OPERATION GUIDE

5 Day/2 Day Electronic

Digital Thermostat

WHITE-RODGERS

1F90-71

Operator: Save this booklet for future use!

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.

2

In This Guide . . .

YOUR NEW THERMOSTAT’S

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

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

PARTS OF THE THERMOSTAT

The Back Of the Thermostat Body

The Display

The Thermostat Buttons

OPERATING FEATURES

PROGRAMMING YOUR

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

PLANNING FOR YOUR NEEDS

ENTERING YOUR PROGRAM

Set Current Time and Day

Enter Heating Program

Enter Cooling Program

CHECK YOUR PROGRAMMING

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

Operator: Save this booklet for future use!

3

4

YOUR NEW THERMOSTAT’S FEATURES

• Separate 5-day (weekday) and 2-day (weekend) setback programming

• Simultaneous heat and cool program storage

• Four separate time/temperature settings per

24-hour period

• Computed Energy Management Recovery

(EMR)

• Automatic changeover (operator-selectable)

• Armchair programming capability

• Backlit LCD displays continuous set point, time, and room temperature

• 1.5 volt “AA” Energizer

®

alkaline battery backup

• Preprogrammed temperature control

• Adjustable cycle times

• Compressor short cycle protection

• Programmable blower control

• Blower delay in the cooling cycle

• Audio and visual prompting during operation

• Two hour temperature override

• Manual program override (HOLD temperature)

• “Advance Program” key

•

°

F/

°

C convertibility

• Keypad lockout and limited temperature range (operator-selectable)

• Temperature range 40

°

to 99

°

F

• Compatible with Remote Sensor (installerselectable)

OPERATING YOUR THERMOSTAT

Before you begin programming your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. The information in this section will help you become familiar with your new thermostat so that you can easily program it.

Your thermostat consists of two parts: the

thermostat body and the subbase.

!

CAUTION

Remove power from the system at the circuit breaker/fuse box before removing or attaching the thermostat body.

Equipment damage and/or personal injury could occur.

The subbase is attached to the wall, but you can remove the thermostat body for easy programming. To remove the thermostat body from the subbase, grasp the thermostat body and gently pull it straight out from the subbase. To attach the thermostat body, line up the three terminal 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.

5

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 and the two option switch groups (A and B).

1.

The “AA” Energizer ® alkaline batteries provide power to the thermostat when the

24 VAC power 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 thermostat will automatically return to the factory programmed temperatures (64

°

F heating and 82

°

F cooling) when power is restored. You must reprogram the thermostat if this happens.

6

If the word BATTERY is flashing in the display window, the batteries are low and should be replaced with fresh “AA” Energizer ® alkaline batteries.

!

CAUTION

Use

SYSTEM

SWITCH

to turn the thermostat OFF before removing the thermostat from the wall to replace batteries.

2.

You may adjust the option switches for keypad lockout, limited temperature range, and automatic changeover from heat to cool

(see OPERATING FEATURES).

Other than and , the buttons are located behind the thermostat door. To open the door, put your fingernail in the indentation at the top of the door, then pull the door out from the top and swing it down on its hinges.

On the following pages there are brief descriptions of the display and the thermostat buttons.

6-pin connector

Batteries

(Group A)

(Group B)

Option switches

3-pin Connector

BACK OF THERMOSTAT BODY

7

8

The Display

1 Continuously displays system mode (HEAT,

OFF, COOL, AUTO, HOLD). During programming, the program period is displayed

(MOR, DAY, EVE, or NHT).

2 Alternately displays room temperature (F denotes degrees Fahrenheit and C denotes degrees Celsius) and time of day (A denotes AM time and P denotes PM time).

3 Displays the setpoint temperature.

4 5 DAY indicates that the displayed program is the weekday program. 2 DAY indicates that the displayed program is the weekend program.

5 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-flashing) when thermostat is running on battery power only.

6 FAN ON is displayed when the blower is operating continuously. FAN AUTO is displayed during automatic fan operation (when the blower cycles with the heating or cooling system).

5 DAY FAN AUTO

1

WHITE-RODGERS

SYSTEM

SWITCH

HEAT-OFF-COOL-AUTO

FAN

SWITCH

ON-AUTO

2 3

TIME

FWD

DIGITAL COMFORT SET II

SET

CLOCK

VIEW

PRGM

HOLD

TEMP

TIME

BACK

SET

DAY

RUN

PRGM

ADV

PRGM

3

2 DAY FAN AUTO

4 6 4

5 DAY FAN ON

6 2

BATTERY

5

9

The Thermostat Buttons

7 Sets the system mode (HEATing, OFF,

COOLing, or AUTOmatic changeover).

8 Selects fan operation (see #6, above). This button is also used to program the fan to run continuously during a program period.

9 Runs display forward or backward through time, day, or anticipation settings during programming.

10 Used with

TIME

FWD

and TIME

BACK

to set current time and day of the week.

11 Used during programming to set the day of the week to be programmed. Also used in conjunction with SET

CLOCK

to enter anticipation setting mode.

10

12 Used to initiate or review thermostat programming.

13 Used to start program operation after programming. Also used to return thermostat to program operation after being in HOLD mode.

14 Used to manually override programming to hold at a selected temperature (when HOLD is displayed).

15 Used to advance thermostat program to the next program period (for example, from the

MOR program to the DAY program).

16 (Red arrow) Raises temperature setting

(99

°

F or 37

°

C maximum).

17 (Blue arrow) Lowers temperature setting

(40

°

F or 4

°

C minimum).

18 The red indicator light glows whenever heating, cooling, or fan are in operation.

17 16 18

7

8

5 DAY FAN AUTO

WHITE-RODGERS

SYSTEM

SWITCH

HEAT-OFF-COOL-AUTO

FAN

SWITCH

ON-AUTO

TIME

FWD

DIGITAL COMFORT SET II

SET

CLOCK

VIEW

PRGM

HOLD

TEMP

TIME

BACK

SET

DAY

RUN

PRGM

ADV

PRGM

9 10 11 12 13 14 15

11

OPERATING FEATURES

Now that you are familiar with the thermostat display and buttons, read the following information 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 heating or cooling system to change the temperature so that the desired temperature is reached at the beginning of the next program 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

12 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.

This feature is controlled by Group B option switch #3. To enable the EMR function, first you must move option switch #3 (located on the back of the thermostat body) to the OFF position, if it has not already 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 #3 (the last switch on the right). If it is OFF (down), simply put the thermostat back on the wall and restore 24 VAC power. If the switch is

ON (up), remove the battery, then use a pencil or small screwdriver to move the

switch to the OFF position (see figure below). Leave the battery out of the thermostat for at least two minutes, to allow the thermostat to reset itself. See AUTOMATIC

CHANGEOVER to determine proper positions of Group B option switches #1 and #2.

EMR (ON)

ON

Group B

Option

Switches

1 2 3

Switch #1 (see AUTOMATIC CHANGEOVER)

Switch #2 (see AUTOMATIC CHANGEOVER)

Switch #3 OFF

• AUTOMATIC CHANGEOVER — If you have a heating/cooling system, you can set the thermostat to automatically switch the system from heating to cooling as needed. (If you have a heating only system, Group B option switch #1 should be OFF and option switch #2 should be ON.) To enable automatic changeover, you must move Group B option switch #1 to the ON position and switch #2 to the OFF position. Turn off 24

VAC power to the thermostat. Then remove the thermostat body from the wall. Check the position of Group B option switches #1 and #2 (the first two switches on the left). If they are in the correct positions, simply put the thermostat back on the wall and restore

24 VAC power. If the switches are not correctly positioned, remove the battery, then use a pencil or small screwdriver to move the switches to the correct positions (see figure on next page). Leave the battery out of the thermostat for at least two minutes, to allow the thermostat to reset itself. Replace the battery, reprogram the thermo-

13

14 stat, if necessary, put the thermostat back on the wall, and restore 24 VAC power. To set the thermostat for automatic changeover after programming, press

SYSTEM

SWITCH

to set the thermostat to AUTO (the setpoint temperature display is blank in the AUTO mode).

The system will now automatically switch between heating and cooling, depending on the actual room temperature.

Automatic Changeover

ON

Group B

Option

Switches

1 2 3

Switch #1 ON

Switch #2 OFF

Switch #3 (see Energy Management Recovery)

NOTE

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).

79

78

77

76

75

74

73

COOLING TEMPERATURES

DEAD BAND 1

°

F

HEATING TEMPERATURES

For manual changeover, Group B option switches #1 and #2 should be in the OFF position.

• TWO HOUR TEMPERATURE OVER-

RIDE — Press or until the display shows the temperature you want. The

thermostat will override current programming 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 the program. Press HOLD

TEMP

. HOLD will be displayed. Then choose the desired hold temperature by pressing or . The thermostat will hold the room temperature at the selected setting until you press

RUN

PRGM

to start program operation again. This feature is ideal for energy conservation when the building is unoccupied for an extended period of time.

• “ADVANCE PROGRAM” KEY — Press

ADV

PRGM

to change the thermostat to the next program period. This will temporarily override the program, until the next program period begins (for example, pressing this key while in the DAY program will advance the thermostat to the EVE program, which will remain in effect until the NHT program begins).

•

°

F/

°

C CONVERTIBILITY — Press

TIME

FWD

and

TIME

BACK

at the same time until the temperature display is in

°

C (Celsius). To display

°

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

15

(long cycles), you may want to adjust the anticipation setting.

!

CAUTION

A cooling anticipation setting of less than

10 may cause decreased compressor life.

16

To adjust heat anticipation, press SET

CLOCK

and

SET

DAY

at the same time. The display will show

HEAT 5 (this is the factory preprogrammed heating anticipation setting). You may select any anticipation setting from 2 to 40

(note that for hydronic systems, a mini-

mum anticipation setting of 15 is recom-

mended). 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. If the heat cycles are too short, press TIME

FWD

to increase the cycle time. If the heat cycles are too long, press TIME

BACK

to decrease the cycle time. To set cooling antici-

SET pation, press

CLOCK

and

SET

DAY

at the same time again. The display will show COOL 14 (factory preprogrammed cooling anticipation).

You may select any anticipation setting from

4 to 40. Use TIME

FWD

and TIME

BACK

to adjust anticipation. Press

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 displayed continuously (non-flashing) when

24 VAC power is not being supplied to the thermostat and the thermostat is operating on battery power only.

• AUDIO PROMPTING — Each time you press a button, the thermostat will beep.

• BACKLIT DISPLAY — When you press any button on the thermostat, the display is lit for approximately eight seconds.

• SYSTEM INDICATOR LIGHT — The red light on the upper right part of the thermostat indicates system operation (see PARTS OF

THE THERMOSTAT).

• COMPRESSOR SHORT CYCLE PROTEC-

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: a) Return of power after a power outage.

b) Pressing

SYSTEM

SWITCH

to change operating modes.

c) Pressing , creating a call for COOL too soon after a previous call.

• TOTAL KEYPAD LOCKOUT — When Group

A option switch #1 is in the total keypad lockout position (ON), programs cannot be altered and all buttons are disabled (see next page for illustration).

NOTE

Programming should be completed and batteries should be installed before changing Group

A option switches #1 or #2.

17

Total Keypad Lockout

Switch #1 ON

Switch #2 OFF

ON

Group A

Option

Switches

1 2

18

To enable total keypad lockout, move Group

A option switch #1 to ON (see figure above).

To disable total keypad lockout, move option switch #1 to OFF.

• LIMITED TEMPERATURE RANGE —

When Group A option switch #1 is in the

OFF position and option switch #2 is in the

ON position, the heating and cooling temperatures may be changed using the and buttons, but the temperatures may not be set to exceed any programmed maximum heating or minimum cooling temperatures. When this option is set, the following buttons are disabled:

SET

DAY

HOLD

TEMP

ADV

PRGM

NOTE

Programming should be completed and batteries should be installed before changing Group

A option switches #1 or #2.

Limited Temperature Range

ON Switch #1 OFF

Switch #2 ON

Group A

Option

Switches

1 2

To enable limited temperature range, move

Group A switch #1 to the OFF position and switch #2 to the ON position (see figure below). To disable limited temperature range, move switch #2 to the OFF position (see

TOTAL KEYPAD LOCKOUT to determine the correct position of option switch #1).

PROGRAMMING YOUR THERMOSTAT

Now you are ready to program your thermostat.

This section will help you plan your thermostat’s program to meet your needs.

For maximum comfort and efficiency, keep the following guidelines in mind when planning your program.

• When heating (cooling) your building, program the temperatures to be cooler (warmer) when the building is vacant or during periods of low activity.

• During early morning hours, the need for cooling is usually minimal.

PLANNING FOR YOUR NEEDS

First, answer the following questions to help you decide what your needs are. If you are using the thermostat for a commercial application (a store, office building, etc.), answer questions 1 through

4. If you are using the thermostat in your home, answer questions 5 through 8.

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.

2a. What time do the building occupants reach a maximum activity level (using lights, equipment, meeting rooms, etc.)?

b. What temperature should the building be at this time? These will be your DAY temperature settings.

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3a. What time do the building occupants reach a minimum activity level (limited personnel in building)?

b. What temperature should the building be at this time? These will be your EVE (evening) temperature settings.

4a. What time does the building become vacant?

b. What temperature should the building be at this time? These will be your NHT (night) temperature 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 (morning) temperature settings.

6a. What time does the last person leave the house in the morning?

b. What temperature should the house be at this time? These will be your DAY temperature settings.

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.

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.

20

Now look at the factory preprogrammed times and temperatures shown below. If this program will suit your needs, simply press RUN

PRGM

to begin running the factory preset program.

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 at right).

79

78

77

76

75

74

73

COOLING TEMPERATURES

DEAD BAND 1

°

F

HEATING TEMPERATURES

Determine the time periods and heating and cooling temperatures for your weekday program. You must program 4 periods for each day

(MOR, DAY, EVE, and NHT). However, you may use the same heating and cooling temperatures for consecutive time periods. You can choose start times, heating temperatures, and cooling temperatures independently for both

Heating Program for ALL days of the Week:

PERIOD

MOR

DAY

EVE

NHT

TIME

5:00 AM

9:00 AM

4:00 PM

10:00 PM

FACTORY PREPROGRAMMING

TEMP

70

70

70

64

Cooling Program for ALL Days of the Week:

PERIOD

MOR

DAY

EVE

NHT

TIME

5:00 AM

9:00 AM

4:00 PM

10:00 PM

TEMP

78

82

78

78

21

weekday and weekend programs (for example, you may select 5:00 AM and 70

°

as the weekday

MOR heating start time and temperature, and choose 7:00 AM and 76

°

as the weekday MOR

cooling start time and temperature). Use the following table to plan your program time periods, and the temperatures you want during each period. You may also want to look at the sample program table to get an idea of how the thermostat can be programmed.

ENTERING YOUR PROGRAM

Follow these steps to enter the heating and cooling programs you have selected.

NOTE

We recommend that you remove the thermostat from the wall for programming (especially for entering cooling programming). Fresh “AA” En-

22 ergizer ® alkaline batteries must be installed to perform off-wall programming. BE SURE TO

USE

SYSTEM

SWITCH

TO TURN THERMOSTAT OFF

BEFORE REATTACHING THERMOSTAT TO

SUBBASE!

NOTE

You cannot program the thermostat with the

SYSTEM SWITCH in the AUTO position.

Set Current Time and Day

1.

Press SET

CLOCK

once. The display will show minutes only.

EXAMPLE:

2.

Press and hold either TIME

FWD

or TIME

BACK

until you reach the correct minutes.

MOR HEAT

DAY HEAT

EVE HEAT

NHT HEAT

MOR COOL

DAY COOL

EVE COOL

NHT COOL

Heating/Cooling Schedule Plan

WEEKDAY (5 DAY)

Start

Time Temperature

WEEKEND (2 DAY)

Start

Time Temperature

23

24

MOR HEAT

DAY HEAT

EVE HEAT

NHT HEAT

MOR COOL

DAY COOL

EVE COOL

NHT COOL

SAMPLE

Heating/Cooling Schedule Plan

WEEKDAY (5 DAY)

WEEKEND (2 DAY)

Start

Time

Start

Time

5:30 AM

8:00 AM

5:00 PM

10:30 PM

6:30 AM

2:00 PM

5:00 PM

10:30 PM

Temperature

68

°

F

65

°

F

70

°

F

65

°

F

76

°

F

78

°

F

72

°

F

78

°

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

Temperature

68

°

F

70

°

F

70

°

F

65

°

F

76

°

F

74

°

F

72

°

F

78

°

F

3.

Press SET

CLOCK

once. The display window will show the hour only.

EXAMPLE:

4.

Press and hold either

5.

noon).

Press SET

DAY

TIME

FWD

or TIME

BACK

until you reach the correct hour and AM/PM designation (AM begins at midnight; PM begins at

once. The display will show the day of the week as an abbreviation (MO for

Monday, TU for Tuesday, etc.).

6.

Press and hold either TIME

FWD

or TIME

BACK

until you reach the current day of the week.

7.

Press RUN

PRGM

once. The display will show the correct time and room temperature alternately.

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 alternating time/temperature display. To resume programming after this happens, press VIEW

PRGM

until you are at the point where you stopped programming. Then you may continue to enter your programs normally. If you want to stop programming at any time, simply press RUN

PRGM

to resume program operation.

25

1.

Press

SYSTEM

SWITCH

until HEAT is displayed.

VIEW

2.

Press

PRGM

once. 5 DAY (indicating weekday program), and MOR, representing the morn-

ing heating period, will appear in the display. Also displayed are the currently programmed start time for the MOR period and the currently programmed temperature.

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 temperature (this example reflects factory preprogramming).

3.

To change the displayed start time to your selected start time for weekday MOR heat program, press TIME

FWD

or TIME

BACK

until your selected time appears. The time will change in

15 minute increments.

4.

Press or until you reach your selected weekday MOR heating temperature.

5.

If you want the fan to run continuously during this period, press

FAN is displayed.

FAN

SWITCH

until PRG

VIEW

6.

Press

PRGM

. The currently programmed start 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 weekday DAY program.

26

8.

Repeat steps 3 through 7 for the weekday

EVE and NHT heating programs.

9.

After entering your weekday heating program, 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 heating program, press

RUN

PRGM

.

Enter Cooling Program

!

CAUTION

If outside temperature is below 50

°

F, we recommend that you remove the thermostat from the wall before proceeding with the following steps to program cooling temperatures. Personal injury or property damage may occur due to air conditioner compressor slugging. Fresh

“AA” Energizer

®

alkaline batteries must be installed to perform off-wall programming. Programming away from the wall should prevent accidental compressor operation. USE

SYSTEM

SWITCH

TO TURN THER-

MOSTAT OFF BEFORE REATTACHING

THE THERMOSTAT TO THE SUBBASE!

27

1.

Press

SYSTEM

SWITCH

until COOL appears.

2.

Follow the procedure for entering your heating program, using your selected cooling times and temperatures.

CHECK YOUR PROGRAMMING

Follow these steps to check your thermostat programming one final time before beginning thermostat operation.

1.

Press

SYSTEM

SWITCH

until HEAT is displayed.

2.

Press and hold VIEW

PRGM

to view the heating period times and temperatures in sequence for weekday, then weekend MOR, DAY,

EVE, and NHT program periods.

3.

Press RUN

PRGM

.

4.

Press

SYSTEM

SWITCH

until COOL is displayed.

5.

Repeat step 2 to check cooling temperatures.

6.

Press RUN

PRGM

to begin program operation.

YOUR THERMOSTAT IS NOW COMPLETELY

PROGRAMMED AND READY TO AUTOMATI-

CALLY PROVIDE MAXIMUM COMFORT AND

EFFICIENCY!

Press

SYSTEM

SWITCH

until OFF is displayed. Reattach thermostat to subbase. Turn on power to the system. Then press

SYSTEM

SWITCH

to select the operation mode you want (HEAT, COOL, AUTO).

Press

FAN

SWITCH

until FAN AUTO is displayed

(automatic cycling).

28

QUESTIONS AND ANSWERS

1.

How can I permanently change a part of my program?

VIEW

Press

PRGM

until you reach the time/temperature schedule you want. Then press

TIME

BACK

and and

TIME

FWD

or

to change the program. See PROGRAMMING YOUR

THERMOSTAT.

2.

How can I have no change in temperature from one time period to another?

Simply select the same temperature for each consecutive time period. For example, 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

PROGRAMMING YOUR THERMOSTAT.

3.

How can I finish my programming if the display has already changed to time/ temperature?

During programming, if no buttons are pressed for five minutes, the thermostat will enter the HOLD mode and maintain a constant temperature. The display will change to the time/temperature mode. To resume programming, press VIEW

PRGM

until you return to the point where you stopped programming.

Then you may continue to program the thermostat normally. If you want to stop programming at this point, press RUN

PRGM

to start

29

the normal program function. See PRO-

GRAMMING YOUR THERMOSTAT.

4.

What happens if the electricity goes off or is manually shut off?

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 temperature of 64

°

F and a cooling temperature of 82

°

F until you reenter your program.

Setpoint temperature will not be displayed.

If fresh “AA” Energizer ® alkaline batteries are installed, the program will be maintained for about one year with no 24 VAC power present to the thermostat. See OP-

ERATING YOUR THERMOSTAT.

5.

Why can’t I program the thermostat in the AUTO mode?

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. However, if there is power to the thermostat and the display is blank or frozen, static discharge 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 thermostat. This may cause the program to be lost or the thermostat to display incorrectly.

30

To correct this, remove the thermostat from the wall and disconnect the battery. Wait about one minute, then reconnect the battery. The thermostat will revert to the factory preset program until you reprogram the thermostat. If you don’t want to reprogram the thermostat immediately, press

SYSTEM

SWITCH until OFF is displayed and replace the thermostat on the wall. Then press RUN

PRGM

to begin the factory preset program. Or you may reprogram the thermostat, then replace it on the wall.

To prevent further static discharge problems, touch another object to release static build-up before touching the thermostat.

See OPERATING YOUR THERMOSTAT.

7.

Why won’t the setpoint temperature go 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 example, if 70

°

F is your lowest selected cooling temperature, you cannot select a heating temperature any higher than 68

°

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.

31

8.

The display is flashing BATTERY. What does this mean?

The “AA” batteries installed in the thermostat are low and should be replaced with fresh “AA” Energizer

®

alkaline batteries. See

OPERATING YOUR THERMOSTAT.

9.

The display shows a continuous (nonflashing) BATTERY. What does this mean?

The thermostat is not being supplied with

24 VAC power. The thermostat is operating on battery power alone. See OPERATING

YOUR THERMOSTAT.

10. Why won’t the compressor turn on, even though the thermostat display is functioning normally?

Either the compressor lockout feature is in operation or the thermostat is not currently

32 calling for cool. Wait about 5 minutes for the compressor lockout to expire. If the system is still not running, read the cautionary statement below. Then, if conditions permit, use the button to move the temperature below the setpoint temperature. See

OPERATING YOUR THERMOSTAT.

!

CAUTION

If the outside temperature is below 50

°

F,

DO NOT use the button to move the temperature below the setpoint temperature. Property damage may result due to compressor slugging.

11. Why doesn’t the temperature change at the time I programmed?

There may be a number of causes for this situation. The following are primary reasons.

• The EMR function is operating. The EMR function will automatically bring on the system automatically to bring the temperature to the selected level by the beginning of the next program period. 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.

• The thermostat is in the HOLD mode.

Press

RUN

PRGM

to start program operation. See

OPERATING YOUR THERMOSTAT.

• The compressor lockout feature is operating; wait about 5 minutes for system to begin running. See OPERATING YOUR

THERMOSTAT.

12. Why does the blower fan keep running after the system has turned off?

• You have programmed the fan to run continuously during this period. See PRO-

GRAMMING YOUR THERMOSTAT.

• 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)?

The anticipation setting is too low (high). To change anticipation settings, see OPER-

ATING YOUR THERMOSTAT.

33

14. Between heating and cooling seasons, I want to turn my system off. Can I do this without affecting my thermostat programming?

Any time you wish to turn your system off, simply press

SYSTEM

SWITCH

until the display shows

OFF. This will not affect your thermostat’s programming in any way. To turn the system back on, press

SYSTEM

SWITCH

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.

15. 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 instructions for setting current time and day. See

ENTERING YOUR PROGRAM. Thermostat programming is not affected when you change the clock.

34

16. Do I have to reprogram my thermostat after I change the batteries?

When the thermostat is on the wall and the system has power, the thermostat is being powered by a 24 VAC source. If power is lost, or if the thermostat is removed from the wall, the program will be retained for approximately one minute if there are no batteries installed or if the installed batteries are dead. If you are changing the batteries after seeing a flashing BATTERY on the display, the installed batteries may be dead.

If you remove the old batteries and install fresh ones within one minute, you should not lose your thermostat programming. After installing new batteries, follow the procedures in CHECK YOUR PROGRAMMING to determine whether your programming was maintained. If the thermostat maintains programming, press

SYSTEM

SWITCH

until OFF is displayed, put the thermostat back on the wall, press

SYSTEM

SWITCH

to select the operating mode you want, then press

RUN

PRGM

to start program operation. If the program is lost, reprogram the thermostat. See PROGRAM-

MING YOUR THERMOSTAT.

35

R

If you need further information on programming or operation, write to:

White-Rodgers Division, Emerson Electric Co.

9797 Reavis Road

St. Louis, MO 63123

Attn: Technical Service Department

Part No. 37-5098B

Replaces 37-5098A

9518