White Rodgers 1F91 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

• “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)

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.

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 thermostat if this happens.

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.

Other than

and

, the buttons are

Displays the setpoint temperature.

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

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,

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).

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

/AUTO

DAY

FAN

DAY

BAT

FAN

The Thermostat Buttons

Used to initiate or review thermostat pro-

gramming.

Sets the system mode (HEATing, OFF,

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

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

BACK

and day of the week.

(Blue arrow) Lowers temperature setting

(40°F or 4°C minimum).

Used during programming to set the day of

SET

(Red arrow) Raises temperature setting

(99°F or 37°C maximum)

the week. Also used with

anticipation setting mode.

to enter

CLOCK

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

16 17

DAY

FAN

DIGITAL MULTI-STAGE COMFORT-SET

W H I T E - R O D G E R S

TIME

FWD

SET

CLOCK

VIEW

PRGM

HOLD

TEMP

SYSTEM

SWITCH

HEAT/OFF/COOL/AUTO

FAN

SWITCH

TIME

BACK

SET

DAY

RUN

PRGM

ADV

PRGM

/AUTO

11 12

14 15

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

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)

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.

COOLING TEMPERATURES

DEAD BAND 1°F

HEATING TEMPERATURES

• 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

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

DAY

and

at the same time again. The

CLOCK

display will show COOL 14 (factory prepro-

TIME

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.

• 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

until

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.

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?

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?

COOLING TEMPERATURES

b. What temperature should the house be at

this time? These will be your NHT (night)

temperature settings.

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 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

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

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°

66°

76°

74°

78°

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

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

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.

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

until you

BACK

RUN

programming at any time, simply press

resume program operation.

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

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

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

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.

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.

RUN

SYSTEM

SWITCH

3. Press

4. Press

Press

until OFF is displayed. Reattach

PRGM

SYSTEM

SWITCH

thermostat to subbase. Then press

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!

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

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

5. Why can’t I program the thermostat in

the AUTO mode?

RUN

programming at this point, press

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

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.

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

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.

•

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.

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.

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

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.

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.