Honeywell T8611G User Manual

APPLICATION

T8611G Chronotherm® IV

Deluxe Programmable

Heat Pump Thermostats

INSTALLATION INSTRUCTIONS

The T8611G Chronotherm® IV Deluxe Programmable
Heat Pump Thermostats provides electronic control of 24
Vac single-zone heat pump systems.

Table 1. Description of T8611 Thermostats.

T8611 Changeover System Selection Fan Selection Comments

G Automatic Em Heat-Heat-Off-Cool-Auto 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 5 ft (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.

Refer to Table 1 for a general description of the
thermostat. All T8611 thermostats require a common wire
to supply power.

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.

1. Position and level the wallplate (for appearance
only). The thermostat will function correctly 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
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 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 © 2002 Honeywell • • All Rights Reserved

69-1406-1

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

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

THERMOSTAT

YES

NO

NO

5 FEET

[1.5 METERS]

Fig. 1. Typical location of thermostat.

WIRES
THROUGH WALL

WALL
ANCHORS (2)

WALL

O/B

Y1 G E

C

NO

FAN
RELAY

COOLING OR
HEATING
CHANGEOVER
VALVE

COMPRESSOR
CONTACTOR

M10106

1

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

Fig. 3. Typical hookup of T8611G

in a heat pump system.

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

EM. HT.
RELAY

W2

HEAT
RELAY
2

Fig. 4. Correct wiring technique.

RW1

EQUIPMENT

MONITOR 2

EQUIPMENT

MONITOR 1

HEAT
RELAY
1

TRANSFORMER

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

X2 LX1

OT OT

OUTDOOR
SENSOR

1

L1
(HOT)

L2

M11311A

M4826

MOUNTING
HOLES

MOUNTING
SCREWS

M15044

Fig. 2. Mounting the wallplate.

WIRING

All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 for typical hookup. A letter
code is located near each terminal for identification.

CAUTION

Electrical Hazard.
Can cause electrical shock or equipment
damage.

Disconnect power before wiring.

1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 4.

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.

69-1406—1 2

Mounting Thermostat

1. Engage tabs at the top of the thermostat and wall­plate. See Fig. 5.

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.

B.

PRESS LOWER
EDGE OF CASE
TO LATCH.

Fig. 5. Mounting thermostat on wallplate.

M14628

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

A

A

Using Thermostat Keys (Fig. 6)

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 System-Test,

• display outdoor temperature (select models),

• set the system operation,

• set the fan operation.

NOTE: Always press the keys with your fingertip or sim-

ilar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.

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. 7. The fan settings can be set for
each program period individually. The system selection is
for all the program periods.

INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER SETUP

ND SYSTEM TEST

SET CURRENT
DAY AND TIME

RETURN TO
NORMAL
OPERATIONS

ENTER
INDEFINITE
OR TIMED
HOLD MODE

SET CURRENT OR
PROGRAM DAY

CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME

SET WAKE TIMES
AND SETPOINTS

Set Current

Run

Day/Time

Program

Hold Temp

Day

Daylight

Time

COPY ONE PROGRAMMED
DAY TO ANOTHER DAY

Fig. 6. T8611G key locations and descriptions.

SET LEAVE TIMES
AND SETPOINTS

Time Set Program

Wake

Heat/Cool

Settings

Copy

System settings control the thermostat operation:

Em Heat: Emergency heat relay is on continuously.

Thermostat cycles highest stage of heat. Cooling
system is off. Compressor is de-energized.

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:

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

LED Indication

Two LED indicators are located in the upper right of the
thermostat. They indicate when a Check or Fail signal is
sent to the thermostat from the system. See Fig. 8.

SET RETURN TIMES
AND SETPOINTS

Leave

Return Sleep

System Fan

DECREASE TIME SETTING OR
SCROLL BACKWARD 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

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

Time Set Program

Run

Set Current

Program

Day/Time

Hold Temp

Day

Daylight

Time

Leave

Wake

Heat/Cool

Settings

Copy

Return

System Fan

Sleep

Fig. 7. Thermostat System and Fan key locations.

M14625

System

Fan

TWO LED INDICATORS

M10675

Fig. 8. LEDs location.

3 69-1406—1

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

Outdoor

Fan

eat

On

o

Off

Cool

o

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. The fan setting
feature is available on select thermostat models. See
Owner’s Guide, form number 69-0940, for complete
instructions on changing the program.

Table 2. Default Program Settings.

Period Time

Wake 6:45 AM 20°C

Leave 8:45 AM 4.5°C

Return 5:00 PM 20°C

Sleep 10:00 PM 4.5°C

Heat

Setpoint

(68°F)

(40°F)

(68°F)

(40°F)

Cool

Setpoint

25°C
(77°F)

37°C
(99°F)

25°C
(77°F)

37°C
(99°F)

Setting

Auto

Auto

Auto

Auto

Fan

INSTALLER SETUP

NOTE: For most applications, the thermostat factory-

settings will not need to be changed. Review
the factory settings in Table 2 and if no changes
are necessary, go to the Installer System Test
section.

The Installer Setup is used to customize the thermostat
to specific systems. Some of the options include
temperature display, 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 T8611.

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. 9
and 10.

— 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

Recovery
Hold for

Filter

Em Ht

Tue Wed Thu Fri Sat Sun

Mon
Wake Leave Return Sleep

Set Day/TimeSet Program

Aux Ht

Days

AM

PM

Temporary Setting

Room

Repl Batt

DST

Heat

Cool

Em H

Aut

Aut

M14559

Fig. 9. Display of all LCD segments.

INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2 OF TABLE 3)

Fig. 10. Display of Installer Setup

number and setting.

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.

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

M14618

Table 3. Thermostat Installer Setup Options.

Select

Installer Setup

Number (Press

Time ∆ key to

change)

Factory Setting

Other Choices

(Press ! or " key to change)

Not Used. 1 thru 4 — — — — —

Heating cycle
rate.

5 6 Stage 2 1, 6 or 9 1—1 cph

6—6 cph used for last stage

of heat pump systems

9—9 cph used for electric

heat

6 (Not used) — — — —

7 6 Emergency heat 3, 6 or 9

Not Used. 8 thru 11 — — — — —

System setting
adjustment

69-1406—1 4

12 1 Manual

changeover

0 or 2 0—Auto changeover

2—Fixed auto changeover

Actual

SettingDisplay Description Display Description

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

Table 3. Thermostat Installer Setup Options. (Continued)

Select

Adaptive
Intelligent
Recovery™
control.

Degree
temperature
display

Installer Setup

Number (Press

Time ∆ key to

change)

13 0 Adaptive Intelligent

14 1 Temperature is

Factory Setting

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

displayed in °C

Other Choices

(Press ! or " key to change)

1 Conventional recovery

(system starts recovery at
programmed time).

— Temperature is displayed in

°C

Actual

SettingDisplay Description Display Description

Not Used. 15 — — — — —

Clock format. 16 0 12-hour clock

format.

1 24-hour clock format.

Not Used. 17 thru 23 — — — — —

Outdoor
temperature
display (models
with OT
terminals).

24 0 No outdoor

temperature is
displayed.

1 Outdoor temperature is

displayed. Needs a
C7089B1000 Outdoor
Temperature Sensor to
operate.

Not Used. 25 thru 28 — — — — —

O/B terminal
energized in
heating or
cooling.

Deadband 30 3 Heating and

29 0 O/B terminal

energized for
reversing valve in
cooling.

cooling setpoints
can be set no
closer than 3°F
(1.5°C).

1 O/B terminal energized for

4 thru 10 Heating and cooling

reversing valve in heating

setpoints can be set no
closer than the chosen
value:

4—4°F (2°C)
5—5°F (2.5°C)
6—6°F (3°C)
7—7°F (3.5°C)
8—8°F (4°C)
9—9°F (4.5°C)
10—10°F (5°C)

Not Used. 31 and 32 — — — — —

Minimum off
time for the
compressor.

Temperature
range stops in
heating.

Temperature
range stops in
cooling.

33 5 5 minute minimum

34 90 Highest heating

35 45 Lowest cooling

off time for the
compressor.

setpoint setting.

setpoint setting.

0 thru 4 Minimum number of minutes

40 thru 89 Temperature range (1°F

46 thru 99 Temperature range (1°F

(0 thru 5) the compressor
will be off between calls for
the compressor.

increments) of heating
setpoint settings.

increments) of cooling
setpoint settings

Not Used. 36 — — — — —

—

5 69-1406—1

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

Table 3. Thermostat Installer Setup Options. (Continued)

Installer Setup

Number (Press

Select

Temperature
display
adjustment.

Furnace Air
Filter Timer.

Humidifier Pad
Monitor.

Ultraviolet (UV)
Air Treatment
System Lamp
Monitor.

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.

Time ∆ key to

change)

37 0 No difference in

43 0 Off 1, 2, 3, 4 1 – 10 days

44 0 Off 1, 2, 3 1 – 90 days

45 0 Off 1 1 – 365 days

Factory Setting

displayed
temperature and
actual room
temperature.

-3 thru 3 1—Display adjusts to 1°F

Other Choices

(Press ! or " key to change)

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.

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

2 – 180 days
3 – 365 days
(Times counted by calendar
days in heat mode.)

(Times counted by calendar
days in any mode.)

Actual

SettingDisplay Description Display Description

69-1406—1 6

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

Outdoor

Fan

eat

On

o

Off

Cool

o

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.

Set Day/Time

Time Set Program

Set Current

Run

Leave

Wake

Return Sleep

Day/Time

Set Current

Day/Time

Program

Heat/Cool

Hold Temp

Day

Settings

Daylight

Copy

Time

System Fan

Mon

2. Press Day until the current day is displayed.

NOTE: Sun=Sunday, Mon=Monday,

Tue=Tuesday, Wed=Wednesday,
Thu=Thursday, Fri=Friday, Sat=Saturday

.

Time Set Program

Set Current

Run

Leave

Wake

Return Sleep

Day/Time

Day

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

NOTE: Tapping the Set Current Day/Time changes the

Program

Heat/Cool

Hold Temp

System Fan

Day

Settings

Daylight

Copy

Time

displayed.

time in one-hour increments.

.

Time

Time Set Program

Set Current

Run

Leave

Wake

Return Sleep

Day/Time

Program

Heat/Cool

Hold Temp

NOTE: If the current time is Daylight Savings Time,

press Daylight Time until DST is displayed.

System Fan

Day

Settings

Daylight

Copy

Time

.

Daylight

Time

Heat/Cool

Hold Temp

System Fan

Day

Settings

Daylight

Copy

Time

Time Set Program

Set Current

Run

Leave

Wake

Return Sleep

Day/Time

Program

4. Press Run Program.

PM

M14619

Set Day/Time

PM

Tue

M14620

Set Day/Time

AM

Tue

M14621

Set Day/Time

AM

Tue

DST

M14622

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.

CAUTION

Equipment Damage Hazard.
Minimum compressor off-time is bypassed
during INstaller System Test.

Avoid cycling compressor quickly.

To start the sytem-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.
11 and 12.

Table 4. Tests Available In Installer System Test.

Test Number System Test Description

10-19 Heating equipment can be turned

30-39 Cooling equipment can be turned on

40-49 Fan equipment can be turned on

60 0 to 60 19 Keyboard keys test.

70-79 Thermostat information including

Wait

Recovery
Hold for

Filter

Em Ht

Tue Wed Thu Fri Sat Sun

Mon

Wake Leave Return Sleep

Fig. 11. Display of all LCD segments.

.

on and off.

and off.

and off.

date code and software versions are
displayed.

Days

AM

PM

Temporary Setting

Room

Repl Batt

DST

Heat

Cool

Set Day/TimeSet Program

Aux Ht

Em H

Aut

Aut

M14559

M14612

Run

Program

System

Time Set Program

Set Current

Run

Leave

Wake

Return Sleep

Day/Time

Program

Heat/Cool

Hold Temp

System Fan

Day

Settings

Daylight

Copy

Time

Wake

AM

Tue

DST

Heat

Fan

Room

Auto

Refer to Table 5 for the directions and results of the

M14623

specific tests.

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

Fig. 12. Display of test number

Time ∇ to go back to the previous test. Press
Run Program to exit the system test

7 69-1406—1

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

Table 5. Installer System Test Options.

Keys to

Press

Tes t

Number Description

Heating Equipment System-Test

Time ∆ 10 Enter heating equipment System Test.

! 11 Stage-one heat comes on. The system fan is also energized.

! 12 Stage-two heat comes on. Stage-one heat and system fan remain on.

" 11 Stage-two heat turns off.

" 10 Stage-one heat and system fan turn off.

Emergency Heating Equipment System Test

Time ∆ 20 Change from heating to emergency heating equipment System Test.

! 21 Emergency heat come on.

" 20 Emergency heat turn off.

Cooling Equipment System Test

Time ∆ 30 Change from heating or emergency heating to cooling equipment System Test.

! 31 Cool and system fan come on.

" 30 Cool and system fan turn off.

Fan Equipment System-Test

Time ∆ 40 Change from cooling to fan equipment System Test.

! 41 Fan comes on.

" 40 Fan turns off.

Key Operation System-Test

Time ∆ 60 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 will not exit this test. Press Time ∆ or Time ∇ and then the Run
Program key to exit.

69-1406—1 8

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

THERMOSTAT INFORMATION

1. Press the Time ∆ key to access the thermostat

information.

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).

3. Press the increase ! key again to display the soft-
ware identification code. (Example: 02 = software
ID code 2).

M14613

M14614

M14615

4. Press the increase ! key again to display the soft-
ware revision number (Example: 001 = Revision
number 1).

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

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

M14616

M14617

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.

9 69-1406—1

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

TROUBLESHOOTING GUIDE

Table 6. Troubleshooting Guide.

Symptom Possible Cause Action

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.

Cooling will not
come on.

Thermostat is not being
powered.

Room temperature display has
been reconfigured.

Thermostat is configured for °F
or °C display.

Bad thermostat location. Relocate the thermostat.

The upper or lower temperature
limits were reached.

The setpoint temperature range
stops were configured.

No power to the thermostat. • Check for 24 Vac between R and C terminals.

Thermostat minimum off time is
activated.

System selection is not set to
Heat.

Heating setpoint is below room
temperature.

No power to the thermostat. • Check for 24 Vac between R and C.

Thermostat minimum off time is
activated.

System selection is not set to
Cool.

Cool setpoint is above room
temperature.

• Check for 24 Vac between R and C 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

Enter Installer Setup number 37 and reconfigure the display.

Enter Installer Setup number 14 and reconfigure the display.

Check the temperature setpoints:

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

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

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

— 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.

Set system selection to Heat.

Check heating setpoint. Set heating setpoint to desired
temperature.

— 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.

69-1406—1 10

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

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.

Outdoor tempera­ture not displayed

Outdoor
temperature

display is incorrect

a

Select models.

Heating or cooling equipment is
not operating.

Option not activated. Enter Installer Setup number 24 and set to 1. Thermostat must

a

Outdoor sensor is connected
incorrectly.

a

Wrong sensor. Replace sensor with C7089B1000 Sensor.

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

have OT terminals and a C7089B1000 installed.

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

11 69-1406—1

T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS

Automation and Control Solutions

Honeywell Honeywell Limited-Ho neywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario

M1V 4Z

69-1406—1 G.H. Rev. 12-02 www.honeywell.com/yourhome