Honeywell T8602C Thermostat User Manual

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T8602C Chronotherm IV

Deluxe Programmable

Thermostats

INSTALLATION INSTRUCTIONS

APPLICATION

The T8602 Chronotherm ^®IV Deluxe Programmable Thermostat provides electronic control of 24 Vac single-stage

heating and cooling systems or 750 mV heating system. Refer to Table 1 for a general description of the thermostat. All

T8602 thermostats are powered by batteries.

Table 1. Description of T8602 Thermostats.

Fan

T8602

System

Changeover

System Selection

Selection

Comments

Heat-Cool

Manual

Heat-Off-Cool

On-Auto

System and fan selections are made on

keyboard.

Location

Install the thermostat about 5 ft (1.5m) above the floor in

an area with good air circulation at average temperature.

See Fig. 1.

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.

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.

Contact your local waste management authority

for instructions regarding recycling and the

proper disposal of the old control.

radiant heat from sun or appliances.

concealed pipes and chimneys.

unheated (uncooled) areas such as an outside wall

behind the thermostat.

INSTALLATION

Wallplate Installation

When Installing this Product...

The thermostat can be mounted horizontally on the wall

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

Position wallplate horizontally on the wall or on a

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

Read these instructions carefully. Failure to follow

the instructions can damage the product or cause

a hazardous condition.

Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

Installer must be a trained, experienced service

technician.

After completing installation, use these instructions

to check out the product operation.

U.S. Registered Trademark

9-1670

T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

YES

FEET

[

1.5 METERS]

M10106

Fig. 1. Typical location of thermostat.

Position and level the wallplate (for appearance

only). The thermostat functions correctly even

when not level.

WIRING

All wiring must comply with local electrical codes and

ordinances. Refer to Fig. 3 and 6 for typical hookup. A

letter code is located near each terminal for identification.

Use a pencil to mark the mounting holes.

See Fig. 2.

Remove the wallplate from the wall and drill two

/16 inch (76 mm) holes in the wall (if drywall) as

marked. For firmer material such as plaster, drill

two 7/32 inch (5.56 mm) holes. Gently tap anchors

CAUTION

(

provided) into drilled holes until flush with wall.

Electrical Hazard.

Position the wallplate over the holes, pulling wires

through the wiring opening.

Can cause electric shock or equipment

damage.

Loosely insert the mounting screws into the holes.

Tighten mounting screws.

Disconnect power before wiring.

Loosen the terminal screws on the wallplate and

connect the system wires. See Fig. 7.

WALL

IMPORTANT

WIRES

THROUGH WALL

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.

WALL

ANCHORS (2)

THERMOSTAT

MOUNTING

HOLES

MOUNTING

SCREWS

HEAT

RELAY

M15044

FAN

RELAY

Fig. 2. Mounting the wallplate.

(HOT)

TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

M10409

Fig. 3. Typical hookup in heat application.

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T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT

RC OT

PILOTSTAT

CONTROL

(IF USED)

COMPRESSOR

CONTACTOR

COOL

DAMPER

HEAT

RELAY

OUTDOOR

TEMPERATURE

SENSOR

TH/

FAN

RELAY

HEAT

DAMPER

OUTDOOR

TEMPERATURE

SENSOR

LIMIT

CONTROL

MILLIVOLTAGE

GENERATOR

MILLIVOLTAGE

GAS CONTROL

HOT)

(

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A

SEPARATE CABLE FROM THE THERMOSTAT CABLE.

TRANSFORMER

M20270

Fig. 6. T8602 typical millivoltage heating circuit.

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT

PUMP SYSTEMS.

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A

FOR WRAPAROUND

INSERTION STRIP

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 MM).

SEPARATE CABLE FROM THE THERMOSTAT CABLE.

M10347A

7/16 IN. (11 MM).

Fig. 4. Typical hookup in heat and cool system

with one transformer.

M4826

Fig. 7. Correct wiring technique.

THERMOSTAT

Mounting Thermostat

Engage tabs at the top of the thermostat and

wallplate. See Fig. 8.

COMPRESSOR

CONTACTOR

COOL

DAMPER

HEAT

RELAY

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

OUTDOOR

TEMPERATURE

SENSOR

NOTE: To remove the thermostat from the wall, first pull

out at the bottom of the thermostat; remove top

last.

FAN

RELAY

HEAT

DAMPER

HOT)

(HOT)

(

HEATING

TRANSFORMER

COOLING

TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

A. ENGAGE TABS

AT TOP OF

THERMOSTAT

AND WALLPLATE.

JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A

ONE TRANSFORMER SYSTEM.

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT

PUMP SYSTEMS.

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A

SEPARATE CABLE FROM THE THERMOSTAT CABLE.

T8600D MODELS REQUIRE POWER TO R TERMINAL AT ALL TIMES.

M10348

Fig. 5. Typical hookup in heat and cool system

with two transformers.

B. PRESS LOWER

EDGE OF CASE

TO LATCH.

M14628

Fig. 8. Mounting thermostat on wallplate.

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T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

•

configure Installer Setup,

Using Thermostat Keys

check Self-Test,

The thermostat keys are used to:

display outdoor temperature (select models),

•

set current day and time,

program times and setpoints for heating and cooling,

temporarily override program temperatures,

display present setting,

See Fig. 9 for location of the keys.

NOTE: Always press the keys with your fingertip or

similar blunt tool. Sharp instruments like a pen

or pencil point can damage the keyboard.

INCREASE TIME SETTING

OR SCROLL FORWARD

THROUGH INSTALLER SETUP

AND SYSTEM TEST

SET WAKE TIMES

AND SETPOINTS

SET LEAVE TIMES

AND SETPOINTS

SET RETURN TIMES

AND SETPOINTS

INCREASE TEMPERATURE

SETTING OR SCROLL

FORWARD THROUGH

INSTALLER SETUP OPTIONS

DECREASE TEMPERATURE

SETTING OR SCROLL

BACKWARD THROUGH

INSTALLER SETUP OPTIONS

SET CURRENT

DAY AND TIME

RETURN TO

NORMAL

OPERATIONS

DISPLAY INFORMATION

SUCH AS PRESENT

SETTINGS AND OUTDOOR

TEMPERATURE

ENTER

INDEFINITE

OR TIMED

HOLD MODE

Time

Set Program

Leave

Return

SET SLEEP TIMES

AND SETPOINTS

Run

Program

Set Current

Day/Time

Wake

Sleep

Cool

Heat Off

Heat/Cool

Settings

SYSTEM SWITCH

FAN SWITCH

Hold Temp

Day

System

SET CURRENT OR

PROGRAM DAY

Auto

Daylight

Time

Copy

Fan

CHANGE BETWEEN

DAYLIGHT SAVINGS

AND STANDARD TIME

DECREASE TIME SETTING OR

SCROLL BACKWARD THROUGH

INSTALLER SETUP AND SYSTEM TEST

CHANGE BETWEEN

HEATING AND COOLING

SETPOINTS

COPY ONE PROGRAMMED

DAY TO ANOTHER DAY

M14880

Fig. 9. T8602D key locations and descriptions.

SETTINGS

Temperature Settings

Refer to Table 2 for the default program. If the daytime

energy savings period is not used, press the period key

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.

(

Leave or Return) until the time is blank. See Owner’s

Guide for complete instructions on changing the

program.

Table 2. Default Program Settings.

System settings control the thermostat operation:

Heat: The thermostat controls the heating.

Off: Both the heating and cooling are off.

Cool: The thermostat controls the cooling.

Fan settings control the system fan:

Period

Time

Heat Setpoint Cool Setpoint

Wake

6:00 AM

70°F

78°F

(21°C)

(25.5°C)

Leave

Return

Sleep

8:00AM

62°F

85°F

On: Fan operates continuously.

(

16.5°C)

(29.5°C)

Auto: Fan operates with equipment.

5:00 PM

10:00 PM

70°F

78°F

(

21°C)

(25.5°C)

62°F

82°F

(

16.5°C)

(28°C)

Time

Set Program

Leave

Return

Run

Program

Set Current

Day/Time

Wake

Sleep

Cool

Heat Off

Cool

Heat

Off

Hold Temp

Day

at tt /i Cn go so l

System

Auto

System

Daylight

Time

Copy

Fan

Auto

Fan

M14881

Fig. 10. Thermostat System and Fan key locations.

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T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

FAN OPERATION SWITCH

The thermostat fan operation switch, labeled FUEL

SWITCH in Fig. 11 is factory set in the F position. This is

the correct setting for most systems. If your system is an

electric heat system, set the switch to E. The E setting

allows the fan to turn on immediately with the heating or

cooling in a system where the G terminal is connected.

— 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.

System

Heat

Wait Set Program Set Day/Time Temporary Setting

Recovery

Hold for

Off

Cool

Days

MonTue Wed Thu Fri Sat Sun Repl Batt Room

Wake Leave Return Sleep

DST

Heat Cool

M19014

Fig. 12. Display of all LCD segments.

FUEL SWITCH

M12676

Fig. 11. Fan operation switch.

INSTALLER SETUP

NUMBER DISPLAY

(COLUMN 2 OF TABLE 3)

FACTORY SETTING OR OTHER

CHOICE DISPLAY (COLUMN 3

OR 5 OF TABLE 3)

NOTE: For most applications, the thermostat factory-

settings do not require changing. Review

M14618

factory settings in Table 3 and if no changes are

necessary, go to the Installer Self-Test section.

Fig. 13. Display of Installer Setup number and

setting.

The Installer Setup is used to customize the thermostat

to specific systems. Some of the options include

temperature display 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.

IMPORTANT

Only configurable 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 com-

plete, review the settings to confirm that they

match the system.

A combination of key presses are 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. 12

and 13.

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T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

Table 3. Thermostat Installer Setup Options.

Installer Setup

Number (Press

Time ∆ key to

change)

Other Choices

(Press ꢀ or ꢁ key to change)

Factory Setting

Display Description

Actual

Select

Display

Description

Setting

Not Used.

1 thru 3

—

Heating cycle

6—6 cph used for 1, 3 or 9 1—1 cph used for radiant

rate.

conventional heat

floor heat, gravity system

—3 cph used for hot water

systems or high

efficiency furnaces

—9 cph used for electric

heat systems

Not Used.

5 thru 12

—

Adaptive

Intelligent

Recovery™

control.

AdaptiveIntelligent

Conventional recovery

(system starts recovery at

programmed time).

Recovery™

control is activated

(system starts

early so setpoint is

reached by start of

program period).

Degree

Temperature is

Temperature is displayed

in °C

temperature

display

displayed in °F

Not Used.

Clock format.

—

12-hour clock

24-hour clock format.

format.

Not Used.

17 thru 23

—

Outdoor

No outdoor

temperature is

displayed.

Outdoor temperature is

displayed. Needs a

C7089B1000 Outdoor

Temperature Sensor to

operate.

temperature

display(models

with OT

terminals).

Not Used.

25 thru 32

—

Minimum off

time for the

compressor.

5 minute minimum 0 thru 4

Minimum number of minutes

(0 thru 5) the compressor is

off between calls for the

compressor.

off time for the

compressor.

Temperature

range stops in

heating.

Temperature

range stops in

cooling.

—

Highest heating

setpoint setting.

40 to 89 Temperature range (1°F

increments) of heating

setpoint settings.

Lowest cooling

setpoint setting.

46 to 99 Temperature range (1°F

increments) of cooling

setpoint settings.

Not Used.

—

69-1670

T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

Table 3. Thermostat Installer Setup Options. (Continued)

Installer Setup

Other Choices

Number (Press

Time ∆ key to

change)

Factory Setting

Display Description

(Press ꢀ or ꢁ key to change)

Actual

Select

Display

Description

Setting

Temperature

No difference in

3 thru -3 1—Display adjusts to 1°F

higher than actual room

temperature.

display

displayed

adjustment.

temperature and

actual room

2—Display adjusts to 2°F

higher than actual room

temperature.

—Display adjusts to 3°F

higher than actual room

temperature.

1—Display adjusts to 1°F

lower than actual room

temperature.

2—Display adjusts to 2°F

lower than actual room

temperature.

3—Display adjusts to 3°F

lower than actual room

temperature.

Furnace Air

Filter Timer.

90 days (calendar 0, 1, 3, 4 0 – off

days)

1 – 30 days

– 180 days

– 365 days

(

Time is counted by calendar

days in any mode.)

Humidifier Pad

Monitor.

Off

1, 2, 3

1 – 90 days

2 – 180 days

– 365 days

(

Time is counted by calendar

days in heat mode.)

Ultraviolet (UV)

Air Treatment

System Lamp

Monitor.

Off

1 – 365 days

(Time is counted by calendar

days in any mode.)

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.

69-1670

T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

Setting Current Day and Time

Press Set Current Day/Time.

Set Day/Time

NOTE: On initial powerup or after an extended power

loss, 1:00 pm flashes on the display until a

key is pressed.

Time

Set Program

Leave

Return

Daylight

Time

ProR

De at yC / uT ri mr e

Wake

Sleep

Fan

Hold Temp

Day

Settings

Heat/Cool

System

Tue

DaT

i ml ig

Copy

DST

M14622

Press Run Program.

Set Day/Time

Time

Set Program

Leave

Return

Sys Ht ee ma t

Set Current

Day/Time

ProR

De at yC / uT ri mr e

Wake

Sleep

Fan

Hold Temp

Day

eat tt /i Cn go so l

System

Mon

Time

Set Program

Leave

Return

Run

Program

ProR

De at yC / uT ri mr e

Wake

Sleep

Fan

DaT

i ml ig

Copy

Fan

Hold Temp

Day

eat tt /i Cn go so l

System

Tue

Wake

Room

M14619

DST

Auto

DaT

i ml ig

Copy

M14623

Press Day until the current day is displayed.

NOTE: Sun=Sunday, Mon=Monday,

Tue=Tuesday, Wed=Wednesday,

View or Reset Timer Settings

When the thermostat activates a timer, the thermostat

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

flashes Filter until the timer resets.

Reset the timer by pressing the i key until the

expired timer is displayed.

Set Day/Time

Time

Set Program

Leave

Return

ProR

De at yC / uT ri mr e

Wake

Sleep

Fan

Day

Settings

Heat/Cool

Tue

Hold Temp

Day

System

DaT

i ml ig

Copy

M14620

Filter

Days

Press Time ∆ or Time ∇ until the current time is

displayed.

M20243

NOTE: Tapping the Set Current Day/Time changes the

time in one hour increments.

Press the Time ∆ key to reset the timer.

Time

Set Day/Time

Filter

Days

Time

Set Program

Leave

Return

ProR

De at yC / uT ri mr e

Wake

Sleep

Fan

Hold Temp

Day

at tt /i Cn go so l

System

Tue

DaT

i ml ig

Copy

M14621

M20244

Press the Run Program key.

NOTE: If the current time is Daylight Savings Time,

press Daylight Time until DST is displayed.

NOTE: You can view the number of days remaining at

any time by pressing the i key three or four

times. If more than one timer is active, all active

timers show sequentially when pressing the

i key several times.

69-1670

T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

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.

System

Heat

Off

Wait Set Program Set Day/Time Temporary Setting

Recovery

Hold for

Cool

Days

CAUTION

MonTue Wed Thu Fri Sat Sun Repl Batt Room

Wake Leave Return Sleep

DST

Heat Cool

Equipment Damage Hazard.

Minimum compressor off-time is bypassed

during Installer System Test.

Avoid cycling compressor quickly.

M19014

Fig. 14. Display of all LCD segments.

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.

Table 4. Tests Available In Installer System Test.

Test

Number

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.

M14612

0-19

0-39

0-49

Fig. 15. Display of test number.

Refer to Table 5 for the directions and results of the

specific tests.

0 0 to

0 19

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.

Table 5. Installer System Test Options.

Keys to

Press

Test

Number

Description

Heating Equipment System Test

Time ∆

Enter heating equipment system test.

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

Heat and system fan turn off.

ꢀ

ꢁ

Cooling Equipment System Test

Time ∆

Change from heating to cooling equipment system test.

Cool and system fan come on.

Cool and system fan turn off.

ꢀ

ꢁ

Fan Equipment System Test

Time ∆

Change from cooling to fan equipment system test.

Fan comes on.

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 change. Press Time ∇ to go to the previous test and Time ∆ to go to

the next test. The Run Program key will not exit this test. Press Time ∆ or Time ∇ and then the

Run Program key to exit.

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T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT INFORMATION

Press the Time ∆ key to access the thermostat

4. Press the increase ꢀ key again to display the soft-

information.

ware revision number.

(Example: 001 = Revision number 1).

M14613

M14616

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.

Press the increase ꢀ key again to display the

EEPROM identification code.

(Example: 314 = EEPROM ID 314).

(

Example: 027 = February 1997).

M14617

M14614

Press the Run Program key to exit the System

Test. The System Test times out after four minutes

without any key presses.

Press the increase ꢀ key again to display the soft-

ware identification code.

(Example: 02 = software ID code 2).

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

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T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

TROUBLESHOOTING GUIDE

Table 6. Troubleshooting Guide.

Possible Cause

Symptom

Action

Display does not

Thermostat is not being

• Check if batteries are present and installed correctly.

— If batteries are present and installed correctly, replace

thermostat.

come on.

powered.

Temperature

Room temperature display has Enter Installer Setup number 37 and reconfigure the display.

display is incorrect. been reconfigured.

Thermostat is configured for °F Enter Installer Setup number 14 and reconfigure the display.

or °C display.

Bad thermostat location.

Relocate the thermostat.

Temperature

The upper or lower temperature Check the temperature setpoints:

limits were reached. • Heating limits are 40 to 90°F (4.5 to 32°C)

• Cooling limits are 48 to 99°F (7 to 37°C)

settings do not

change. (Example:

Cannot set the

heating higher or

the cooling lower.)

The setpoint temperature range Check Installer Setup numbers 34 and 35 and reconfigure the

stops were configured.

setpoint stops.

Heating does not

No power to the thermostat.

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

come on.

50 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.

Thermostat minimum off time is Wait up to five minutes for the system to respond.

activated.

System selection is not set to

Heat.

Set system selection to Heat.

Heating setpoint is below room Check heating setpoint. Set heating setpoint to desired

temperature.

Cooling does not

come on.

No power to the thermostat.

• 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.

Thermostat minimum off time is • Wait up to five minutes for the system to respond.

activated.

• Enter Installer Setup number 33. Reconfigure minimum off

time (if required).

System selection is not set to

Cool.

Set system selection to Cool.

Cool setpoint is above room

Check cooling setpoint. Set cooling setpoint to desired

temperature.

69-1670

T8602C CHRONOTHERM^®IV DELUXE PROGRAMMABLE THERMOSTATS

Table 6. Troubleshooting Guide. (Continued)

Symptom

System on indicator Fan operation set for F

flame=heat, (conventional heat) when it

Possible Cause

Action

Set Fan Operation switch (Fuel switch).

(

snowflake=cool) is should be set for E (electric

displayed, but no

warm or cool air is

coming from the

registers.

heat).

Conventional heating equipment Wait a minute after seeing the on indicator and then check the

turns on the fan when the

furnace has warmed up to a

setpoint.

registers.

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

not operating.

Outdoor tempera- Option not activated.

Enter Installer Setup number 24 and set to 1. Thermostat must

have OT terminals and a C7089B1000 installed.

ture not displayed

Outdoor

Outdoor sensor is connected

incorrectly.

Wrong sensor.

Refer to C7089B1000 Installation Instructions and check wiring

temperature

between the thermostat and sensor.

display is incorrect

Thermostat

Replace sensor with C7089B1000 Sensor.

Backlight can fade over the life • Wait until Replace Battery indicator is illuminated and

backlight appears of the batteries.

replace batteries.

dim.

• Replace batteries now.

Select models.

Automation and Control Solutions

Honeywell International Inc

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Scarborough, Ontario

M1V 4Z9

985 Douglas Drive North

Golden Valley, MN 55422

Printed in U.S.A. on recycled

paper containing at least 10%

post-consumer paper fibers.

69-1670 G.H. 1-03

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