Honeywell Chronotherm T8602C Users Manual 69 1670 Chronotherm® IV Deluxe Programmable Thermostats

CHRONOTHERM T8602C 69-1670

2015-01-23

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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.
T8602

System

Changeover

System Selection

Fan
Selection

Heat-Cool

Manual

Heat-Off-Cool

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.

INSTALLATION
When Installing this Product...
1.
2.
3.
4.

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
Copyright © 2003 Honeywell •

Comments
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.
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 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.

69-1670

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

YES
NO
5 FEET
[1.5 METERS]

M10106

Fig. 1. Typical location of thermostat.
1.
2.
3.

4.
5.
6.

WIRING

Position and level the wallplate (for appearance
only). The thermostat functions correctly even
when not level.
Use a pencil to mark the mounting holes.
See Fig. 2.
Remove the wallplate from the wall and drill two
3/16 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
(provided) into drilled holes until flush with wall.
Position the wallplate over the holes, pulling wires
through the wiring opening.
Loosely insert the mounting screws into the holes.
Tighten mounting screws.

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.

CAUTION

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

1.
WALL

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.

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
G

MOUNTING
HOLES
MOUNTING
SCREWS

HEAT
RELAY

M15044

FAN
RELAY

Fig. 2. Mounting the wallplate.

L1
(HOT)
L2
TRANSFORMER

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M10409

Fig. 3. Typical hookup in heat application.

69-1670

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT
Y

THERMOSTAT
R

COMPRESSOR
CONTACTOR

COOL
DAMPER

FAN
RELAY

PILOTSTAT
CONTROL
(IF USED)

HEAT
RELAY

OT
1

OUTDOOR
TEMPERATURE
SENSOR

TH
TH/
PP

HEAT
DAMPER

PP
2

MILLIVOLTAGE
GENERATOR

1
L1
(HOT)

LIMIT
CONTROL

OUTDOOR
TEMPERATURE
SENSOR

MILLIVOLTAGE
GAS CONTROL

AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
M20270

TRANSFORMER

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
SEPARATE CABLE FROM THE THERMOSTAT CABLE.
M10347A

FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).

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

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

M4826

Fig. 7. Correct wiring technique.

THERMOSTAT
RC

COMPRESSOR
CONTACTOR

COOL
DAMPER

FAN
RELAY

HEAT
RELAY

Mounting Thermostat

OT
4

1.
2.

OUTDOOR
TEMPERATURE
SENSOR

Engage tabs at the top of the thermostat and
wallplate. See Fig. 8.
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.

HEAT
DAMPER
3
1
L1
(HOT)

L1
(HOT)

L2
1

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.

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.

A. ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.

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.

69-1670

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

Using Thermostat Keys

• configure Installer Setup,
• check Self-Test,
• display outdoor temperature (select models),

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,

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.

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

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

DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE

RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE

Time
Run
Program

Set Program

Set Current
Day/Time

Leave

Wake

Return
Heat

Hold Temp

SET CURRENT OR
PROGRAM DAY

Heat/Cool
Settings

Day

Daylight
Time

Off

SYSTEM SWITCH
Auto

FAN SWITCH

Fan

Copy

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

COPY ONE PROGRAMMED
DAY TO ANOTHER DAY

SET SLEEP TIMES
AND SETPOINTS

Cool

System
On

CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME

Sleep

CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
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
(Leave or Return) until the time is blank. See Owner’s
Guide for complete instructions on changing the
program.

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.

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:
On: Fan operates continuously.
Auto: Fan operates with equipment.

Time
Run
Program

Set Current
Day/Time

Hold Temp

Day

Set Program
Wake

Leave

Heat/Cool
Settings

Off

Heat

Cool

System
On

Copy

Sleep

Return
Heat

Daylight
Time

Period

Auto

Off

Cool

System

Fan

Auto

Fan

M14881

Fig. 10. Thermostat System and Fan key locations.
69-1670

Time

Heat Setpoint Cool Setpoint

Wake

6:00 AM

70°F
(21°C)

78°F
(25.5°C)

Leave

8:00AM

62°F
(16.5°C)

85°F
(29.5°C)

Return

5:00 PM

70°F
(21°C)

78°F
(25.5°C)

Sleep

10:00 PM

62°F
(16.5°C)

82°F
(28°C)

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.

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

AM
PM

System
Heat
Off
Cool

Days
Mon Tue Wed Thu Fri Sat Sun Repl Batt Room
Heat Cool
Wake Leave Return Sleep DST
M19014

Fig. 12. Display of all LCD segments.

FUEL SWITCH

M12676

Fig. 11. Fan operation switch.

INSTALLER SETUP
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)

NOTE: For most applications, the thermostat factorysettings do not require changing. Review
factory settings in Table 3 and if no changes are
necessary, go to the Installer Self-Test section.

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

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 complete, 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.

69-1670

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

Table 3. Thermostat Installer Setup Options.

Select
Not Used.
Heating cycle
rate.

Not Used.

Installer Setup
Number (Press
Time ∆ key to
change)

Display

1 thru 3

—

6—6 cph used for
conventional heat

Factory Setting

(Press

Description

Other Choices
or key to change)

Display

Description

Actual
Setting

—

1, 3 or 9 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

5 thru 12

—

Adaptive
Intelligent
Recovery™
control.

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

Conventional recovery
(system starts recovery at
programmed time).

Degree
temperature
display

Temperature is
displayed in °F

Temperature is displayed
in °C

Not Used.

—

Clock format.

17 thru 23

—

Not Used.
Outdoor
temperature
display (models
with OT
terminals).
Not Used.

—

12-hour clock
format.
—

1
—

No outdoor
temperature is
displayed.

—

5 minute minimum 0 thru 4
off time for the
compressor.

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

Temperature
range stops in
heating.

Highest heating
setpoint setting.

40 to 89

Temperature range (1°F
increments) of heating
setpoint settings.

Temperature
range stops in
cooling.

Lowest cooling
setpoint setting.

46 to 99

Temperature range (1°F
increments) of cooling
setpoint settings.

Not Used.

—

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

25 thru 32

—

24-hour clock format.

Minimum off
time for the
compressor.

69-1670

—

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 3. Thermostat Installer Setup Options. (Continued)
Installer Setup
Number (Press
Time ∆ key to
change)

Display

Temperature
display
adjustment.

Furnace Air
Filter Timer.

90 days (calendar 0, 1, 3, 4
days)

0 – off
1 – 30 days
3 – 180 days
4 – 365 days
(Time is counted by calendar
days in any mode.)

Humidifier Pad
Monitor.

Off

1, 2, 3

1 – 90 days
2 – 180 days
3 – 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.)

Select

Factory Setting

(Press

Description
No difference in
displayed
temperature and
actual room
temperature.

Display
3 thru -3

Other Choices
or key to change)
Description

Actual
Setting

1—Display adjusts to 1°F
higher than actual room
temperature.
2—Display adjusts to 2°F
higher than actual room
temperature.
3—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.

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
1.

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.

Daylight
Time

Time
Run
Program

Hold Temp

Set Current
Day/Time

Leave

Heat/Cool
Settings

Day

Daylight
Time

Set Program
Wake

Return

Sleep

System

Fan

Tue
DST

Copy

M14622

Press Run Program.

Set Day/Time

Set Current
Day/Time

Time
Run
Program

Hold Temp

Set Current
Day/Time

Leave

Heat/Cool
Settings

Day

Daylight
Time

System
Heat

Set Program
Wake

Return

Sleep

System

Fan

Mon

Run
Program

Copy

M14619

Time
Run
Program

Set Current
Day/Time

Leave

Return

Sleep

Fan
Hold Temp

Heat/Cool
Settings

Day

Daylight
Time

Set Program
Wake

System

Copy

Fan

Tue
Wake

Room
DST

Auto

M14623

Press Day until the current day is displayed.

View or Reset Timer Settings

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

When the thermostat activates a timer, the thermostat
flashes Filter until the timer resets.
1.

Reset the timer by pressing the i key until the
expired timer is displayed.

Set Day/Time

Time
Run
Program

Day

Hold Temp

Set Current
Day/Time

Leave

Heat/Cool
Settings

Day

Daylight
Time

Set Program
Wake

Return

Sleep

System

Fan

Tue

Copy

M14620

Filter

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

Days

M20243

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

Press the Time ∆ key to reset the timer.

Time

Filter

Set Day/Time
AM
Time
Run
Program

Hold Temp

Set Current
Day/Time

Day

Daylight
Time

Days

Set Program
Wake

Heat/Cool
Settings

Leave

Return

System

Sleep

Fan

Tue

Copy

M20244

M14621

3.
NOTE: If the current time is Daylight Savings Time,
press Daylight Time until DST is displayed.

69-1670

Press the Run Program key.

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.

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.

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

CAUTION

AM
PM

System
Heat
Off
Cool

Days
Mon Tue Wed Thu Fri Sat Sun Repl Batt Room
Heat Cool
Wake Leave Return Sleep DST

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

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

M14612

Fig. 15. Display of test number.
Refer to Table 5 for the directions and results of the
specific tests.

Keyboard keys test.

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.

69-1670

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT INFORMATION
1.

Press the Time ∆ key to access the thermostat
information.

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).

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.

M14613

M14616

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)
M14615

69-1670

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

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

TROUBLESHOOTING GUIDE
Table 6. Troubleshooting Guide.
Symptom
Display does 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 do not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)

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)

Heating does 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 does not
come on.

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.

69-1670

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
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 F
(conventional heat) when it
should be set for E (electric
heat).

Action
Set Fan Operation switch (Fuel switch).

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.

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

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

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

Thermostat
backlight appears
dim.

• Wait until Replace Battery indicator is illuminated and
replace batteries.
• Replace batteries now.

Backlight can fade over the life
of the batteries.

Replace sensor with C7089B1000 Sensor.

Select models.

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

69-1670 G.H. 1-03

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

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

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User Access                     : Print, Copy, Extract, Assemble, Print high-res
Page Mode                       : UseOutlines
XMP Toolkit                     : Adobe XMP Core 4.0-c316 44.253921, Sun Oct 01 2006 17:14:39
Producer                        : Acrobat Distiller 5.0.5 (Windows)
Create Date                     : 1999:07:07 12:30:47Z
Modify Date                     : 2007:05:07 15:51:44-05:00
Metadata Date                   : 2007:05:07 15:51:44-05:00
Creator Tool                    : FrameMaker 7.0
Format                          : application/pdf
Creator                         : Honeywell
Title                           : 69-1670 - T8602C Chronotherm® IV Deluxe Programmable Thermostats
Description                     : Installation Instructions
Document ID                     : uuid:30cc8e3a-7fa2-4abd-8fcb-fa6e3e0ac6f3
Instance ID                     : uuid:1270214d-465e-4483-9908-a833f8703cf8
Page Count                      : 12
Subject                         : Installation Instructions
Author                          : Honeywell

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Honeywell Chronotherm T8602C Users Manual 69 1670 Chronotherm® IV Deluxe Programmable Thermostats

CHRONOTHERM T8602C 69-1670

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