Honeywell T8602D User Manual

4

APPLICATION

T8602D Chronotherm® IV

Programmable Thermostats

INSTALLATION INSTRUCTIONS

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

Table 1. Description of T8602 Thermostats.

T8602 System Changeover

D Heat-Cool Manual or

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.

Automatic

Selectable

System

Selection

Heat-Off-Cool or

Heat-Off-Cool-Auto

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.

cooling. Refer to Table 1 for a general description of the
thermostat. All T8602 Thermostats are powered by
batteries.

Fan

Selection Comments

On-Auto System and fan selections are done

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.

by keyboard.

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.

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

2.

3. 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.

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 © 2003 Honeywell International Inc. • • All Rights Reserved

69-1510-

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

)

L
(

L

NO

Fig. 1. Typical location of thermostat.

WALL

WALL
ANCHORS (2)

WIRES
THROUGH WALL

Fig. 2. Mounting the wallplate.

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.

CAUTION

Electrical Hazard.
Can cause electrical shock or equipment
damage.

Disconnect power before wiring.

NO

MOUNTING
HOLES

MOUNTING
SCREWS

M15044

YES

1.5 METERS
(5 FEET)

1. Loosen the terminal screws on the wallplate and

IMPORTANT

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole.

4. Plug the hole with nonflammable insulation to pre-

RC

1

HOT)

2

1

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.

NO

M10856

connect the system wires. See Fig. 7.

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

vent drafts from affecting the thermostat.

THERMOSTAT

YG

2

COMPRESSOR
CONTACTOR

FAN
RELAY

COOLING
TRANSFORMER

Fig. 3. Typical hookup in heat and cool

system with two transformers.

HEAT
RELAY

RW

HEATING
TRANSFORMER

OUTDOOR
TEMPERATURE
SENSOR

OTOT

3

1

L1
(HOT

L2

M10855

69-1510-4 2

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

)

M10347A

L

M
G

M
G

6

F
I
7

8

B

THERMOSTAT

O

YG

COMPRESSOR
CONTACTOR

1

2

3

COOL
DAMPER

FAN
RELAY

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.

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

PILOTSTAT
CONTROL
(IF USED)

ILLIVOLTAGE
ENERATOR

B

HEAT

2

RELAY

HEAT
DAMPER

2

one transformer.

TH

TH/

PP

PP

MILLIVOLTAGE
GAS CONTROL

RC

RW

MILLIVOLT HEATING-ONLY
WALLPLATE

3

OUTDOOR
TEMPERATURE
SENSOR

TRANSFORMER

W

R

LIMIT
CONTRO

M2931

OTOT

1

L1
(HOT

L2

Fig. 5. Typical hookup in millivoltage heating circuit.

MILLIVOLT HEATING-24Vac

PILOTSTAT
CONTROL
(IF USED)

TH

TH/

PP

ILLIVOLTAGE
ENERATOR

1

L1
(HOT)

L2

1

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

Fig. 6. Typical hookup in millvoltage heating and

OR WRAPAROUND

NSERTION STRIP

/16 IN. (11 MM).

PP

MILLIVOLTAGE
GAS CONTROL

24 Vac cooling circuit.

COOLING WALLPLATE

G

W

LIMIT
CONTROL

FAN
RELAY

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

RC Y O

R

CHANGEOVER
RELAY

COOLING
CONTACTOR

M2942

M482

Fig. 7. Correct wiring technique.

Mounting Thermostat

1. Engage tabs at the top of the thermostat and wall-

plate. See Fig. 7.

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.

.

PRESS LOWER
EDGE OF CASE
TO LATCH.

M1462

Fig. 8. Mounting thermostat on wallplate.

3 69-1510-4

T8602D CHRONOTHERM® IV PROGRAMMABLE THERMOSTATS

S

I
O
T
A

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,

NCREASE TIME SETTING

R SCROLL FORWARD
HROUGH 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. 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.

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.

Fan settings control the system fan as follows:

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

• 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.

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

Run

Program

Hold Temp

Fig. 10. Thermostat System and Fan key locations.

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

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

Leave

Wake

SET SLEEP TIMES
AND SETPOINTS

SELECT FAN
OPERATION

SELECT SYSTEM
OPERATION

CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS

Sleep

Return

System Fan

M14625

M14624

System

Fan

Return Sleep

System Fan

Time Set Program

Set Current
Day/Time

Heat/Cool

Day

Settings

Daylight

Copy

Time

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

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