Honeywell Chronotherm Iv T8602D Users Manual 69 1510 4

Chronotherm IV T8602D 69-1510

2015-01-23

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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.

Table 1. Description of T8602 Thermostats.
T8602

System

Changeover

Heat-Cool

Manual or
Automatic
Selectable

System
Selection

Fan
Selection

Heat-Off-Cool or
Heat-Off-Cool-Auto

On-Auto

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.

When Installing this Product...
2.
3.
4.

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

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.

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.

® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc. •

System and fan selections are done
by keyboard.

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.

INSTALLATION
1.

Comments

2.
3.

4.
5.
6.

Position and level the wallplate (for appearance
only). The thermostat will function properly even
when not level.
Use a pencil to mark the mounting holes. See Fig.
2.
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.
Position the wallplate over the holes, pulling wires
through the wiring opening.
Loosely insert the mounting screws into the holes.
Tighten mounting screws.

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

YES
NO

NO
1.5 METERS
(5 FEET)

M10856

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.

WALL
WIRES
THROUGH WALL

2.
3.
4.

WALL
ANCHORS (2)

Securely tighten each terminal screw.
Push excess wire back into the hole.
Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat.
THERMOSTAT
RC

MOUNTING
HOLES

COMPRESSOR
CONTACTOR

MOUNTING
SCREWS

OT
3

2
HEAT
RELAY
FAN
RELAY

M15044

OUTDOOR
TEMPERATURE
SENSOR
1

L1
(HOT)

Fig. 2. Mounting the wallplate.

L2
1

WIRING
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.

COOLING
TRANSFORMER

HEATING
TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A
ONE TRANSFORMER SYSTEM.

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
M10855

CAUTION

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

Electrical Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before wiring.

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

THERMOSTAT
Y

MILLIVOLT HEATING-24Vac
COOLING WALLPLATE

OT
PILOTSTAT
CONTROL
(IF USED)

COMPRESSOR
CONTACTOR

COOL
DAMPER

FAN
RELAY

HEAT
RELAY

TH
OUTDOOR
TEMPERATURE
SENSOR

TH/
PP

HEAT
DAMPER

PP
MILLIVOLTAGE
GENERATOR

2
1

L2
TRANSFORMER
1

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
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
M10347A

MILLIVOLTAGE
GAS CONTROL

1
L1
(HOT)
L2

L1
(HOT)

CHANGEOVER
RELAY

LIMIT
CONTROL

FAN
RELAY

COOLING
CONTACTOR

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).

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

FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).

M4826

MILLIVOLT HEATING-ONLY
WALLPLATE
PILOTSTAT
CONTROL
(IF USED)

Fig. 7. Correct wiring technique.

Mounting Thermostat
1.

TH
LIMIT
CONTROL

TH/
PP

PP
MILLIVOLTAGE
GENERATOR

MILLIVOLTAGE
GAS CONTROL

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

M2931

Fig. 5. Typical hookup in millivoltage heating circuit.

A. ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.

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 TEMPERATURE
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP OPTIONS

SET RETURN TIMES
AND SETPOINTS

SET LEAVE TIMES
AND SETPOINTS

SET WAKE TIMES
INCREASE TIME SETTING
AND SETPOINTS
OR SCROLL FORWARD
THROUGH INSTALLER SETUP
AND SYSTEM TEST

DECREASE TEMPERATURE
SETTING OR SCROLL
BACKWARD THROUGH
INSTALLER SETUP OPTIONS

SET CURRENT
DAY AND TIME

DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE

RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE

Time
Set Current
Day/Time

Run
Program

Hold Temp

SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME

Heat/Cool
Settings

Day

Daylight
Time

Set Program
Leave

Wake

Return

Sleep

System

Fan

SET SLEEP TIMES
AND SETPOINTS

SELECT FAN
OPERATION
SELECT SYSTEM
OPERATION

Copy

COPY ONE PROGRAMMED
DAY TO ANOTHER DAY

CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
M14624

DECREASE TIME SETTING OR
SCROLL BACKWARD THROUGH
INSTALLER SETUP AND SYSTEM TEST

Fig. 9. T8602D key locations and descriptions.

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.

Time
Run
Program

Set Current
Day/Time

Hold Temp

Day

Daylight
Time

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.

Leave

Return

Sleep

System

Fan

System

Copy

Fan

M14625

Fig. 10. Thermostat System and Fan key locations.

Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.

69-1510-4

Set Program
Wake

Heat/Cool
Settings

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

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.

System
Em Heat
Off
Cool
Auto
Fan
On

Wait Set Program Set Day/Time Temporary Setting
Recovery
Hold for

AM
PM

Filter Em Ht Aux Ht Days
Mon Tue Wed Thu Fri Sat Sun Repl Batt Room Outdoor
Heat Cool
Wake Leave Return Sleep DST

Auto

Table 2. Default Program Settings.
Period

Time

Heat
Setpoint

Cool
Setpoint

M14559

Fan
Setting

Wake

6:45 AM

20°C

25°C

Auto

Leave

8:45 AM

4.5°C

37°C

Auto

Return

5:00 PM

20°C

25°C

Auto

Sleep

10:00 PM

4.5°C

37°C

Auto

Fig. 11. Display of all LCD segments.

INSTALLER SETUP

INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)

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.

FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 3
OR 5 OF TABLE 3)
M14618

Fig. 12. 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, 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.

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.

A combination of key presses is required to use the
Installer Setup feature.

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.

— 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.

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

Table 3. Thermostat Installer Setup Options.
Installer Setup
Number (Press
Time ∆ key to
change)

Display

Description

Display

Description

Actual
Setting

Not Used.

—

Fan
operation.

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

Conventional
applications
where
equipment
controls fan
operation in heat
mode.

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

Not Used.

—

Heating cycle
rate.

6—6 cph used
for conventional
heat.

Not Used.

5 thru 11

—

System
setting
adjustment

Manual
changeover

0 or 2

Adaptive
Intelligent
Recovery™
control.

Conventional
recovery
(system starts
recovery at
programmed
time).

14 thru 15

—

17 thru 23

—

25 thru 32

—

Minimum off
time for the
compressor.

5 minute
minimum off time
for the
compressor.

0 thru 4

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

Temperature
range stops
in heating.

32.0

Highest setting
for heating
setpoint.

4.5 to
31.5

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

Temperature
range stops
in cooling.

7.0

Lowest setting
for cooling
setpoint.

7.5 to
37.0

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

Not Used.

—

Select

Not Used.
Clock format.
Not Used.
Outdoor
temperature
display
(select
models).
Not Used.

69-1510-4

Factory Setting

(Press

—

1, 3, or
9

—

1
—

No outdoor
temperature is
displayed.

—

—
6

—

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

—

12-hour clock
format.

Other Choices
or key to change)

—

24-hour clock format.
—

—

Outdoor temperature is
displayed. Needs a
C7089B1000 Outdoor
Temperature Sensor to
operate.
—

—

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS
Table 3. Thermostat Installer Setup Options. (Continued)
Installer Setup
Number (Press
Time ∆ key to
change)

Display

Description

Display

Description

Temperature
display
adjustment.

No difference in
displayed
temperature and
actual room
temperature.

1.5 thru
-1.5

.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.

Furnace Air
Filter Timer.

Off

1, 2, 3,
4

1 – 10 days
2 – 30 days
3 – 60 days
4 – 120 days
(Time counted when heat,
cool or fan is running.)

Humidifier
Pad Monitor.

Off

1, 2, 3

1 – 90 days
2 – 180 days
3 – 365 days
(Time counted by calendar
days in heat mode.)

Ultraviolet
(UV) Air
Treatment
System Lamp
Monitor.

Off

Select

Factory Setting

(Press

Other Choices
or key to change)
Actual
Setting

1 – 365 days
(Times 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.

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

INSTALLER SYSTEM TEST

Setting Current Day and Time
1.

Press Set Current Day/Time.

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

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

CAUTION

Equipment Damage Hazard.
Minimum compressor off-time is bypassed
during Installer System Test.
Avoid cycling compressor quickly.

Set Day/Time

Set Current
Day/Time

Time
Run
Program

Hold Temp

Set Current
Day/Time

Wake

Daylight
Time

Leave

Heat/Cool
Settings

Day

Set Program
Return

Sleep

System

Fan

Mon

Copy

M14619

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.

Press Day until the current day is displayed.

NOTE: Sun=Sunday, Mon=Monday,
Tue=Tuesday, Wed=Wednesday,
Thu=Thursday, Fri=Friday, Sat=Saturday.

Table 4. Tests Available In Installer System Test.
Test
Number

Set Day/Time

Time
Run
Program

Day

Hold Temp

Set Current
Day/Time

Daylight
Time

Leave

Heat/Cool
Settings

Day

Set Program
Wake

Return

Sleep

System

Fan

M14620

System Test Description

Tue

Copy

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

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

10-19

Heating equipment can be turned on and
off.

30-39

Cooling equipment can be turned on and
off.

40-49

Fan equipment can be turned on and off.

60 0 to
60 19

Keyboard keys test.

70-79

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

Time
Set Day/Time
AM
Time
Run
Program

Hold Temp

Set Current
Day/Time

Day

Daylight
Time

Set Program
Wake

Leave

Heat/Cool
Settings

Return

System

Sleep

Fan

Tue

Copy

M14621

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

Wait Set Program Set Day/Time Temporary Setting
Recovery
Hold for

AM
PM

Filter Em Ht Aux Ht Days
Mon Tue Wed Thu Fri Sat Sun Repl Batt Room Outdoor
Heat Cool
Wake Leave Return Sleep DST

Set Day/Time

System
Em Heat
Off
Cool
Auto
Fan
On
Auto

Daylight
Time

Time
Run
Program

Hold Temp

Set Current
Day/Time

Daylight
Time

Leave

Heat/Cool
Settings

Day

M14559

Set Program
Wake

Return

Sleep

System

Fan

Tue

Fig. 13. Display of all LCD segments.

DST

Copy

M14622

Press Run Program.

System
Heat

Run
Program

Time
Run
Program

Set Current
Day/Time

Set Program
Wake

Leave

Return

Sleep

System

Fan

Fan
Hold Temp

Heat/Cool
Settings

Day

Daylight
Time

Copy

Tue
Wake

Room
DST

Auto

M14623

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
69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

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 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.

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

THERMOSTAT INFORMATION
1.

Press the increase key again to display the software revision number.
(Example: 001 = Revision number 1).

Press the increase key again to display the
EEPROM identification code.
(Example: 314 = EEPROM ID 314).

Press the Run Program key to exit the system test.
The system test times out after four minutes
without any key presses.

Press the Time ∆ key to access the thermostat
information.

M14616

M14613

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).

M14617

M14614

Press the increase key again to display the
software 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

69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

TROUBLESHOOTING GUIDE
Table 6. Troubleshooting Guide.
Symptom
Display will not
come on.

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.

Temperature
Room temperature display has
display is incorrect. been reconfigured.

Enter Installer Setup number 37 and reconfigure the display.

Thermostat is configured for °F
or °C display.

Enter Installer Setup number 14 and reconfigure the display.

Bad thermostat location.

Relocate the thermostat.

Temperature
settings will not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)

The upper or lower temperature Check the temperature setpoint:
limits were reached.
• Heating limits are 4.5 to 32°C
• Cooling limits are 7 to 37°C

Heating will not
come on.

No power to the thermostat.

The setpoint temperature range Check Installer Setup numbers 34 and 35 and reconfigure the
stops were configured.
setpoint stops.
• 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.

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

Cooling will not
come on.

Heating or cooling
come on
momentarily and
shut off.

System selection is not set to
Heat.

Set system selection to Heat.

Heating setpoint is below room
temperature.

Check heating setpoint. Set heating setpoint to desired
temperature.

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
activated.

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

Check cooling setpoint. Set cooling setpoint to desired
temperature.

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

Add resistor in parallel with load or install interface relay.

69-1510-4

Table 6. Troubleshooting Guide. (Continued)
Symptom
System on indicator
(flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.

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

Action
Enter Installer Setup number 2 and reconfigure the fan
operation.

Conventional heating equipment Wait a minute after seeing the on indicator and then check the
turns on the fan when the
registers.
furnace has warmed up to a
setpoint.
Heating or cooling equipment is Verify operation of heating or cooling equipment in self-test.
not operating.

Outdoor temperature not displayeda

Option not activated.

Outdoor sensor is connected
Outdoor
incorrectly.
temperature
a
display is incorrect Wrong sensor.

Enter Installer Setup number 24 and set to 1. Thermostat must
have OT terminals and a C7089B1000 Sensor installed.
Refer to C7089B1000 Installation Instructions and check wiring
between the thermostat and sensor.
Replace sensor with C7089B1000 Sensor.

Select models.

Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422

69-1510-4

Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9

G.H. Rev. 03-03

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

www.honeywell.com/yourhome

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Honeywell Chronotherm Iv T8602D Users Manual 69 1510 4

Chronotherm IV T8602D 69-1510

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