T8602D Chronotherm® IV

Programmable Thermostats

INSTALLATION INSTRUCTIONS

APPLICATION

The T8602 Chronotherm® IV Programmable Thermostat provides electronic control of 24 Vac single-stage heating and cooling systems or 750 mV heating and 750 mV cooling. Refer to Table 1 for a general description of the thermostat. All T8602 Thermostats are powered by batteries.

T8602

D

System

Heat-Cool

Changeover

Manual or

Automatic

Selectable

Table 1. Description of T8602 Thermostats.

System

Selection

Heat-Off-Cool or

Heat-Off-Cool-Auto

Fan

Selection Comments

On-Auto System and fan selections are done by keyboard.

MERCURY NOTICE

If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly.

Contact your local waste management authority for instructions regarding recycling and the proper disposal of the old control.

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow the instructions can damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After completing installation, use these instructions to check out the product operation.

Location

Install the thermostat about 1.5m (5 ft) above the floor in an area with good air circulation at average temperature.

See Fig. 1.

Do not install the thermostat where it can be affected by:

— drafts, or dead spots behind doors and in corners.

— hot or cold air from ducts.

— radiant heat from sun or appliances.

— concealed pipes and chimneys.

— unheated (uncooled) areas such as an outside wall behind the thermostat.

Wallplate Installation

The thermostat can be mounted horizontally on the wall or on a 50.8 mm x 101.6 mm (2 in. x 4 in.) wiring box.

Position wallplate horizontally on the wall or on a

50.8 mm x 101.6 mm (2 in. x 4 in.) wiring box.

1. Position and level the wallplate (for appearance only). The thermostat will function properly even when not level.

2. Use a pencil to mark the mounting holes. See Fig.

2.

3. Remove the wallplate from the wall and drill two

4.76 mm (3/16 in.) holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 5.56 mm (7/32 in.) holes. Gently tap anchors

(provided) into the drilled holes until flush with the wall.

4. Position the wallplate over the holes, pulling wires through the wiring opening.

5. Loosely insert the mounting screws into the holes.

6. Tighten mounting screws.

® U.S. Registered Trademark

Copyright © 2003 Honeywell International Inc. • • All Rights Reserved

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

NO

YES

NO

1.5 METERS

(5 FEET)

NO

M10856

WIRES

THROUGH WALL

WALL

ANCHORS (2)

WIRING

Fig. 2. Mounting the wallplate.

All wiring must comply with local electrical codes and ordinances. Refer to Fig. 3 through 6 for typical hookups.

A letter code is located near each terminal for identification.

CAUTION

Electrical Hazard.

WALL

Fig. 1. Typical location of thermostat.

1. Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 7.

IMPORTANT

Use 18 gauge, color-coded thermostat cable for proper wiring.

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole.

4. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat.

MOUNTING

HOLES

MOUNTING

SCREWS

M15044

Can cause electrical shock or equipment damage.

Disconnect power before wiring.

THERMOSTAT

G W RC

2

Y R OT

3

OT

COMPRESSOR

CONTACTOR

HEAT

RELAY

FAN

RELAY

OUTDOOR

TEMPERATURE

SENSOR

L1

(HOT)

L2

1

1

COOLING

TRANSFORMER

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

L1

(HOT)

L2

HEATING

TRANSFORMER

2 JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A

ONE TRANSFORMER SYSTEM.

3 AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A

SEPARATE CABLE FROM THE THERMOSTAT CABLE.

M10855

Fig. 3. Typical hookup in heat and cool system with two transformers.

69-1510-4 2

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Y G O

THERMOSTAT

B W R RC OT

3

OT

COMPRESSOR

CONTACTOR

COOL

DAMPER

2

HEAT

RELAY

OUTDOOR

TEMPERATURE

SENSOR

FAN

RELAY

HEAT

DAMPER

2

1

1

TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

L1

(HOT)

L2

2 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT

PUMP SYSTEMS.

3 AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A

SEPARATE CABLE FROM THE THERMOSTAT CABLE.

M10347A

Fig. 4. Typical hookup in heat and cool system with one transformer.

PILOTSTAT

CONTROL

(IF USED)

MILLIVOLT HEATING-24Vac

COOLING WALLPLATE

W G R RC Y O

TH

TH/

PP

PP

LIMIT

CONTROL

CHANGEOVER

RELAY

MILLIVOLTAGE

GENERATOR

MILLIVOLTAGE

GAS CONTROL

FAN

RELAY

COOLING

CONTACTOR

L1

(HOT)

L2

1

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

M2942

Fig. 6. Typical hookup in millvoltage heating and

24 Vac cooling circuit.

FOR WRAPAROUND

INSERTION STRIP

7/16 IN. (11 MM).

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 MM).

PILOTSTAT

CONTROL

(IF USED)

MILLIVOLT HEATING-ONLY

WALLPLATE

W R

TH

TH/

PP

LIMIT

CONTROL

PP MILLIVOLTAGE

GAS CONTROL

MILLIVOLTAGE

GENERATOR

M2931

Fig. 5. Typical hookup in millivoltage heating circuit.

M4826

Fig. 7. Correct wiring technique.

Mounting Thermostat

1. Engage tabs at the top of the thermostat and wallplate. See Fig. 7.

2. Press lower edge of case to close and latch.

NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermostat; remove top last.

A.

ENGAGE TABS

AT TOP OF

THERMOSTAT

AND WALLPLATE.

3

B.

PRESS LOWER

EDGE OF CASE

TO LATCH.

M14628

Fig. 8. Mounting thermostat on wallplate.

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Using Thermostat Keys

The thermostat keys are used to:

• set current day and time,

• program times and setpoints for heating and cooling,

• temporarily override program temperatures,

• display present setting,

• configure Installer Setup,

• check Self-Test,

• display outdoor temperature (select models),

• set the system operation,

• set the fan operation.

See Fig. 9 for the location of the keys.

INCREASE TIME SETTING

OR SCROLL FORWARD

THROUGH INSTALLER SETUP

AND SYSTEM TEST

SET WAKE TIMES

AND SETPOINTS

SET CURRENT

DAY AND TIME

SET LEAVE TIMES

AND SETPOINTS

SET RETURN TIMES

AND SETPOINTS

RETURN TO

NORMAL

OPERATIONS

ENTER

INDEFINITE

OR TIMED

HOLD MODE

Run

Program

Set Current

Day/Time

Time

Wake

Set Program

Leave Return Sleep

SET CURRENT OR

PROGRAM DAY

CHANGE BETWEEN

DAYLIGHT SAVINGS

AND STANDARD TIME

Hold Temp Day

Daylight

Time

Copy

Heat/Cool

Settings

System Fan

COPY ONE PROGRAMMED

DAY TO ANOTHER DAY

DECREASE TIME SETTING OR

SCROLL BACKWARD THROUGH

INSTALLER SETUP AND SYSTEM TEST

Fig. 9. T8602D key locations and descriptions.

INCREASE TEMPERATURE

SETTING OR SCROLL

FORWARD THROUGH

INSTALLER SETUP OPTIONS

DECREASE TEMPERATURE

SETTING OR SCROLL

BACKWARD THROUGH

INSTALLER SETUP OPTIONS

DISPLAY INFORMATION

SUCH AS PRESENT

SETTINGS AND OUTDOOR

TEMPERATURE

SET SLEEP TIMES

AND SETPOINTS

SELECT FAN

OPERATION

SELECT SYSTEM

OPERATION

CHANGE BETWEEN

HEATING AND COOLING

SETPOINTS

M14624

SETTINGS

System and Fan Settings

The System default setting is Heat and the Fan default setting is Auto. Use the System and Fan keys to change the settings. See Fig. 10. The fan settings can be set for each program period individually. The system selection is for all the program periods.

System settings control the thermostat operation as follows:

Heat: The thermostat controls the heating.

Off: Both the heating and cooling are off.

Cool: The thermostat controls the cooling.

Auto: The thermostat automatically changes between heating and cooling operation, depending on the indoor temperature.

Fan settings control the system fan as follows:

On: Fan operates continuously.

Auto: Fan operates with equipment.

Time

Run

Program

Hold Temp

Set Current

Day/Time

Day

Daylight

Time

Copy

Wake

Heat/Cool

Settings

Set Program

Leave Return

System

Sleep

Fan

System

Fan

M14625

Fig. 10. Thermostat System and Fan key locations.

NOTE: Always press the keys with your fingertip or similar blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard.

69-1510-4 4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Temperature Settings

Refer to Table 2 for the default program settings. If the daytime energy savings period is not used, press the period key (Leave or Return) until the time is blank. The fan setting feature is available on select thermostat models. See Owner’s Guide, form 69-0940, for complete instructions on changing the program.

Wait Set Program Set Day/Time Temporary Setting

Recovery

Hold for

AM

Filter Em Ht Aux Ht

PM

Days

Mon Tue Wed Thu Fri Sat Sun

Wake Leave Return Sleep

Repl Batt

DST

Room Outdoor

Heat Cool

System

Em Heat

Off

Cool

Auto

Fan

On

Auto

M14559 Table 2. Default Program Settings.

Period

Wake

Leave

Time

6:45 AM

8:45 AM

Heat

Setpoint

20°C

4.5°C

Return 5:00 PM

Sleep 10:00 PM

20°C

4.5°C

Cool

Setpoint

25°C

37°C

25°C

37°C

Fan

Setting

Auto

Auto

Auto

Auto

Fig. 11. Display of all LCD segments.

INSTALLER SETUP

NOTE: For most applications, the thermostat factorysettings do not require changing. Review the factory settings in Table 2 and, if no changes are necessary, go to Installer Self-Test section.

The Installer Setup is used to customize the thermostat to specific systems. Some of the options include temperature display, system changeover and outdoor temperature display. Installer Setup numbers are listed in

Table 3. The table includes all the configuration options and the factory-settings for the T8602.

A combination of key presses is required to use the

Installer Setup feature.

— To enter the installer setup, press and hold the information i key with the increase and decrease keys until the first number is displayed.

All display segments appear for approximately three seconds before the number is displayed. See Fig. 11 and 12.

— To advance to the next Installer Setup, press the Time

∆ key.

— To change a setting, use the increase or decrease key.

— To scroll the Installer Setup numbers backward, press the Time ∇ key.

— To exit the Installer Setup, press Run Program.

INSTALLER SETUP

NUMBER DISPLAY

(COLUMN 2 OF TABLE 3)

FACTORY SETTING OR OTHER

CHOICE DISPLAY (COLUMN 3

OR 5 OF TABLE 3)

M14618

Fig. 12. Display of Installer Setup number and setting.

CAUTION

Electric Heat Configuration Hazard.

Can cause equipment damage.

Configure electric heat system to 1 in Installer

Setup number 2 to prevent system running without fan.

IMPORTANT

Only configured numbers are shown on the device. Example: If thermostat does not have a

System key, Installer Setup Number 12 will not be displayed. Review Table 3 factory settings and mark any desired changes in the Actual

Setting column. When Installer Setup is complete, review the settings to confirm that they match the system.

5 69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Select

Not Used.

Fan operation.

Not Used.

Heating cycle rate.

Not Used.

System setting adjustment

Adaptive

Intelligent

Recovery™ control.

Not Used.

Clock format.

Not Used.

Outdoor temperature display

(select models).

Not Used.

Minimum off time for the compressor.

Temperature range stops in heating.

Temperature range stops in cooling.

Not Used.

Installer Setup

Number (Press

Time ∆ key to change)

1

2

(Number 2 must be set to 1 to extend fan operation.)

3

4

5 thru 11

12

Table 3. Thermostat Installer Setup Options.

Factory Setting

Display

—

0

—

6

—

1

Description

—

Conventional applications where equipment controls fan operation in heat mode.

—

6—6 cph used for conventional heat.

—

Manual changeover

Other Choices

(Press or key to change)

Display Description

—

1

—

Heat pump or electric heat applications where thermostat controls fan operation in heat mode.

9

—

1, 3, or

—

0 or 2

—

1—1 cph used for radiant

floor heat, gravity system.

3—3 cph used for hot water systems or high efficiency furnaces.

9—9 cph used for electric heat systems.

—

0—Auto changeover

2—Auto only

13

14 thru 15

16

17 thru 23

24

25 thru 32

33

34

35

36

1

—

0

—

0

—

5

32.0

7.0

—

Conventional recovery

(system starts recovery at programmed time).

—

12-hour clock format.

—

No outdoor temperature is displayed.

—

5 minute minimum off time for the compressor.

Highest setting for heating setpoint.

Lowest setting for cooling setpoint.

—

—

1

—

1

—

Adaptive Intelligent

Recovery™ control is activated (system starts early so setpoint is reached by start of program period).

—

24-hour clock format.

—

Outdoor temperature is displayed. Needs a

C7089B1000 Outdoor

Temperature Sensor to operate.

—

0 thru 4 Minimum number of minutes (0 thru 5) the compressor will be off between calls for the compressor.

4.5 to

31.5

7.5 to

37.0

—

Temperature range (0.5°C increments) of heating setpoint settings.

Temperature range (0.5°C increments) of cooling setpoint settings.

—

Actual

Setting

—

—

—

—

—

—

—

—

69-1510-4 6

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Select

Temperature display adjustment.

Furnace Air

Filter Timer.

Humidifier

Pad Monitor.

Ultraviolet

(UV) Air

Treatment

System Lamp

Monitor.

Table 3. Thermostat Installer Setup Options. (Continued)

Installer Setup

Number (Press

Time ∆ key to change)

37 0

Factory Setting

Display Description

No difference in displayed temperature and actual room temperature.

43

44

45

0

0

0

Off

Off

Off

1, 2, 3,

4

Other Choices

(Press or key to change)

Display

1.5 thru

-1.5

1, 2, 3

1

Description

.5—Display adjusts to

0.5°C higher than actual room temperature.

1.0—Display adjusts to

1.0°C higher than actual room temperature.

1.5—Display adjusts to

1.5°C higher than actual room temperature.

-.5—Display adjusts to -

.5°C lower than actual room temperature.

-1.0—Display adjusts to -

1.0°C lower than actual room temperature.

-1.5—Display adjusts to -

1.5°C lower than actual room temperature.

1 – 10 days

2 – 30 days

3 – 60 days

4 – 120 days

(Time counted when heat, cool or fan is running.)

1 – 90 days

2 – 180 days

3 – 365 days

(Time counted by calendar days in heat mode.)

1 – 365 days

(Times counted by calendar days in any mode.)

Actual

Setting

IMPORTANT

Review the settings to confirm that they match the system. Press Run Program to exit the

Installer Setup. The thermostat has saved the

Installer Setup changes and initiated a reset in order to operate using the new settings. Be sure to set the current day and time immediately.

7 69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Setting Current Day and Time

1. Press Set Current Day/Time.

NOTE: On initial powerup or after an extended power loss, 1:00 pm flashes on the display until a key is pressed.

INSTALLER SYSTEM TEST

Use the Installer System Test to check the thermostat operation. Refer to Table 4 for a list of the available system tests.

Set Current

Day/Time

Run

Program

Hold Temp

Set Current

Day/Time

Day

Time

Wake

Set Program

Leave Return Sleep

Heat/Cool

Settings

System Fan

Daylight

Time

Copy

Mon

Set Day/Time

PM

2. Press Day until the current day is displayed.

NOTE: Sun=Sunday, Mon=Monday,

Tue=Tuesday, Wed=Wednesday,

Thu=Thursday, Fri=Friday, Sat=Saturday.

M14619

CAUTION

Equipment Damage Hazard.

Minimum compressor off-time is bypassed during Installer System Test.

Avoid cycling compressor quickly.

To start the system test:

Press and hold the increase and decrease keys at the same time until 10 appears. All segments of the display will be displayed before the 10 appears.

See Fig. 13 and 14.

Set Day/Time

Tue

PM

Day

Run

Program

Set Current

Day/Time

Time

Wake

Set Program

Leave Return Sleep

Heat/Cool

Settings

System Fan Hold Temp Day

Daylight

Time

Copy

M14620

3. Press Time ∆ or Time ∇ until the current time is displayed.

NOTE: Tapping the Set Current Day/Time changes the time in one hour increments.

Time

Set Day/Time

AM

Run

Program

Hold Temp

Set Current

Day/Time

Day

Time

Wake

Set Program

Leave Return Sleep

Heat/Cool

Settings

System Fan

Daylight

Time

Copy

Tue

M14621

NOTE: If the current time is Daylight Savings Time, press Daylight Time until DST is displayed.

Table 4. Tests Available In Installer System Test.

Test

Number

10-19

30-39

40-49

60 0 to

60 19

70-79

System Test Description

Heating equipment can be turned on and off.

Cooling equipment can be turned on and off.

Fan equipment can be turned on and off.

Keyboard keys test.

Thermostat information, including date code and software versions, is displayed.

Daylight

Time

Run

Program

Set Current

Day/Time

Hold Temp Day

Daylight

Time

Time

Wake

Heat/Cool

Settings

Set Program

Leave Return

System

Sleep

Fan

Copy

4. Press Run Program.

Tue

Set Day/Time

AM

DST

M14622

Wait Set Program Set Day/Time Temporary Setting

Recovery

Hold for

AM

Filter

Mon

Em Ht Aux Ht

PM

Days

Tue Wed Thu Fri Sat Sun

Wake Leave Return Sleep

Repl Batt

DST

Room Outdoor

Heat Cool

System

Em Heat

Off

Cool

Auto

Fan

On

Auto

M14559

Fig. 13. Display of all LCD segments.

Run

Program

Run

Program

Set Current

Day/Time

Time

Wake

Set Program

Leave Return Sleep

Heat/Cool

Settings

System Fan Hold Temp Day

Daylight

Time

Copy

Wake

Tue

69-1510-4

AM

DST

Room

System

Heat

Fan

Auto

M14623

8

M14612

Fig. 14. Display of test number.

Refer to Table 5 for the directions and results of the specific tests.

NOTE: Press Time ∆ to advance to the next test and

Time ∇ to go back to the previous test. Press

Run Program to exit the System Test

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Table 5. Installer System Test Options.

Keys to

Press

Test

Number

Heating Equipment System Test

Time ∆ 10 Enter heating equipment system test.

11

Description

Heat comes on. When Installer Setup number 2 is 1, the system fan is also energized.

10 Heat and system fan turn off.

Cooling Equipment System Test

Time ∆ 30 Change from heating to cooling equipment system test.

31

30

Cool and system fan come on.

Cool and system fan turn off.

Fan Equipment System Test

Time ∆ 40

41

Change from cooling to fan equipment system test.

Fan comes on.

40 Fan turns off.

Key Operation System Test

Time ∆ 60 2 Change from fan to key operation system test.

NOTE: Press any key and the displayed numbers will change. Press Time ∇ to go to the previous test and Time ∆ to go to the next test. The Run Program key does not exit this test. Press Time ∆ or Time ∇ and then the Run

Program key to exit.

9 69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

THERMOSTAT INFORMATION

1. Press the Time ∆ key to access the thermostat information.

4. Press the increase key again to display the software revision number.

(Example: 001 = Revision number 1).

M14613

2. Press the increase key to display the production date code. The first two large digits are the month and the third digit is the last digit of the year.

(Example: 027 = February 1997).

M14616

5. Press the increase key again to display the

EEPROM identification code.

(Example: 314 = EEPROM ID 314).

M14614

3. Press the increase key again to display the software identification code.

(Example: 02 = software ID code 2).

M14617

6. Press the Run Program key to exit the system test.

The system test times out after four minutes without any key presses.

CHECKOUT

Outdoor Temperature Sensor

(Select Models)

Allow the outdoor temperature sensor to absorb the outdoor air for a minimum of five minutes before taking a reading.

M14615

69-1510-4 10

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

TROUBLESHOOTING GUIDE

Symptom

Display will not come on.

Temperature display is incorrect.

Temperature settings will not change. (Example:

Cannot set the heating higher or the cooling lower.)

Heating will not come on.

Table 6. Troubleshooting Guide.

Possible Cause

Thermostat is not being powered.

Action

• Check if batteries are present and installed correctly.

— If batteries are present and installed correctly, replace thermostat.

Enter Installer Setup number 37 and reconfigure the display.

Room temperature display has been reconfigured.

Thermostat is configured for °F or °C display.

Bad thermostat location.

Enter Installer Setup number 14 and reconfigure the display.

Relocate the thermostat.

The upper or lower temperature limits were reached.

Check the temperature setpoint:

• Heating limits are 4.5 to 32°C

• Cooling limits are 7 to 37°C

The setpoint temperature range stops were configured.

Check Installer Setup numbers 34 and 35 and reconfigure the setpoint stops.

Cooling will not come on.

Heating or cooling come on momentarily and shut off.

No power to the thermostat.

System selection is not set to

Cool.

Cool setpoint is above room temperature.

Heat or cool circuit is opening up or becoming high impedance.

• Check for 24 Vac between R and W terminals (check for

750 mV on PowerPile ® Systems).

— If missing 24 Vac:

— check if the circuit breaker is tripped—reset the circuit breaker.

— check if the system fuse is blown—replace the fuse.

— check if the power switch on the HVAC equipment is in the Off position—set to the On position.

— check wiring between thermostat and HVAC equipment—replace any broken wires and tighten any loose connections.

— If 24 Vac is present, proceed with troubleshooting.

Wait up to five minutes for the system to respond.

Thermostat minimum off time is activated.

System selection is not set to

Heat.

Heating setpoint is below room temperature.

No power to the thermostat.

Thermostat minimum off time is activated.

Set system selection to Heat.

Check heating setpoint. Set heating setpoint to desired temperature.

• Check for 24 Vac between R or RC and Y terminals

— If missing 24 Vac:

— check if the circuit breaker is tripped—reset the circuit breaker.

— check if the system fuse is blown—replace the fuse.

— check if the power switch on the HVAC equipment is in the Off position—set to the On position.

— check wiring between thermostat and HVAC equipment—replace any broken wires and tighten any loose connections.

— If 24 Vac is present, proceed with troubleshooting.

• Wait up to five minutes for the system to respond.

• Enter Installer Setup number 33. Reconfigure minimum off time (if required).

Set system selection to Cool.

Check cooling setpoint. Set cooling setpoint to desired temperature.

Add resistor in parallel with load or install interface relay.

11 69-1510-4

Table 6. Troubleshooting Guide. (Continued)

Symptom Possible Cause Action

System on indicator

(flame=heat, snowflake=cool) is displayed, but no warm or cool air is coming from the registers.

Fan operation set for 0 (conventional heat) when it should be set for 1 (electric heat).

Conventional heating equipment turns on the fan when the furnace has warmed up to a setpoint.

Enter Installer Setup number 2 and reconfigure the fan operation.

Wait a minute after seeing the on indicator and then check the registers.

Outdoor temperature not displayed a

Outdoor temperature display is incorrect a

Heating or cooling equipment is not operating.

Option not activated.

Verify operation of heating or cooling equipment in self-test.

Enter Installer Setup number 24 and set to 1. Thermostat must have OT terminals and a C7089B1000 Sensor installed.

Outdoor sensor is connected incorrectly.

Wrong sensor.

Refer to C7089B1000 Installation Instructions and check wiring between the thermostat and sensor.

Replace sensor with C7089B1000 Sensor.

a Select models.

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Scarborough, Ontario

M1V 4Z9

69-1510-4 G.H. Rev. 03-03

Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.

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