White Rodgers 1F90 51 Thermostat User Manual

About Your New Thermostat . . .

Your new White-Rodgers Digital Thermostat uses the technology of a solid-state microcomputer

to provide precise time/temperature control. This thermostat offers you the flexibility to design

heating and cooling programs that fit your needs.

Please read this manual thoroughly before operating or programming your thermostat. If you have

questions, write to us at the address shown on the back cover of this manual.

In This Guide . . .

YOUR NEW THERMOSTAT’S

PROGRAMMING YOUR

FEATURES ............................................ 4

OPERATING YOUR THERMOSTAT ......... 5

PARTS OF THE THERMOSTAT

The Back Of the Thermostat Body

The Display

THERMOSTAT .................................... 19

PLANNING FOR YOUR NEEDS

ENTERING YOUR PROGRAM

Set Current Time and Day

Enter Heating Program

The Thermostat Buttons

Enter Cooling Program

OPERATING FEATURES

CHECK YOUR PROGRAMMING

QUESTIONS AND ANSWERS................. 29

Operator: Save this

booklet for future use!

YOUR NEW THERMOSTAT’S FEATURES

• Separate5-day(weekday)and2-day(week-

• Adjustable cycle times

end) setback programming

• Compressor short cycle protection

• Programmable blower control

• Blower delay in the cooling cycle

• Audio and visual prompting during operation

• Two hour temperature override

• Simultaneousheatandcoolprogramstorage

• Fourseparatetime/temperaturesettingsper

24-hour period

• Computed Energy Management Recovery

(EMR)

• Manual program override (HOLD tempera-

ture)

• Armchair programming capability

• Backlit LCD displays continuous set point,

time, and room temperature

• 1.5 volt “AA” Energizer^®alkaline battery

• “Advance Program” key

• °F/°C convertibility

• Temperature range 40° to 99°F

backup

• Preprogrammed temperature control

OPERATING YOUR THERMOSTAT

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

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

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

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

this section will help you become familiar with pull it straight out from the subbase. To attach

your new thermostat so that you can easily the thermostat body, line up the two terminal

program it.

pins on the lower section of the thermostat back

with the matching connector on the subbase.

Insert these, then gently pivot the thermostat

body up to connect the six pin connectors on the

upper portion of the thermostat back. Gently

push until the snap connectors engage. DO

NOT FORCE OR PRY THE THERMOSTAT, as

this may damage the unit.

Your thermostat consists of two parts: the ther-

mostat body and the subbase.

CAUTION

Remove power from the system at the

circuit breaker/fuse box before remov-

ing or attaching the thermostat body.

Equipment damage and/or personal in-

jury could occur.

If the word BATTERY is flashing in the display

window, the batteries are low and should be

replaced with fresh “AA” Energizer^®alkaline

batteries.

PARTS OF THE THERMOSTAT

The Back of The Thermostat Body

Turn the thermostat body over. On the back are

the 3 “AA” Energizer^®alkaline batteries.

CAUTION

The “AA” Energizer^®alkaline batteries provide

powertothethermostatwhenthe24 VACpower

is interrupted (for example, when you remove

the thermostat from the wall for programming).

Fresh batteries will maintain the stored program

for approximately a year. If power loss is long

enough for the program to be lost, the thermo-

stat will automatically return to the factory pro-

grammed temperatures (64°F heating and 82°F

cooling) when power is restored. You must

reprogram the thermostat if this happens.

SYSTEM

SWITCH

Use

to turn the thermostat OFF

beforeremovingthethermostatfromthe

wall to replace batteries.

Other than

and

, the buttons are

Batteries

6-pin connector

locatedbehindthethermostatdoor. Toopenthe

door, put your fingernail in the indentation at the

topofthedoor,thenpullthedooroutfromthetop

and swing it down on its hinges.

On the following pages there are brief descrip-

tions of the display and the thermostat buttons.

2-pin connector

BACK OF THERMOSTAT BODY

The Display

The word BATTERY flashes on the display

when the “AA” alkaline batteries are weak

and should be replaced. The word BAT-

TERY is displayed continuously (non-flash-

ing) when thermostat is running on battery

power only.

Continuouslydisplayssystemmode(HEAT,

OFF,COOL, HOLD).Duringprogramming,

theprogramperiodisdisplayed(MOR,DAY,

EVE, or NHT).

Alternately displays room temperature (F

FAN ON is displayed when the blower is

denotesdegreesFahrenheitand Cdenotes

degrees Celsius) and time of day (A de-

notes AM time and P denotes PM time).

operating continuously. FAN AUTO is dis-

playedduringautomaticfanoperation(when

theblowercycleswiththeheatingorcooling

system).

Displays the setpoint temperature.

5 DAY indicates that the displayed program

is the weekday program. 2 DAY indicates

that the displayed program is the weekend

program.

5 DAY

FAN AUTO

WHITE-RODGERS

DIGITAL COMFORT SET II

TIME

FWD

SET

VIEW

HOLD

TEMP

SYSTEM

SWITCH

CLOCK

PRGM

HEAT-OFF-COOL-AUTO

FAN

SWITCH

TIME

SET

DAY

RUN

ADV

BACK

PRGM

ON-AUTO

2 DAY

FAN AUTO

5 DAY

FAN ON

BATTERY

The Thermostat Buttons

Used to initiate or review thermostat pro-

gramming.

Sets the system mode (HEATing, OFF, or

COOLing).

Used to start program operation after pro-

gramming.Alsousedtoreturnthermostatto

program operation after being in HOLD

mode.

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

button is also used to program the fan to run

continuously during a program period.

Used to manually override programming to

Runs display forward or backward through

holdataselectedtemperature(whenHOLD

is displayed).

time, day, or anticipation settings during

programming.

TIME

FWD

TIME

Used to advance thermostat program to the

Used with

and

to set current time.

BACK

next program period (for example, from the

MOR program to the DAY program).

TIME

FWD

TIME

to set the day of the

BACK

SET

(Red arrow)

Raises temperature set-

week. Also used in conjunction with

enter anticipation setting mode.

CLOCK

ting (99°F or 37°C maximum).

(Blue arrow)

Lowers temperature set-

Theredindicatorlightglowswheneverheat-

ing, cooling, or fan are in operation.

ting (40°F or 4°C minimum).

17 16

5 DAY

FAN AUTO

WHITE-RODGERS

DIGITAL COMFORT SET II

TIME

FWD

SET

VIEW

HOLD

TEMP

SYSTEM

SWITCH

CLOCK

PRGM

HEAT-OFF-COOL-AUTO

FAN

SWITCH

TIME

SET

DAY

RUN

ADV

BACK

PRGM

ON-AUTO

10 11 12 13 14 15

next program period, beginning at 6:00 AM,

you have programmed a temperature of

70°F. The thermostat will automatically ac-

tivate the heating system at about 5:00 AM,

so that the programmed 70°F temperature

is reached by about 6:00 AM.

OPERATING FEATURES

Now that you are familiar with the thermostat

display and buttons, read the following informa-

tion to learn about the many features of the

thermostat.

• COMPUTED ENERGY MANAGEMENT

RECOVERY (EMR) — The thermostat’s

microcomputer can be set to automatically

calculate the time it will take to change the

temperature to the next program setting.

Then the thermostat will activate the heat-

ing or cooling system to change the tem-

perature so that the desired temperature is

reached at the beginning of the next pro-

gram period. As an example of this feature,

assume that you have programmed your

thermostat to provide an overnight heating

temperature of 62°F, and that during the

The thermostat is configured at the factory

so that this feature is disabled. If you wish to

have this feature, refer to the installation

instructions for this thermostat, or contact

your local heating/cooling contractor.

• TWO HOUR TEMPERATURE OVER-

RIDE — Press

until the dis-

play shows the temperature you want. The

thermostat will override current program-

ming and keep the room temperature at the

selected temperature for two hours. After

two hours, the thermostat will automatically

revert to the program.

• HOLD TEMPERATURE — The thermostat

can hold any temperature within its range

for an indefinite period, without reverting to

HOLD

key while in the DAY program will advance

the thermostat to the EVE program, which

will remain in effect until the NHT program

begins).

the program. Press

. HOLD will be dis-

TEMP

TIME

• °F/°C CONVERTIBILITY — Press

and

played. Then choose the desired hold tem-

perature by pressing or . The

thermostat will hold the room temperature

FWD

TIME

at the same time until the temperature

BACK

display is in °C (Celsius). To display °F,

repeat the process.

RUN

at the selected setting until you press

PRGM

start program operation again. This feature

is ideal for energy conservation when the

building is unoccupied for an extended pe-

riod of time.

• ADJUSTABLE HEATING AND COOLING

CYCLE TIMES (ANTICIPATION) — If the

heating/cooling system is turning on and off

too often (short cycles) or not often enough

(long cycles), you may want to adjust the

anticipation setting.

• “ADVANCE PROGRAM” KEY — Press

ADV

to change the thermostat to the next

PRGM

program period. This will temporarily over-

ride the program, until the next program

period begins (for example, pressing this

TIME

CAUTION

heat cycles are too long, press

to de-

BACK

Acoolinganticipationsettingoflessthan

10maycausedecreasedcompressorlife.

creasethecycletime. Toset coolingantici-

SET

DAY

pation, press

and

at the same time

CLOCK

SET

again. The display will show COOL 14 (fac-

tory preprogrammed cooling anticipation).

Youmayselectanyanticipationsettingfrom

To adjust heat anticipation, press

and

CLOCK

SET

at the same time. The display will show

DAY

TIME

FWD

TIME

HEAT 5 (this is the factory preprogrammed

heating anticipation setting). You may se-

lect any anticipation setting from 2 to 40

(note that for hydronic systems, a mini-

mum anticipation setting of 15 is recom-

mended).Wheneveradjustinganticipation,

increase or decrease the displayed number

by only one or two digits, then let the system

run for a while to see if the adjustment is

sufficient. If the heat cycles are too short,

TIME

4 to 40. Use

tion. Press

and

to adjust anticipa-

BACK

RUN

PRGM

to return to your program.

• LOW BATTERY INDICATOR — The word

BATTERY will flash on the display if the

“AA” alkaline batteries are low and should

be replaced. The word BATTERY will be

displayedcontinuously(non-flashing)when

24 VAC power is not being supplied to the

thermostat and the thermostat is operating

on battery power only.

press

to increase the cycle time. If the

FWD

• AUDIO PROMPTING — Each time you

press a button, the thermostat will beep.

• COMPRESSORSHORTCYCLEPROTEC-

TION — To protect your compressor from

potential damage due to rapid cycling, this

thermostat has a built-in delay of 5 minutes

between cooling cycles. The following may

cause a time delay in COOL:

• BACKLIT DISPLAY — When you press

any button on the thermostat, the display is

lit for approximately eight seconds.

• SYSTEM INDICATOR LIGHT — The red

lightontheupperrightpartofthethermostat

indicatessystemoperation(seePARTSOF

THE THERMOSTAT).

a) Return of power after a power outage.

SYSTEM

SWITCH

b) Pressing

modes.

to change operating

c) Pressing

, creating a call for COOL

too soon after a previous call.

PROGRAMMINGYOURTHERMOSTAT

Now you are ready to program your thermostat.

This section will help you plan your thermostat’s

program to meet your needs.

PLANNING FOR YOUR NEEDS

First, answer the following questions to help you

decide what your needs are. If you are using the

thermostatforacommercialapplication(astore,

officebuilding,etc.),answerquestions1through

4. If you are using the thermostat in your home,

answer questions 5 through 8.

For maximum comfort and efficiency, keep the

following guidelines in mind when planning your

program.

• When heating (cooling) your building, pro-

gramthetemperaturestobecooler(warmer)

when the building is vacant or during peri-

ods of low activity.

FOR COMMERCIAL APPLICATIONS:

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

building in the morning?

• During early morning hours, the need for

cooling is usually minimal.

b. What temperature should the building be at

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

your MOR (morning) temperature settings.

2a. What time do the building occupants reach

amaximumactivitylevel(usinglights,equip-

ment, meeting rooms, etc.)?

b. What temperature should the building be at

this time? These will be your DAY tempera-

ture settings.

b. What temperature should the house be at

this time? These will be your MOR (morn-

ing) temperature settings.

3a. What time do the building occupants reach 6a. What time does the last person leave the

a minimum activity level (limited personnel

in building)?

house in the morning?

b. What temperature should the house be at

this time? These will be your DAY tempera-

ture settings.

b. What temperature should the building be at

thistime? ThesewillbeyourEVE (evening)

temperature settings.

7a. What time does the first person arrive home

in the evening?

4a. What time does the building become va-

cant?

b. What temperature should the house be at

thistime? ThesewillbeyourEVE (evening)

temperature settings.

b. What temperature should the building be at

this time? These will be your NHT (night)

temperature settings.

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

night?

IN YOUR HOME:

b. What temperature should the house be at

this time? These will be your NHT (night)

temperature settings.

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

morning?

Now look at the factory preprogrammed times choose start times, heating temperatures, and

and temperatures shown below. If this program cooling temperatures independently for both

weekday and weekend programs (for example,

RUN

will suit your needs, simply press

to begin

PRGM

youmayselect5:00AMand70° astheweekday

MOR heating start time and temperature, and

choose 7:00 AM and 76° as the weekday MOR

cooling start time and temperature).

running the factory preset program.

If you want to change the preprogrammed times

and temperatures, do the following.

Use the following table to plan your program

time periods, and the temperatures you want

duringeachperiod. Youmayalsowanttolookat

the sample program table to get an idea of how

the thermostat can be programmed.

Determine the time periods and heating and

cooling temperatures for your weekday pro-

gram. You must program 4 periods for each day

(MOR, DAY, EVE, and NHT). However, you

mayusethesameheatingandcoolingtempera-

tures for consecutive time periods. You can

FACTORY PREPROGRAMMING

Cooling Program for ALL Days of the Week:

Heating Program for ALL days of the Week:

TEMP

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

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°F

7:00 AM

11:00 AM

6:00 PM

11:30 PM

7:00 AM

12:30 PM

6:00 PM

11:30 PM

68°F

8:00 AM

5:00 PM

10:30 PM

6:30 AM

2:00 PM

5:00 PM

10:30 PM

65°F

70°F

65°F

76°F

78°F

72°F

78°F

70°F

65°F

76°F

74°F

72°F

78°F

Set Current Time and Day

ENTERING YOUR PROGRAM

SET

Follow these steps to enter the heating and

cooling programs you have selected.

1. Press

once. The display will show min-

CLOCK

utes only.

NOTE

EXAMPLE:

We recommend that you remove the thermostat

from the wall for programming (especially for

entering cooling programming). Fresh “AA” En-

ergizer^®alkaline batteries must be installed to

perform off-wall programming. BE SURE TO

SYSTEM

TIME

FWD

TIME

2. Press and hold either

until you

BACK

reach the correct minutes.

SET

3. Press

once. The display window will

CLOCK

show the hour only.

EXAMPLE:

USE

TO TURN THERMOSTAT OFF

SWITCH

BEFORE REATTACHING THERMOSTAT TO

SUBBASE!

TIME

FWD

TIME

4. Press and hold either

until you

BACK

reachthecorrecthourandAM/PMdesigna-

tion (AM begins at midnight; PM begins at

noon).

youareatthepointwhereyoustoppedprogram-

ming. Then you may continue to enter your

programs normally. If you want to stop program-

RUN

SET

DAY

5. Press

once. The display will show the

day of the week as an abbreviation (MO for

Monday, TU for Tuesday, etc.).

ming at any time, simply press

to resume

PRGM

TIME

FWD

TIME

6. Press and hold either

until you

BACK

program operation.

reach the current day of the week.

SYSTEM

SWITCH

1. Press

2. Press

until HEAT is displayed.

RUN

7. Press

once. The display will show the

PRGM

VIEW

once.5DAY(indicatingweekday

PRGM

correct time and room temperature alter-

nately.

program),andMOR,representingthemorn-

ing heating period, will appear in the dis-

play. Also displayed are the currently pro-

grammed start time for the MOR period and

the currently programmed temperature.

Enter Heating Program

During programming, if you don’t press any

buttons for 5 minutes, the thermostat will enter

the HOLD mode and will maintain a constant

temperature. The display will revert to the alter-

natingtime/temperaturedisplay.Toresumepro-

VIEW

EXAMPLE:

5 DAY

This display window shows that for the

weekday MOR period, the start time is 5:00

gramming after this happens, press

until

PRGM

AM, and 70° is the programmed tempera- 7. Repeat steps 3 through 5 to select the start

ture (this example reflects factory prepro-

gramming).

time and heating temperature for the week-

day DAY program.

3. To change the displayed start time to your 8. Repeat steps 3 through 7 for the weekday

selected start time for weekday MOR heat

EVE and NHT heating programs.

TIME

FWD

TIME

9. After entering your weekday heating pro-

gram, repeat steps 1 through 8 for your

weekend programming (keep in mind that

for weekend programming, the display

should be changed from 5 DAY to 2 DAY).

program, press

until your se-

BACK

lected time appears. The time will change in

15 minute increments.

4. Press

until you reach your

selectedweekdayMORheatingtemperature.

10. When you have completed entering your

5. If you want the fan to run continuously

RUN

heating program, press

PRGM

FAN

during this period, press

FAN is displayed.

VIEW

until PRG

SWITCH

6. Press _PRGM. The currently programmed start

time and heating temperature for weekday

DAY will be displayed.

Enter Cooling Program

SYSTEM

SWITCH

1. Press

until COOL appears.

CAUTION

2. Followtheprocedureforenteringyourheat-

ing program, using your selected cooling

times and temperatures.

If outside temperature is below 50°F, we

recommend that you remove the ther-

mostat from the wall before proceeding

withthefollowingstepstoprogramcool-

ing temperatures. Personal injury or

property damage may occur due to air

conditionercompressorslugging.Fresh

“AA” Energizer^®alkaline batteries must

be installed to perform off-wall program-

ming. Programming away from the wall

should prevent accidental compressor

SYSTEM

CHECK YOUR PROGRAMMING

Follow these steps to check your thermostat

programming one final time before beginning

thermostat operation.

SYSTEM

SWITCH

1. Press

until HEAT is displayed.

VIEW

2. Press and hold

to view the heating

PRGM

period times and temperatures in sequence

for weekday, then weekend MOR, DAY,

EVE, and NHT program periods.

operation. USE

TO TURN THER-

SWITCH

MOSTAT OFF BEFORE REATTACHING

THE THERMOSTAT TO THE SUBBASE!

RUN

3. Press

PRGM

SYSTEM

SWITCH

SYSTEM

SWITCH

4. Press

until COOL is displayed.

Press

until OFF is displayed. Reattach

thermostat to subbase. Turn on power to the

5. Repeat step 2 to check cooling tempera-

tures.

SYSTEM

system. Thenpress

toselecttheopera-

SWITCH

RUN

tion mode you want (HEAT or COOL). Press

6. Press

to begin program operation.

PRGM

FAN

SWITCH

until FAN AUTO is displayed (auto-

YOURTHERMOSTATISNOWCOMPLETELY

PROGRAMMEDANDREADYTOAUTOMATI-

CALLYPROVIDEMAXIMUMCOMFORTAND

EFFICIENCY!

matic cycling).

QUESTIONS AND ANSWERS

1. How can I permanently change a part of

DAY, which means the temperature will not

change when the EVE period begins. See

PROGRAMMING YOUR THERMOSTAT.

my program?

VIEW

Press

untilyoureachthetime/tempera-

PRGM

3. How can I finish my programming if the

display has already changed to time/

temperature?

TIME

FWD

ture schedule you want. Then press

TIME

and

to change the

BACK

During programming, if no buttons are

pressed for five minutes, the thermostat will

enter the HOLD mode and maintain a con-

stant temperature. The display will change

to the time/temperature mode. To resume

VIEW

program. See PROGRAMMING YOUR

THERMOSTAT.

2. How can I have no change in tempera-

ture from one time period to another?

programming, press

until you return to

PRGM

Simply select the same temperature for

eachconsecutivetimeperiod. Forexample,

you may select the same weekday EVE

cooling temperature as you did for weekday

the point where you stopped programming.

Then you may continue to program the

thermostat normally. If you want to stop

power present to the thermostat. See OP-

ERATING YOUR THERMOSTAT.

RUN

programmingatthispoint, press

tostart

PRGM

the normal program function. See PRO-

GRAMMING YOUR THERMOSTAT.

5. What can cause the thermostat display

to freeze or go blank?

4. What happens if the electricity goes off

or is manually shut off?

A completely blank display may indicate

that power has been lost to the thermostat

and the backup battery is also dead. How-

ever, if there is power to the thermostat and

the display is blank or frozen, static dis-

charge is probably the cause.

If you have not installed 3 “AA” alkaline

batteries, the display will go blank and the

program will be lost in approximately one

minute. When electricity is restored, the

clock will reset itself to 12:00 PM (noon) and

the thermostat will maintain a heating tem-

perature of 64°F and a cooling temperature

of 82°F until you reenter your program.

Setpoint temperature will not be displayed.

During periods of low humidity (especially

during cold weather), you may feel or see a

spark discharge when you touch the ther-

mostat. This may cause the program to be

lost or the thermostat to display incorrectly.

To correct this, remove the thermostat from

the wall and disconnect the battery. Wait

about one minute, then reconnect the bat-

If fresh “AA” Energizer^®alkaline batteries

are installed, the program will be main-

tained for about one year with no 24 VAC

tery. Thethermostatwillreverttothefactory

preset program until you reprogram the

thermostat. If you don’t want to reprogram

SYSTEM

fresh“AA”Energizer^®alkalinebatteries.See

OPERATING YOUR THERMOSTAT.

7. The display shows a continuous (non-

flashing) BATTERY. What does this

mean?

the thermostat immediately, press

SWITCH

until OFF is displayed and replace the ther-

The thermostat is not being supplied with

24 VAC power. The thermostat is operating

on battery power alone. See OPERATING

YOUR THERMOSTAT.

RUN

mostat on the wall. Then press

to begin

PRGM

the factory preset program. Or you may

reprogramthethermostat,thenreplaceiton

the wall.

8. Why won’t the compressor turn on, even

though the thermostat display is func-

tioning normally?

To prevent further static discharge prob-

lems, touch another object to release static

build-up before touching the thermostat.

See OPERATING YOUR THERMOSTAT.

Either the compressor lockout feature is in

operation or the thermostat is not currently

calling for cool. Wait about 5 minutes for the

compressor lockout to expire. If the system

isstillnotrunning,readthecautionarystate-

ment below. Then, if conditions permit,

6. The display is flashing BATTERY. What

does this mean?

The “AA” batteries installed in the thermo-

stat are low and should be replaced with

use the

button to move the tempera-

programperiod.SeeOPERATINGYOUR

THERMOSTAT.

ture below the setpoint temperature. See

OPERATING YOUR THERMOSTAT.

•

You have programmed the incorrect day

or time. Check your programming (be

sure that the times you programmed are

correct AM or PM times). See PRO-

GRAMMING YOUR THERMOSTAT.

CAUTION

If the outside temperature is below 50°F,

DO NOT use the button to move the

temperaturebelowthesetpointtempera-

ture. Property damage may result due to

compressor slugging.

•

The thermostat is in the HOLD mode.

RUN

Press

tostartprogramoperation.See

PRGM

OPERATING YOUR THERMOSTAT.

9. Why doesn’t the temperature change at

the time I programmed?

The compressor lockout feature is oper-

ating; wait about 5 minutes for system to

begin running. See OPERATING YOUR

THERMOSTAT.

There may be a number of causes for this

situation. The following are primary reasons.

•

The EMR function is operating. The EMR

functionwillbringonthesystemautomati-

cally to bring the temperature to the se-

lected level by the beginning of the next

10. Why does the blower fan keep running 12. Between heating and cooling seasons, I

after the system has turned off?

want to turn my system off. Can I do this

withoutaffectingmythermostatprogram-

ming?

•

You have programmed the fan to run

continuouslyduringthisperiod.SeePRO-

GRAMMING YOUR THERMOSTAT.

Any time you wish to turn your system off,

SYSTEM

SWITCH

•

The blower delay feature is operating.

This energy saving feature continues to

blow conditioned air through the ducts

after the system has turned off, rather

than letting the air dissipate.

simplypress

untilthedisplayshows

OFF. This will not affect your thermostat’s

programming in any way. To turn the sys-

SYSTEM

tem back on, press

until HEAT,

SWITCH

11. Why is the system turning on and off so

frequently (seldom)?

COOL, etc. is displayed. The system will

automatically begin operating according to

the current thermostat program, unless the

thermostat is in the HOLD mode. See OP-

ERATING YOUR THERMOSTAT.

The anticipation setting is too low (high). To

change anticipation settings, see OPER-

ATING YOUR THERMOSTAT.

13. I live in an area where daylight savings

time is observed. How do I change the

thermostat clock twice a year without

affecting thermostat programming?

To change your clock, follow the instruc-

tions for setting current time and day. See

ENTERING YOUR PROGRAM. Thermo-

stat programming is not affected when you

change the clock.

If you remove the old batteries and install

fresh ones within one minute, you should

not lose your thermostat programming. Af-

terinstallingnewbatteries, followtheproce-

dures in CHECK YOUR PROGRAMMING

to determine whether your programming

wasmaintained. Ifthethermostatmaintains

SYSTEM

14. Do I have to reprogram my thermostat

after I change the batteries?

When the thermostat is on the wall and the

system has power, the thermostat is being

lost, or if the thermostat is removed from the

wall, the program will be retained for ap-

proximately one minute if there are no

batteriesinstalledoriftheinstalledbatteries

are dead. If you are changing the batteries

after seeing a flashing BATTERY on the

display, theinstalledbatteriesmaybedead.

programming, press

until OFF is

SWITCH

displayed, put the thermostat back on the

SYSTEM

SWITCH

wall, press

to select the operating

RUN

mode you want, then press

to start

PRGM

program operation. If the program is lost,

reprogramthethermostat.SeePROGRAM-

MING YOUR THERMOSTAT.