Daikin 910121748 User Manual

Specifications
Electrical rating: • 24VAC(18-30VAC)
 • 1ampmaximumperterminal
 • 3ampmaximumtotalload
Temperature control range: 55°Fto90°F(13°Cto32°C)Accuracy:±1°F(±0.5°C)
System congurations:2-stageheat,2-stagecool
Timing:Anti-shortCycle:4minutes(bypassanti-shortcycledelaybyreturningtoOFFmodefor5seconds)
 BacklightOperation:10seconds
Terminations:A,L,S1,S2,R,C,W1,Y1,W2,Y2,G,O
Package Contents/Tools Required
Package includes:910121748thermostatonbase,thermostatcover,wiringlabels,screwsandwallanchors,
Installation,OperationandApplicationGuide
Tools required for installation:Drillwith3/16”bit,hammer,screwdriver
Important Safety Information
WARNING! : Always turn off power at the main power supply before installing, cleaning, or removing
thermostat.
• Thisthermostatisfor24VACapplicationsonly;donotuseonvoltagesover30VAC
• Allwiringmustconformtolocalandnationalelectricalandbuildingcodes
• Donotuseairconditioningwhentheoutdoortemperatureisbelow50degrees;thiscandamageyourA/Csystem
andcausepersonalinjuries
• Usethisthermostatonlyasdescribedinthismanual
To Remove Existing Thermostat
ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse
or switching the appropriate circuit breaker to the OFF position before removing the existing
thermostat.
1. Turnoffpowertotheheatingandcoolingsystembyremovingthefuseorswitchingtheappropriatecircuit
breakeroff.
2. Removecoverofoldthermostat.Thisshouldexposethewires.
3. Labeltheexistingwireswiththeenclosedwirelabelsbeforeremovingwires.
4. Afterlabelingwires,removewiresfromwireterminals.
5. Removeexistingthermostatbasefromwall.
6. Refertothefollowingsectionforinstructionsonhowtoinstallthisthermostat.
To Install Thermostat
ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse
or switching the appropriate circuit breaker to the OFF position before removing the existing
thermostat.
IMPORTANT: Thermostat installation must conform to local and national building and electrical codes and
ordinances.
Note:Mount the thermostat about ve feet above the oor. Do not mount the thermostat on an outside wall, in
direct sunlight, behind a door, or in an area affected by a vent or duct.
1.Turnoffpowertotheheatingandcoolingsystembyremovingthefuseorswitchingtheappropriatecircuitbreaker
off.
2.Toremovecover,pullgentlyattheseamatthetop.
3.Putthermostatbaseagainstthewallwhereyouplantomountit(Besurewireswillfeedthroughthewireopening
inthebaseofthethermostat).
4.Marktheplacementofthemountingholes.
5.Setthermostatbaseandcoverawayfromworkingarea.
6.Usinga3/16”drillbit,drillholesintheplacesyouhavemarkedformounting.
7.Useahammertotapsuppliedanchorsinmountingholes.
8.Alignthermostatbasewithmountingholesandfeedthecontrolwiresthroughslitinthermalintrusionbarrierand
intowireopening.
9.Usesuppliedscrewstomountthermostatbasetowall.
10.Insertstripped,labeledwiresinmatchingwireterminals.

CAUTION! :Be sure exposed portion of wires does not touch other wires.
11.Gentlytugwiretobesureofproperconnection.Doublecheckthateachwireisconnectedtotheproper
terminal.
12.Turnonpowertothesystematthemainservicepanel.
13.Congurethermostattomatchthetypeofsystemyouhave.
14.Replacecoveronthermostatbysnappingitinplace.
15.Testthermostatoperationasdescribedin“TestingtheThermostat”.
Parts Diagram
Icon Descriptions
Coolingoperationicon
Fanoperationicon
Heatingoperationicon
Roomtemperature
offsetactivated
1
ST
Cool 2
ND
Cool 1
ST
Heat 2
ND
Heat
Heat/Cool Y1 YI,Y2 W1 W1,W2
The910121748thermostatiscongurableforallsystems.Thecongurationdirectlyaffectstheoutputs.
Usetheoutputcharttocorrectlycongureandwirethethermostattoyoursystem.
910121748 Output Chart
Configuration Mode
OFF
PM
1. Verifythe910121748isintheOFFmode.
 PresstheSYS(left)buttonuntiloffmodedisplays.
2. Removethecoverofthethermostatbygentlypullingnearoneofthecornersat
thetopofthethermostat.
3. PresstheCONFIGbuttonfor1secondwhilethe910121748isinOFF mode.
Toexitcongurationmode,presstheCONFIGswitchfor1second.
Presstheupordownbuttontochangesettingswithineachscreen.
Downbutton
Upbutton
Presstherightbuttontoadvancetothenextscreen.
Note:Pressing the left button will return you to the previous screen.
Left
button
Right
button
Thecongurationmodeisusedtosetthe910121748tomatchyourheating/coolingsystem.Tocongurethe
910121748,performthefollowingsteps:
CONFIG
S1 S2 R C W
O/B
GY1W2 W3Y2
RESET CONFIG
FP
6. Maximum Heat Setpoint(55°Fto90°F)(13°Cto32°C)
 Adjusttocontrolthemaximumheatsettemperatureallowed.
 Presstheupordownbuttontoselect.
 Presstherightbuttontoadvancetothenextscreen.
7. Minimum Cool Setpoint(55°Fto90°F)(13°Cto32°C)
 Adjusttocontroltheminimumcoolsettemperatureallowed.
 Presstheupordownbuttontoselect.
 Presstherightbuttontoadvancetothenextscreen.
9. Temperature Sensor(1-4)
 1.Onlyon-boardsensordeterminesroomtemperature.
 2.Onlyremotesensordeterminesroomtemperature.
 3.Averagetemperatureofon-boardandremotesensor.
 4.Onlyon-boardsensorwillbeuseduntilNITEperiod,andthenonlyremote
sensorisused.

Note:If there is no remote sensor, option 1 must be selected.
 Presstheupordownbuttontoselect.
 Pressthecongurationbuttonfortwosecondstoexitconguration.
8. Room Temperature Offset(+9°Fto-9°F)(+4.5°Cto-4.5°C)
 Adjusttocalibratedisplayedroomtemperaturetomatchactualroomtemperature.

Note:When not set to 0, will display.
 Presstheupordownbuttontoselect.
 Presstherightbuttontoadvancetothenextscreen.
Configuration Mode Settings
ThesetupscreensforCongurationModeareasfollows:
1. Temperature Scale (ForC)
ChooseFahrenheitorCelsius.
 Presstheupordownbuttontoselect.
 Pressthe right buttontoadvancetothenextscreen.
2. 1
st
Stage Temperature Differential(1°Fto5°F)(0.5°Cto2.5°C)
Setthenumberofdegreesbetweenyour“setpoint”temperatureandyour“turnon”
temperature.
 Presstheupordownbuttontosetdifferentialvalue.
 Presstheright buttontoadvancetothenextscreen.
4. Staged Off Outputs
 Selectwhethertheoutputsforheatingandcoolingarestagedoffindependentlyor
aresatisedsimultaneously.
 1=outputsstagedoffindependently
 0=outputsoffsimultaneously
 Presstheupordownbuttontoset.
 Presstheright buttontoadvancetothenextscreen.
5. Minimum Deadband(1°Fto9°F)(1°Cto5°C)
 SettheminimumseparationbetweenheatsetpointandcoolsetpointinAuto
ChangeoverMode.
 Presstheupordownbuttontosetdeadbandvalue.
 Presstheright buttontoadvancetothenextscreen.
3. 2
nd
Stage Temperature Differential(1°Fto5°F)(0.5°Cto2.5°C)
 Setthenumberofdegreesbetweenwhenstage1turnsonandwhenstage2turnson.
 Presstheupordownbuttontosetdifferentialvalue.
 Presstheright buttontoadvancetothenextscreen.
Wiring Diagrams
Conguration
switch
Resetswitch
Right(fan)button
Downbutton
Upbutton
S1 S2 R C GY1 W2 Y2
RESET CONFIG
Mode of Operation
The910121748isaprogrammable,manualorautochangeover,2-stageheat,2-stagecoolthermostat.Anoutdoor
sensorcanbeusedtomonitortheoutdoortemperature.
Thethermostatactivatestheheatingappliancewhentheroomtemperatureisbelowthesetheattemperature(by
thedifferentialtemperature).The910121748willstopoutputtingwhenthecallforheathasbeensatised.
Whentheroomtemperatureisgreaterthanthesetcooltemperature(bythedifferentialtemperature),thecooling
deviceisactivated.The910121748willstopoutputtingwhenthecallforcoolingissatised.
The910121748hasvepossibleoperatingmodes:OFF,Heat,Cool,Heat & Cool,andProgrammode.Inoff
mode,thethermostatwillnotturnonheatingorcoolingdevices.Themanualfancanbeturnedoninalloperating
modesusingthefanbutton.Inheatmode,thethermostatcontrolstheheatingsystem.Inthecoolmode,the
thermostatcontrolsthecoolingsystem.Inheat&coolmode,thethermostatcontrolsboththeheatingandcooling
systems.Inprogrammode,thethermostatwillautomaticallybecontrolledbythesetprogram.Programmodecan
functionwithheatmode,coolmode,orheat&coolmode.Theclockdisplayalternateswiththesettemperature
displayforheat&coolmode.
Theprogramschedulecanbeoverriddenbychangingthesettemperature(upordownbutton).Thisputsthe
910121748thermostatintoa2-hourtemporaryhold.After2hours,itwillautomaticallyreturntotheprogram
schedule.
TheprogrammablefanfeaturecanbeusedtorecirculateairwhileinProgrammode.Itisactivatedduringthe
programschedulesetup.
PressingtheUPandDOWNbuttonssimultaneouslyfor2secondsthenreleasingthemcausesthethermostatto
outputfromthe“O”terminalfor5seconds.“Or”willshowonthedisplay.Thiswillresultintheunitgoingintoanight
set-backoverride.
PressingtheUPandDOWNbuttonssimultaneouslyfor5secondscausesthethermostattooutputfromthe“O”
terminalfor10seconds.“rS”willshowonthedisplay.Thiswillresultintheunitbeingreset.
Button Functions
UP–Usedtoincreasethetime,settemperaturesandtoadjustconguration
settings.
DOWN–Usedtodecreasethetime,settemperaturesandtoadjust
congurationsettings.
SYS (left)– UsedtochangefromOFF,HEAT,COOLandAUTOchangeover
modes
FAN (right)–Usedtoturnonandofftheindoorfan.
PROG (SYS and FAN)–Usedtochangefromprogramoperationtomanualoperation.
DOWN and SYS–Pressedsimultaneouslytodisplayoutdoorremotetemperatureifremotesensoris
connected.
UP and DOWN– Usedtooverridenightsetbackorresettheunit.
PROG
FAN
(right)
Down
button
Up
button
SYStem
(left)
TerminalsS1andS2canbeusedforanindoorremotesensor.
Theindoorremotesensorisusedtoreadtheindoortemperature
inadifferentlocation.Thisisbenecialwhenthethermostatisnot
mountedintheideallocation.TheremotesensorP/Nis910116773.
1. Removecoverfromremotesensorhousing.
2. Selectanappropriatelocationformountingtheremotesensor.
3. Mountremotesensorunitusinghardwareprovided.
4. Installtwostrandshieldedwirebetweenremotesensorand
thermostat.Shieldedwireisrecommended.
Do notrunremotesensorwireinconduitwithotherwires.
 • Wire 1shouldrunbetweentheS1terminalonthethermostat
andtheS1terminalontheremotesensor
 • Wire 2shouldrunbetweentheS2terminalonthethermostatandtheS2terminalontheremotesensor
 • ConnecttheshieldingofthewiretotheS2terminalonthethermostat
5. Congurethethermostattooperatewiththeremoteindoorsensor(seeCongurationModesetting9).
Remote Sensor Installation (Optional)
Note: Remote or outdoor sensor reading can be
displayed by simultaneously pressing the
Down and SYS buttons.
Remote Sensor:
(Contact Daikin for optional remote sensor.)
Terminal Designator Descriptions
R–24VAChot
C–24VACcommon
W1–1ststageheat
Y1–1ststagecool
W2–2ndstageheat
Y2–2ndstagecool
 G – Fan
 A – Alarminput
 L – Statusinput
 O – Override/reset
L
S1
S2
R
C
W1
Y1
W2
Y2
G
A
O
O
G
Y1
Y2
W1
W2
A
R
C
4
3
2
1
5
O
G
Y1
Y2
W1
W2
A
R
C
ICM
Thermostat
Terminal
TB2
TB1
ICM
Thermostat
Terminal
WSHP Main Control Board
Terminals TB1 and TB2
Daikin P/N (910121748)
Installation, Operation & Application Guide
• 7-Day, 5-2-Day or 5-1-1-Day
Programmable
• Configurable
• 2-Stage Heat/2-Stage Cool Systems
• Large Display With Backlight
• Selectable Fahrenheit or Celsius
• Status Indicator Light
• Relay Outputs
(minimum voltage drop in thermostat)
• Remote Sensor Compatible
Version B: 10-15-13
2 Heat/2 Cool, 7-Day Programmable, Auto Changeover, Hardwired
Programmable Electronic Thermostat

Daikin 910121748 Specifications

General

Model Number	910121748
Category	Thermostat
Compatibility	Daikin HVAC systems
Display	LCD
Programmable	Yes

Summary

Thermostat Installation

To Remove Existing Thermostat

Steps to safely disconnect and remove the old thermostat unit before installation.

To Install Thermostat

Instructions for mounting the new thermostat base and connecting wires to terminals.

Remote Sensor Installation

Guide for connecting an optional remote sensor for temperature readings in other locations.

Thermostat Operation and Configuration

Wiring Diagrams

Visual representation of terminal connections for various system types and their descriptions.

Configuration Mode

Process for setting thermostat parameters to match system requirements and preferences.

Mode of Operation

Explanation of the thermostat's operating modes: OFF, Heat, Cool, Heat & Cool, and Program.

Button Functions

Description of the purpose and operation of each thermostat button on the control panel.

Operating Modes

OFF Mode

Description of the OFF mode where neither heating nor cooling devices are activated.

Heat Mode

Explanation of how the thermostat controls the heating system operation.

Cool Mode

Explanation of how the thermostat controls the cooling system operation.

Cool and Heat Mode (Auto Changeover)

How the thermostat automatically controls both heating and cooling systems.

Program Mode

How the thermostat operates automatically based on the programmed schedule.

Programming and Testing

Setting the Time and Day of the Week

Procedure for setting the current time and day for accurate program scheduling.

Factory Preprogramming

Overview of the default programmed schedule provided by the manufacturer.

Personal Program Schedule

Template to record custom programmed heating and cooling schedules.

Testing the Thermostat

Steps for verifying proper operation of heating, cooling, and fan functions.

Troubleshooting

Troubleshooting

Common symptoms and their corresponding remedies for thermostat issues.