White Rodgers 1F91W 71 Thermostat User Manual

About Your New Thermostat . . .

Your new Digital COMFORT SET II Multi-stage Thermostat uses the technology of a solid-state

microcomputer to provide precise time/temperature control. The COMFORT SET II 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, you may write to our Technical Service Department at the address shown on the back

cover of this booklet.

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!

YOUR NEW THERMOSTAT’S FEATURES

• Computed Energy Management Recovery

• Manual program override (HOLD tempera-

(EMR)

ture)

• Automaticchangeover(operatorselectable)

• Five-day/two-day programming capability

• Simultaneous heat and cool program stor-

age

• Preprogrammed temperature control

• Four separate time and temperature set-

tings per 24-hour period

• Armchair programming capability

• Audioandvisualpromptingduringprogram-

ming

• Programmable blower control

• Two hour temperature override

• "Advance Program" button

• Backlit LCD displays continuous setpoint,

time, and room temperature

• Adjustable cycle times

• 9 volt Energizer^®alkaline battery backup

• Compressor short cycle protection

• Blower delay in the cooling cycle

• Up to three stages of heat and up to two

stages of cool

• Temperature range 40° to 99°F

• °F/°C convertibility

• Compatible with Remote Sensor (optional)

OPERATINGYOURTHERMOSTAT

Before you begin programming your new ther- The subbase is attached to the wall, but you can

mostat, you should be familiar with its features remove the thermostat body for easy program-

and with the display and the location and opera- ming. To remove the thermostat body from the

tion of the thermostat buttons. The information subbase, grasp the thermostat body and gently

in this section will help you become familiar with pull it out from the bottom of the subbase, then

your thermostat so that you can easily program pivot up. To attach the thermostat body, line up

it.

the four terminal pins on the upper section of the

thermostatbackwiththematchingconnectoron

Your thermostat consists of two parts: the the subbase. Insert these, then gently pivot the

thermostat body and the subbase.

thermostat body down to connect the nine pin

connectors on the lower portion of the thermo-

statback. Gentlypushuntilthesnapconnectors

engage. DONOTFORCEORPRYTHETHER-

MOSTAT, as this may damage the unit.

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.

power is restored. You must reprogram the

thermostat if this happens.

PARTS OF THE THERMOSTAT

If the word BAT is flashing in the display

window, the battery is low and should be

replaced with a fresh 9 volt Energizer^®alka-

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 ther-

mostat will automatically maintain a factory

preprogrammedheatingtemperatureof64°F

and a cooling temperature of 82°F after

Option switches

9-pin connector

BACK OF THERMOSTAT BODY

line battery. The battery will provide power 2. You may adjust option switch #4 for auto-

for all functions except the display light and

audioprompting,whichworkonlyon24 VAC

power. If the word BAT is displayed con-

tinuously (non-flashing), the thermostat 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

Before removing thermostat from the

wall to replace the battery, remove

24 VACpowerfromthethermostatatthe

breaker/fuse box.

Other than

and

, the buttons are

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.

locatedbehindthethermostatdoor. Toopenthe

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.

The word BAT flashes on the display when

the9voltalkalinebatteryisweakandshould

be replaced.

Following are brief descriptions of the display

and the thermostat buttons.

FAN

operating continuously, regardless of heat-

ing or cooling system cycling. FAN is

is displayed when the blower is

The Display

Continuouslydisplayssystemmode(HEAT,

OFF, COOL, AUTO, HOLD). During pro-

gramming, the program period is displayed

(MOR, DAY, EVE, NHT).

Alternately displays room temperature (F

denotesdegreesFahrenheitand Cdenotes

degrees Celsius) and time of day (A de-

notes AM time and P denotes PM time).

displayed during automatic fan operation

(when the blower cycles with the heating or

cooling system).

DAY

FAN

SYSTEM

HEAT - OFF - COOL - AUTO

TIME

FWD

SET

CLOCK

VIEW

PRGM

HOLD

TEMP

TIME

BACK

SET

DAY

RUN

PRGM

ADV

PRGM

FAN

ON - AUTO

DAY

FAN

DAY

BAT

FAN

The Thermostat Buttons

Used to start program operation after pro-

gramming. Also used to return thermostat

to program operation after being in HOLD

mode.

Used to manually override programming to

holdataselectedtemperature(whenHOLD

is displayed).

Used to advance thermostat program to the

next program period (for example, from the

MOR program to the DAY program).

Sets the system mode (HEATing, OFF,

COOLing, orAUTOmaticchangeover[user

selectable feature]).

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

button is also used to program the fan to run

continuously during a program period.

Runs display forward or backward through

time, day, or anticipation settings during

programming.

(Blue arrow) Lowers temperature set-

ting (40°F or 4°C minimum).

TIME

FWD

TIME

BACK

Used in conjunction with

and

(Red arrow) Raises temperature set-

ting (99°F or 37°C maximum)

The red light is on when the 1st stage

heating/cooling system is operating. The

yellow light is on when the 2nd or 3rd stage

heating/cooling system is operating.

set current time and day of the week.

Used during programming to set the day of

the week. Also used in conjunction with

SET

CLOCK

to enter anticipation setting mode.

Used to initiate or review thermostat pro-

gramming.

16 17

DAY

FAN

SYSTEM

HEAT - OFF - COOL - AUTO

TIME

FWD

SET

CLOCK

VIEW

PRGM

HOLD

TEMP

TIME

BACK

SET

DAY

RUN

PRGM

ADV

PRGM

FAN

ON - AUTO

11 12

14 15

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 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.

• 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

• COMPUTED ENERGY MANAGEMENT

RECOVERY (EMR) - The thermostat's mi-

crocomputer automatically calculates the

timeitwilltaketochangethetemperatureto

the next program setting. Then the thermo-

stat will activate the heating or cooling sys-

tem to change the temperature so that the

desired temperature is reached at the be-

ginning of the next program period. As an

example of this feature, assume that you

have programmed your thermostat to pro-

vide an overnight heating temperature of

power. If the switch is OFF (down), use a

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, put the thermostat back on the wall,

and restore 24 VAC power. To set the

thermostat for automatic changeover after

SYSTEM

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 highest 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).

programming, press

to set the ther-

HEAT - OFF - COOL - AUTO

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.

COOLING TEMPERATURES

DEAD BAND 1°F

HEATING TEMPERATURES

• TWO HOUR TEMPERATURE OVER-

RIDE — Press or until the

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.

• HOLD TEMPERATURE — The thermostat

can hold any temperature within its range

for an indefinite period, without reverting to

HOLD

• "ADVANCE PROGRAM" BUTTON —

ADV

PRGM

Press

to advance the thermostat pro-

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.

TIME

• °F/°C CONVERTIBILITY — Press

FWD

TIME

BACK

and

at the same time until the tem-

the program. Press

displayed. Then choose the desired hold

temperature by pressing or

. HOLD will be

TEMP

perature display is in °C (Celsius). To dis-

play °F, repeat the process.

• 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.

The thermostat will hold the room tempera-

ture at the selected setting until you press

RUN

PRGM

to start program operation again. This

featureisidealforenergyconservationwhen

cycletime.Tosetcoolinganticipation,press

CAUTION

SET

CLOCK

SET

DAY

and

at the same time again. The

A cooling anticipation setting of less

than 10 may cause decreased compres-

sor life.

display will show COOL 14 (factory

preprogrammed cooling anticipation). Use

TIME

FWD

TIME

BACK

the

and

buttons to adjust antici-

to return to your pro-

SET

CLOCK

SET

DAY

To adjust anticipation, press

and

RUN

PRGM

pation. Press

gram.

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.

• LOW BATTERY INDICATOR — The word

BAT will flash on the display if the 9 volt

alkaline battery is low and should be re-

placed.

• AUDIO PROMPTING — Each time you

pressabutton,thethermostatwillbeep(this

feature works only when the thermostat is

attached to the wall and 24 VAC power is

present to the thermostat).

TIME

FWD

If the heat cycles are too short, press

to increase the cycle time. If the heat cycles

TIME

BACK

are too long, press

to decrease the

• BACKLIT DISPLAY — When you press

any button on the thermostat, the display is

lit for approximately eight seconds (this fea-

ture works only when the thermostat is

attached to the wall and 24 VAC power is

present to the thermostat).

c) Pressing

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.

• 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 blower 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 CONTROL

— You may program the fan blower to run

continuously during any given program pe-

riod, regardless of the cycling of the heating

or cooling system. During programming,

after entering the time and temperature for

FAN

a) Return of power after a power outage.

the time period, press

until FAN

ON - AUTO

SYSTEM

HEAT - OFF - COOL - AUTO

b) Pressing

modes.

to change operating

appears. To override constant fan, press

FAN

ON - AUTO

until FAN

appears.

PROGRAMMINGYOURTHERMOSTAT

Now you are ready to program your thermostat.

This section will help you plan and program your

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 Fri-

day, and the two-day program is set to run

SaturdayandSunday.However,youmaychoose

any five consecutive days to be your weekday

program days (such as Sunday through Thurs-

day; in this case, your weekend program would

run on Friday and Saturday).

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.

• During early morning hours, the need for

cooling is usually minimal.

First, youshouldanswerthefollowingquestions

to help you decide what your needs are. If you

are using the thermostat for a commercial appli-

cation (a store, office building, etc.), answer

questions 1 through 4. If you are using the 3a. What time do the building occupants reach

thermostat in your home, answer questions 5

through 8. Keep in mind that you should plan for

both weekday and weekend programs.

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:

1a. What time does the first person arrive at the

building in the morning?

b. What temperature should the building be at

this time? (heating? cooling?) These will be

your MOR (morning) temperature settings.

4a. What time does the building become va-

cant?

b. What temperature should the building be at

this time? These will be your NHT (night)

temperature settings.

2a. What time do the building occupants reach

amaximumactivitylevel(usinglights,equip-

ment, meeting rooms, etc.)?

b. What temperature should the building be at

this time? These will be your DAY tempera-

ture settings.

IN YOUR HOME:

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

morning?

b. What temperature should the house be at

this time? These will be your MOR (morn-

ing) temperature settings.

6a. What time does the last person leave the Now look at the factory preprogrammed times

house in the morning?

and temperatures shown at the top of the next

page. If this program will suit your needs, simply

b. What temperature should the house be at

this time? These will be your DAY tempera-

ture settings.

RUN

PRGM

press

to begin running the factory preset

program.

7a. What time does the first person arrive home

in the evening?

b. What temperature should the house be at

this time? These will be your EVE (evening)

temperature settings.

If you want to change the preprogrammed times

and temperatures, do the following.

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).

8a. What time does the last person go to bed at

night?

b. What temperature should the house be at

this time? These will be your NHT (night)

temperature settings.

COOLING TEMPERATURES

DEAD BAND 1°F

HEATING TEMPERATURES

FACTORY PREPROGRAMMING

Cooling Program for ALL Days of the Week:

Heating Program for ALL days of the Week:

TEMP

PERIOD

MOR

DAY

EVE

NHT

TIME

TEMP

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 MOR heating start time and temperature, and

cooling temperatures for your weekday pro- choose 7:00 AM and 76° as the weekday MOR

gram. You must program 4 periods for each day cooling start time and temperature). Use the

(MOR, DAY, EVE, and NHT). However, you following table to plan your program time peri-

mayusethesameheatingandcoolingtempera- ods,andthetemperaturesyouwantduringeach

tures for consecutive time periods. You can period. You may also want to look at the sample

choose start times, heating temperatures, and program table to get an idea of how the thermo-

cooling temperatures independently for both stat can be programmed.

weekday and weekend programs (for example,

youmayselect5:00AMand70° astheweekday

Heating/Cooling Schedule Plan

WEEKEND (2 DAY)

WEEKDAY (5 DAY)

Start

Time

Start

Time

Temperature

MOR HEAT

DAY HEAT

EVE HEAT

NHT HEAT

MOR COOL

DAY COOL

EVE COOL

NHT COOL

SAMPLE

Heating/Cooling Schedule Plan

WEEKEND (2 DAY)

WEEKDAY (5 DAY)

Start

Time

Start

Time

Temperature

68°

Temperature

68°

MOR HEAT

DAY HEAT

EVE HEAT

NHT HEAT

MOR COOL

DAY COOL

EVE COOL

NHT COOL

5:30 AM

7:30 AM

2:00 PM

6:00 PM

12:00 AM

8:00 AM

2:00 PM

6:00 PM

12:00 AM

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°

66°

76°

74°

78°

Set Current Time and Day

ENTERING YOUR PROGRAM

SET

CLOCK

Follow these steps to enter the heating and

cooling programs you have selected.

1. Press

once. The display will show

minutes only.

EXAMPLE:

NOTE

TIME

FWD

TIME

BACK

2. Press and hold either

until you

We recommend that you remove the thermostat

from the wall for programming (especially for

entering cooling programming). A fresh 9 volt

Energizer^®alkaline battery must be installed to

perform off-wall programming. BE SURE SYS-

TEM SWITCH IS SET TO OFF POSITION BE-

FORE REATTACHING THERMOSTAT TO

SUBBASE!

reach the correct minutes.

SET

CLOCK

3. Press

once. The display window will

show the hour only.

EXAMPLE:

TIME

FWD

TIME

BACK

4. Press and hold either

until you

reachthecorrecthourandAM/PMdesigna-

tion (AM begins at midnight; PM begins at

noon).

NOTE

You cannot program the thermostat with the

SYSTEM SWITCH in the AUTO position.

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

BACK

6. Press and hold either

until you

program operation.

reach the current day of the week.

SYSTEM

HEAT - OFF - COOL - AUTO

RUN

PRGM

1. Press

2. Press

until HEAT is displayed.

7. Press

once. The display will show the

VIEW

PRGM

correct time and room temperature alter-

nately.

once. 5 DAY (indicating week-

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.

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

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.

8. Repeat steps 3 through 7 for the weekday

EVE and NHT heating programs.

3. To change the displayed start time to your

selected start time for weekday MOR heat

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

TIME

FWD

TIME

BACK

program, press

until your

selectedtimeappears. Thetimewillchange

in 15 minute increments.

4. Press

until you reach your

selected weekday MOR heating tempera-

ture.

heating program, press

PRGM

5. If you want the fan to run continuously

FAN

ON - AUTO

during this period, press

until FAN

is displayed.

VIEW

PRGM

6. Press

.Thecurrentlyprogrammedstart

time and heating temperature for weekday

DAY will be displayed.

Enter Cooling Program

SYSTEM

- OFF - COOL - AUTO

1. Press

until COOL appears.

HEAT

CAUTION

2. Enter your cooling program by following the

procedure for entering your heating pro-

gram.

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

mustbeinstalledtoperformoff-wallpro-

gramming Programming away from the

wallshouldpreventaccidentalcompres-

sor 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

HEAT - OFF - COOL - AUTO

1. Press

until HEAT is displayed.

VIEW

PRGM

2. Press and hold

to view the heating

period times and temperatures in sequence

for weekday MOR, DAY, EVE, and NHT,

then for weekend MOR, DAY, EVE, and

NHT.

SYSTEM

HEAT - OFF - COOL - AUTO

RUN

PRGM

3. Press

4. Press

Press

until OFF is displayed. Reattach

SYSTEM

HEAT - OFF - COOL - AUTO

SYSTEM

HEAT - OFF - COOL - AUTO

thermostat to subbase. Then press

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

ON - AUTO

RUN

PRGM

displayed (automatic cycling).

6. Press

to begin program operation.

YOURTHERMOSTATISNOWCOMPLETELY

PROGRAMMEDANDREADYTOAUTOMATI-

CALLYPROVIDEMAXIMUMCOMFORTAND

EFFICIENCY!

QUESTIONS AND ANSWERS

1. How can I permanently change a part of 3. How can I finish my programming if the

my program?

display has already changed to time/

temperature?

VIEW

PRGM

Press

until you reach the time/tem-

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

perature schedule you want. Then press

TIME

FWD

TIME

BACK

and

tochange

the program. See PROGRAMMING YOUR

THERMOSTAT.

programming, press

until you return to

PRGM

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

change when the EVE period begins. See

the point where you stopped programming.

Then you may continue to program the

thermostat normally. If you want to stop

RUN

programming at this point, press

PRGM

startthenormalprogramfunction.SeePRO-

GRAMMING YOUR THERMOSTAT.

PROGRAMMING YOUR THERMOSTAT.

4. What happens if the electricity goes off 5. Why can’t I program the thermostat in

or is manually shut off?

the AUTO mode?

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

thermostat will maintain a heating tempera-

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.

The thermostat can only be programmed in

the HEAT and COOL modes. See PRO-

GRAMMING YOUR THERMOSTAT.

6. What can cause the thermostat display

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.

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 7. Why won’t the setpoint temperature go

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

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

HEAT - OFF - COOL - AUTO

the thermostat immediately, press

until OFF is displayed and replace the ther-

RUN

PRGM

mostat on the wall. Then press

begin the factory preset program. Or you

may reprogram the thermostat, then re-

place 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.

8. Why doesn’t the display light come on

when I press a button? Why don’t I hear

a beep when I press a button?

Thedisplaylightandaudioprompting(beep)

onlyworkwhenthethermostatisonthewall

and 24 VAC power is present to the thermo-

stat. These features will not work on battery

power alone. See OPERATING YOUR

THERMOSTAT.

systemisstillnotrunning, readthefollowing

cautionary statement. Then, if conditions

permit, use the

buttons to

move the temperature above or below the

setpoint temperature. See OPERATING

YOUR THERMOSTAT.

9. The display is flashing BAT. What does

this mean?

CAUTION

If the outside temperature is below 50°F,

DONOTusethe buttontomovethe

temperaturebelowthesetpointtempera-

ture. Property damage may result due to

compressor slugging.

The 9 volt battery installed in the thermostat

is low and should be replaced with a fresh 9

voltEnergizer^®alkalinebattery. SeeOPER-

ATING YOUR THERMOSTAT.

10. Why won’t the system turn on, even

though the thermostat display is func-

tioning normally?

11. Why doesn’t the temperature change at

the time I programmed?

Either the compressor lockout feature is in

operation or the thermostat is not currently

callingforheatorcool.Waitabout5minutes

for the compressor lockout to expire. If the

There may be a number of causes for this

situation. The following are primary rea-

sons.

•

TheEMRfunctionisoperating.TheEMR 12. Why does the blower fan keep running

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.

after the system has turned off?

•

You have programmed the fan to run

continuously during this period. See

PROGRAMMING YOUR THERMO-

STAT.

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

•

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.

•

13. Why is the system turning on and off so

frequently (seldom)?

Press

to start program operation.

PRGM

See OPERATING YOUR THERMO-

STAT.

The compressor lockout feature is oper-

ating; wait about 5 minutes for system to

begin running. SeeOPERATING YOUR

THERMOSTAT.

The anticipation setting is too low (high). To

change anticipation settings, see OPER-

ATING YOUR THERMOSTAT.

14. Between heating and cooling seasons, I 15. I live in an area where daylight savings

want to turn my system off. Can I do this

withoutaffectingmythermostatprogram-

ming?

time is observed. How do I change the

thermostat clock twice a year without

affecting thermostat programming?

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.

Any time you wish to turn your system off,

SYSTEM

HEAT - OFF - COOL - AUTO

simply press

until the display shows

OFF. This will not affect your thermostat's

programming in any way. To turn the sys-

SYSTEM

tem back on, press

until HEAT,

HEAT - OFF - COOL - AUTO

16. Do I have to reprogram my thermostat

after I change the battery?

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.

When the thermostat is on the wall and the

system has power, the thermostat is being

lost, or if the thermostat is removed from the

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

installedbatterymaybedead.Ifyouremove

the old battery and install a fresh one within

one minute, you should not lose your ther-

mostat programming. After installing a new

battery, follow the procedures in CHECK

YOUR PROGRAMMING to determine

whetheryourprogrammingwasmaintained.

If the thermostat maintains programming,

SYSTEM

HEAT - OFF - COOL - AUTO

press

until OFF is displayed, put the

SYSTEM

HEAT - OFF - COOL - AUTO

thermostat back on the wall, press

again to select the operating mode you

RUN

PRGM

want, then press

to start program

operation. If the program is lost, reprogram

the thermostat. See PROGRAMMING

YOUR THERMOSTAT.