -1.1 1.5 -1.4
Speed H M L H M L H M L
Model Fin Height
(inch)
Fin Length
(inch) Fins per Inch No. of Rows No. of Copper No. of Circuits TubeDiameter (inch)
HW-06-ECM 14.1 26.8
19.5
2 20 4 0.3
HW-15-ECM 14.1 26.8 2 26 5 0.3
HW-18-ECM 14.1 26.8 2 34 5 0.3
CoilData–2-PipeSystems

5
DimensionalDrawings–HW-06/15/18-ECM
(Alldimensionsareshownininches)
UnitDimensions
ABC D E F G H
1.57 4.13 34.45 2.17 4.13 R0.78 2.36 2.91
UnitDimensions
abcdef g h
7.87 2.17 1.18 1.18 8.66 9.02 0.39 11.81
UnitDimensions
1234
26.18 6.69 27.95 4.92
HW-06/15/18-ECM

6
C. Service and Installation
Operating Limits
PowerSupplies
WaterCircuit
InstallationofHighWallUnit
Selecting a Location
SelectthelocationfortheHighWallunitwiththefollowingconsiderations:
1. Theairinletandoutletareashouldbeclearwithoutobstructions.Theairshouldowfreely.
2. TheHighWallunitshouldbemountedonsolidwall.
3. Thelocationshouldalloweasyaccesstoconnectwaterpipeseasilyachievedrainage.
4. Ensuretheclearancearoundthefancoilunitconformstothefollowingdrawing.
5. Theunitshouldbeinstalledhigherthaneyelevel.
6. Avoidinstallingtheunitwithdirectsunlight.
Notes:
Requiredclearanceformaintenanceandservicingisasshownabove.
Alldimensionsshownininches.
7. Thesignalreceiverontheunitmustbekeptawayfromanyhighfrequencyemissionsource.
8. Keeptheunitawayfromuorescentlamps,whichmayaffectthecontrolsystem.
9. Avoidelectromagneticcontrolsysteminterference,ensurecontrolwiresareinstalledseparatelyfrom110VACpowersupplywires.
10.Useshieldedsensorcableswhereelectromagneticwavespresent.
11.Installanoiselterifthepowersupplycreatesanydisruptivenoises.
Volt Phase Hz
110-120 1 60
Minimumenteringwatertemperature 35.6°F(+2°C)
Maximumenteringwatertemperature 176°F(+80°C)
Watersiderecommendedmaximumpressure 232PSI(1600kPa)
Higher than eye level

7
Mounting Plate Dimensions
Installing the Mounting Plate
1. Selectthestructuralposition(e.g.apillarorlintel)onthewall.
2. Thentemporarilyfastenthemountingplateonthewallwithasteelnail.
3. Mountthemountingplatehorizontallyasshownintheabovegureorbymeansof
 gradiometer.Failuretofollowthismaycausewatertodripindoorsandcreateatypicalnoise.
4. Fixthemountingplatebymeansofexpansionscrewsortappingscrews. 
(Alldimensionsareininches)

8
Drilling the Condensate Drain Hole
1. Ensurethattheholeforcondensatedrainiscorrectlypositioned.Theheightshouldbelowerthanthebottomedgeoftheindoor
unit.
2. Drilla2.5"diameterholewithadescendingslope.
3. Sealitoffwithputtyafterinstallation.
Installing the Hydronic Unit
1. Passthepipingthroughtheholeinthewallandhooktheindoorunitonthemountingplatebytheupperhooks.
2. Movethebodyoftheunitfromsidetosidetoverifyifitissecurelyxed.
3. Whilepushingtheunittowardthewall,liftitslightlyfrombeneathtohookituponthemountingplatebythelowerhooks.
4. Makesuretheunitrmlyrestsonthehooksofthemountingplate.
Drain Piping Works
1. Installthedrainhosesothatitslopesdownwardslightlyforfreedrainage.Avoidinstallingitasshowninthebelowillustrations
markedwithan“X”.
2. Putwaterinthedrainpanandmakesurethatthewaterdrainsoutdoors.
3. Iftheexibledrainhoseprovidedwiththeindoorunitisnotlongenough,pleaseextenditbyjoiningittoaeldsuppliedextension.
Besuretoinsulatetheconnectingpartoftheextensionwithashieldpipeasshown.
4. Iftheattacheddrainhosepassesthroughanindoorarea,insulateitwithinsulationmaterial.

9
UnitMaintenanceandPreparation
Opening and Closing Of Lift-Up Grille Cover
RemovingFrontCoverAssembly
1. Setthehorizontallouvertothehorizontalposition.
2. Removethescrewcapsbelowthelouver,andthenremovethemountingscrews.
3. Openthelift-upgrillecoverbygraspingthepanelatbothsidesasshownabove.
4. Removetheremainingscrewslocatedinthecenterofthefrontcover.
5. Graspthelowerpartofthefrontcoverandpulltheentireassemblyoutanduptowardsyou.
Air Purging
1. After connecting the water inlet and outlet pipes to the main supply lines turn on the main breaker and operate the unit in
COOLINGmode.
2. Openthewaterinletvalveandoodthecoil.
3. Checkallconnectionsforwaterleakage.Ifnoleakisfound,openthepurgingvalvewithanopenendwrenchwhilesupporting
theunitwithyourotherhand.Thenpurgetheairtrappedinsidethecoil.Whenperformingthisactivity,takecarenottotouchthe
electricalparts.
4. Closethepurgingvalvewhennobubblesappear.
5. Openthewateroutletvalve.
Wiring Connections
Unitcomponentsarewiredtotheterminalblockoftheindoorunit.Wiringcanbeaccessedfromtheterminalblockinsidethecontrolbox.
Openthegrillecoverbyliftingfromthebottompositionindicated
bythearrows.
Closethegrillecoverbypressingdownatthepositionsindicated
bythearrows..

10
D.ControlSpecications:CompleteControlPCB-STypeControl
Abbreviations
  Ts=Settingtemperature   AUX1=Hotwaterfreecontact
  Tr=Roomairtemperature  AUX2=Chilledwaterfreecontact
  Ti1=Chilledwatercoiltemperature MTV1=ChilledMotorizedvalve
  Ti2=Hotwatercoiltemperature  MTV2=HotMotorizedvalve
DenitionofInput/Output
I/O Code 2-Pipe
AnalogueInput Returnairsensor AI1 Returnairtemperature(Tr)
Coilsensor AI2 Chilled/hotwatercoilcircuit(Ti1)
Input LEDdisplay/IRreciever X-DIS1 DigitalcommunicationporttoLEDdisplay/IRreceiverboard.
Digitalinput Occupancycontact On/Off Windowcontacts:forremoteON/OFF(whenDIPBSW1=1).Economy
contacts:forremoteactivationofeconomymode(whenDIPBSW1=0).
Powerinput
Phase L1
Powersupply:115V/1Ph/60HzNeutral N1
Earth PE1
Voltageoutput
Fan CN4 Fandriver
Valve1 MTV1 2-pipecoilcircuitvalveoutput-chilled/hotwatervalve.
Voltageoutput(L)
Valve2 MTV2 Reserved
Output
Steppingmotor CN1 / CN2 Louversteppingmotorrelay
Auxiliarycontact2 AUX2 Coolingmodesignalrelay(NO).Voltagefreecontact.Toensurethe
sensitivityoftheconnection,pleasemakesuremaxwiringlength<100ft.
Auxiliarycontact1 AUX1 Heatingmodesignalswitch(NO).Voltagefreecontact.Toensurethe
sensitivityoftheconnection,pleasemakesuremaxwiringlength<200"100ft.

11
WiringDiagramFullControlPCB-SControlType
Wiring Schematic

12
MotorizedFanSpeedSettingsforDifferentModelsonDIPB:
Modeconguration:
HighWallUnitON/OFF
 Thereare3waystoturnthesystemonoroff:
 a) BytheON/OFFbuttononthehandsetorwiredwallpad.
 b) Bytheprogrammabletimeronthehandsetorwiredwallpad.
 c) BythemanualcontrolbuttonontheHighWallunit.
PowerOnSetting
 Thereare3waystoturnthesystemonoroff:
 a) Handsetonlyuserinterface:WhenthepowerONsignalisreceivedbytheunit,theMode,FanSpeed,Settemperature
 andLouversettingwillbethesameasthehandsetsettingbeforethelastpowerOFF.
 b) WhenthepowerONsignalisreceivedbytheHighWallunit,theMode,FanSpeed,Settemperature,Louversettingand
 TimerON/OFFweeklyprogramwillbethesameasthehandsetsettingbeforethelastpowerOFF.
Unit Model Speed (RPM)
Low Medium High
HW-06-ECM 600 700 900
HW-15-ECM 700 800 1100
HW-18-ECM 900 1100 1300
DefaultRPM 900 1200 1350
DIPA-S1 Model
SW7 SW8 Model setting
0 0 Cool-Heat
0 1 Cool-Heat+boosterheater
1 0 Coolingonly
1 1 Cool+primaryheater

13
ControlLogicsFor2-PipeSystem(StandardUnit)
WithThermoelectricValveConguration
COOL MODE
a) MTV2,AUX1andheaterarealwaysoff.
b) IfTr≥Ts+1.8ºF(or+7.2ºFifeconomycontactisactivated),thencooloperationisactivatedandMTV1andAUX2areturnedon.
Indoorfanrunsatsetspeed.
c) IfTr<Ts,thencooloperationisterminatedandMTV1andAUX2areturnedoff.Indoorfanrunsatsetspeed.
d) TherangeofTsis60.8-86ºF
e) Indoorfanspeedcanbeadjustedtolow,medium,highandauto.
f) Whenturnedon,MTV1requires30secondsbeforeitisfullyopen.
g) Whenturnedoff,MTV1requires120secondsbeforeitisfullyclosed.
h) Whentheunitisturnedoff,theindoorfanwillshutdownafter5seconds.
LOW TEMPERATURE PROTECTION OF INDOOR COIL
a) IfTi1≤35.6ºFfor2minutes,thenMTV1andAUX2areturnedoff.Ifindoorfanissetforlowspeed,itwillrunatmediumspeed.If
itissetatmediumorhighspeed,itwillkeeprunningatthesamespeed.
b) IfTi1≥41ºFfor2minutes,thenMTV1andAUX2areturnedon.Indoorfanrunsatsetspeed.
FAN MODE
a) Indoorfanrunsatthesetspeedwhileheater,MTV1,MTV2,AUX1andAUX2areturnedoff.
b) Indoorfanspeedcanbeadjustedtolow,mediumandhigh.
PRE-HEAT
a) IfTi1<96.8ºF(or82.4ºFdependingonDIPsetting),thenMTV1andAUX1areturnedon,indoorfanrunsat200RPM.
b) IfTi1≥100.4ºF(or86ºFdependingonDIPsetting),thenMTV1andAUX1areturnedon,indoorfanrunsatsetspeed.
c) Iftheindoorcoiltemperaturesensorisdamaged,thenthepre-heattimeissetfor2minutes.Indoorfanrunsatsetspeed.
POST-HEAT
a) IfTi1≥100.4ºF,thenMTV1andAUX1areturnedoff.Indoorfancontinuestorunatsetspeed.
b) If96.8ºF≤Ti1≤100.4ºF,thenMTV1andAUX1areturnedoff.Indoorfanmaintainsitsoriginalstate.
c) IfTi1<96.8ºF,thenMTV1andAUX1areturnedoff.Indoorfanrunsat200RPM.
d) Iftheindoorcoiltemperaturecoilisdamaged,thenthepost-heattimeissetfor3minuteswiththeindoorfanrunningatsetspeed.
OVER-HEAT PROTECTION OF INDOOR COIL
a) IfTi1≥167ºF,thenMTV1andAUX1areturnedoff.Indoorfanremainsonandrunsathighspeed.
b) IfTi1<158ºF,thenMTV1andAUX1areturnedon.Indoorfanremainsonandrunsatsetspeed.
c) Iftheindoorcoiltemperaturesensorisdamaged,thentheprotectionmodewillbeoverriddenandtheunitwillworkaccordingto
thepre-heatandpost-heatprogram.
DEHUMIDIFICATION MODE
a) MTV2,AUX1andheaterarealwaysoff.
b) IfTr≥77ºF,thenMTV1andAUX2willbeturnedonfor3minutes,andthenofffor4minutes.
c) If60.8ºF≤Tr<77ºF,thenMTV1andAUX2willbeturnedonfor3minutes,andthenofffor6minutes.
d) IfTr<60.8ºF,MTV1andAUX2willbeturnedofffor4minutes.
e) Attheendoftheabovedehumidicationcycle,thesystemwilldecidethenextdehumidicationcontroloption.Indoorfanwillrun
atlowspeedthroughoutthedehumidicationprocess.
AUTOMODE
a) Everytimetheunitisturnedon,MTV1isonwhileAUX1,AUX2andfanareoff.MTV2andtheheaterarealwaysoff.After120
seconds,thesubsequentoperationmodeisdecidedaccordingtothefollowing:
i. Ifthecoiltemperaturesensor(Ti1)≥96.8°F,thenMTV1,AUX1andfanturnonoroffaccordingtoHEATmode.
ii. IfTi1<96.8°F,thenMTV1,AUX2andfanturnonoroffaccordingtoCOOLmode.
b) UnitremainsinAUTOCOOLorAUTOHEATmodethroughouttheoperatingcycleuntiltheuserchangesthemodemanuallyor
restartstheunit.
c) ShouldtheTi1sensorfailorbedamaged,automodewillnotfunction.
Note:AUTOCOOLorAUTOHEAToperationsarethesameasCOOLorHEATmoderespectively.

14
SleepMode
a) Thesleepmodecanonlybesetwhentheunitisincoolmodeorheatmode.
b) Ifthesleepmodeisactivatedwhentheunitisincoolmode,thentheindoorfanwillrunatlowspeedandTswillincreaseby3.6ºF
over2hours.
c) Ifthesleepmodeisactivatedwhentheunitisinheatmode,thentheindoorfanwillrunatsetspeedandTswilldecreaseby3.6ºF
over2hours.
d) Changingthemodeofoperationwillcancelthesleepmode.
  Thecoolmodesleepproleis:     Theheatmodesleepproleis:
AutoFanSpeed
InCOOLmode,thefanspeedcannotchangeuntilithasrun
formorethan30seconds.Fanspeedisregulatedaccordingto
theprolebelow.
LEDLights
LEDDisplayandErrorDescription
InHEATmode,thefanspeedcannotchangeuntilithasrunfor
morethan30seconds.
For all units
Power/OperationLEDlight(bothgreen)
Uniton PowerLEDOff,OperationLEDOn
Unitinstandby PowerLEDOn,OperationLEDOff
For all units - Operation LED light (Green)
Error Description Blink Reason Remedy
Electricalheaterfailure GreenLEDblinks1times,
stopsfor3s
OnlyforunitwithEH.
EHsafetyswitchisopen.
1.Changefanspeedtohigh.
2.ReplacethedamagedEHsafetyswitch.
Indoorcoilsensor2
failure
GreenLEDblinks2times,
stopsfor3s
Ti2sensorunpluggedor
damaged.
1.CheckifTi2plugisconnectedornot.
2.Checkifsensor’sresistanceiscorrectornot.
Returnairsensor
failure
GreenLEDblinks3times,
stopsfor3s
Roomsensorunpluggedor
damaged.
1.CheckifTrplugisconnectedornot.
2.Checkifsensor’sresistanceiscorrectornot.
Indoorcoilsensor1
failure
GreenLEDblinks4times,
stopsfor3s
Ti1sensorunpluggedor
damaged.
1.CheckifTi1plugisconnectedornot.
2.Checkifsensor’sresistanceiscorrectornot.
Indoorcoillow
temperatureprotection
GreenLEDblinks5times,
stopsfor3s
Watertemperatureislower
than37.4ºF. Checkthewatertemperature.
Indoorcoiloverheat
protection
GreenLEDblinks6times,
stopsfor3s
Watertemperatureishigher
than158ºF. Checkthewatertemperature
ECmotorfailure GreenLEDblinks9times,
stopsfor3s NoECmotorfeedback 1.CheckDIPB-SW5andSW6setting.
2.ChecktheECmotor.

15
E.ControlSpecications:FlexibleControlPCB-WTypeControl
Abbreviation
  Ti1=Chilledwatercoiltemperature
DenitionofInput/Output
I/O Code 2-Pipe
AnalogueInput ChilledwaterSensor AI1 Coilsensor(Ti1)
Powerinput
HighSpeed Lo 24Voltageinput(NO).Ifanyspeedispowered,theunitisturnedon.
Ifnospeedreceivespower,theunitisturnedoff.
MediumSpeed Med
LowSpeed Hi
Powerinput
Phase L
Powersupply:115V/1Ph/60HzNeutral N
Earth GND
Output
ECmotor CN3 ECmotoroutput
Steppingmotor CN1, CN2 Steppingmotoroutput
ElectricHeaterSignal CN4, CN5 ElectricHeatercontrolsignal
LEDDisplay X-DIS LEDDisplaysignal

16
WiringDiagramFlexibleControlPCB-WControlType
Wiring Schematic

17
F. Users Interface
RemoteControlHandset
Attention
When unit with handset is the master unit, its
settings are automatically sent to the slave units;
Auto Cool -Heat operation will be applicable in 4-
pipe system only.
“Swing” function is not applicable.
European version only uses degree C setting.
Swing
It is not available.

18
G.SensorResistanceR-TConversionTable
Resistance: R(77°F)=10KΩ±1%
BetaConstant: B(25/85)=3977±1%
T Rmin Rnom Rmax T Rmin Rnom Rmax
(°F) (KΩ) (KΩ) (KΩ) (°F) (KΩ) (KΩ) (KΩ)
-22 174 182.7 191.8 39.2 26.11 26.9 27.71
-20.2 163.4 171.5 179.9 41 24.85 25.59 26.34
-18.4 153.6 161.1 168.9 42.8 23.65 24.35 25.05
-16.6 144.4 151.3 158.5 44.6 22.52 23.17 23.83
-14.8 135.8 142.2 148.9 46.4 21.45 22.06 22.68
-13 127.8 133.8 140 48.2 20.44 21.01 21.59
-11.2 120.3 125.8 131.6 50 19.48 20.02 20.55
-9.4 113.3 118.4 123.8 51.8 18.58 19.7 19.58
-7.6 106.7 111.5 116.5 53.6 17.71 18.18 18.65
-5.8 100.6 105.1 109.7 55.4 16.9 17.33 17.77
-4 94.9 99.03 103.3 57.2 16.12 16.53 16.94
-2.2 89.51 93.39 97.41 59 15.39 15.77 16.16
-0.4 84.5 88.11 91.85 60.8 14.69 15.05 15.41
1.4 79.8 83.17 86.64 62.6 14.03 14.37 14.7
3.2 75.39 78.53 81.76 64.4 13.41 13.72 14.03
5 71.26 74.18 77.19 66.2 12.81 13.1 13.4
6.8 67.37 70.1 72.9 68 12.24 12.52 12.79
8.6 63.73 66.26 68.88 69.8 11.7 11.96 12.22
10.4 60.3 62.67 65.1 71.6 11.19 11.43 11.67
12.2 57.08 59.28 61.55 73.4 10.71 10.93 11.15
14 54.05 56.1 58.22 75.2 10.24 10.45 10.66
15.8 51.19 53.12 55.08 77 9.8 10 10.2
17.6 48.51 50.3 52.14 78.8 9.374 9.57 9.765
19.4 45.98 47.66 49.37 80.6 8.969 9.16 9.351
21.2 43.61 45.17 46.77 82.4 8.584 8.77 8.957
23 41.36 42.82 44.31 84.2 8.218 8.4 8.582
24.8 39.25 40.61 42 86 7.869 8.047 8.225
26.6 37.26 38.53 39.83 87.8 7.537 7.71 7.885
28.4 35.38 36.56 37.78 89.6 7.221 7.39 7.56
30.2 33.6 34.71 35.85 91.4 6.92 7.085 7.251
32 31.93 32.97 3402 93.2 6.633 6.794 6.956
33.8 30.35 31.32 32.3 95 6.36 6.517 6.675
35.6 28.85 29.76 30.68 96.8 6.099 6.252 6.407
37.4 27.44 28.29 29.15 98.6 5.85 6 6.151

19
Resistance: R(77°F)=10KΩ±1%
BetaConstant: B(25/85)=3977±1%
T Rmin Rnom Rmax T Rmin Rnom Rmax
(°F) (KΩ) (KΩ) (KΩ) (°F) (KΩ) (KΩ) (KΩ)
100.4 5.614 5.759 5.907 167 1.417 1.474 1.532
102.2 5.387 5.53 5.673 168.8 1.37 1.426 1.482
104 5.172 5.31 5.451 170.6 1.326 1.379 1.434
105.8 4.966 5.101 5.238 172.4 1.282 1.335 1.389
107.6 4.769 4.901 5.034 174.2 1.241 1.292 1.344
109.4 4.582 4.71 4.84 176 1.201 1.25 1.302
111.2 4.402 4.527 4.654 177.8 1.162 1.211 1.261
113 4.231 4.353 4.477 179.6 1.125 1.172 1.221
114.8 4.067 4.186 4.307 181.4 1.089 1.135 1.183
116.6 3.911 4.027 4.144 183.2 1.055 1.1 1.146
118.4 3.761 3.874 3.989 185 1.021 1.065 1.111
120.2 3.618 3.728 3.84 186.8 0.9891 1.032 1.077
122 3.481 3.588 3.697 188.6 0.9582 1 1.044
123.8 3.35 3.454 3.561 190.4 0.9284 0.9697 1.012
125.6 3.225 3.326 3.43 192.2 0.8998 0.9401 0.9818
127.4 3.105 3.204 3.305 194 0.8721 0.9115 0.9522
129.2 2.99 3.086 3.185 195.8 0.8455 0.8839 0.9237
131 2.88 2.974 3.07 197.6 0.8198 0.8573 0.8961
132.8 2.774 2.866 2.959 199.4 0.795 0.8316 0.8696
134.6 2.673 2.762 2.854 201.2 0.7711 0.8069 0.8439
136.4 2.576 2.663 2.752 203 0.748 0.783 0.8192
138.2 2.483 2.568 2.655 204.8 0.7258 0.7599 0.7953
140 2.394 2.477 2.562 206.6 0.7043 0.7376 0.7722
141.8 2.309 2.39 2.472 208.4 0.6836 0.7161 0.7499
143.6 2.227 2.306 2.386 210.2 0.6635 0.6953 0.7283
145.4 2.149 2.225 2.304 212 0.6442 0.6752 0.7075
147.2 2.073 2.148 2.224 213.8 0.6255 0.6558 0.6874
149 2.001 2.074 2.148 215.6 0.6075 0.6371 0.6679
150.8 1.931 2.002 2.075 217.4 0.59 0.619 0.6491
152.6 1.865 1.934 2.005 219.2 0.5732 0.6015 0.631
154.4 1.801 1.868 1.937 221 0.5569 0.5846 0.6134
156.2 1.739 1.805 1.872
158 1.68 1.744 1.81
159.8 1.623 1.686 1.75
161.6 1.569 1.63 1.692
163.4 1.516 1.576 1.637
165.2 1.466 1.524 1.583

20
H.TroubleshootingGuide
IN UNITED STATES: 260 NORTH ELM ST. WESTFIELD, MA 01085 800-465-8558 / FAX [phone]
IN CANADA: 7555 TRANMERE DRIVE, MISSISSAUGA, ONTARIO, L5S 1L4 [phone] / FAX [phone]