Honeywell T8601D User Manual

T8601D Chronotherm® IV Deluxe

Programmable Thermostats

INSTALLATION INSTRUCTIONS

APPLICATION

The T8601 Chronotherm® IV Deluxe Programmable
Thermostat provides electronic control of 24 Vac single-

Table 1. Description of T8601 Thermostats.

T8601 System Changeover System Selection Fan Selection Comments

D Heat-Cool Automatic Heat-Off-Cool-Auto On-Auto Use keyboard for system and fan selections

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.

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.

stage heating and cooling systems. Refer to Table 1 for a
general description of the thermostat. All T8601
thermostats require a common wire to supply power.

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.

® U.S. Registered Trademark
Copyright © 2002 Honeywell • •All Rights Reserved

69-1410-2

T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

NO

NO

[1.5 METERS]

Fig. 1. Typical location of thermostat.

Wallplate Installation

The thermostat can be mounted horizontally on the wall
or on a 2 in. x 4 in. wiring box. Position wallplate
horizontally on the wall or on a 2 in. x 4 in. wiring box.

1. Position and level the wallplate (for appearance
only). The thermostat functions correctly even
when not level.

WIRES
THROUGH WALL

WALL
ANCHORS (2)

Fig. 2. Mounting the wallplate.

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

Fig. 2.

WALL

MOUNTING
HOLES

MOUNTING
SCREWS

M15044

YES

5 FEET

NO

M10106

3. Remove the wallplate from the wall and drill two
3/16 in. holes in the wall (if drywall) as marked. For
firmer material such as plaster, drill two 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.

WIRING

All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 through 5 for typical hookups.
A letter code is located near each terminal for
identification.

CAUTION

Electrical Hazard.
Can cause electric shock and equipment
damage.

Disconnect power before beginning wiring.

1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 6.

THERMOSTAT

GC

FAN
RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

1

OVERLOAD PROTECTION AS REQUIRED.

Fig. 3. Typical hookup in heat only application.

HEAT
RELAY

RW

TRANSFORMER

L1
(HOT)

L2

1

M10357

69-1410—2 2

T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

THERMOSTAT

C

YG

COMPRESSOR
CONTACTOR

1

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

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT

2

PUMP SYSTEMS.

3

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

Fig. 4. Typical hookup in heat and cool

THERMOSTAT

RC

YG

2

COMPRESSOR
CONTACTOR

1

L1
(HOT)
L2

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

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT
PUMP SYSTEMS.

4

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

Fig. 5. Typical hookup in heat and cool

O

FAN
RELAY

COOL
DAMPER

B

2

HEAT
DAMPER

HEAT
RELAY

2

RW

TRANSFORMER

system with one transformer.

O

BC

3

HEAT
DAMPER

HEAT
RELAY

HEATING TRANSFORMER

COOL
DAMPER

FAN
RELAY

3

system with two transformers.

RW

OTOT

3

OUTDOOR
TEMPERATURE
SENSOR

L1
(HOT)

L2

4

OUTDOOR
TEMPERATURE
SENSOR

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

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

Fig. 6. Proper wiring technique.

Mounting Thermostat

1

M10353

OTOT

L1
(HOT)

L2

M10354

1. Engage tabs at the top of the thermostat and wall­plate. See Fig. 7.

2. Press lower edge of case to close and latch.

NOTES: 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.

1

B.

PRESS LOWER
EDGE OF CASE
TO LATCH.

Fig. 7. Mounting thermostat on wallplate.

M4826

M14628

3 69-1410—2

T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

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,

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

SET LEAVE TIMES
AND SETPOINTS

Time Set Program

Heat/Cool

Copy

Fig. 8. T8601D 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. 9. 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.

• configure Installer Setup,

• check Self-Test,

• display outdoor temperature (select models),

• set the system operation,

• set the fan operation.

See Fig. 8 for the location of the keys.

SET RETURN TIMES
AND SETPOINTS

Leave

Wake

Settings

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

Return Sleep

System Fan

Run

Set Current

Program

Hold Temp

Day

Day/Time

Daylight

Time

Time Set Program

Copy

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

Fig. 9. Thermostat System and Fan key locations.

NOTE: Always press the keys with your fingertip or

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

M14624

System

Fan

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