OPERATION GUIDE
1F91-71
Multi-stage Electronic Digital
Thermostat
WHITE-RODGERS
Operator: Save this booklet for future use!
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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 ................................... 17
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 ............... 28
Operator: Save this
booklet for future use!
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3
YOUR NEW THERMOSTAT’S FEATURES
• Computed Energy Management Recovery
• Manual program override (HOLD tempera-
(EMR)
ture)
• Automaticchangeover(operatorselectable)
• Five-day/two-day programming capability
• “Advance Program” button
• Backlit LCD displays continuous setpoint,
time, and room temperature
• Simultaneous heat and cool program stor-
age
• Adjustable cycle times
• Preprogrammed temperature control
• 9 volt Energizer® alkaline battery backup
• Compressor short cycle protection
• Blower delay in the cooling cycle
• Four separate time and temperature set-
tings per 24-hour period
• Armchair programming capability
• Up to three stages of heat and up to two
stages of cool
• Audio and visual prompting during pro-
gramming
• Temperature range 40° to 99°F
• °F/°C convertibility
• Programmable blower control
• Two hour temperature override
• Compatible with Remote Sensor (optional)
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4
OPERATINGYOURTHERMOSTAT
Before you begin programming your new ther- Thesubbaseisattachedtothewall, butyoucan
mostat, you should be familiar with its fea- remove the thermostat body for easy program-
tures and with the display and the location and ming. To remove the thermostat body from the
operation of the thermostat buttons. The in- subbase, grasp the thermostat body and gently
formation in this section will help you become pull it out from the bottom of the subbase, then
familiar with your thermostat so that you can pivot up. To attach the thermostat body, line up
easily program it.
thefourterminalpinsontheuppersectionofthe
thermostat back with the matching connector
on the subbase. Insert these, then gently pivot
the thermostat body down to connect the nine
pin connectors on the lower portion of the ther-
mostat back. Gently push until the snap con-
nectors 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
!
SYSTEM
SWITCH
Use
to turn thermostat OFF be-
fore removing or attaching the thermo-
stat body. Equipment damage and/or
personal injury could occur.
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If the word BAT is flashing in the display
window, the battery is low and should be
replaced with a fresh 9 volt Energizer®
alkaline battery. The battery will provide
power for all functions except the display
PARTS OF THE THERMOSTAT
The Back of the Thermostat Body
Turn the thermostat body over. On the back are
the 9 volt Energizer® alkaline battery and the
option switches.
4-pin connector
Battery
1. The 9 volt Energizer® alkaline battery pro-
vides power to the thermostat when the
24 VAC power is interrupted (for example,
when you remove the thermostat from the
wall for programming). A fresh battery will
maintain the stored program for approxi-
mately one week. If power loss is long
enough for the program to be lost, the
thermostatwillautomaticallymaintainafac-
tory preprogrammed heating temperature
of 64°F and a cooling temperature of 82°F
after power is restored. You must repro-
Option switches
9-pin connector
BACK OF THERMOSTAT BODY
gram the thermoDstoawtnliofatdhfirsomhaWpwpwe.Snosm.anuals.com. All Manuals Search And Download.
6
light and audio prompting, which work only 2. You may adjust option switch #4 for auto-
on 24 VAC power. If the word BAT is dis-
playedcontinuously(non-flashing),thether-
mostat is not being supplied with 24 VAC
power and is being powered by the battery
alone.
matic changeover from heating to cooling
(see OPERATING FEATURES).
CAUTION
!
SYSTEM
SWITCH
Use
to turn thermostat OFF be-
fore removing thermostat from the wall
to replace the battery.
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7
Other than
and
, the buttons are
Displays the setpoint temperature.
3
4
located behind the thermostat door. To open
the door, use your fingernail in the indentation
at the top center of the door. Pull the door out,
then swing the door down on its hinges.
5DAYindicatesthatthedisplayedprogram
is the weekday program. 2 DAY indicates
that the displayed program is the weekend
program.
Following are brief descriptions of the display
and the thermostat buttons.
The word BAT flashes on the display when
5
6
the 9 volt alkaline battery is weak and
should be replaced.
The Display
FAN
operating continuously, regardless of heat-
ing or cooling system cycling. FAN is
is displayed when the blower is
Continuouslydisplayssystemmode(HEAT,
1
2
OFF, COOL, AUTO, HOLD). During pro-
gramming, the program period is displayed
(MOR, DAY, EVE, NHT).
displayed during automatic fan operation
(when the blower cycles with the heating or
cooling system).
Alternately displays room temperature (F
denotes degrees Fahrenheit and C de-
notes degrees Celsius) and time of day (A
denotes AM time and P denotes PM time).
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8
5
DAY
FAN
W H I T E - R O D G E R S
DIGITAL MULTI-STAGE COMFORT-SET II
TIME
FWD
SET
CLOCK
VIEW
PRGM
HOLD
TEMP
SYSTEM
SWITCH
HEAT/OFF/COOL/AUTO
FAN
SWITCH
TIME
BACK
SET
DAY
RUN
PRGM
ADV
PRGM
ON
/AUTO
1
2
3
3
2
DAY
FAN
5
DAY
BAT
FAN
6
4
4
5
2
6
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The Thermostat Buttons
Used to initiate or review thermostat pro-
gramming.
12
13
Sets the system mode (HEATing, OFF,
7
8
9
Used to start program operation after pro-
COOLing,orAUTOmaticchangeover[user
gramming. Also used to return thermostat
to program operation after being in HOLD
mode.
selectable feature]).
Selects fan operation (see #6, above). This
buttonisalsousedtoprogramthefantorun
continuously during a program period.
Used to manually override programming to
14
15
holdataselectedtemperature(whenHOLD
is displayed).
Runs display forward or backward through
time, day, or anticipation settings during
programming.
Usedtoadvancethermostatprogramtothe
next program period (for example, from the
MOR program to the DAY program).
TIME
FWD
TIME
Used with
and
to set current time
10
11
BACK
and day of the week.
(Blue arrow) Lowers temperature setting
(40°F or 4°C minimum).
(Red arrow) Raises temperature setting
(99°F or 37°C maximum)
16
17
Used during programming to set the day of
SET
the week. Also used with
anticipation setting mode.
to enter
CLOCK
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yellow light is on when the 2nd or 3rd stage
heating/cooling system is operating.
The red light is on when the 1st stage
heating/cooling system is operating. The
18
16 17
18
5
DAY
FAN
DIGITAL MULTI-STAGE COMFORT-SET
W H I T E - R O D G E R S
II
TIME
FWD
SET
CLOCK
VIEW
PRGM
HOLD
TEMP
SYSTEM
SWITCH
7
8
HEAT/OFF/COOL/AUTO
FAN
SWITCH
TIME
BACK
SET
DAY
RUN
PRGM
ADV
PRGM
ON
/AUTO
10
11 12
14 15
13
9
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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 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 mi-
crocomputer automatically calculates the
time it will take to change the temperature
to the next program setting. Then the ther-
mostat will activate the heating or cooling
system to change the temperature so that
the desired temperature is reached at the
beginningofthenextprogramperiod. Asan
example of this feature, assume that you
have programmed your thermostat to pro-
vide an overnight heating temperature of
62°F, and that during the next program
• AUTOMATIC CHANGEOVER — You can
set the thermostat to automatically switch
the system from heating to cooling as
needed. First, you must move option switch
#4 (located on the back of the thermostat
body)totheONposition,ifithasnotalready
been done. To do this, turn off 24 VAC
power to the thermostat. Then, remove the
thermostat body from the wall. Check the
position of switch #4 (the last switch on the
right). If it is ON (up), simply put the thermo-
stat back on the wall and restore 24 VAC
power. If the switch is OFF (down), use a
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pencil or small screwdriver to move the
switch to the ON position (see figure at
right). Leave the battery out of the thermo-
stat for at least two minutes, to allow the
thermostat to reset itself. DO NOT MOVE
ANY OTHER OPTION SWITCH, as it may
affect thermostat operation. Replace the
battery, putthethermostatbackonthewall,
and restore 24 VAC power. To set the ther-
mostat for automatic changeover after pro-
Automatic Changeover (ON)
ON
1
2
3
4
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 allow
the temperature separation between the high-
est heat setting and the lowest cool setting to be
less than 1°F. For example, if the highest heat
setting is 76°F, the lowest cool setting cannot
be below 77°F (see diagram below).
SYSTEM
SWITCH
gramming, press
to set the ther-
mostat to AUTO (the setpoint display is
blank in the AUTO mode). The system will
now automatically switch between heating
and cooling depending on the actual room
temperature.
79
78
COOLING TEMPERATURES
77
76
DEAD BAND 1°F
75
HEATING TEMPERATURES
74
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• TWO HOUR TEMPERATURE OVER-
RIDE — Press or until the
feature is ideal for energy conservation
when the building is unoccupied for an
extended period of time.
display shows the temperature you want.
The thermostat will override current pro-
gramming and keep the room temperature
at the selected temperature for two hours.
After two hours, the thermostat will auto-
matically revert to the program.
• “ADVANCE PROGRAM” BUTTON —
ADV
Press
to advance the thermostat pro-
PRGM
gram to the next period (such as from the
MOR program period to the DAY program
period). This change remains in effect until
the next program period begins.
• HOLD TEMPERATURE — The thermostat
can hold any temperature within its range
for an indefinite period, without reverting to
TIME
• °F/°CCONVERTIBILITY—Press
and
FWD
HOLD
the program. Press
displayed. Then choose the desired hold
temperature by pressing or
. HOLD will be
TEMP
TIME
at the same time until the temperature
BACK
display is in °C (Celsius). To display °F,
.
repeat the process.
The thermostat will hold the room tempera-
ture at the selected setting until you press
• ADJUSTABLE HEATING AND COOLING
CYCLE TIMES (ANTICIPATION) — If the
heating/coolingsystemisturningonandoff
RUN
to start program operation again. This
PRGM
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14
too often (short cycles) or not often enough
(long cycles), you may want to adjust the
anticipation setting.
TIME
FWD
If the heat cycles are too short, press
to increase the cycle time. If the heat cycles
TIME
are too long, press
to decrease the
BACK
CAUTION
!
cycletime.Tosetcoolinganticipation,press
A cooling anticipation setting of less
than 10 may cause decreased com-
pressor life.
SET
SET
DAY
and
at the same time again. The
CLOCK
display will show COOL 14 (factory prepro-
TIME
SET
SET
DAY
grammedcoolinganticipation).Usethe
To adjust anticipation, press
and
FWD
CLOCK
at the same time. The display will show
HEAT 8 (this is the factory preprogrammed
heating anticipation setting). You may se-
lect any anticipation setting from 4 to 40.
Whenever adjusting anticipation, 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.
TIME
and
buttonstoadjustanticipation.Press
BACK
RUN
to return to your program.
PRGM
• LOW BATTERY INDICATOR — The word
BAT will flash on the display if the 9 volt
alkaline battery is low and should be re-
placed.
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• AUDIO PROMPTING — Each time you
press a button, the thermostat will beep.
SYSTEM
SWITCH
b) Pressing
modes.
to change operating
• BACKLIT DISPLAY — When you press
any button on the thermostat, the display is
lit for approximately eight seconds (this
feature works only when the thermostat is
attached to the wall and 24 VAC power is
present to the thermostat).
c) Pressing
or to create a call
for COOL too soon after a previous call.
• SYSTEM INDICATOR LIGHTS — The red
indicator light comes on whenever the first
stage heating or cooling system is operat-
ing. The yellow indicator light comes on
when the second or third stages of heating
or cooling are operating.
• COMPRESSOR SHORT CYCLE PRO-
TECTION — To protect your compressor
from potential damage due to rapid cycling,
this thermostat has a built-in delay of 5
minutesbetweencoolingcycles.Theblower
will operate during a time delay, but the air
circulated will not be cooled. The following
may cause a time delay in COOL:
• PROGRAMMABLE BLOWER CON-
TROL — You may program the fan blower
to run continuously during any given pro-
gramperiod,regardlessofthecyclingofthe
heatingorcoolingsystem. Duringprogram-
ming, after entering the time and tempera-
a) Return of power after a power outage.
FAN
SWITCH
ture for the time period, press
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until
16
FAN is displayed. To override constant
FAN
SWITCH
fan, press
played.
until FAN
is dis-
PROGRAMMINGYOURTHERMOSTAT
Now you are ready to program your thermostat.
Thissectionwillhelpyouplanandprogramyour
thermostat to meet your needs.
PLANNING FOR YOUR NEEDS
This thermostat will store separate heating and
cooling programs for five-day (weekday) and
two-day (weekend) operation. Usually, the five-
day program is set to run Monday through
Friday, and the two-day program is set to run
Saturday and Sunday. However, you may
choose any five consecutive days to be your
weekdayprogramdays(suchasSundaythrough
Thursday; in this case, your weekend program
would run on Friday and Saturday).
For maximum comfort and efficiency, keep the
followingguidelinesinmindwhenplanningyour
program.
• When heating (cooling) your building, pro-
gramthetemperaturestobecooler(warmer)
when the building is vacant or during peri-
ods of low activity.
• During early morning hours, the need for
cooling is usually minimal.
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First, you should answer the following ques-
tions to help you decide what your needs are. If
you are using the thermostat for a commercial
application (a store, office building, etc.), an-
swer questions 1 through 4. If you are using the
thermostat in your home, answer questions 5
through 8. Keep in mind that you should plan for
both weekday and weekend programs.
b. What temperature should the building be at
this time? These will be your DAY tempera-
ture settings.
3a. What time do the building occupants reach
a minimum activity level (limited personnel
in building)? These will be your EVE
(evening) temperature settings.
b. What temperature should the building be at
this time?
FOR COMMERCIAL APPLICATIONS:
4a. What time does the building become va-
cant?
1a. What time does the first person arrive at the
building in the morning?
b. What temperature should the building be at
this time? These will be your NHT (night)
temperature settings.
b. What temperature should the building be at
this time? (heating? cooling?) These will be
your MOR (morning) temperature settings.
IN YOUR HOME:
2a. What time do the building occupants reach
amaximumactivitylevel(usinglights,equip-
ment, meeting rooms, etc.)?
5a. Whattimedoesthefirstpersongetupinthe
morning?
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b. What temperature should the house be at Now look at the factory preprogrammed times
this time? These will be your MOR (morn- and temperatures shown at the top of the next
ing) temperature settings.
page. Ifthisprogramwillsuityourneeds, simply
RUN
6a. What time does the last person leave the
house in the morning?
press
to begin running the factory preset
PRGM
program.
b. What temperature should the house be at
this time? These will be your DAY tempera-
ture settings.
Ifyouwanttochangethepreprogrammedtimes
and temperatures, do the following.
7a. Whattimedoesthefirstpersonarrivehome
in the evening?
NOTE
To operate properly in the AUTO mode, there
must be a minimum 1°F separation between
the highest heat temperature and the lowest
cool temperature (see diagram below).
b. What temperature should the house be at
this time? These will be yourEVE (evening)
temperature settings.
8a. What time does the last person go to bed at
night?
79
78
COOLING TEMPERATURES
b. What temperature should the house be at
this time? These will be your NHT (night)
temperature settings.
77
76
DEAD BAND 1°F
75
HEATING TEMPERATURES
74
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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
Determine the time periods and heating and weekday MOR heating start time and tempera-
cooling temperatures for your weekday pro- ture, and choose 7:00 AM and 76° as the
gram. You must program 4 periods for each day weekday MOR cooling start time and tempera-
(MOR, DAY, EVE, and NHT). However, you ture). Use the following table to plan your pro-
may use the same heating and cooling tem- gram time periods, and the temperatures you
peratures for consecutive time periods. You want during each period. You may also want to
can choose start times, heating temperatures, look at the sample program table to get an idea
and cooling temperatures independently for of how the thermostat can be programmed.
both weekday and weekend programs (for ex-
ample, you may select 5:00 AM and 70° as the
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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°
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°
8:00 AM
4:30 PM
11:00 PM
8:00 AM
12:00 PM
4:30 PM
11:00 PM
66°
70°
66°
76°
78°
74°
78°
70°
70°
66°
76°
74°
74°
78°
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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
CLOCK
minutes only.
NOTE
EXAMPLE:
We recommend that you remove the thermo-
stat from the wall for programming (especially
for entering cooling programming). A fresh 9
volt Energizer® alkaline battery must be in-
stalled to perform off-wall programming. BE
SURE SYSTEM SWITCH IS SET TO OFF
POSITION BEFORE REATTACHING THER-
MOSTAT TO SUBBASE!
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:
TIME
FWD
TIME
4. Press and hold either
or
until you
BACK
NOTE
reach the correct hour and AM/PM desig-
nation (AM begins at midnight; PM begins
at noon).
You cannot program the thermostat with the
SYSTEM SWITCH in the AUTO position.
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23
SET
DAY
VIEW
5. Press
once. The display will show the
programming after this happens, press
PRGM
day of the week as an abbreviation (MO for
Monday, TU for Tuesday, etc.).
until you are at the point where you stopped
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 you
BACK
RUN
programming at any time, simply press
resume program operation.
to
PRGM
reach the current day of the week.
RUN
7. Press
once. The display will show the
PRGM
SYSTEM
SWITCH
1. Press
until HEAT is displayed.
correct time and room temperature alter-
nately.
VIEW
2. Press
once. 5 DAY (indicating week-
PRGM
Enter Heating Program
day program), and MOR, representing
the morning heating period, will appear
in the display. Also displayed are the
currently programmed start time for the
MORperiodandthecurrentlyprogrammed
temperature.
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-
nating time/temperature display. To resume
EXAMPLE:
5 DAY
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24
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).
VIEW
6. Press
.Thecurrentlyprogrammedstart
PRGM
time and heating temperature for weekday
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
TIME
FWD
TIME
program, press
or
until your se-
BACK
EVE and NHT heating programs.
lectedtimeappears.Thetimewillchangein
15 minute increments.
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).
4. Press
or
until you reach your
selected weekday MOR heating tem-
perature.
10. When you have completed entering your
5. If you want the fan to run continuously
RUN
FAN
SWITCH
heating program, press
.
during this period, press
until
PRGM
FAN is displayed.
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25
Enter Cooling Program
SYSTEM
SWITCH
1. Press
until COOL appears.
CAUTION
!
2. Enter your cooling program by following
the procedure for entering your heating
program.
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
conditioner compressor slugging. A
fresh 9 volt Energizer® alkaline battery
must be installed to perform off-wall
programming. Programming away from
the wall should prevent accidental com-
pressor operation. BE SURE SYSTEM
SWITCH IS SET TO OFF POSITION BE-
FORE REATTACHING THE THERMO-
STAT TO THE SUBBASE!
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 se-
quence for weekday MOR, DAY, EVE,
and NHT, then for weekend MOR, DAY,
EVE, and NHT.
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26
RUN
SYSTEM
SWITCH
3. Press
4. Press
.
Press
until OFF is displayed. Reattach
PRGM
SYSTEM
SYSTEM
SWITCH
thermostat to subbase. Then press
to
SWITCH
until COOL is displayed.
select the operation mode you want (HEAT,
5. Repeat step 2 to check cooling tempera-
tures.
FAN
COOL, AUTO). Press
until FAN is
SWITCH
RUN
displayed (automatic cycling).
6. Press
to begin program operation.
PRGM
YOURTHERMOSTATISNOWCOMPLETELY
PROGRAMMEDANDREADYTOAUTOMATI-
CALLYPROVIDEMAXIMUMCOMFORTAND
EFFICIENCY!
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27
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
until you reach the time/tem-
PRGM
3. How can I finish my programming if the
display has already changed to time/
temperature?
perature schedule you want. Then press
TIME
FWD
TIME
or
and
and
to change
BACK
During programming, if no buttons are
pressedforfiveminutes, thethermostatwill
enter the HOLD mode and maintain a con-
stant temperature. The display will change
to the time/temperature mode. To resume
the program. See PROGRAMMING YOUR
THERMOSTAT.
2. How can I have no change in tempera-
ture from one time period to another?
VIEW
Simply select the same temperature for
eachconsecutivetimeperiod.Forexample,
you may select the same weekday EVE
coolingtemperatureasyoudidforweekday
programming, press
until you return to
PRGM
the point where you stopped programming.
Then you may continue to program the
thermostat normally. If you want to stop
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28
5. Why can’t I program the thermostat in
the AUTO mode?
RUN
programming at this point, press
to
PRGM
startthenormalprogramfunction.SeePRO-
GRAMMING YOUR THERMOSTAT.
The thermostat can only be programmed in
the HEAT and COOL modes. See PRO-
GRAMMING YOUR THERMOSTAT.
4. What happens if the electricity goes off
or is manually shut off?
6. What can cause the thermostat display
to freeze or go blank?
If you have not installed a 9 volt alkaline
battery, the display will go blank and the
program will be lost in approximately one
minute. When electricity is restored, the
thermostatwillmaintainaheatingtempera-
ture of 64°F and a cooling temperature of
82°F until you reenter your program. Set-
point temperature will not be displayed.
If a fresh 9 volt Energizer® alkaline battery
is installed, the program will be maintained
for about one week with no 24 VAC power
present to the thermostat. See OPERAT-
ING YOUR THERMOSTAT.
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.
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
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29
the wall and disconnect the battery. Wait 7. Why won’t the setpoint temperature go
about one minute, then reconnect the bat-
tery. The thermostat will revert to the fac-
torypresetprogramuntilyoureprogramthe
thermostat. If you don’t want to reprogram
to the temperature I want?
In the AUTO mode, the highest heating
setpoint temperature you select must be at
least 1°F lower than the lowest cooling
setpoint 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). If
such a conflict exists, you must set the
lowest cooling temperature higher in order
to set the heating temperature higher. To
set a lower cooling temperature, you must
select a lower heating temperature. See
PROGRAMMING YOUR THERMOSTAT.
SYSTEM
SWITCH
the thermostat immediately, press
until OFF is displayed and replace the ther-
RUN
mostatonthewall.Thenpress
tobegin
PRGM
the factory preset program. Or you may
reprogram the thermostat, then replace it
on the wall.
To prevent further static discharge prob-
lems, touch another object to release static
build-up before touching the thermostat.
See OPERATING YOUR THERMOSTAT.
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30
8. Why doesn’t the display light come on 10. Why won’t the system turn on, even
when I press a button? Why don’t I hear
a beep when I press a button?
though the thermostat display is func-
tioning normally?
Thedisplaylightandaudioprompting(beep)
onlyworkwhenthethermostatisonthewall
and 24 VAC power is present to the ther-
mostat. These features will not work on
battery power alone. See OPERATING
YOUR THERMOSTAT.
Either the compressor lockout feature is in
operation or the thermostat is not currently
calling for heat or cool. Wait about 5 min-
utes for the compressor lockout to expire. If
the system is still not running, read the
following cautionary statement on the
next page. Then, if conditions permit,
9. The display is flashing BAT. What does
this mean?
use the
or
buttons to move the
temperature above or below the setpoint
temperature. See OPERATING YOUR
THERMOSTAT.
The9voltbatteryinstalledinthethermostat
is low and should be replaced with a fresh
9 volt Energizer® alkaline battery. See OP-
ERATING YOUR THERMOSTAT.
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31
•
•
•
Youhaveprogrammedtheincorrectday
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 temperature below the setpoint tem-
perature. Property damage may result
due to compressor slugging.
The thermostat is in the HOLD mode.
RUN
Press
to start program operation.
PRGM
11. Why doesn’t the temperature change at
the time I programmed?
See OPERATING YOUR THERMO-
STAT.
There may be a number of causes for
this situation. The following are primary
reasons.
The compressor lockout feature is oper-
ating; wait about 5 minutes for system to
beginrunning.SeeOPERATINGYOUR
THERMOSTAT.
•
TheEMRfunctionisoperating.TheEMR
function will bring the system on auto-
matically to bring the temperature to the
selected level by the beginning of the
next program period. See OPERATING
YOUR THERMOSTAT.
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32
12. Why does the blower fan keep running 14. Between heating and cooling seasons, I
after the system has turned off?
want to turn my system off. Can I do this
without affecting my thermostat pro-
gramming?
•
You have programmed the fan to run
continuously during this period. See
PROGRAMMING YOUR THERMO-
STAT.
Any time you wish to turn your system off,
SYSTEM
SWITCH
simplypress
untilthedisplayshows
•
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.
OFF. This will not affect your thermostat’s
programming in any way. To turn the sys-
SYSTEM
SWITCH
tem back on, press
until HEAT,
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.
13. Why is the system turning on and off so
frequently (seldom)?
The anticipation setting is too low (high). To
change anticipation settings, see OPER-
ATING YOUR THERMOSTAT.
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33
15. I live in an area where daylight savings 16. Do I have to reprogram my thermostat
time is observed. How do I change the
thermostat clock twice a year without
affecting thermostat programming?
after I change the battery?
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, orifthethermostatisremovedfromthe
wall, the program will be retained for ap-
proximately one minute if there is no bat-
tery installed or if the installed battery is
dead. If you are changing the battery after
seeing a flashing BAT on the display, the
installed battery may be dead. If you re-
move the old battery and install a fresh one
within one minute, you should not lose your
thermostat programming. After installing a
new battery, follow the procedures in
CHECK YOUR PROGRAMMING to deter-
minewhetheryourprogrammingwasmain-
tained.
To change the clock, follow the instructions
for setting current time and day (see EN-
TERING YOUR PROGRAM). Thermostat
programming is not affected when you
change the clock.
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34
If the thermostat maintains programming,
SYSTEM
SWITCH
press
until OFF is displayed, put
the thermostat back on the wall, press
SYSTEM
SWITCH
againtoselecttheoperatingmode
RUN
you want, then press
to start program
PRGM
operation. If the program is lost, reprogram
the thermostat. See PROGRAMMING
YOUR THERMOSTAT.
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35
If you need further information on programming or operation, you
may write to our Technical Service Department at the address
shown below.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
Part No. 37-4739C
Replaces 37-4739B
9606
ST. LOUIS, MISSOURI 63123-5398
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