Honeywell T8602C User manual

® U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

69-1670

T8602C Chronotherm® IV

Deluxe Programmable

Thermostats

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.

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.

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.

T8602 System Changeover System Selection

Fan

Selection Comments

C Heat-Cool Manual Heat-Off-Cool On-Auto System and fan selections are made on

keyboard.

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

69-1670 2

Fig. 1. Typical location of thermostat.

1. Position and level the wallplate (for appearance

only). The thermostat functions 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 drilled holes until flush with 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.

Fig. 2. Mounting the wallplate.

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.

CAUTION

Electrical Hazard.

Can cause electric shock or equipment

damage.

Disconnect power before wiring.

1. Loosen the terminal screws on the wallplate and

connect the system wires. See Fig. 7.

IMPORTANT

Use 18 gauge, color-coded thermostat cable for

proper wiring.

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole.

4. Plug the hole with nonflammable insulation to

prevent drafts from affecting the thermostat.

Fig. 3. Typical hookup in heat application.

5 FEET

[1.5 METERS]

YES NO

M1010

WIRES

THROUGH WALL

WALL

MOUNTING

HOLES

M15044

MOUNTING

SCREWS

WALL

ANCHORS (2)

(HOT)

M10409

FAN

RELAY

THERMOSTAT

HEAT

RELAY

TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

3 69-1670

Fig. 4. Typical hookup in heat and cool system

with one transformer.

Fig. 5. Typical hookup in heat and cool system

with two transformers.

Fig. 6. T8602 typical millivoltage heating circuit.

Fig. 7. Correct wiring technique.

Mounting Thermostat

1. Engage tabs at the top of the thermostat and

wallplate. See Fig. 8.

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.

Fig. 8. Mounting thermostat on wallplate.

(HOT

)

M10347A

FAN

RELAY

THERMOSTAT

HEAT

RELAY

COMPRESSOR

CONTACTOR

TRANSFORMER

HEAT

DAMPER

COOL

DAMPER

1POWER 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.

OTOT

OUTDOOR

TEMPERATURE

SENSOR

(HOT

)

M10348

FAN

RELAY

THERMOSTAT

HEAT

RELAY

(HOT)

COMPRESSOR

CONTACTOR

HEATING

TRANSFORMER

COOLING

TRANSFORMER

HEAT

DAMPER

COOL

DAMPER

1POWER 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.

OTOT

OUTDOOR

TEMPERATURE

SENSOR

M20270

GO B

THERMOSTAT

LIMIT

CONTROL

PILOTSTAT

CONTROL

(IF USED)

MILLIVOLTAGE

GAS CONTROL

MILLIVOLTAGE

GENERATOR

YRW

1AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A

SEPARATE CABLE FROM THE THERMOSTAT CABLE.

OTOT

OUTDOOR

TEMPERATURE

SENSOR

TH/

M482

OR WRAPAROUND

NSERTION STRIP

/16 IN. (11 MM).

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 MM).

M1462

PRESS LOWER

EDGE OF CASE

TO LATCH.

ENGAGE TABS

AT TOP OF

THERMOSTAT

AND WALLPLATE.

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

69-1670 4

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),

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.

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.

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.

Fig. 10. Thermostat System and Fan key locations.

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.

Table 2. Default Program Settings.

M14880

Time Set Program

System

Fan

On Auto

Run

Program

Hold Temp

Set Current

Day/Time Wake Leave Return Sleep

Day Heat/Cool

Settings

Daylight

Time Copy

INCREASE TEMPERATURE

SETTING OR SCROLL

FORWARD THROUGH

INSTALLER SETUP OPTIONS

DECREASE TEMPERATURE

SETTING OR SCROLL

BACKWARD THROUGH

INSTALLER SETUP OPTION

DISPLAY INFORMATION

SUCH AS PRESENT

SETTINGS AND OUTDOOR

TEMPERATURE

RETURN TO

NORMAL

OPERATIONS

ENTER

INDEFINITE

OR TIMED

HOLD MODE

SET CURRENT

DAY AND TIME

SET CURRENT OR

PROGRAM DAY

CHANGE BETWEEN

DAYLIGHT SAVINGS

AND STANDARD TIME

NCREASE TIME SETTING

R SCROLL FORWARD

HROUGH INSTALLER SETUP

ND SYSTEM TEST

DECREASE TIME SETTING OR

SCROLL BACKWARD THROUGH

INSTALLER SETUP AND SYSTEM TEST

COPY ONE PROGRAMMED

DAY TO ANOTHER DAY

SET WAKE TIMES

AND SETPOINTS

CHANGE BETWEEN

HEATING AND COOLING

SETPOINTS

SET LEAVE TIMES

AND SETPOINTS SET RETURN TIMES

AND SETPOINTS

SET SLEEP TIMES

AND SETPOINTS

SYSTEM SWITCH

FAN SWITCH

Off CoolHeat

M14881

Hold Temp

Run

Program

Copy

Daylight

Time

Set Current

Day/Time

Time Set Program

Day

Wake Leave Return Sleep

Heat/Cool

Settings System

Fan

On Auto

Off CoolHeat

System

Fan

On Auto

Off Coo

Heat

Period 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

5 69-1670

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.

Fig. 11. Fan operation switch.

INSTALLER SETUP

NOTE: For most applications, the thermostat factory-

settings do not require changing. Review

factory settings in Table 3 and if no changes are

necessary, go to the Installer Self-Test section.

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.

A combination of key presses are required to use the

Installer Setup feature:

— To enter the installer setup, press and hold the

information ikey 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.

— 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.

Fig. 12. Display of all LCD segments.

Fig. 13. 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 com-

plete, review the settings to confirm that they

match the system.

M1267

FUEL SWITCH

M1901

Mon

Wake Leave Return Sleep Room

Wait

System

Hea

Coo

Hold for

Heat Cool

Repl Batt

Recovery

DST

Tue Wed Thu Fri Sat Sun

Days

Temporary Setting

Set Program Set Day/Time

M14618

INSTALLER SETUP

NUMBER DISPLAY

(COLUMN 2 OF TABLE 3)

FACTORY SETTING OR OTHER

CHOICE DISPLAY (COLUMN 3

OR 5 OF TABLE 3)

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

69-1670 6

Table 3. Thermostat Installer Setup Options.

Select

Installer Setup

Number (Press

Time ∆key to

change)

Factory Setting

Other Choices

(Press or key to change)

Actual

SettingDisplay Description Display Description

Not Used. 1 thru 3 — — — — —

Heating cycle

rate.

4 6 6—6 cph used for

conventional heat

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

Not Used. 5 thru 12 — — — — —

Adaptive

Intelligent

Recovery™

control.

13 0 Adaptive Intelligent

Recovery™

control is activated

(system starts

early so setpoint is

reached by start of

program period).

1 Conventional recovery

(system starts recovery at

programmed time).

—

Degree

temperature

display

14 0 Temperature is

displayed in °F

1 Temperature is displayed

in °C

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 32 — — — — —

Minimum off

time for the

compressor.

33 5 5 minute minimum

off time for the

compressor.

0 thru 4 Minimum number of minutes

(0 thru 5) the compressor is

off between calls for the

compressor.

Temperature

range stops in

heating.

34 90 Highest heating

setpoint setting.

40 to 89 Temperature range (1°F

increments) of heating

setpoint settings.

Temperature

range stops in

cooling.

35 45 Lowest cooling

setpoint setting.

46 to 99 Temperature range (1°F

increments) of cooling

setpoint settings.

Not Used. 36 — — — — —

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

7 69-1670

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.

Temperature

display

adjustment.

37 0 No difference in

displayed

temperature and

actual room

temperature.

3 thru -3 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.

Furnace Air

Filter Timer.

43 2 90 days (calendar

days)

0, 1, 3, 4 0 – off

1 – 30 days

3 – 180 days

4 – 365 days

(Time is counted by calendar

days in any mode.)

Humidifier Pad

Monitor.

44 0 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.

45 0 Off 1 1 – 365 days

(Time is counted by calendar

days in any mode.)

Table 3. Thermostat Installer Setup Options. (Continued)

Select

Installer Setup

Number (Press

Time ∆key to

change)

Factory Setting

Other Choices

(Press or key to change)

Actual

SettingDisplay Description Display Description

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

69-1670 8

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.

2. Press Day until the current day is displayed.

NOTE: Sun=Sunday, Mon=Monday,

Tue=Tuesday, Wed=Wednesday,

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

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

displayed.

NOTE: Tapping the Set Current Day/Time changes the

time in one hour increments.

NOTE: If the current time is Daylight Savings Time,

press Daylight Time until DST is displayed.

4. Press Run Program.

View or Reset Timer Settings

When the thermostat activates a timer, the thermostat

flashes Filter until the timer resets.

1. Reset the timer by pressing the ikey until the

expired timer is displayed.

2. Press the Time ∆key to reset the timer.

3. 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.

M1461

Time Set Program

System Fan

Run

Program

Hold Temp

Set Current

Day/Time

Set Current

Day/Time Wake Leave Return Sleep

Day Heat/Cool

Settings

Daylight

Time Copy

Set Day/Time

Mon

M1462

Time Set Program

System Fan

Run

Program

Hold Temp

Set Current

Day/Time Wake Leave Return Sleep

Day

Day Heat/Cool

Settings

Daylight

Time Copy

Set Day/Time

Tue

M1462

Time Set Program

System Fan

Run

Program

Hold Temp

Set Current

Day/Time Wake Leave Return Sleep

Day

Time

Heat/Cool

Settings

Daylight

Time Copy

Set Day/Time

Tue

M1462

Time Set Program

System Fan

Run

Program

Hold Temp

Set Current

Day/Time Wake Leave Return Sleep

Day Heat/Cool

Settings

Daylight

Time

Daylight

Time

Copy

Set Day/Time

DST

Tue

M1462

Time Set Program

System Fan

Run

Program

Run

Program Hold Temp

Set Current

Day/Time Wake Leave Return Sleep

Day Heat/Cool

Settings

Daylight

Time Copy Wake Room

System

Fan

Heat

Auto

DST

Tue

M2024

Filter Days

M2024

Filter Days

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

9 69-1670

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 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.

Fig. 14. Display of all LCD segments.

Fig. 15. 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.

Table 5. Installer System Test Options.

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.

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

Keyboard keys test.

M1901

Mon

Wake Leave Return Sleep Room

Wait

System

Hea

Coo

Hold for

Heat Cool

Repl Batt

Recovery

DST

Tue Wed Thu Fri Sat Sun

Days

Temporary Setting

Set Program Set Day/Time

M1461

Keys to

Press

Test

Number Description

Heating Equipment System Test

Time ∆10 Enter heating equipment system test.

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

10 Heat and system fan turn off.

Cooling Equipment System Test

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

31 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 2 Change from fan to key operation system test.

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

69-1670 10

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).

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.

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.

M1461

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