OPERATION GUIDE

Multi-stage/Heat Pump ElectronicDigital Thermostat

1F92-71

WHITE-RODGERS

Operator: Save this booklet for future use!

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Please read this manual thoroughly before operating or programming your thermostat. If youhave questions, you may write to our Technical Service Department at the address shown onthe back cover of this booklet.

About Your New Thermostat . . .

Your new Digital COMFORT SET II Multi-stage/Heat Pump Thermostat uses the technology ofa solid-state microcomputer to provide precise time/temperature control. The COMFORT SETII Thermostat offers you the flexibility to design heating and cooling programs that fit your needs.

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In This Guide . . .

Operator: Save thisbooklet for future use!

YOUR NEW THERMOSTAT’SFEATURES ........................................... 4

OPERATING YOUR THERMOSTAT ........ 5PARTS OF THE THERMOSTAT

The Back Of the Thermostat BodyThe DisplayThe Thermostat Buttons

OPERATING FEATURES

PROGRAMMING YOURTHERMOSTAT ................................... 18PLANNING FOR YOUR NEEDSENTERING YOUR PROGRAM

Set Current Time and DayEnter Heating ProgramEnter Cooling Program

CHECK YOUR PROGRAMMINGQUESTIONS AND ANSWERS ............... 29

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YOUR NEW THERMOSTAT’S FEATURES

• Computed Energy Management Recov-ery (EMR)

• Automatic changeover (operator select-able)

• Five-day/two-day programming capability• Up to 3 stages of heat and up to 2 stages

of cool• Two hour temperature override• Manual program override (HOLD tempera-

ture)• “Advance Program” button• Simultaneous heat and cool program stor-

age• Four separate time and temperature set-

tings per 24-hour period• Armchair programming capability

• Backlit LCD displays continuous setpoint,time, and room temperature

• Adjustable cycle times• 9 volt Energizer® alkaline battery backup• Compressor long term cycle protection• Compressor short cycle protection• Blower delay in the cooling cycle• Preprogrammed temperature control• Audio and visual prompting during opera-

tion• Programmable blower control• Temperature range 40° to 99°F• °F/°C convertibility• Compatible with optional Remote Sensor• Electric Heat (installer-selectable)

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OPERATING YOUR THERMOSTAT

Before you begin programming your new ther-mostat, you should be familiar with its featuresand with the display and the location andoperation of the thermostat buttons. The infor-mation in this section will help you becomefamiliar with your thermostat so that you caneasily program it.

Your thermostat consists of two parts: thethermostat body and the subbase .

Use SYSTEMSWITCH to turn thermostat OFF

before removing or attaching the ther-mostat body. Equipment damage and/or personal injury could occur.

The subbase is attached to the wall, but youcan remove the thermostat body for easy pro-gramming. To remove the thermostat bodyfrom the subbase, grasp the thermostat bodyand gently pull it out from the bottom of thesubbase, then pivot up. To attach the thermo-stat body, line up the four terminal pins on theupper section of the thermostat back with thematching connector on the subbase. Insertthese, then gently pivot the thermostat bodydown to connect the nine pin connectors on thelower portion of the thermostat back. Gentlypush until the snap connectors engage. DONOT FORCE OR PRY THE THERMOSTAT,as this may damage the unit.

CAUTION!

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PARTS OF THE THERMOSTAT

The Back of the Thermostat Body

Turn the thermostat body over. On the backare the 9 volt Energizer® alkaline battery andthe option switches.

Use SYSTEMSWITCH to turn thermostat OFF

before removing thermostat from thewall to replace the battery.

CAUTION!

BACK OF THERMOSTAT BODY

Option switches 9-pin connector

4-pin connector Battery

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1. The 9 volt Energizer® alkaline battery pro-vides power to the thermostat when the24 VAC power is interrupted (for example,when you remove the thermostat from thewall for programming). A fresh battery willmaintain the stored program for approxi-mately one week. If power loss is longenough for the program to be lost, thethermostat will automatically maintain afactory preprogrammed heating tempera-ture of 64°F and a cooling temperature of82°F after power is restored. You mustreprogram the thermostat if this happens.

If the word BAT is flashing in the displaywindow, the battery is low and should bereplaced with a fresh 9 volt Energizer®

alkaline battery. The battery will providepower for all functions except the displaylight and audio prompting, which work onlyon 24 VAC power.

2. You may adjust option switch #4 for auto-matic changeover from heating to cooling(see OPERATING FEATURES ).

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3 Displays the setpoint temperature.

4 5 DAY indicates that the displayed pro-

gram is the weekday program. 2 DAYindicates that the displayed program is theweekend program.

5 The word BAT flashes on the display when

the 9 volt alkaline battery is weak andshould be replaced.

6 FAN is displayed when the blower is

operating continuously, regardless of heat-ing or cooling system cycling. FAN isdisplayed during automatic fan operation(when the blower cycles with the heatingor cooling system).

Other than and , the buttons arelocated behind the thermostat door. To openthe door, use your fingernail in the indentationat the top center of the door. Pull the door out,then swing the door down on its hinges.

Following are brief descriptions of the displayand the thermostat buttons.

The Display

1 Continuously displays system mode

(HEAT , EMER, OFF, COOL , AUTO ,HOLD). During programming, the programperiod is displayed (MOR, DAY, EVE,NHT).

2 Alternately displays room temperature (Fdenotes degrees Fahrenheit and C de-notes degrees Celsius) and time of day (Adenotes AM time and P denotes PM time).

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SYSTEMSWITCH

FANSWITCH

HEAT/OFF/COOL/AUTO

TIMEFWD

TIMEBACK

SETCLOCK

SETDAY

VIEWPRGM

RUNPRGM

HOLDTEMP

ADVPRGM

DIGITAL MULTI-STAGE COMFORT-SET IIW H I T E - R O D G E R S

1 2 3

4 6 6

2 DAY 5 DAY

2

3

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FAN FANBAT

ON /AUTO

5 DAY FAN

EMER. PUMP

MALF. AUX.

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The Thermostat Buttons and Lights

7 Sets the system mode (HEAT ing,

EMERgency backup system, OFF,COOLing, or AUTOmatic changeover [userselectable feature]).

8 Selects fan operation (see #6, above). This

button is also used to program the fan to runcontinuously during a program period.

9 Runs display forward or backward through

time, day, or anticipation settings duringprogramming.

10 Used with TIMEFWD and TIME

BACK to set current time

and day of the week.

11 Used during programming to set the day of

the week. Also used with SETCLOCK to enter

anticipation setting mode.

12 Used to initiate or review thermostat pro-

gramming.

13 Used to start program operation after pro-

gramming. Also used to return thermostatto program operation after being in HOLDmode.

14 Used to manually override programming

to hold at a selected temperature (whenHOLD is displayed).

15 Used to advance thermostat program to

the next program period (for example,from the MOR program to the DAY pro-gram).

16 (Blue arrow) Lowers temperature setting

(40°F or 4°C minimum).

17 (Red arrow) Raises temperature setting

(99°F or 37°C maximum)

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heat pump manufacturer’s operatingmanual). A continuous (non-flashing)PUMP light indicates that the heat pumpcompressor is functioning — a flashingPUMP light indicates that the compressoris locked out. AUX light indicates that theauxiliary system is operating.

18 EMER light indicates that the system is in

the emergency mode (the heat pump com-pressor is off and the auxiliary system ismaintaining setpoint temperature — thereis a 5 to 10 minute startup delay on the firstemergency cycle). MALF light indicates aheat pump system malfunction (refer to

SYSTEMSWITCH

FANSWITCH

TIMEFWD

TIMEBACK

SETCLOCK

SETDAY

VIEWPRGM

RUNPRGM

HOLDTEMP

ADVPRGM

IIW H I T E - R O D G E R S

10 11 12 13 14 15

16 17 18

9

7

8

HEAT/OFF/COOL/AUTO

DIGITAL MULTI-STAGE COMFORT-SET

ON /AUTO

5 DAY FAN

EMER. PUMP

MALF. AUX.

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OPERATING FEATURES

Now that you are familiar with the thermostatdisplay and buttons, read the following infor-mation to learn about the many features of thethermostat.

• COMPUTED ENERGY MANAGEMENTRECOVERY (EMR) - The thermostat’smicrocomputer automatically calculatesthe time it will take to change the tempera-ture to the next program setting. Then thethermostat will activate the heating or cool-ing system to change the temperature sothat the desired temperature is reached atthe beginning of the next program period.As an example of this feature, assume thatyou have programmed your thermostat toprovide an overnight heating temperatureof 62°F, and that during the next program

period, beginning at 6:00 AM, you haveprogrammed a temperature of 70°F. Thethermostat will automatically activate theheating system at about 5:00 AM, so thatthe programmed 70°F temperature isreached by about 6:00 AM.

• AUTOMATIC CHANGEOVER — You canset the thermostat to automatically switchthe system from heating to cooling asneeded. First, you must move option switch#4 (located on the back of the thermostatbody) to the ON position, if it has notalready been done. To do this, turn off24 VAC power to the thermostat. Then,remove the thermostat body from the wall.Check the position of switch #4 (the lastswitch on the right). If it is ON (up), simplyput the thermostat back on the wall andrestore 24 VAC power. If the switch is OFF

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Automatic Changeover (ON)

Switch #1 set at installation (DO NOT CHANGE)Switch #2 set at installation (DO NOT CHANGE)Switch #3 set at installation (DO NOT CHANGE)Switch #4 ON

In the AUTO mode, the thermostat will notallow the temperature separation betweenthe highest heat setting and the lowest coolsetting to be less that 1°F. For example, if thehighest heat setting is 76°F, the lowest coolsetting cannot be below 77°F (see diagrambelow).

(down), use a pencil or small screwdriverto move the switch to the ON position (seefigure at right). Leave the battery out of thethermostat for at least two minutes , toallow the thermostat to reset itself. DONOT MOVE ANY OTHER OPTIONSWITCH, as it may affect thermostat op-eration. Replace the battery, reprogramthe thermostat if necessary, put the ther-mostat back on the wall, and restore24 VAC power. To set the thermostat forautomatic changeover after programming,

press SYSTEMSWITCH to set the thermostat to

AUTO (the setpoint display is blank in theAUTO mode). The system will now auto-matically switch between heating and cool-ing depending on the actual room tem-perature.

ON

1 2 3 4

797877767574

COOLING TEMPERATURES

HEATING TEMPERATURES

DEAD BAND 1°F

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you press RUNPRGM to start program operation

again. This feature is ideal for energyconservation when the building is unoccu-pied for an extended period of time.

• °F/°C CONVERTIBILITY — Press TIMEFWD

and TIMEBACK at the same time until the tem-

perature display is in °C (Celsius). Todisplay °F, repeat the process.

• ADJUSTABLE HEATING AND COOL-ING CYCLE TIMES (ANTICIPATION) —If the heating/cooling system is turning onand off too often (short cycles) or not oftenenough (long cycles), you may want toadjust the anticipation setting.

• TWO HOUR TEMPERATURE OVER-RIDE — Press or until thedisplay shows the temperature you want.The thermostat will override current pro-gramming and keep the room temperatureat the selected temperature for two hours.After two hours, the thermostat will auto-matically revert to the program.

• HOLD TEMPERATURE — The thermo-stat can hold any temperature within itsrange for an indefinite period, without re-

verting to the program. Press HOLDTEMP . HOLD

will be displayed. Then choose the desiredhold temperature by pressing or

. The thermostat will hold the roomtemperature at the selected setting until

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A cooling anticipation setting of lessthan 10 may cause decreased com-pressor life.

To adjust HEAT anticipation, press SETCLOCK

and SETDAY at the same time. The display will

show HEAT 18. You may select any antici-pation setting from 4 to 40 (note that foradd-on heat pump systems, a minimumanticipation of 10 is recommended) .Whenever adjusting anticipation, increaseor decrease the displayed number by onlyone or two digits, then let the system runfor a while to see if the adjustment issufficient. If the heat cycles are too short,

press TIMEFWD to increase the cycle time. If the

heat cycles are too long, press TIMEBACK to

decrease the cycle time. To set COOL

anticipation, press SETCLOCK and SET

DAY at the

same time again. The display will showCOOL 14 (factory preprogrammed cool-

ing anticipation). Use TIMEFWD and TIME

BACK to

adjust anticipation. To set AUXILIARYheat anticipation (not applicable to multi-

stage use), press SETCLOCK and SET

DAY at the

same time again. The display will showAUX 8 (factory preprogrammed auxiliary

anticipation). Use TIMEFWD and TIME

BACK to adjust

anticipation. Press RUNPRGM to return to your

program.

CAUTION!

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• LOW BATTERY INDICATOR — The wordBAT will flash on the display if the 9 voltalkaline battery is low and should be re-placed.

• AUDIO PROMPTING — Each time youpress a button, the thermostat will beep.

• BACKLIT DISPLAY — When you pressany button on the thermostat, the displayis lit for approximately eight seconds (thisfeature works only when the thermostat isattached to the wall and 24 VAC power ispresent to the thermostat).

• COMPRESSOR SHORT CYCLE PRO-TECTION — To protect your compressorfrom potential damage due to rapid cy-cling, this thermostat has a built-in delay of5 minutes between cooling cycles. Theblower will operate during a time delay, butthe air circulated will not be cooled. The

following may cause a time delay in COOLor HEAT:a) Return of power after a momentary

power outage.

b) Pressing SYSTEMSWITCH to change operating

modes.

c) Pressing or to create a callfor COOL or HEAT too soon after aprevious call.

During lockout in the HEAT mode, thegreen compressor (PUMP) LED will flash.During lockout in the COOL mode, theblower will operate, but compressor op-eration will be delayed.

Auxiliary heat is functional during the com-pressor lockout and can be used as neededto maintain room temperature.

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• COMPRESSOR LONG TERM CYCLEPROTECTION — If your system begins tooperate too soon after an extended poweroutage, the compressor may be damageddue to crankcase oil temperature change.This thermostat has a built-in time delay ofone hour less than the power loss (up to 12hours). When power is restored to thesystem, heaters in the system will begin toheat the crankcase oils. The thermostat’stime delay will lock out the compressor toprevent its operation until the compressoroil is sufficiently warmed. During the lock-out time period, the auxiliary heating sys-tem will operate to maintain setpoint tem-perature.

For example, if a power outage of threehours occurs, the compressor will be lockedout for two hours.

• SYSTEM INDICATOR LIGHTS — Thefour lights on the upper right part of thethermostat indicate system operation (seePARTS OF THE THERMOSTAT for spe-cific descriptions of what each light indi-cates).

• PROGRAMMABLE BLOWER CON-TROL — You may program the fan blowerto run continuously during any given pro-gram period, regardless of the cycling ofthe heating or cooling system. During pro-gramming, after entering the time and tem-

perature for the time period, press FANSWITCH

until FAN is displayed. To override con-stant fan, press until FAN is displayed.

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PROGRAMMING YOUR THERMOSTAT

Now you are ready to program your thermo-stat. This section will help you plan and pro-gram your thermostat to meet your needs.

For maximum comfort and efficiency, keep thefollowing guidelines in mind when planningyour program.

• When heating (cooling) your building, pro-gram the temperatures to be cooler(warmer) when the building is vacant orduring periods of low activity.

• During early morning hours, the need forcooling is usually minimal.

PLANNING FOR YOUR NEEDS

This thermostat will store separate heatingand cooling programs for five-day (weekday)and two-day (weekend) operation. Usually,the five-day program is set to run Mondaythrough Friday, and the two-day program is setto run Saturday and Sunday. However, youmay choose any five consecutive days to beyour weekday program days (such as Sundaythrough Thursday; in this case, your weekendprogram would run on Friday and Saturday).

First, you should answer the following ques-tions to help you decide what your needs are.If you are using the thermostat for a commer-cial application (a store, office building, etc.),

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answer questions 1 through 4. If you are usingthe thermostat in your home, answer ques-tions 5 through 8. Keep in mind that you shouldplan for both weekday and weekend programs.

FOR COMMERCIAL APPLICATIONS:

1a. What time does the first person arrive atthe building in the morning?

b. What temperature should the building beat this time? (heating? cooling?) Thesewill be your MOR (morning) temperaturesettings.

2a. What time do the building occupants reacha maximum activity level (using lights,equipment, meeting rooms, etc.)?

b. What temperature should the building beat this time? These will be your DAY tem-perature settings.

3a. What time do the building occupants reacha minimum activity level (limited personnelin building)? These will be your EVE(evening) temperature settings.

b. What temperature should the building beat this time?

4a. What time does the building becomevacant?

b. What temperature should the building beat this time? These will be your NHT (night)temperature settings.

IN YOUR HOME:

5a. What time does the first person get up inthe morning?

b. What temperature should the house be atthis time? These will be your MOR (morn-ing) temperature settings.

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6a. What time does the last person leave thehouse in the morning?

b. What temperature should the house be atthis time? These will be your DAY tem-perature settings.

7a. What time does the first person arrivehome in the evening?

b. What temperature should the house be atthis time? These will be your EVE (evening)temperature settings.

8a. What time does the last person go to bedat night?

b. What temperature should the house be atthis time? These will be your NHT (night)temperature settings.

Now look at the factory preprogrammed timesand temperatures shown below. If this pro-

gram will suit your needs, simply press RUNPRGM to

begin running the factory preset program.

If you want to change the preprogrammedtimes and temperatures, do the following.

Heating Program for ALL days of the Week: Cooling Program for ALL Days of the Week:

PERIOD TIME TEMP PERIOD TIME TEMPMORDAYEVENHT

5:00 AM9:00 AM4:00 PM10:00 PM

70707064

MORDAYEVENHT

5:00 AM9:00 AM4:00 PM10:00 PM

78827878

FACTORY PREPROGRAMMING

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To operate properly in the AUTO mode, theremust be a minimum 1 °F separation betweenthe highest heat temperature and the lowestcool temperature (see diagram below).

Determine the time periods and heating andcooling temperatures for your weekday pro-gram. You must program 4 periods for eachday (MOR, DAY, EVE, and NHT). However,you may use the same heating and coolingtemperatures for consecutive time periods.You can choose start times, heating tempera-tures, and cooling temperatures independently

for both weekday and weekend programs (forexample, you may select 5:00 AM and 70° asthe weekday MOR heating start time andtemperature, and choose 7:00 AM and 76° asthe weekday MOR cooling start time andtemperature). Use the following table to planyour program time periods, and the tempera-tures you want during each period. You mayalso want to look at the sample program tableto get an idea of how the thermostat can beprogrammed.

797877767574

COOLING TEMPERATURES

HEATING TEMPERATURES

DEAD BAND 1°F

NOTE

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WEEKDAY (5 DAY) WEEKEND (2 DAY)

StartTime Temperature

StartTime Temperature

MOR HEAT

DAY HEAT

EVE HEAT

NHT HEAT

MOR COOL

DAY COOL

EVE COOL

NHT COOL

Heating/Cooling Schedule Plan

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WEEKDAY (5 DAY) WEEKEND (2 DAY)

StartTime Temperature

StartTime Temperature

MOR HEAT

DAY HEAT

EVE HEAT

NHT HEAT

MOR COOL

DAY COOL

EVE COOL

NHT COOL

SAMPLEHeating/Cooling Schedule Plan

5:30 AM

8:00 AM

4:30 PM

11:00 PM

8:00 AM

12:00 PM

4:30 PM

11:00 PM

7:30 AM

2:00 PM

6:00 PM

12:00 AM

8:00 AM

2:00 PM

6:00 PM

12:00 AM

68°

66°

70°

66°

76°

78°

74°

78°

68°

70°

70°

66°

76°

74°

74°

78°

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NOTE

ENTERING YOUR PROGRAM

Follow these steps to enter the heating andcooling programs you have selected.

We recommend that you remove the thermo-stat from the wall for programming (especiallyfor entering cooling programming). A fresh 9volt Energizer® alkaline battery must be in-stalled to perform off-wall programming. BESURE SYSTEM SWITCH IS SET TO OFFPOSITION BEFORE REATTACHING THER-MOSTAT TO SUBBASE!

You cannot program the thermostat with theSYSTEM SWITCH in the AUTO position.

Set Current Time and Day

1. Press SETCLOCK once. The display will show

minutes only.

EXAMPLE:

2. Press and hold either TIMEFWD or TIME

BACK until you

reach the correct minutes.

3. Press SETCLOCK once. The display window will

show the hour only.

EXAMPLE:

4. Press and hold either TIMEFWD or TIME

BACK until you

reach the correct hour and AM/PM desig-nation (AM begins at midnight; PM beginsat noon).

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5. Press SETDAY once. The display will show the

day of the week as an abbreviation (MO forMonday, TU for Tuesday, etc.).

6. Press and hold either TIMEFWD or TIME

BACK until you

reach the current day of the week.

7. Press RUNPRGM once. The display will show the

correct time and room temperature alter-nately.

Enter Heating Program

During programming, if you don’t press anybuttons for 5 minutes, the thermostat will enterthe HOLD mode and will maintain a constanttemperature. The display will revert to thealternating time/temperature display. To re-sume programming after this happens, press

VIEWPRGM until you are at the point where you

stopped programming. Then you may con-tinue to enter your programs normally. If youwant to stop programming at any time, simply

press RUNPRGM to resume program operation.

1. Press SYSTEMSWITCH until HEAT is displayed.

2. Press VIEWPRGM once. 5 DAY (indicating week-

day program), and MOR, representingthe morning heating period, will appearin the display. Also displayed are thecurrently programmed start time for theMOR period and the currently pro-grammed temperature.

EXAMPLE: 5 DAY

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This display window shows that for theweekday MOR period, the start time is5:00 AM, and 70° is the programmed tem-perature (this example reflects factory pre-programming).

3. To change the displayed start time to yourselected start time for weekday MOR heat

program, press TIMEFWD or TIME

BACK until your

selected time is displayed. The time willchange in 15 minute increments.

4. Press or until you reach yourselected weekday MOR heating tempera-ture.

5. If you want the fan to run continuously

during this period, press FANSWITCH until

FAN is displayed.

6. Press VIEWPRGM . The currently programmed

start time and heating temperature forweekday DAY will be displayed.

7. Repeat steps 3 through 5 to select the starttime and heating temperature for the week-day DAY program.

8. Repeat steps 3 through 7 for the weekdayEVE and NHT heating programs.

9. After entering your weekday heating pro-gram, repeat steps 1 through 8 for yourweekend programming (keep in mind thatfor weekend programming, the displayshould be changed from 5 DAY to 2 DAY).

10. When you have completed entering your

heating program, press RUNPRGM .

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Enter Cooling Program

If outside temperature is below 50 °F,we recommend that you remove thethermostat from the wall before pro-ceeding with the following steps to pro-gram cooling temperatures. Personalinjury or property damage may occurdue to compressor operation in coldweather. A fresh 9 volt Energizer ® alka-line battery must be installed to per-form off-wall programming. Program-ming away from the wall should pre-vent accidental compressor operation.

USE SYSTEMSWITCH TO TURN THERMOSTAT

OFF BEFORE REATTACHING THETHERMOSTAT TO THE SUBBASE!

1. Press SYSTEMSWITCH until COOL is displayed.

2. Follow the same procedure used to enteryour heating program, using your chosencooling times and temperatures.

CHECK YOUR PROGRAMMING

Follow these steps to check your thermostatprogramming one final time before beginningthermostat operation.

1. Press SYSTEMSWITCH until HEAT is displayed.

2. Press and hold VIEWPRGM to view the heating

period times and temperatures in sequencefor weekday, then weekend MOR, DAY,EVE, and NHT program periods.

CAUTION!

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3. Press RUNPRGM .

4. Press SYSTEMSWITCH until COOL is displayed.

5. Repeat step 2 to check cooling tempera-tures.

6. Press RUNPRGM to begin program operation.

YOUR THERMOSTAT IS NOW COM-PLETELY PROGRAMMED AND READY TOAUTOMATICALLY PROVIDE MAXIMUMCOMFORT AND EFFICIENCY!

Press SYSTEMSWITCH until OFF is displayed. Reat-

tach thermostat to subbase. Then press

SYSTEMSWITCH to select the operation mode you

want (HEAT, COOL, AUTO). Press FANSWITCH

until FAN is displayed (automatic cycling).

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QUESTIONS AND ANSWERS

1. How can I permanently change a part ofmy program?

Press VIEWPRGM until you reach the time/tem-

perature schedule you want. Then press

or and TIMEFWD and TIME

BACK to change

the program. See PROGRAMMING YOURTHERMOSTAT.

2. How can I have no change in tempera-ture from one time period to another?

Simply select the same temperature foreach consecutive time period. For example,you may select the same weekday EVEcooling temperature as you did for week-day DAY, which means the temperature

will not change when the EVE period be-gins. See PROGRAMMING YOURTHERMOSTAT.

3. How can I finish my programming if thedisplay has already changed to time/temperature?

During programming, if no buttons arepressed for five minutes, the thermostatwill enter the HOLD mode and maintain aconstant temperature. The display willchange to the time/temperature mode. To

resume programming, press VIEWPRGM until you

return to the point where you stoppedprogramming. Then you may continue toprogram the thermostat normally. If you

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want to stop programming at this point,

press RUNPRGM to start the normal program

function. See PROGRAMMING YOURTHERMOSTAT.

4. What happens if the electricity goes offor is manually shut off?

If you have not installed a 9 volt alkalinebattery, the display will go blank and theprogram will be lost in approximately oneminute. When electricity is restored, thethermostat will maintain a heating tem-perature of 64°F and a cooling tempera-ture of 82°F until you reenter your pro-gram. Setpoint temperature will not bedisplayed.

If a fresh 9 volt Energizer® alkaline batteryis installed, the program will be maintained

for about one week with no 24 VAC powerpresent to the thermostat. See OPERAT-ING YOUR THERMOSTAT.

5. Why can’t I program the thermostat inthe AUTO mode?

The thermostat can only be programmedin the HEAT and COOL modes. See PRO-GRAMMING YOUR THERMOSTAT .

6. What can cause the thermostat displayto freeze or go blank?

A completely blank display may indicatethat power has been lost to the thermostatand the backup battery is also dead. How-ever, if there is power to the thermostatand the display is blank or frozen, staticdischarge is probably the cause.

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During periods of low humidity (especiallyduring cold weather), you may feel or seea spark discharge when you touch thethermostat. This may cause the programto be lost or the thermostat to displayincorrectly. To correct this, remove thethermostat from the wall and disconnectthe battery. Wait about one minute, thenreconnect the battery. The thermostat willrevert to the factory preset program untilyou reprogram the thermostat. If you don’twant to reprogram the thermostat immedi-

ately, press SYSTEMSWITCH until OFF is displayed

and replace the thermostat on the wall.

Then press RUNPRGM to begin the factory preset

program. Or you may reprogram the ther-mostat, then replace it on the wall.

To prevent further static discharge prob-lems, touch another object to release staticbuild-up before touching the thermostat.See OPERATING YOUR THERMOSTAT .

7. Why won’t the setpoint temperature goto the temperature I want?

In the AUTO mode, the highest heatingsetpoint temperature you select must be atleast 1°F lower than the lowest coolingsetpoint temperature you select (for ex-ample, if 70°F is your lowest selectedcooling temperature, you cannot select aheating temperature any higher than 69°F).If such a conflict exists, you must set thelowest cooling temperature higher in orderto set the heating temperature higher. Toset a lower cooling temperature, you mustselect a lower heating temperature. SeePROGRAMMING YOUR THERMOSTAT .

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8. Why doesn’t the display light come onwhen I press a button? Why don’t I heara beep when I press a button?

The display light and audio prompting(beep) only work when the thermostat ison the wall and 24 VAC power is present tothe thermostat. These features will notwork on battery power alone. See OPER-ATING YOUR THERMOSTAT .

9. The display is flashing BAT. What doesthis mean?

The 9 volt battery installed in the thermo-stat is low and should be replaced with afresh 9 volt Energizer® alkaline battery.See OPERATING YOUR THERMOSTAT .

10. Why won’t the system turn on, eventhough the thermostat display is func-tioning normally?

Either the compressor lockout feature is inoperation or the thermostat is not currentlycalling for heat or cool. Wait about 5 min-utes for the compressor lockout to expire.If the system is still not running, read thecautionary statement on the next page.Then, if conditions permit , use the or buttons to move the temperatureabove or below the setpoint temperature.See OPERATING YOUR THERMOSTAT .

33

If the outside temperature is below 50 °F,DO NOT use the button to movethe temperature below the setpoint tem-perature. Property damage may resultdue to compressor operation in coldweather.

11. Why doesn’t the temperature change atthe time I programmed?

There may be a number of causes for thissituation. The following are primary reasons.

• The EMR function is operating. TheEMR function will bring the system onautomatically to bring the temperatureto the selected level by the beginning ofthe next program period. See OPER-ATING YOUR THERMOSTAT .

• You have programmed the incorrectday or time. Check your programming(be sure that the times you programmedare correct AM or PM times). See PRO-GRAMMING YOUR THERMOSTAT .

• The thermostat is in the HOLD mode.

Press RUNPRGM to start program operation.

See OPERATING YOUR THERMO-STAT.

• The compressor lockout feature is op-erating; wait about 5 minutes for sys-tem to begin running. See OPERAT-ING YOUR THERMOSTAT.

CAUTION!

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12. Why does the blower fan keep runningafter the system has turned off?

• You have programmed the fan to runcontinuously during this period. SeePROGRAMMING YOUR THERMO-STAT.

• The blower delay feature is operating.This energy saving feature continuesto blow conditioned air through the ductsafter the system has turned off, ratherthan letting the air dissipate.

13. Why is the system turning on and off sofrequently (seldom)?

The anticipation setting is too low (high).To change anticipation settings, see OP-ERATING YOUR THERMOSTAT .

14. Between heating and cooling seasons,I want to turn my system off. Can I dothis without affecting my thermostatprogramming?

Any time you wish to turn your system off,

simply press SYSTEMSWITCH until the display

shows OFF. This will not affect yourthermostat’s programming in any way. To

turn the system back on, press SYSTEMSWITCH

until HEAT, COOL, etc. is displayed. Thesystem will automatically begin operatingaccording to the current thermostat pro-gram, unless the thermostat is in the HOLDmode. See OPERATING YOUR THER-MOSTAT.

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15. I live in an area where daylight savingstime is observed. How do I change thethermostat clock twice a year withoutaffecting thermostat programming?

To change your clock, follow the instruc-tions for setting current time and day. SeeENTERING YOUR PROGRAM. Thermo-stat programming is not affected when youchange the clock.

16. Do I have to reprogram my thermostatafter I change the battery?

When the thermostat is on the wall and thesystem has power, the thermostat is beingpowered by a 24 VAC source. If power islost, or if the thermostat is removed fromthe wall, the program will be retained forapproximately one minute if there is nobattery installed or if the installed battery isdead. If you are changing the battery after

seeing a flashing BAT on the display, theinstalled battery may be dead. If you re-move the old battery and install a fresh onewithin one minute, you should not loseyour thermostat programming. After in-stalling a new battery, follow the proce-dures in CHECK YOUR PROGRAMMINGto determine whether your programmingwas maintained. If the thermostat main-

tains programming, press SYSTEMSWITCH until

OFF is displayed, put the thermostat back

on the wall, press SYSTEMSWITCH to select the

operating mode you want, then press RUNPRGM

to start program operation. If the programis lost, reprogram the thermostat. SeePROGRAMMING YOUR THERMOSTAT .

Part No. 37-4741CReplaces 37-4741B

9606

If you need further information on programming or operation, you may writeto our Technical Service Department at the address shown below.

WHITE-RODGERS DIVISIONEMERSON ELECTRIC CO.9797 REAVIS ROADST. LOUIS, MISSOURI 63123-5398