White Rodgers 1F90 51 Thermostat User Manual

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OPERATION GUIDE  
1F90-51  
5 Day/2 Day Electronic  
Digital Thermostat  
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 .................................... 19  
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................. 29  
Operator: Save this  
booklet for future use!  
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YOUR NEW THERMOSTAT’S FEATURES  
• Separate5-day(weekday)and2-day(week-  
• Adjustable cycle times  
end) setback programming  
• Compressor short cycle protection  
• Programmable blower control  
• Blower delay in the cooling cycle  
• Audio and visual prompting during operation  
• Two hour temperature override  
• Simultaneousheatandcoolprogramstorage  
• Fourseparatetime/temperaturesettingsper  
24-hour period  
• Computed Energy Management Recovery  
(EMR)  
• Manual program override (HOLD tempera-  
ture)  
• Armchair programming capability  
• Backlit LCD displays continuous set point,  
time, and room temperature  
• 1.5 volt “AA” Energizer® alkaline battery  
• “Advance Program” key  
°F/°C convertibility  
• Temperature range 40° to 99°F  
backup  
• Preprogrammed temperature control  
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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 the thermostat body, line up the two terminal  
program it.  
pins on the lower section of the thermostat back  
with the matching connector on the subbase.  
Insert these, then gently pivot the thermostat  
body up to connect the six pin connectors on the  
upper portion of the thermostat back. Gently  
push until the snap connectors engage. DO  
NOT FORCE OR PRY THE THERMOSTAT, as  
this may damage the unit.  
Your thermostat consists of two parts: the ther-  
mostat body and the subbase.  
CAUTION  
!
Remove power from the system at the  
circuit breaker/fuse box before remov-  
ing or attaching the thermostat body.  
Equipment damage and/or personal in-  
jury could occur.  
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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  
Turn the thermostat body over. On the back are  
the 3 “AA” Energizer® alkaline batteries.  
CAUTION  
!
The “AA” Energizer® alkaline batteries provide  
powertothethermostatwhenthe24 VACpower  
is interrupted (for example, when you remove  
the thermostat from the wall for programming).  
Fresh batteries will maintain the stored program  
for approximately a year. If power loss is long  
enough for the program to be lost, the thermo-  
stat will automatically return to the factory pro-  
grammed temperatures (64°F heating and 82°F  
cooling) when power is restored. You must  
reprogram the thermostat if this happens.  
SYSTEM  
SWITCH  
Use  
to turn the thermostat OFF  
beforeremovingthethermostatfromthe  
wall to replace batteries.  
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Other than  
and  
, the buttons are  
Batteries  
6-pin connector  
locatedbehindthethermostatdoor. Toopenthe  
door, put your fingernail in the indentation at the  
topofthedoor,thenpullthedooroutfromthetop  
and swing it down on its hinges.  
On the following pages there are brief descrip-  
tions of the display and the thermostat buttons.  
2-pin connector  
BACK OF THERMOSTAT BODY  
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The Display  
The word BATTERY flashes on the display  
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6
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,  
1
2
OFF,COOL, HOLD).Duringprogramming,  
theprogramperiodisdisplayed(MOR,DAY,  
EVE, or NHT).  
Alternately displays room temperature (F  
FAN ON is displayed when the blower is  
denotesdegreesFahrenheitand Cdenotes  
degrees Celsius) and time of day (A de-  
notes AM time and P denotes PM time).  
operating continuously. FAN AUTO is dis-  
playedduringautomaticfanoperation(when  
theblowercycleswiththeheatingorcooling  
system).  
Displays the setpoint temperature.  
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4
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  
WHITE-RODGERS  
DIGITAL COMFORT SET II  
TIME  
FWD  
SET  
VIEW  
HOLD  
TEMP  
SYSTEM  
SWITCH  
CLOCK  
PRGM  
HEAT-OFF-COOL-AUTO  
FAN  
SWITCH  
TIME  
SET  
DAY  
RUN  
ADV  
BACK  
PRGM  
PRGM  
ON-AUTO  
1
2
3
3
2 DAY  
FAN AUTO  
5 DAY  
FAN ON  
BATTERY  
4
6
4
6
2
5
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The Thermostat Buttons  
Used to initiate or review thermostat pro-  
gramming.  
12  
13  
Sets the system mode (HEATing, OFF, or  
COOLing).  
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8
Used to start program operation after pro-  
gramming.Alsousedtoreturnthermostatto  
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.  
Used to manually override programming to  
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15  
16  
Runs display forward or backward through  
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holdataselectedtemperature(whenHOLD  
is displayed).  
time, day, or anticipation settings during  
programming.  
TIME  
FWD  
TIME  
Used to advance thermostat program to the  
Used with  
Used with  
and  
and  
to set current time.  
10  
11  
BACK  
next program period (for example, from the  
MOR program to the DAY program).  
TIME  
FWD  
TIME  
to set the day of the  
BACK  
SET  
(Red arrow)  
Raises temperature set-  
week. Also used in conjunction with  
enter anticipation setting mode.  
to  
CLOCK  
ting (99°F or 37°C maximum).  
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(Blue arrow)  
Lowers temperature set-  
Theredindicatorlightglowswheneverheat-  
ing, cooling, or fan are in operation.  
17  
18  
ting (40°F or 4°C minimum).  
17 16  
18  
5 DAY  
FAN AUTO  
WHITE-RODGERS  
DIGITAL COMFORT SET II  
TIME  
FWD  
SET  
VIEW  
HOLD  
TEMP  
SYSTEM  
SWITCH  
7
8
CLOCK  
PRGM  
HEAT-OFF-COOL-AUTO  
FAN  
SWITCH  
TIME  
SET  
DAY  
RUN  
ADV  
BACK  
PRGM  
PRGM  
ON-AUTO  
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10 11 12 13 14 15  
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next program period, beginning at 6:00 AM,  
you have programmed a temperature of  
70°F. The thermostat will automatically ac-  
tivate the heating system at about 5:00 AM,  
so that the programmed 70°F temperature  
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.  
COMPUTED ENERGY MANAGEMENT  
RECOVERY (EMR) — The thermostat’s  
microcomputer can be set to automatically  
calculate 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  
temperature of 62°F, and that during the  
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.  
TWO HOUR TEMPERATURE OVER-  
RIDE — Press  
or  
until the dis-  
play shows the temperature you want. The  
thermostat will override current program-  
ming and keep the room temperature at the  
selected temperature for two hours. After  
two hours, the thermostat will automatically  
revert to the program.  
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HOLD TEMPERATURE — The thermostat  
can hold any temperature within its range  
for an indefinite period, without reverting to  
HOLD  
key while in the DAY program will advance  
the thermostat to the EVE program, which  
will remain in effect until the NHT program  
begins).  
the program. Press  
. HOLD will be dis-  
TEMP  
TIME  
°F/°C CONVERTIBILITY — Press  
and  
played. Then choose the desired hold tem-  
perature by pressing or . The  
thermostat will hold the room temperature  
FWD  
TIME  
at the same time until the temperature  
BACK  
display is in °C (Celsius). To display °F,  
repeat the process.  
RUN  
at the selected setting until you press  
to  
PRGM  
start program operation again. This feature  
is ideal for energy conservation when the  
building is unoccupied for an extended pe-  
riod of time.  
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.  
“ADVANCE PROGRAM” KEY — Press  
ADV  
to change the thermostat to the next  
PRGM  
program period. This will temporarily over-  
ride the program, until the next program  
period begins (for example, pressing this  
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TIME  
CAUTION  
heat cycles are too long, press  
to de-  
!
BACK  
Acoolinganticipationsettingoflessthan  
10maycausedecreasedcompressorlife.  
creasethecycletime. Toset coolingantici-  
SET  
SET  
DAY  
pation, press  
and  
at the same time  
CLOCK  
SET  
again. The display will show COOL 14 (fac-  
tory preprogrammed cooling anticipation).  
Youmayselectanyanticipationsettingfrom  
To adjust heat anticipation, press  
and  
CLOCK  
SET  
at the same time. The display will show  
DAY  
TIME  
FWD  
TIME  
HEAT 5 (this is the factory preprogrammed  
heating anticipation setting). You may se-  
lect any anticipation setting from 2 to 40  
(note that for hydronic systems, a mini-  
mum anticipation setting of 15 is recom-  
mended).Wheneveradjustinganticipation,  
increase or decrease the displayed 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 cycles are too short,  
TIME  
4 to 40. Use  
tion. Press  
and  
to adjust anticipa-  
BACK  
RUN  
PRGM  
to return to your program.  
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  
24 VAC power is not being supplied to the  
thermostat and the thermostat is operating  
on battery power only.  
press  
to increase the cycle time. If the  
FWD  
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AUDIO PROMPTING — Each time you  
press a button, the thermostat will beep.  
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:  
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  
SWITCH  
b) Pressing  
modes.  
to change operating  
c) Pressing  
, creating a call for COOL  
too soon after a previous call.  
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PROGRAMMINGYOURTHERMOSTAT  
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 questions to 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.  
2a. What time do the building occupants reach  
amaximumactivitylevel(usinglights,equip-  
ment, meeting rooms, etc.)?  
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b. What temperature should the building be at  
this time? These will be your DAY tempera-  
ture settings.  
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)?  
house in the morning?  
b. What temperature should the house be at  
this time? These will be your DAY tempera-  
ture settings.  
b. What temperature should the building be at  
thistime? ThesewillbeyourEVE (evening)  
temperature settings.  
7a. What time does the first person arrive home  
in the evening?  
4a. What time does the building become va-  
cant?  
b. What temperature should the house be at  
thistime? ThesewillbeyourEVE (evening)  
temperature settings.  
b. What temperature should the building be at  
this time? These will be your NHT (night)  
temperature settings.  
8a. What time does the last person go to bed at  
night?  
IN YOUR HOME:  
b. What temperature should the house be at  
this time? These will be your NHT (night)  
temperature settings.  
5a. What time does the first person get up in the  
morning?  
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Now look at the factory preprogrammed times choose start times, heating temperatures, and  
and temperatures shown below. If this program cooling temperatures independently for both  
weekday and weekend programs (for example,  
RUN  
will suit your needs, simply press  
to begin  
PRGM  
youmayselect5:00AMand70° astheweekday  
MOR heating start time and temperature, and  
choose 7:00 AM and 76° as the weekday MOR  
cooling start time and temperature).  
running the factory preset program.  
If you want to change the preprogrammed times  
and temperatures, do the following.  
Use the following table to plan your program  
time periods, and the temperatures you want  
duringeachperiod. Youmayalsowanttolookat  
the sample program table to get an idea of how  
the thermostat can be programmed.  
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  
FACTORY PREPROGRAMMING  
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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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  
Temperature  
MOR HEAT  
DAY HEAT  
EVE HEAT  
NHT HEAT  
MOR COOL  
DAY COOL  
EVE COOL  
NHT COOL  
5:30 AM  
68°F  
7:00 AM  
11:00 AM  
6:00 PM  
11:30 PM  
7:00 AM  
12:30 PM  
6:00 PM  
11:30 PM  
68°F  
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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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 min-  
CLOCK  
utes only.  
NOTE  
EXAMPLE:  
We recommend that you remove the thermostat  
from the wall for programming (especially for  
entering cooling programming). Fresh “AA” En-  
ergizer® alkaline batteries must be installed to  
perform off-wall programming. BE SURE TO  
SYSTEM  
TIME  
FWD  
TIME  
2. Press and hold either  
or  
until you  
BACK  
reach the correct minutes.  
SET  
3. Press  
once. The display window will  
CLOCK  
show the hour only.  
EXAMPLE:  
USE  
TO TURN THERMOSTAT OFF  
SWITCH  
BEFORE REATTACHING THERMOSTAT TO  
SUBBASE!  
TIME  
FWD  
TIME  
4. Press and hold either  
or  
until you  
BACK  
reachthecorrecthourandAM/PMdesigna-  
tion (AM begins at midnight; PM begins at  
noon).  
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youareatthepointwhereyoustoppedprogram-  
ming. Then you may continue to enter your  
programs normally. If you want to stop program-  
RUN  
SET  
DAY  
5. Press  
once. The display will show the  
day of the week as an abbreviation (MO for  
Monday, TU for Tuesday, etc.).  
ming at any time, simply press  
to resume  
PRGM  
TIME  
FWD  
TIME  
6. Press and hold either  
or  
until you  
BACK  
program operation.  
reach the current day of the week.  
SYSTEM  
SWITCH  
1. Press  
2. Press  
until HEAT is displayed.  
RUN  
7. Press  
once. The display will show the  
PRGM  
VIEW  
once.5DAY(indicatingweekday  
PRGM  
correct time and room temperature alter-  
nately.  
program),andMOR,representingthemorn-  
ing heating period, will appear in the dis-  
play. Also displayed are the currently pro-  
grammed start time for the MOR period and  
the currently programmed temperature.  
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 alter-  
natingtime/temperaturedisplay.Toresumepro-  
VIEW  
EXAMPLE:  
5 DAY  
This display window shows that for the  
weekday MOR period, the start time is 5:00  
gramming after this happens, press  
until  
PRGM  
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AM, and 70° is the programmed tempera- 7. Repeat steps 3 through 5 to select the start  
ture (this example reflects factory prepro-  
gramming).  
time and heating temperature for the week-  
day DAY program.  
3. To change the displayed start time to your 8. Repeat steps 3 through 7 for the weekday  
selected start time for weekday MOR heat  
EVE and NHT heating programs.  
TIME  
FWD  
TIME  
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).  
program, press  
or  
until your se-  
BACK  
lected time appears. The time will change in  
15 minute increments.  
4. Press  
or  
until you reach your  
selectedweekdayMORheatingtemperature.  
10. When you have completed entering your  
5. If you want the fan to run continuously  
RUN  
heating program, press  
.
PRGM  
FAN  
during this period, press  
FAN is displayed.  
VIEW  
until PRG  
SWITCH  
6. Press PRGM . The currently programmed start  
time and heating temperature for weekday  
DAY will be displayed.  
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Enter Cooling Program  
SYSTEM  
SWITCH  
1. Press  
until COOL appears.  
CAUTION  
!
2. Followtheprocedureforenteringyourheat-  
ing program, using your selected cooling  
times and temperatures.  
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  
be installed to perform off-wall program-  
ming. Programming away from the wall  
should prevent accidental compressor  
SYSTEM  
CHECK YOUR PROGRAMMING  
Follow these steps to check your thermostat  
programming one final time before beginning  
thermostat operation.  
SYSTEM  
SWITCH  
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.  
operation. USE  
TO TURN THER-  
SWITCH  
MOSTAT OFF BEFORE REATTACHING  
THE THERMOSTAT TO THE SUBBASE!  
RUN  
3. Press  
.
PRGM  
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SYSTEM  
SWITCH  
SYSTEM  
SWITCH  
4. Press  
until COOL is displayed.  
Press  
until OFF is displayed. Reattach  
thermostat to subbase. Turn on power to the  
5. Repeat step 2 to check cooling tempera-  
tures.  
SYSTEM  
system. Thenpress  
toselecttheopera-  
SWITCH  
RUN  
tion mode you want (HEAT or COOL). Press  
6. Press  
to begin program operation.  
PRGM  
FAN  
SWITCH  
until FAN AUTO is displayed (auto-  
YOURTHERMOSTATISNOWCOMPLETELY  
PROGRAMMEDANDREADYTOAUTOMATI-  
CALLYPROVIDEMAXIMUMCOMFORTAND  
EFFICIENCY!  
matic cycling).  
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QUESTIONS AND ANSWERS  
1. How can I permanently change a part of  
DAY, which means the temperature will not  
change when the EVE period begins. See  
PROGRAMMING YOUR THERMOSTAT.  
my program?  
VIEW  
Press  
untilyoureachthetime/tempera-  
PRGM  
3. How can I finish my programming if the  
display has already changed to time/  
temperature?  
TIME  
FWD  
ture schedule you want. Then press  
or  
TIME  
and  
and  
to change the  
BACK  
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  
program. See PROGRAMMING YOUR  
THERMOSTAT.  
2. How can I have no change in tempera-  
ture from one time period to another?  
programming, press  
until you return to  
PRGM  
Simply select the same temperature for  
eachconsecutivetimeperiod. Forexample,  
you may select the same weekday EVE  
cooling temperature as you did for weekday  
the point where you stopped programming.  
Then you may continue to program the  
thermostat normally. If you want to stop  
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power present to the thermostat. See OP-  
ERATING YOUR THERMOSTAT.  
RUN  
programmingatthispoint, press  
tostart  
PRGM  
the normal program function. See PRO-  
GRAMMING YOUR THERMOSTAT.  
5. What can cause the thermostat display  
to freeze or go blank?  
4. What happens if the electricity goes off  
or is manually shut off?  
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.  
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.  
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-  
If fresh “AA” Energizer® alkaline batteries  
are installed, the program will be main-  
tained for about one year with no 24 VAC  
27  
href="
tery. Thethermostatwillreverttothefactory  
preset program until you reprogram the  
thermostat. If you don’t want to reprogram  
SYSTEM  
freshAAEnergizer® alkalinebatteries.See  
OPERATING YOUR THERMOSTAT.  
7. The display shows a continuous (non-  
flashing) BATTERY. What does this  
mean?  
the thermostat immediately, press  
SWITCH  
until OFF is displayed and replace the ther-  
The thermostat is not being supplied with  
24 VAC power. The thermostat is operating  
on battery power alone. See OPERATING  
YOUR THERMOSTAT.  
RUN  
mostat on the wall. Then press  
to begin  
PRGM  
the factory preset program. Or you may  
reprogramthethermostat,thenreplaceiton  
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  
calling for cool. Wait about 5 minutes for the  
compressor lockout to expire. If the system  
isstillnotrunning,readthecautionarystate-  
ment below. 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  
28  
href="
use the  
button to move the tempera-  
programperiod.SeeOPERATINGYOUR  
THERMOSTAT.  
ture below the setpoint temperature. See  
OPERATING YOUR THERMOSTAT.  
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.  
CAUTION  
!
If the outside temperature is below 50°F,  
DO NOT use the button to move the  
temperaturebelowthesetpointtempera-  
ture. Property damage may result due to  
compressor slugging.  
The thermostat is in the HOLD mode.  
RUN  
Press  
tostartprogramoperation.See  
PRGM  
OPERATING YOUR THERMOSTAT.  
9. Why doesn’t the temperature change at  
the time I programmed?  
The compressor lockout feature is oper-  
ating; wait about 5 minutes for system to  
begin running. See OPERATING YOUR  
THERMOSTAT.  
There may be a number of causes for this  
situation. The following are primary reasons.  
The EMR function is operating. The EMR  
functionwillbringonthesystemautomati-  
cally to bring the temperature to the se-  
lected level by the beginning of the next  
29  
href="
10. Why does the blower fan keep running 12. Between heating and cooling seasons, I  
after the system has turned off?  
want to turn my system off. Can I do this  
withoutaffectingmythermostatprogram-  
ming?  
You have programmed the fan to run  
continuouslyduringthisperiod.SeePRO-  
GRAMMING YOUR THERMOSTAT.  
Any time you wish to turn your system off,  
SYSTEM  
SWITCH  
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.  
simplypress  
untilthedisplayshows  
OFF. This will not affect your thermostat’s  
programming in any way. To turn the sys-  
SYSTEM  
tem back on, press  
until HEAT,  
SWITCH  
11. Why is the system turning on and off so  
frequently (seldom)?  
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 OP-  
ERATING YOUR THERMOSTAT.  
The anticipation setting is too low (high). To  
change anticipation settings, see OPER-  
ATING YOUR THERMOSTAT.  
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?  
30  
href="
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.  
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  
wasmaintained. Ifthethermostatmaintains  
SYSTEM  
14. Do I have to reprogram my thermostat  
after I change the batteries?  
When the thermostat is on the wall and the  
system has power, the thermostat is being  
powered by a 24 VAC 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  
after seeing a flashing BATTERY on the  
display, theinstalledbatteriesmaybedead.  
programming, press  
until OFF is  
SWITCH  
displayed, put the thermostat back on the  
SYSTEM  
SWITCH  
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  
href="
If you need further information on programming or operation, write to:  
White-Rodgers Division, Emerson Electric Co.  
9797 Reavis Road  
St. Louis, MO 63123-5398  
Attn: Technical Service Department  
Part No. 37-5099B  
Replaces 37-5099A  
9532  
R

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