Comfort Stat CP1819 - Installation and Wiring; Selector Switches Configuration; Wiring Diagrams; Installation Steps

SelectorSwitches
Inorderforthisthermostattocontrolyoursystem,thesystemtypemustbespecified
by the selectorswitches onthe printedcircuit boardinside the thermostat. Thereis
alsoaselectorswitchforyourchoiceofFahrenheitorCelsiustemperaturedisplay.
ŸF˚/C˚selector(Fahrenheit/Celsius)
Your thermostatis setfor F˚mode fromthe factory.Inorder tochangeto C˚mode,
slidetheswitchtoC˚andMovethebatteryoutandwaitforabout1minutethenplace
thebatteries..
NOTE: Unless press any key about 2 seconds without the battery, then place the
battery again. the thermostat will not change temperature mode. All programs and
settingswillbelost.
ŸHeatingSystemSelector(HG–HEswitch)
Thefactorypositionforthisswitchisinthe“HG”position.Leaveinthispositionifyou
haveagasfurnaceoranoilburner.Ifyouhaveanelectricfurnace,testtoseewhether
theHeatandFancomeonasexpectedafterinstallation.IftheFanoperationisnormal,
leave it in the “HG” position. If the Fan does not come on within a minute of the
thermostatcallingforheating,changetheswitchpositionto“HE”.Thesystemselector
hasnoeffectinthecoolingmode.
NOTE: “HG”position isfor gasand most other systems.“HE”positionisfor certain
electricsystemshavingafanrelay.
ŸSystemSelector(STANDARD–HEATPUMPswitch)
ThefactorypositionforthisswitchisintheSTDposition.Leaveitinthispositionifyou
have ANY system that uses gas, oil, electric, or hot water heating. If you have a
singlestageHeatPump(noauxiliaryoremergencyheatsource),thenslidetheswitch
totheHPposition.Besurethereversingvalvewireisconnectedtothecorrectterminal
foryourheatpump(Y/O)or(W/B).
ŸAutoRecoveryselector(DISABLE/ENABLE)
YourthermostatissetfromthefactorywiththeAutoRecoveryFeatureenabled,which
complieswiththeEPAENERGYSTARProgram.IFyouprefertousenormalrecovery,
slidetheswitchtotheDISABLEposition.
INSTALLATION
WhatYouNeed
Thisthermostatincludestwo#8slottedscrewsandtwowallanchorsformounting.To
installyourthermostat,youshouldhavethefollowingtoolsandmaterials.
ŸSlottedScrewdriver(s)
ŸSmallPhilipsscrewdriver
ŸHammer..
ŸElectricdrilland3/16”bit
ŸTwo1.5V(AA)sizealkalinebatteries(included)
RemoveOldThermostat
CAUTION:Donotremoveanywiringfromexistingthermostatbeforereadingthe
instructionscarefully.Wiresmustbelabeledpriortoremoval.
INPORTANT!Turnoffthepowertothefurnaceatthemainpowerpaneloratthe
furnace.
Removeexisting thermostatcover andthermostat.See Figure 1. Somethermostats
willhave screws or otherlocking devicesthatmust first beremoved. Oncethe wall
mounting plate is exposed, look for wires. If wires are not visible, they may be
connectedtothebackofthewallplate.Again,lookforscrews,tabs,etc.Somemodels
havedoorsthatopentoexposewiresandmountingscrews.SeeFigure1.
TypicalHomeThermostats
Figure1
WiringLabeling
ŸEach wirecomingfrom the wall tothe existing thermostat is connectedtoterminal
pointonthatthermostat.Eachof theseterminal points is usuallymarkedwithacode
letterasshowninTableAbelow.
ŸNotethatthisthermostathasmultiplefunctionterminalsthatallowSingleStageHeat
Pumpcapability. Standard systems use:Rh, Rc,G, Y,W.[SingleStageHeat Pumps
use:R,Y,G,andOorB.]TableAbelowshowsthemultiplefunctionsoftheterminals.
Usetheterminalsthatmatchyoursystem.
ŸThenumberofwiresinyoursystemcanbeasfewastwo(forheatonlysystems),as
many as eight, or any number in between. If you follow the labeling procedures
correctly,youdonothavetobeconcernedabouthowmanywiresthereare.
ŸThereisoftennoterminalmarkingontheexisting
thermostat of two wire, heat only systems. Just
connecteitherofthewirestotheRHterminal,then
connect the other wire to the W terminal to
completethecircuit.
ŸIMPORTANT!BEFOREDISCONNECTINGANY
WIRES, APPLY THE SELFADHESIVE LABELS
PROVIDEDTOTHEWIREASSHOWNINTABLE
ABELOW.(Forexample,attachthelabelmarked
Wtothe wirethattoestotheWorHterminalonyourexistingthermostat.)IGNORE
THECOLOROFTHEWIRESsincethesedonotalwayscomplywiththestandard.
ŸAfterlabelingwires,disconnectthemfromtheexistingthermostat.
ŸRemoveexistingwallplate.Tomakesurewiresdonotfallbackintowallopening,you
maywanttotapethemtothewall.
ŸIfholeinwallislargerthannecessaryforwires,sealthisholewithinsulatingmaterial
sothatnohotorcold aircan entertheback of thethermostatfromthe wall.This air
couldcauseafalsethermostatreading.
TableA
Ifthecodeletteronyour
existing
Thermostatis
thenmarkthewirewith
labelshown
andconnectto
thermostatterminal
shown
NOTE: Donotconnecta “Common”wire(sometimes labeled“C”)to anyterminal on
this thermostat. Tape up the wire and do not use. This wire provides electricity to
nonbatterypoweredthermostats.
MountWallplateandThermostat
Ÿ Remove the wall plate from your thermostat by pressing the release tab on the
bottomofthethermostat.SeeFigure2.
Figure2.
ŸPositionwallplate onwallandpull existingwires throughlargeopening. Thenlevel
forappearance.Markholesfor plasticanchorsprovided,ifyourexistingholesdonot
lineupwiththoseonthewallplate.
ŸDrillholeswith3/16”bitandgentlytapanchorsintothebolesuntilflushwithwall.
Ÿ Reposition wallplate to wall, pulling wires through large opening. Insert mounting
screwsprovidedintowallanchorandtighten.SeeFigure3.
Figure3.
NOTE:5WireSystems
IfyourthermostathasonewiremarkedRorRh(2,3,or4wiresystem),thenleavethe
jumperwirebetweentheRhandRcterminalsonthewallplate.Otherwise,ifyouhave
separateRhandRcwires(5wiresystem),thenremovethejumperwirebetweenthe
RhandRcterminals.
ConnectWiresandMountThermostattoWallplate
ŸMatchandconnectthelabeledwirestotheappropriatecodedterminalscrewsonthe
wallplate.(See Figure4,5.)Ignoreany wireswhichmay bepresent,butwhichwere
noteconnectedtotheoldthermostat.
ŸRefertotheWiringDiagramsbelowtobesureyoursystemiswiredcorrectly.
ŸIfyoursystemisasinglestageheatpumpandusesanOorBwire,youmustmove
the System Selectorswitch inside thethermostat to theHeat Pump position. Ifyou
havea normal furnace orelectric system,leave theswitchin theStandard position.
RefertotheSystemSelectorsectiononthebackformoreinformationonthisswitch.
ŸBesuretotightentheterminalscrewssecurely,otherwisealoosewirecouldcause
operationalproblemswithyoursystemorthermostat.
Ÿ Push excess wires back into the hole to prevent interference when installing the
thermostattothewallplate.
ŸMakesuretheSystemSwitchissettoOFF,andtheFanSwitchissettoAUTO.
Ÿ Insert the bottom tabs on thethermostat body into theslots atthe bottom of the
wallplate.Press thetop ofthe thermostatbodyto snapit intothe wallplate.Referto
Figure6.
NOTE: Do not forcethe thermostat ontothe wallplate, as thet erminal pins maybe
damaged.Ifitdoesnotsnapproperly,thethermostatmaynotwork.
Ÿ Insert thetwoAA sizealkaline batteries, observing the polarity marked insidethe
batterycompartment.
ŸSwitchonthemainpoweratthepanelorfurnace.
Figure4                       Figure5
Figure6
WiringDiagrams
TROUBLESHOOTING
Problem Solution
1. Check battery connections and
batteries.
NoDisplay
2. Move the battery out andwait for
about1minute
EntireDisplayDims. 1.ReplaceBatteries.
Auto Fan Does Not Turn On
Properly.
1. Move HG/HE selector to correct
position.
1.Checkthatthefunctionswitchisin
the correct position (“HEAT” or
“COOL”).
2.Theremaybeasmuchas4mintue
delaybeforethesystemturnsOn–
wait and check. (Compressor
protectiondelay.)
3. Check your circuit breakers and
switchestoensurethere is power
tothesystem.
4.Replacebatteries.
5. Make sure your furnace blower
doorisclosedproperly.
6.Ifyournonheatpumpsystemonly
uses 4wires, be sure the jumper
wire is installed between the Rh/B
andRc/Oterminals.
7. Check the position  of the
Reversing Valve selector switch:
StandardorHeatPump.
Heating or Cooling Does Not Go
OnorOff.
8. If you have singlestage heat
pump, be sure the jumper wire is
installed between the Y and W
terminals.
ErraticDisplay 1.Movethe batteryout holdanykey
thenplacethe batteryagain. Then
reprogram.
If unit continues to operate in the
Offposition.
1.Replaceunit.
Thermostat permanently reads
“HI”,“LO”,or“E1”,“E2”..
1.Replaceunit.
Ifyouexperienceanyotherproblems,callusfortechnicalassistance.
Theservicenumberis18665919898
W
G
Y
RH
RC
WallmountingPlate   Thermostat          Cover
WallmountingPlate   Thermostat          Cover
1 2 3 4
RECO VER YEN ABLE
DISA BLE
STD HP
HG HE
K6
JP1
K5
CENTI GRAD E FAH REN HEIT
Y1
Y1
RH
RC
G
Y/ O
W/B 
Y1
AC2 4V
AC2 4V
N
L
N
L
Y/O
Rh
Rc
G
L
N
Y1
W/B
RH
G
Rc Rh
Y/O
W/B Y1
Wallplate
Terminals
Jumper
Fan
Relay
Cool
Contactor
HeatRelay
orValve
System
Selector
STD
HP
Fan
Relay
Compressor
Contactor
Reversing
Valve
Wallplate
Terminals
System
Selector
HP
STD
Wallplate
Terminals
No
Jumper
System
Selector
HP
STD
Jumper
Heat
Mode
Cool
Mode
OR
Heat24Vor
MillivoltSupply
HeatRelay
orValve
Wallplate
Terminals
Jumper
System
Selector
HP
STD
Wallplate
Terminals
System
Selector
HeatRelay
orValve
Jumper
HP
STD
Fan
Relay
Fan
Relay
Wallplate
Terminals
Cool
Contactor
System
Selector
HP
STD
Jumper
4WireHeat/CoolSystem
5WireHeat/CoolSystem
SingleStageHeatPumpSystem
2WireHeatOnlySystem
3WireHeatOnlySystem
3WireCoolOnlySystem
G
Rc
Rh
Y/O
W/B Y1
Fan
Relay
Heat
24V
Supply
Cool
Contactor
Heat
Relay
orValve
G
Rc Rh
Y/O
W/B
Y1
G Rc Rh
Y/O
W/B Y1
G Rc Rh
Y/O
W/B Y1
G Rc
Rh
Y/O
W/B Y1
120V
AC
120V
AC
120V
AC
120V
AC
120V
AC
120V
AC
N
L
AC24V
NL
AC
24V
NL
AC24V
N
L
AC24V
NL
AC24V
NL
AC24V