Honeywell T8602C User Manual

T8602C Chronotherm

Deluxe Programmable Thermostats

INSTALLATION INSTRUCTIONS

APPLICATION

The T8602 Chronotherm® IV Deluxe Programmable
Thermostat provides electronic control of 24 Vac single­stage heating and cooling systems. Refer to Table 1 for

Table 1. Description of T8602 Thermostats.

T8602 System Changeover

C Heat-Cool Manual Heat-Off-Cool On-Auto System and fan selections are done by

System

Selection

a general description of the thermostat. All T8602
thermostats are powered by batteries.

Fan

Selection Comments

keyboard.

®

IV

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 thermostat.

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 1.5m (5 ft) 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 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.

1. Position and level the wallplate (for appearance

only). The thermostat will function properly even
when not level.

®U.S. Registered Trademark
Copyright © 2001 Honeywell • • All Rights Reserved

69-1567

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

NO

WIRES
THROUGH WALL

WALL
ANCHORS
(2)

Fig. 2. Mounting the wallplate.

YES

NO

1.5 METERS
(5 FEET)

Fig. 1. Typical location of thermostat.

2. Use a pencil to mark the mounting holes. See Fig. 2.

WALL

3. Remove the wallplate from the wall and drill two

4.76 mm (3/16 inch) holes in the wall (if drywall)
as marked. For firmer material such as plaster,
drill two 5.56 mm (7/32 inch) 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.

WIRING

All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 for typical hookup. A letter

MOUNTING
HOLES

MOUNTING
SCREWS

M15044

code is located near each terminal for identification.

CAUTION

Disconnect power before wiring to prevent
electrical shock or equipment damage.

1. Loosen the terminal screws on the wallplate and

connect the system wires. See Fig. 4.

IMPORTANT

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.

NO

M10856

Use 18 gauge, color-coded thermostat cable
for proper wiring.

69-1567

2

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT

YG

RC

2

COMPRESSOR
CONTACTOR

FAN
RELAY

L1
(HOT)

L2

1

COOLING
TRANSFORMER

1

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

JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A

2

ONE TRANSFORMER SYSTEM.

3

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

Fig. 3. Typical hookup in heat and cool

system with two transformers.

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

HEAT
RELAY

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

RW

Fig. 4. Proper wiring technique.

OTOT

3

OUTDOOR
TEMPERATURE
SENSOR

1

HEATING
TRANSFORMER

M10855

M4826

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.

L1
(HOT)

L2

A.

ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.

B.

PRESS LOWER
EDGE OF CASE
TO LATCH.

Fig. 5. Mounting thermostat on wallplate.

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.

M14628

3

69-1567

T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

See Fig. 6 for the location of the keys.

INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER SETUP
AND 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

SET LEAVE TIMES
AND SETPOINTS

Time Set Program

Wake

Heat/Cool

Settings

Copy

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

SET RETURN TIMES
AND SETPOINTS

Leave

Return Sleep

System Fan

Fig. 6. T8602C 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. 7. The fan settings can be set for
each program period individually. The system selection
is for all the program periods.

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.

Fan settings control the system fan as follows:

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

Program

Hold Temp

Fig. 7. Thermostat System and Fan key locations.

NOTE: Always press the keys with your fingertip or

Time Set Program

Run

Set Current

Day/Time

Day

Daylight

Copy

Time

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

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

Leave

Wake

Return

Heat/Cool

System Fan

Settings

Sleep

M14625

M14624

System

Fan

69-1567

4