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OPERATION GUIDE  
1F90W-51  
5 Day/2 Day Electronic  
Digital Thermostat  
WHITE-RODGERS  
WHITE-RODGERS  
Operator: Save this booklet for future use!  
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About Your New Thermostat . . .  
Your new White-Rodgers Digital Thermostat uses the technology of a solid-state microcomputer  
to provide precise time/temperature control. This thermostat offers you the flexibility to design  
heating and cooling programs that fit your needs.  
Please read this manual thoroughly before operating or programming your thermostat. If you have  
questions, write to us at the address shown on the back cover of this manual.  
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In This Guide . . .  
YOUR NEW THERMOSTAT'S  
PROGRAMMING YOUR  
FEATURES ............................................ 4  
OPERATING YOUR THERMOSTAT ......... 5  
PARTS OF THE THERMOSTAT  
The Back Of the Thermostat Body  
The Display  
THERMOSTAT .................................... 16  
PLANNING FOR YOUR NEEDS  
ENTERING YOUR PROGRAM  
Set Current Time and Day  
Enter Heating Program  
The Thermostat Buttons  
Enter Cooling Program  
OPERATING FEATURES  
CHECK YOUR PROGRAMMING  
QUESTIONS AND ANSWERS................. 26  
Operator: Save this  
booklet for future use!  
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YOUR NEW THERMOSTAT’S FEATURES  
• Separate5-day(weekday)and2-day(week-  
• Preprogrammed temperature control  
• Adjustable cycle times  
• Compressor short cycle protection  
• Programmable blower control  
end) setback programming  
• Simultaneous heat and cool program stor-  
age  
• Fourseparatetime/temperaturesettingsper  
24-hour period  
• Computed Energy Management Recovery  
(EMR)  
• Armchair programming capability  
• Backlit LCD displays continuous set point,  
time, and room temperature  
• Blower delay in the cooling cycle  
• Audio and visual prompting during opera-  
tion  
• Two hour temperature override  
• Manual program override (HOLD tempera-  
ture)  
• "Advance Program" key  
°F/°C convertibility  
• Temperature range 40° to 99°F  
• 1.5 volt "AA" Energizer® alkaline battery  
backup  
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OPERATING YOUR THERMOSTAT  
Before you begin programming your thermo- The subbase is attached to the wall, but you can  
stat, you should be familiar with its features and remove the thermostat body for easy program-  
with the display and the location and operation ming. To remove the thermostat body from the  
of the thermostat buttons. The information in subbase, grasp the thermostat body and gently  
this section will help you become familiar with pull it straight out from the subbase. To attach  
your new thermostat so that you can easily thethermostatbody, lineupthesixterminalpins  
program it.  
on the upper section of the thermostat back with  
the matching connector on the subbase. Insert  
Your thermostat consists of two parts: the  
thermostat body and the subbase.  
CAUTION  
!
SUBBASE  
Remove power from the system at the  
circuit breaker/fuse box before removing  
or attaching the thermostat body. Equip-  
mentdamageand/orpersonalinjurycould  
occur.  
THERMOSTAT  
BODY  
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these, then gently pivot the thermostat body for approximately a year. If power loss is long  
down to connect the three pin connectors on the enough for the program to be lost, the thermo-  
lower portion of the thermostat back. Gently stat will automatically return to the factory pro-  
push until the snap connectors engage. DO grammed temperatures (64°F heating and 82°F  
NOT FORCE OR PRY THE THERMOSTAT, as cooling) when power is restored. You must  
this may damage the unit.  
reprogram the thermostat if this happens.  
If the word BATTERY is flashing in the display  
window, the batteries are low and should be  
replaced with fresh "AA" Energizer® alkaline  
batteries.  
PARTS OF THE THERMOSTAT  
The Back of The Thermostat Body  
CAUTION  
!
Turn the thermostat body over. On the back are  
the 3 "AA" Energizer® alkaline batteries.  
Before removing thermostat from the  
wall to replace the batteries, remove  
24vAC power from the thermostat at the  
breaker/fuse box.  
The "AA" Energizer® alkaline batteries provide  
power to the thermostat when the 24vAC power  
is interrupted (for example, when you remove  
the thermostat from the wall for programming).  
Fresh batteries will maintain the stored program  
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Batteries  
Other than  
and  
, the buttons are  
6-pin Connector  
locatedbehindthethermostatdoor. Toopenthe  
door, pull the door out from the top, then swing  
it down on its hinges.  
On the following pages there are brief descrip-  
tions of the display and the thermostat buttons.  
3-pin Connector  
BACK OF THERMOSTAT BODY  
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6
The Display  
The word BATTERY flashes on the display  
when the "AA" alkaline batteries are weak  
and should be replaced. The word BAT-  
TERY is displayed continuously (non-flash-  
ing) when thermostat is running on battery  
power only.  
Continuouslydisplayssystemmode(HEAT,  
OFF,COOL,HOLD). Duringprogramming,  
theprogramperiodisdisplayed(MOR,DAY,  
EVE, or NHT).  
1
2
Alternately displays room temperature (F  
denotesdegreesFahrenheitand Cdenotes  
degrees Celsius) and time of day (A de-  
notes AM time and P denotes PM time).  
FAN ON is displayed when the blower is  
operating continuously. FAN AUTO is dis-  
playedduringautomaticfanoperation(when  
theblowercycleswiththeheatingorcooling  
system).  
3
4
Displays the setpoint temperature.  
5 DAY indicates that the displayed program  
is the weekday program. 2 DAY indicates  
that the displayed program is the weekend  
program.  
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5
DAY  
FAN AUTO  
TIME  
FWD  
SET  
VIEW  
HOLD  
TEMP  
SYSTEM  
HEAT-OFF-COOL  
CLOCK  
PRGM  
TIME  
SET  
DAY  
RUN  
ADV  
FAN  
ON - AUTO  
BACK  
PRGM  
PRGM  
1
2
3
3
2
DAY  
FAN AUTO  
5
DAY  
FAN ON  
BATTERY  
6
4
4
2
5
6
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12  
13  
The Thermostat Buttons  
Used to initiate or review thermostat pro-  
gramming.  
7
8
Sets the system mode (HEATing, OFF, or  
COOLing).  
Used to start program operation after pro-  
gramming. Also used to return thermostat  
to program operation after being in HOLD  
mode.  
Selects fan operation (see #6, above). This  
button is also used to program the fan to run  
continuously during a program period.  
14  
15  
Used to manually override programming to  
holdataselectedtemperature(whenHOLD  
is displayed).  
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Runs display forward or backward through  
time, day, or anticipation settings during  
programming.  
Used to advance thermostat program to the  
next program period (for example, from the  
MOR program to the DAY program).  
TIME  
FWD  
TIME  
10  
11  
Used with  
time.  
and  
to set current  
BACK  
16 (Red arrow) Raises temperature setting  
(99°F or 37°C maximum).  
TIME  
FWD  
TIME  
Usedwith  
and  
tosetthecurrent  
BACK  
17  
(Blue arrow) Lowers temperature setting  
(40°F or 4°C minimum).  
day of the week. Also used in conjunction  
SET  
with  
toenteranticipationsettingmode.  
CLOCK  
18 Theredindicatorlightglowswheneverheat-  
ing, cooling, or fan are in operation.  
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17 16  
18  
5
DAY  
FAN AUTO  
TIME  
FWD  
SET  
VIEW  
HOLD  
TEMP  
SYSTEM  
HEAT-OFF-COOL  
7
8
CLOCK  
PRGM  
TIME  
SET  
DAY  
RUN  
ADV  
FAN  
ON - AUTO  
BACK  
PRGM  
PRGM  
10  
12  
14 15  
13  
11  
9
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temperature of 62°F, and that during the  
next program period, beginning at 6:00 AM,  
you have programmed a temperature of  
70°F. The thermostat will automatically  
activate the heating system at about 5:00  
AM, so that the programmed 70°F tempera-  
ture is reached by about 6:00 AM.  
OPERATING FEATURES  
Now that you are familiar with the thermostat  
display and buttons, read the following informa-  
tion to learn about the many features of the  
thermostat.  
The thermostat is configured at the factory  
so that this feature is disabled. If you wish  
to have this feature, refer to the installation  
instructions for this thermostat, or contact  
your local heating/cooling contractor.  
COMPUTED ENERGY MANAGEMENT  
RECOVERY (EMR) — At installation, the  
thermostat can be set to automatically cal-  
culate the time it will take to change the  
temperature to the next program setting.  
Then the thermostat will activate the heat-  
ing or cooling system to change the tem-  
perature so that the desired temperature is  
reached at the beginning of the next pro-  
gram period. As an example of this feature,  
assume that you have programmed your  
thermostat to provide an overnight heating  
TWO HOUR TEMPERATURE OVER-  
RIDE — Press  
or  
until the  
display shows the temperature you  
want. The thermostat will override cur-  
rent programming and keep the room  
temperature at the selected tempera-  
ture for two hours. After two hours, the  
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thermostat will automatically revert to  
the program.  
overridetheprogram,untilthenextprogram  
period begins (for example, pressing this  
key while in the DAY program will advance  
the thermostat to the EVE program, which  
will remain in effect until the NHT program  
begins).  
HOLD TEMPERATURE — The thermostat  
can hold any temperature within its range  
for an indefinite period, without reverting to  
HOLD  
the program. Press  
displayed. Then choose the desired hold  
temperature by pressing or  
. HOLD will be  
TEMP  
TIME  
°F/°C CONVERTIBILITY — Press  
FWD  
.
TIME  
and  
at the same time until the tem-  
BACK  
The thermostat will hold the room tempera-  
ture at the selected setting until you press  
RUN  
perature display is in °C (Celsius). To  
display °F, repeat the process.  
to start program operation again.  
PRGM  
ADJUSTABLE HEATING AND COOLING  
CYCLE TIMES (ANTICIPATION) — If the  
heating/cooling system is turning on and off  
too often (short cycles) or not often enough  
(long cycles), you may want to adjust the  
anticipation setting.  
Thisfeatureisidealforenergyconservation  
when the building is unoccupied for an ex-  
tended period of time.  
"ADVANCE PROGRAM" BUTTON —  
ADV  
Press  
tochangethethermostattothe  
PRGM  
next program period. This will temporarily  
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TIME  
FWD  
CAUTION  
!
cycles are too short, press  
to increase  
the cycle time. If the heat cycles are too long,  
A cooling anticipation setting of less  
than 10 may cause decreased compres-  
sor life.  
TIME  
press  
to decrease the cycle time. To  
BACK  
SET  
set cooling anticipation, press  
and  
CLOCK  
SET  
SET  
To adjust heat anticipation, press  
CLOCK  
atthesametimeagain. Thedisplaywill  
DAY  
SET  
showCOOL14(factorypreprogrammedcool-  
and  
atthesametime. Thedisplaywill  
DAY  
TIME  
FWD  
TIME  
show HEAT 5 (this is the factory prepro-  
grammedheatinganticipationsetting). You  
may select any anticipation setting from 2 to  
40 (note that for hydronic systems, a  
minimum anticipation setting of 15 is  
recommended). Whenever adjusting an-  
ticipation, increase or decrease the dis-  
played number by only one or two digits,  
then let the system run for a while to see if  
the adjustment is sufficient. If the heat  
ing anticipation). Use the  
and  
BACK  
RUN  
PRGM  
buttonstoadjustanticipation. Press  
return to your program.  
to  
LOW BATTERY INDICATOR — The word  
BATTERY will flash on the display if the  
"AA" alkaline batteries are low and should  
be replaced. The word BATTERY will be  
displayedcontinuously(non-flashing)when  
24v AC power is not being supplied to the  
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thermostat and the thermostat is operating  
on battery power only.  
COMPRESSORSHORTCYCLEPROTEC-  
TION — To protect your compressor from  
potential damage due to rapid cycling, this  
thermostat has a built-in delay of 5 minutes  
between cooling cycles. The following may  
cause a time delay in COOL:  
AUDIO PROMPTING — Each time you  
press a button, the thermostat will beep.  
BACKLIT DISPLAY — When you press  
any button on the thermostat, the display is  
lit for approximately eight seconds.  
SYSTEM INDICATOR LIGHT — The red  
lightontheupperrightpartofthethermostat  
indicatessystemoperation(seePARTSOF  
THE THERMOSTAT).  
a) Return of power after a power outage.  
SYSTEM  
HEAT-OFF-COOL  
b) Pressing  
to change operating  
modes.  
c) Pressing  
, creating a call for COOL  
too soon after a previous call.  
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PROGRAMMING YOUR THERMOSTAT  
Now you are ready to program your thermostat.  
This section will help you plan your thermostat's  
program to meet your needs.  
PLANNING FOR YOUR NEEDS  
First, answer the following questionsto help you  
decide what your needs are. If you are using the  
thermostatforacommercialapplication(astore,  
officebuilding,etc.),answerquestions1through  
4. If you are using the thermostat in your home,  
answer questions 5 through 8.  
For maximum comfort and efficiency, keep the  
following guidelines in mind when planning your  
program.  
• When heating (cooling) your building, pro-  
gramthetemperaturestobecooler(warmer)  
when the building is vacant or during peri-  
ods of low activity.  
FOR COMMERCIAL APPLICATIONS:  
1a. What time does the first person arrive at the  
building in the morning?  
• During early morning hours, the need for  
cooling is usually minimal.  
b. What temperature should the building be at  
this time? (heating? cooling?) These will be  
your MOR (morning) temperature settings.  
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2a. What time do the building occupants reach IN YOUR HOME:  
amaximumactivitylevel(usinglights,equip- 5a. What time does the first person get up in the  
ment, meeting rooms, etc.)?  
b. What temperature should the building be at  
this time? These will be your DAY tempera-  
ture settings.  
morning?  
b. What temperature should the house be at  
this time? These will be your MOR (morn-  
ing) temperature settings.  
3a. What time do the building occupants reach 6a. What time does the last person leave the  
a minimum activity level (limited personnel  
in building)?  
b. What temperature should the building be at  
thistime? ThesewillbeyourEVE (evening)  
temperature settings.  
4a. Whattimedoesthebuildingbecomevacant?  
b. What temperature should the building be at  
this time? These will be your NHT (night)  
temperature settings.  
house in the morning?  
b. What temperature should the house be at  
this time? These will be your DAY tempera-  
ture settings.  
7a. What time does the first person arrive home  
in the evening?  
b. What temperature should the house be at  
thistime? ThesewillbeyourEVE (evening)  
temperature settings.  
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8a. What time does the last person go to bed at If you want to change the preprogrammed times  
night?  
and temperatures, do the following.  
b. What temperature should the house be at  
this time? These will be your NHT (night)  
temperature settings.  
Determine the time periods and heating and  
cooling temperatures for your weekday pro-  
gram. You must program 4 periods for each day  
(MOR, DAY, EVE, and NHT). However, you  
mayusethesameheatingandcoolingtempera-  
tures for consecutive time periods. You can  
choose start times, heating temperatures, and  
cooling temperatures independently for both  
Now look at the factory preprogrammed times  
and temperatures shown below. If this program  
RUN  
will suit your needs, simply press  
to begin  
PRGM  
running the factory preset program.  
Cooling Program for ALL Days of the Week:  
Heating Program for ALL days of the Week:  
TEMP  
78  
82  
78  
78  
PERIOD  
MOR  
DAY  
EVE  
NHT  
TIME  
TEMP  
70  
70  
70  
64  
PERIOD  
MOR  
DAY  
EVE  
NHT  
TIME  
5:00 AM  
9:00 AM  
4:00 PM  
10:00 PM  
5:00 AM  
9:00 AM  
4:00 PM  
10:00 PM  
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weekday and weekend programs (for example,  
youmayselect5:00AMand70° astheweekday  
NOTE  
MOR heating start time and temperature, and We recommend that you remove the thermostat  
choose 7:00 AM and 76° as the weekday MOR from the wall for programming (especially for  
cooling start time and temperature). Use the entering cooling programming). Fresh "AA"  
following table to plan your program time peri- Energizer® alkaline batteries must be installed  
ods,andthetemperaturesyouwantduringeach to perform off-wall programming. BE SURE  
period. You may also want to look at the sample SYSTEM SWITCH IS SET TO OFF POSITION  
program table to get an idea of how the thermo- BEFORE REATTACHING THERMOSTAT TO  
stat can be programmed.  
SUBBASE!  
Set Current Time and Day  
ENTERING YOUR PROGRAM  
SET  
Follow these steps to enter the heating and  
cooling programs you have selected.  
1. Press  
once. The display will show  
CLOCK  
minutes only.  
EXAMPLE:  
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Heating/Cooling Schedule Plan  
WEEKEND (2 DAY)  
WEEKDAY (5 DAY)  
Start  
Time  
Start  
Time  
Temperature  
Temperature  
MOR HEAT  
DAY HEAT  
EVE HEAT  
NHT HEAT  
MOR COOL  
DAY COOL  
EVE COOL  
NHT COOL  
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SAMPLE  
Heating/Cooling Schedule Plan  
WEEKEND (2 DAY)  
WEEKDAY (5 DAY)  
Start  
Time  
Start  
Time  
Temperature  
68°F  
Temperature  
68°F  
MOR HEAT  
DAY HEAT  
EVE HEAT  
NHT HEAT  
MOR COOL  
DAY COOL  
EVE COOL  
NHT COOL  
5:30 AM  
7:00 AM  
11:00 AM  
6:00 PM  
11:30 PM  
7:00 AM  
12:30 PM  
6:00 PM  
11:30 PM  
8:00 AM  
5:00 PM  
10:30 PM  
6:30 AM  
2:00 PM  
5:00 PM  
10:30 PM  
65°F  
70°F  
65°F  
76°F  
78°F  
72°F  
78°F  
70°F  
70°F  
65°F  
76°F  
74°F  
72°F  
78°F  
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TIME  
FWD  
TIME  
RUN  
2. Press and hold either  
or  
until 7. Press  
once. Thedisplaywillshowthe  
BACK  
PRGM  
you reach the correct minutes.  
correct time and room temperature alter-  
nately.  
SET  
3. Press  
once. The display window will  
CLOCK  
show the hour only.  
EXAMPLE:  
Enter Heating Program  
During programming, if you don’t press any  
buttons for 5 minutes, the thermostat will enter  
the HOLD mode and will maintain a constant  
temperature. The display will revert to the  
alternating time/temperature display. To re-  
sume programming after this happens, press  
VIEW  
TIME  
FWD  
TIME  
4. Press and hold either  
or  
until  
BACK  
you reach the correct hour and AM/PM  
designation (AM begins at midnight; PM  
begins at noon).  
SET  
5. Press  
once. Thedisplaywillshowthe  
DAY  
untilyouareatthepointwhereyoustopped  
PRGM  
day of the week as an abbreviation (MO for  
Monday, TU for Tuesday, etc.).  
programming. Then you may continue to enter  
your programs normally. If you want to stop  
TIME  
FWD  
TIME  
6. Press and hold either  
or  
until  
RUN  
BACK  
programming at any time, simply press  
resume program operation.  
to  
PRGM  
you reach the current day of the week.  
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TIME  
FWD  
TIME  
SYSTEM  
HEAT-OFF-COOL  
1. Press  
2. Press  
until HEAT is displayed.  
program, press  
or  
until your  
BACK  
selectedtimeappears. Thetimewillchange  
in 15 minute increments.  
VIEW  
once. 5 DAY (indicating week-  
PRGM  
day program), and MOR, representing the  
morning heating period, will appear in the  
display. Also displayed are the currently  
programmed start time for the MOR period  
and the currently programmed tempera-  
ture.  
4. Press  
or  
until you reach your  
selected weekday MOR heating tempera-  
ture.  
5. If you want the fan to run continuously  
FAN  
during this period, press  
until PRG  
ON – AUTO  
FAN is displayed.  
EXAMPLE:  
5 DAY  
VIEW  
6. Press  
. The currently programmed  
This display window shows that for the  
weekday MOR period, the start time is 5:00  
AM, and 70° is the programmed tempera-  
ture (this example reflects factory prepro-  
gramming).  
PRGM  
starttimeandheatingtemperatureforweek-  
day DAY will be displayed.  
7. Repeat steps 3 through 5 to select the start  
time and heating temperature for the week-  
day DAY program.  
3. To change the displayed start time to your  
selected start time for weekday MOR heat  
8. Repeat steps 3 through 7 for the weekday  
EVE and NHT heating programs.  
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9. After entering your weekday heating pro-  
gram, repeat steps 1 through 8 for your  
weekend programming (keep in mind that  
for weekend programming, the display  
should be changed from 5 DAY to 2 DAY).  
10. When you have completed entering your  
RUN  
be installed to perform off-wall program-  
ming. Programming away from the wall  
should prevent accidental compressor  
operation. BE SURE SYSTEM SWITCH  
IS SET TO OFF POSITION BEFORE RE-  
ATTACHINGTHETHERMOSTATTOTHE  
SUBBASE!  
heating program, press  
.
PRGM  
SYSTEM  
HEAT-OFF-COOL  
1. Press  
until COOL appears.  
Enter Cooling Program  
2. Followtheprocedureforenteringyourheat-  
ing program, using your selected cooling  
times and temperatures.  
CAUTION  
!
If outside temperature is below 50°F, we  
recommend that you remove the ther-  
mostat from the wall before proceeding  
withthefollowingstepstoprogramcool-  
ing temperatures. Personal injury or  
property damage may occur due to air  
conditionercompressorslugging. Fresh  
"AA" Energizer® alkaline batteries must  
CHECK YOUR PROGRAMMING  
Follow these steps to check your thermostat  
programming one final time before beginning  
thermostat operation.  
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YOURTHERMOSTATISNOWCOMPLETELY  
PROGRAMMEDANDREADYTOAUTOMATI-  
CALLYPROVIDEMAXIMUMCOMFORTAND  
EFFICIENCY!  
SYSTEM  
HEAT-OFF-COOL  
1. Press  
until HEAT is displayed.  
VIEW  
2. Press and hold  
to view the heating  
PRGM  
period times and temperatures in sequence  
for weekday, then weekend MOR, DAY,  
EVE, and NHT program periods.  
SYSTEM  
Press  
until OFF is displayed. Reattach  
HEAT-OFF-COOL  
thermostat to subbase. Turn on power to the  
RUN  
3. Press  
4. Press  
.
PRGM  
SYSTEM  
HEAT-OFF-COOL  
system. Thenpress  
toselecttheopera-  
SYSTEM  
HEAT-OFF-COOL  
until COOL is displayed.  
tion mode you want (HEAT or COOL). Press  
5. Repeat step 2 to check cooling tempera-  
tures.  
FAN  
ON – AUTO  
until FAN AUTO is displayed (auto-  
matic cycling).  
RUN  
6. Press  
to begin program operation.  
PRGM  
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QUESTIONS AND ANSWERS  
1. How can I permanently change a part of  
change when the EVE period begins. See  
PROGRAMMING YOUR THERMOSTAT.  
my program?  
VIEW  
3. How can I finish my programming if the  
display has already changed to time/  
temperature?  
Press  
until you reach the time/tem-  
PRGM  
perature schedule you want. Then press  
TIME  
FWD  
TIME  
or  
and  
and  
to  
During programming, if no buttons are  
pressed for five minutes, the thermostat will  
enter the HOLD mode and maintain a con-  
stant temperature. The display will change  
to the time/temperature mode. To resume  
VIEW  
BACK  
change the program. See PROGRAM-  
MING YOUR THERMOSTAT.  
2. How can I have no change in tempera-  
ture from one time period to another?  
Simply select the same temperature for  
eachconsecutivetimeperiod. Forexample,  
you may select the same weekday EVE  
cooling temperature as you did for weekday  
DAY, which means the temperature will not  
programming, press  
until you return  
PRGM  
to the point where you stopped program-  
ming. Then you may continue to program  
the thermostat normally. If you want to stop  
RUN  
programming at this point, press  
to  
PRGM  
26  
start the normal program function. See 5. What can cause the thermostat display  
PROGRAMMING YOUR THERMOSTAT.  
to freeze or go blank?  
A completely blank display may indicate  
that power has been lost to the thermostat  
and the backup battery is also dead. How-  
ever, if there is power to the thermostat and  
the display is blank or frozen, static dis-  
charge is probably the cause.  
4. What happens if the electricity goes off  
or is manually shut off?  
If you have not installed 3 "AA" alkaline  
batteries, the display will go blank and the  
program will be lost in approximately one  
minute. When electricity is restored, the  
clock will reset itself to 12:00 PM (noon) and  
the thermostat will maintain a heating tem-  
perature of 64°F and a cooling temperature  
of 82°F until you reenter your program.  
Setpoint temperature will not be displayed.  
If fresh "AA" Energizer® alkaline batteries  
are installed, the program will be main-  
tained for about one year with no 24vAC  
power present to the thermostat. See OP-  
ERATING YOUR THERMOSTAT.  
During periods of low humidity (especially  
during cold weather), you may feel or see a  
spark discharge when you touch the ther-  
mostat. This may cause the program to be  
lost or the thermostat to display incorrectly.  
To correct this, remove the thermostat from  
the wall and disconnect the battery. Wait  
about one minute, then reconnect the bat-  
tery. Thethermostatwillreverttothefactory  
preset program until you reprogram the  
thermostat. If you don’t want to reprogram  
27  
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7. The display shows a continuous (non-  
flashing) BATTERY. What does this  
mean?  
SYSTEM  
HEAT-OFF-COOL  
the thermostat immediately, press  
until OFF is displayed and replace the ther-  
RUN  
The thermostat is not being supplied with  
24vAC power. The thermostat is operating  
on battery power alone. See OPERATING  
YOUR THERMOSTAT.  
mostat on the wall. Then press  
to  
PRGM  
begin the factory preset program. Or you  
may reprogram the thermostat, then re-  
place it on the wall.  
8. Why won’t the compressor turn on, even  
though the thermostat display is func-  
tioning normally?  
To prevent further static discharge prob-  
lems, touch another object to release static  
build-up before touching the thermostat.  
See OPERATING YOUR THERMOSTAT.  
Either the compressor lockout feature is in  
operation or the thermostat is not currently  
callingforcool. Waitabout5minutesforthe  
compressor lockout to expire. If the system  
isstillnotrunning,readthecautionarystate-  
ment at right. Then, if conditions permit,  
6. The display is flashing BATTERY. What  
does this mean?  
The "AA" batteries installed in the thermo-  
stat are low and should be replaced with  
fresh"AA"Energizer® alkalinebatteries. See  
OPERATING YOUR THERMOSTAT.  
use the  
button to move the tempera-  
ture below the setpoint temperature. See  
OPERATING YOUR THERMOSTAT.  
28  
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See OPERATING YOUR THERMO-  
STAT.  
CAUTION  
If the outside temperature is below 50°F,  
DONOTusethe buttontomovethe  
temperaturebelowthesetpointtempera-  
ture. Property damage may result due to  
compressor slugging.  
!
You have programmed the incorrect day  
or time. Check your programming (be  
sure that the times you programmed are  
correct AM or PM times). See PRO-  
GRAMMING YOUR THERMOSTAT.  
The thermostat is in the HOLD mode.  
RUN  
9. Why doesn’t the temperature change at  
the time I programmed?  
Press  
to start program operation.  
PRGM  
There may be a number of causes for this  
situation. The following are primary rea-  
sons.  
See OPERATING YOUR THERMO-  
STAT.  
The compressor lockout feature is oper-  
ating; wait about 5 minutes for system to  
beginrunning. SeeOPERATINGYOUR  
THERMOSTAT.  
The EMR function is operating. The  
EMR function will automatically bring on  
the system automatically to bring the  
temperature to the selected level by the  
beginning of the next program period.  
10. Why does the blower fan keep running  
after the system has turned off?  
You have programmed the fan to run  
29  
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continuously during this period. See 12. Between heating and cooling seasons, I  
PROGRAMMING YOUR THERMO-  
STAT.  
want to turn my system off. Can I do this  
without affecting my thermostat pro-  
gramming?  
The blower delay feature is operating.  
This energy saving feature continues to  
blow conditioned air through the ducts  
after the system has turned off, rather  
than letting the air dissipate.  
Any time you wish to turn your system off,  
SYSTEM  
HEAT-OFF-COOL  
simplypress  
untilthedisplayshows  
OFF. This will not affect your thermostat’s  
programming in any way. To turn the sys-  
SYSTEM  
11. Why is the system turning on and off so  
frequently (seldom)?  
tem back on, press  
until HEAT,  
HEAT-OFF-COOL  
The anticipation setting is too low (high). To  
change anticipation settings, see OPER-  
ATING YOUR THERMOSTAT.  
COOL, etc. is displayed. The system will  
automatically begin operating according to  
the current thermostat program, unless the  
thermostat is in the HOLD mode. See  
OPERATING YOUR THERMOSTAT.  
30  
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13. I live in an area where daylight savings  
time is observed. How do I change the  
thermostat clock twice a year without  
affecting thermostat programming?  
To change your clock, follow the instruc-  
tions for setting current time and day. See  
ENTERING YOUR PROGRAM. Thermo-  
stat programming is not affected when you  
change the clock.  
after seeing a flashing BATTERY on the  
display, theinstalledbatteriesmaybedead.  
If you remove the old batteries and install  
fresh ones within one minute, you should  
not lose your thermostat programming. Af-  
terinstallingnewbatteries, followtheproce-  
dures in CHECK YOUR PROGRAMMING  
to determine whether your programming  
was maintained. If the thermostat main-  
SYSTEM  
14. Do I have to reprogram my thermostat  
after I change the batteries?  
tainsprogramming,press  
untilOFF  
HEAT-OFF-COOL  
is displayed, put the thermostat back on the  
When the thermostat is on the wall and the  
system has power, the thermostat is being  
powered by a 24v AC source. If power is  
lost, or if the thermostat is removed from the  
wall, the program will be retained for ap-  
proximately one minute if there are no  
batteriesinstalledoriftheinstalledbatteries  
are dead. If you are changing the batteries  
SYSTEM  
HEAT-OFF-COOL  
wall, press  
to select the operating  
RUN  
mode you want, then press  
to start  
PRGM  
program operation. If the program is lost,  
reprogramthethermostat. SeePROGRAM-  
MING YOUR THERMOSTAT.  
31  
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If you need further information on programming or operation, write to us at:  
White-Rodgers Division, Emerson Electric Co.  
9797 Reavis Road  
St. Louis, MO 63123  
Attn: Technical Service Department  
Part No. 37-5090A  
9139  
R