OPERATION GUIDE

Multi-stage Electronic DigitalThermostat

1F91-71

WHITE-RODGERS

Operator: Save this booklet for future use!

2

Please read this manual thoroughly before operating or programming your thermostat. If you havequestions, you may write to our Technical Service Department at the address shown on the backcover of this booklet.

About Your New Thermostat . . .

Your new Digital COMFORT SET II Multi-stage Thermostat uses the technology of a solid-statemicrocomputer to provide precise time/temperature control. The COMFORT SET II Thermostatoffers you the flexibility to design heating and cooling programs that fit your needs.

3

In This Guide . . .YOUR NEW THERMOSTAT’S

FEATURES ........................................... 4OPERATING YOUR THERMOSTAT ........ 5

PARTS OF THE THERMOSTATThe Back Of the Thermostat BodyThe DisplayThe Thermostat Buttons

OPERATING FEATURES

PROGRAMMING YOURTHERMOSTAT ................................... 17PLANNING FOR YOUR NEEDSENTERING YOUR PROGRAM

Set Current Time and DayEnter Heating ProgramEnter Cooling Program

CHECK YOUR PROGRAMMINGQUESTIONS AND ANSWERS ............... 28

Operator: Save thisbooklet for future use!

4

• Computed Energy Management Recovery(EMR)

• Automatic changeover (operator selectable)

• Five-day/two-day programming capability

• Simultaneous heat and cool program stor-age

• Preprogrammed temperature control

• Four separate time and temperature set-tings per 24-hour period

• Armchair programming capability

• Audio and visual prompting during pro-gramming

• Programmable blower control

• Two hour temperature override

• Manual program override (HOLD tempera-ture)

• “Advance Program” button

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

• Adjustable cycle times

• 9 volt Energizer® alkaline battery backup

• Compressor short cycle protection

• Blower delay in the cooling cycle

• Up to three stages of heat and up to twostages of cool

• Temperature range 40° to 99°F• °F/°C convertibility

• Compatible with Remote Sensor (optional)

YOUR NEW THERMOSTAT’S FEATURES

5

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

Your thermostat consists of two parts: the ther-mostat body and the subbase .

Use SYSTEMSWITCH to turn thermostat OFF be-

fore removing or attaching the thermo-stat body. Equipment damage and/orpersonal injury could occur.

OPERATING YOUR THERMOSTATThe subbase is attached to the wall, but you canremove the thermostat body for easy program-ming. To remove the thermostat body from thesubbase, grasp the thermostat body and gentlypull it out from the bottom of the subbase, thenpivot up. To attach the thermostat body, line upthe four terminal pins on the upper section of thethermostat back with the matching connectoron the subbase. Insert these, then gently pivotthe thermostat body down to connect the ninepin connectors on the lower portion of the ther-mostat back. Gently push until the snap con-nectors engage. DO NOT FORCE OR PRYTHE THERMOSTAT, as this may damagethe unit.

CAUTION!

6

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 display

PARTS OF THE THERMOSTAT

The Back of the Thermostat Body

Turn the thermostat body over. On the back arethe 9 volt Energizer® alkaline battery and theoption switches.

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 a fac-tory preprogrammed heating temperatureof 64°F and a cooling temperature of 82°Fafter power is restored. You must repro-gram the thermostat if this happens.

BACK OF THERMOSTAT BODY

Option switches 9-pin connector

4-pin connector Battery

7

light and audio prompting, which work onlyon 24 VAC power. If the word BAT is dis-played continuously (non-flashing), the ther-mostat is not being supplied with 24 VACpower and is being powered by the batteryalone.

Use SYSTEMSWITCH to turn thermostat OFF be-

fore removing thermostat from the wallto replace the battery.

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

CAUTION!

8

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,

OFF, COOL, AUTO, HOLD). During pro-gramming, the program period 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).

3 Displays the setpoint temperature.

4 5 DAY indicates that the displayed program

is the weekday program. 2 DAY indicatesthat the displayed program is the weekendprogram.

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 heating orcooling system).

9

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

54

FAN FANBAT

ON /AUTO

5 DAY FAN

10

The Thermostat Buttons

7 Sets the system mode (HEATing, 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 (when HOLDis displayed).

15 Used to advance thermostat program to the

next program period (for example, from theMOR program to the DAY program).

16 (Blue arrow) Lowers temperature setting

(40°F or 4°C minimum).

17 (Red arrow) Raises temperature setting

(99°F or 37°C maximum)

11

18 The red light is on when the 1st stage

heating/cooling system is operating. The

yellow light is on when the 2nd or 3rd stageheating/cooling system is operating.

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

12

OPERATING FEATURES

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

• COMPUTED ENERGY MANAGEMENTRECOVERY (EMR) - The thermostat’s mi-crocomputer automatically calculates thetime it will take to change the temperatureto the next program setting. Then the ther-mostat will activate the heating or coolingsystem to change the temperature so thatthe desired temperature is reached at thebeginning of the next program period. As anexample of this feature, assume that youhave programmed your thermostat to pro-vide an overnight heating temperature of62°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 not alreadybeen done. To do this, turn off 24 VACpower to the thermostat. Then, remove thethermostat body from the wall. Check theposition of switch #4 (the last switch on theright). If it is ON (up), simply put the thermo-stat back on the wall and restore 24 VACpower. If the switch is OFF (down), use a

13

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 not allowthe temperature separation between the high-est heat setting and the lowest cool setting to beless than 1°F. For example, if the highest heatsetting is 76°F, the lowest cool setting cannotbe below 77°F (see diagram below).

pencil or small screwdriver to move theswitch to the ON position (see figure atright). Leave the battery out of the thermo-stat for at least two minutes , to allow thethermostat to reset itself. DO NOT MOVEANY OTHER OPTION SWITCH, as it mayaffect thermostat operation. Replace thebattery, put the thermostat back on the wall,and restore 24 VAC power. To set the ther-mostat for automatic changeover after pro-

gramming, press SYSTEMSWITCH to set the ther-

mostat to AUTO (the setpoint display isblank in the AUTO mode). The system willnow automatically switch between heatingand cooling depending on the actual roomtemperature.

797877767574

COOLING TEMPERATURES

HEATING TEMPERATURES

DEAD BAND 1°F

ON

1 2 3 4

14

• 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 thermostatcan hold any temperature within its rangefor an indefinite period, without reverting to

the program. Press HOLDTEMP . HOLD will be

displayed. Then choose the desired holdtemperature by pressing or .The thermostat will hold the room tempera-ture at the selected setting until you press

RUNPRGM to start program operation again. This

feature is ideal for energy conservationwhen the building is unoccupied for anextended period of time.

• “ADVANCE PROGRAM” BUTTON —

Press ADVPRGM to advance the thermostat pro-

gram to the next period (such as from theMOR program period to the DAY programperiod). This change remains in effect untilthe next program period begins.

• °F/°C CONVERTIBILITY — Press TIMEFWD and

TIMEBACK at the same time until the temperature

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

• ADJUSTABLE HEATING AND COOLINGCYCLE TIMES (ANTICIPATION) — If theheating/cooling system is turning on and off

15

too often (short cycles) or not often enough(long cycles), you may want to adjust theanticipation setting.

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

To adjust anticipation, press SETCLOCK and SET

DAY

at the same time. The display will showHEAT 8 (this is the factory preprogrammedheating anticipation setting). You may se-lect any anticipation setting from 4 to 40.Whenever adjusting anticipation, increaseor decrease the displayed number by onlyone or two digits, then let the system run fora while to see if the adjustment is sufficient.

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 cooling anticipation, pressSET

CLOCK and SETDAY at the same time again. The

display will show COOL 14 (factory prepro-

grammed cooling anticipation). Use the TIMEFWD

and TIMEBACK buttons to adjust anticipation. Press

RUNPRGM to return to your program.

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

CAUTION!

16

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

• BACKLIT DISPLAY — When you pressany button on the thermostat, the display islit 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 cycling,this thermostat has a built-in delay of 5minutes between cooling cycles. The blowerwill operate during a time delay, but the aircirculated will not be cooled. The followingmay cause a time delay in COOL:

a) Return of power after a power outage.

b) Pressing SYSTEMSWITCH to change operating

modes.

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

• SYSTEM INDICATOR LIGHTS — The redindicator light comes on whenever the firststage heating or cooling system is operat-ing. The yellow indicator light comes onwhen the second or third stages of heatingor cooling are operating.

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

ture for the time period, press FANSWITCH until

17

FAN is displayed. To override constant

fan, press FANSWITCH until FAN is dis-

played.

PROGRAMMING YOUR THERMOSTATNow you are ready to program your thermostat.This section will help you plan and program yourthermostat to meet your needs.

For maximum comfort and efficiency, keep thefollowing guidelines in mind when planning yourprogram.

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

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

PLANNING FOR YOUR NEEDS

This thermostat will store separate heating andcooling programs for five-day (weekday) andtwo-day (weekend) operation. Usually, the five-day program is set to run Monday throughFriday, and the two-day program is set to runSaturday and Sunday. However, you maychoose any five consecutive days to be yourweekday program days (such as Sunday throughThursday; in this case, your weekend programwould run on Friday and Saturday).

18

First, you should answer the following ques-tions to help you decide what your needs are. Ifyou are using the thermostat for a commercialapplication (a store, office building, etc.), an-swer questions 1 through 4. If you are using thethermostat in your home, answer questions 5through 8. Keep in mind that you should plan forboth weekday and weekend programs.

FOR COMMERCIAL APPLICATIONS:

1a. What time does the first person arrive at thebuilding in the morning?

b. What temperature should the building be atthis time? (heating? cooling?) These will beyour MOR (morning) temperature settings.

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

b. What temperature should the building be atthis time? These will be your DAY tempera-ture 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 be atthis time?

4a. What time does the building become va-cant?

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

IN YOUR HOME:

5a. What time does the first person get up in themorning?

19

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

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 tempera-ture settings.

7a. What time does the first person arrive homein 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 bed atnight?

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 at the top of the nextpage. If this program will suit your needs, simply

press RUNPRGM to begin running the factory preset

program.

If you want to change the preprogrammed timesand temperatures, do the following.

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).

NOTE

797877767574

COOLING TEMPERATURES

HEATING TEMPERATURES

DEAD BAND 1°F

20

Determine the time periods and heating andcooling temperatures for your weekday pro-gram. You must program 4 periods for each day(MOR, DAY, EVE, and NHT). However, youmay use the same heating and cooling tem-peratures for consecutive time periods. Youcan choose start times, heating temperatures,and cooling temperatures independently forboth weekday and weekend programs (for ex-ample, you may select 5:00 AM and 70° as the

weekday MOR heating start time and tempera-ture, and choose 7:00 AM and 76° as theweekday MOR cooling start time and tempera-ture). Use the following table to plan your pro-gram time periods, and the temperatures youwant during each period. You may also want tolook at the sample program table to get an ideaof how the thermostat can be programmed.

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

21

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

22

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°

23

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).

NOTE

NOTE

24

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 the alter-nating time/temperature display. To resume

programming after this happens, press VIEWPRGM

until you are at the point where you stoppedprogramming. Then you may continue to enteryour programs normally. If you want 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 programmedtemperature.

EXAMPLE: 5 DAY

25

This display window shows that for theweekday MOR period, the start time is 5:00AM, and 70° is the programmed tempera-ture (this example reflects factory prepro-gramming).

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

program, press TIMEFWD or TIME

BACK until your se-

lected time appears. The time will change in15 minute increments.

4. Press or until you reach yourselected weekday MOR heating tem-perature.

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 for weekdayDAY 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 .

26

Enter Cooling Program

If outside temperature is below 50 °F, werecommend that you remove the ther-mostat from the wall before proceedingwith the following steps to program cool-ing temperatures. Personal injury orproperty damage may occur due to airconditioner compressor slugging. Afresh 9 volt Energizer ® alkaline batterymust be installed to perform off-wallprogramming. Programming away fromthe wall should prevent accidental com-pressor operation. BE SURE SYSTEMSWITCH IS SET TO OFF POSITION BE-FORE REATTACHING THE THERMO-STAT TO THE SUBBASE!

1. Press SYSTEMSWITCH until COOL appears.

2. Enter your cooling program by followingthe procedure for entering your heatingprogram.

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 se-quence for weekday MOR, DAY, EVE,and NHT, then for weekend MOR, DAY,EVE, and NHT.

CAUTION!

27

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 COMPLETELYPROGRAMMED AND READY TO AUTOMATI-CALLY PROVIDE MAXIMUM COMFORT ANDEFFICIENCY!

Press SYSTEMSWITCH until OFF is displayed. Reattach

thermostat to subbase. Then press SYSTEMSWITCH to

select the operation mode you want (HEAT,

COOL, AUTO). Press FANSWITCH until FAN is

displayed (automatic cycling).

28

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 weekday

QUESTIONS AND ANSWERSDAY, which means the temperature will notchange when the EVE period begins. SeePROGRAMMING YOUR THERMOSTAT .

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 thermostat willenter the HOLD mode and maintain a con-stant temperature. The display will changeto the time/temperature mode. To resume

programming, press VIEWPRGM until you return to

the point where you stopped programming.Then you may continue to program thethermostat normally. If you want to stop

29

programming at this point, press RUNPRGM to

start the normal program function. See PRO-GRAMMING YOUR THERMOSTAT .

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 tempera-ture of 64°F and a cooling temperature of82°F until you reenter your program. Set-point temperature will not be displayed.

If a fresh 9 volt Energizer® alkaline batteryis installed, the program will be maintainedfor 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 programmed inthe 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 thermostat andthe display is blank or frozen, static dis-charge is probably the cause.

During periods of low humidity (especiallyduring cold weather), you may feel or see aspark discharge when you touch the ther-mostat. This may cause the program to belost or the thermostat to display incorrectly.To correct this, remove the thermostat from

30

the wall and disconnect the battery. Waitabout one minute, then reconnect the bat-tery. The thermostat will revert to the fac-tory preset program until you reprogram thethermostat. If you don’t want to reprogram

the thermostat immediately, press SYSTEMSWITCH

until OFF is displayed and replace the ther-

mostat on the wall. Then press RUNPRGM to begin

the factory preset program. Or you mayreprogram the thermostat, then replace iton 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 selected cool-ing temperature, you cannot select a heat-ing temperature any higher than 69°F). Ifsuch 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 .

31

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 is on the walland 24 VAC power is present to the ther-mostat. These features will not work onbattery power alone. See OPERATINGYOUR THERMOSTAT.

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

The 9 volt battery installed in the thermostatis low and should be replaced with a fresh9 volt Energizer® alkaline battery. See OP-ERATING 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. Ifthe system is still not running, read thefollowing cautionary statement on thenext page . Then, if conditions permit ,use the or buttons to move thetemperature above or below the setpointtemperature. See OPERATING YOURTHERMOSTAT.

32

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 slugging.

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

There may be a number of causes forthis situation. The following are primaryreasons.

• The EMR function is operating. The EMRfunction will bring the system on auto-matically to bring the temperature to theselected level by the beginning of thenext program period. See OPERATINGYOUR THERMOSTAT.

• You have programmed the incorrect dayor time. Check your programming (besure that the times you programmed arecorrect 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 oper-ating; wait about 5 minutes for system tobegin running. See OPERATING YOURTHERMOSTAT.

CAUTION!

33

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 continues toblow 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). Tochange anticipation settings, see OPER-ATING YOUR THERMOSTAT .

14. Between heating and cooling seasons, Iwant to turn my system off. Can I do thiswithout affecting my thermostat pro-gramming?

Any time you wish to turn your system off,

simply press SYSTEMSWITCH until the display shows

OFF. This will not affect your thermostat’sprogramming in any way. To turn the sys-

tem back on, press SYSTEMSWITCH until HEAT,

COOL, etc. is displayed. The system willautomatically begin operating according tothe current thermostat program, unless thethermostat is in the HOLD mode. See OP-ERATING YOUR THERMOSTAT .

34

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 the clock, follow the instructionsfor setting current time and day (see EN-TERING YOUR PROGRAM). Thermostatprogramming 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 from thewall, the program will be retained for ap-proximately one minute if there is no bat-tery installed or if the installed battery isdead. If you are changing the battery afterseeing 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 lose yourthermostat programming. After installing anew battery, follow the procedures inCHECK YOUR PROGRAMMING to deter-mine whether your programming was main-tained.

35

If the thermostat maintains programming,

press SYSTEMSWITCH until OFF is displayed, put

the thermostat back on the wall, press

SYSTEMSWITCH again to select the operating mode

you want, then press RUNPRGM to start program

operation. If the program is lost, reprogramthe thermostat. See PROGRAMMINGYOUR THERMOSTAT.

If you need further information on programming or operation, youmay write to our Technical Service Department at the addressshown below.

Part No. 37-4739CReplaces 37-4739B

9606

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