Honeywell T8022D User Manual

T822A,D,F,G; TS822A; and T8022D

Low Voltage Thermostats

Application

T822A,D,F, TS822A, and T8022D Thermostats pro­vide control of heating systems. T822G provides control of
AC heating or cooling appliances.

The T822A two-wire switch thermostat provides low
voltage control of heating systems and features a fixed heat
anticipator.

The T822D and T8022D two-wire, mercury switch
thermostat provides low voltage control of heating systems
and features an adjustable heat anticipator.

The T822F three-wire, mercury switch thermostat pro­vides low voltage control of heating systems and features
an adjustable heat anticipator and AUTO-ON fan switch­ing.

The T822G three-wire, mercury switch thermostat pro­vides low voltage control of AC heating and cooling appli­ances and features an adjustable heating anticipator and
nonadjustable cooling anticipator.

The TS822A two-wire, mercury switch thermostat pro­vides millivoltage control of heating systems.

T822A,D; TS822A, and T8022D Thermostats are avail­able with a positive OFF switch. All models are available
with temperature range stops.

Recycling Notice

M3375

If this control is replacing a control that contains mer­cury in a sealed tube, do not place your old control in
thetrash.

Contact your local waste management authority for
instructions regarding recycling and the proper disposal of
this control, or of an old control containing mercury in a
sealed tube.

If you have questions, call Honeywell Inc. at
1-800-468-1502.

Installation

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to follow
them could 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 installation is complete, check out product
operation as provided in these Instructions.

CAUTION

CAUTION

Disconnect power supply before beginning instal­lation to prevent electrical shock or equipment
damage.

LOCATION

Locate the thermostat about 5 ft [1.5 m] above the floor
on an inside wall in an area with good air circulation at
average temperature.

Do not mount the thermostat where it can be affected by:

— drafts or dead spots behind doors or in corners.

— hot or cold air from ducts.

— concealed pipes and chimneys.

— radiant heat from the sun, fireplaces, or appliances.

— unheated (uncooled) areas behind the thermostat,

such as an outside wall.

MOUNTING AND WIRING

Disconnect power supply before beginning installation
to prevent electrical shock or equipment damage.

All wiring must comply with local codes and ordi­nances.

T822A,D,F,G and TS822A Thermostats are designed to
be mounted vertically on a wall or a vertical outlet box.
T8022D is designed to be mounted horizontally on a wall.

In a 250 or 500 mV application, use No. 14 wire if
possible and make the run as short as possible; remember
this when selecting a location. For maximum wire lengths
of a 750 mV application, see Table 1.

TABLE 1—WIRE LENGTH.

Max. Combined
Wire Max. Length Length
Size 2-Wire Cable 2-Single Wires

ft m ft m
No. 18 30 9.0 60 18.0
No. 16 50 15.0 100 30.0
No. 14 80 24.5 160 40.0

1. In replacement applications, check the existing ther-

mostat wires for cracked or frayed insulation. Replace any
wires in poor condition. If the wire is plastered into the
wall, make a hole next to the wires and loosen the wires so
they can be pushed back into the wall later.

2. In new installations, run wiring (if necessary) to the

thermostat location.

3. Connect the wires to the terminals on the back of the

thermostat. See Figs. 1 through 6 for internal schematics
and typical hookup diagrams.

J. H. • Rev. 2-01 • • ©Honeywell Inc. 2001 • Form Number 69-0510—4

1 69-0510—4

M3375

4. Remove thermostat cover by pulling outward on
bottom edge of cover until it snaps free of the thermostat
base. Carefully remove and discard the foam plastic ship­ping insert. This insert protects the switch and bimetal
assembly during shipping.

5. Set the adjustable heat anticipator indicator
(T822D,F,G only) to match the current draw of the primary
heating control (see Heat Anticipator Setting).

6. Push excess wire back through the hole and plug any
opening with insulation to prevent drafts that may affect
thermostat performance.

7. Loosely fasten the thermostat to the wall or outlet
box with a screw through the top mounting hole. Do not
tighten.

8. Level the thermostat exactly using a spirit level or
plumb line. Tighten the mounting screws.

IMPORTANT: An incorrectly leveled thermostat will

cause the temperature control to deviate from setpoint.

9. Replace the thermostat cover.

Fig. 1—T822A,D and T8022D in typical electric
heating application.

T822A,D; T8022D

TEMP. FALL

H1

3

H1
ANTICIPATOR

1

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

2

ALTERNATE LIMIT CONTROL LOCATION.

3

T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A
HAS A FIXED HEAT ANTICIPATOR.

Fig. 2—T822A,D and T8022D in typical gas
heating application.

T822A,D; T8022D

TEMP. FALL

H1

2

H1
ANTICIPATOR

1

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

T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR. T822A HAS A

2

FIXED HEAT ANTICIPATOR.

LIMIT
CONTROL

R

W

ELECTRIC
HEAT RELAY

R

W

GAS
CONTROL

1

2

L1
(HOT)

L2

M1164B

1
L1
(HOT)

L2

M1183A

Fig. 3—T822A,D and T8022D in typical oil
heating application.

T822A,D; T8022D

TEMP. FALL

R

H1

2

1

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

2

T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A
HAS A FIXED HEAT ANTICIPATOR.

W

H1
ANTICIPATOR

T

T

OIL
PRIMARY

Fig. 4—T822F in typical heating application.

L1
(HOT)

T822F

TEMP. FALL

H1

H1
ANTICIPATOR

1

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

Fig. 5—T822G in typical heating or cooling
application.

T822G

TEMP. FALL

H1

H1
ANTICIPATOR

1

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

2

USE EITHER "W" OR "Y" TERMINAL, BUT NOT BOTH.

FAN
SWITCH

ON

AUTO

C1

R

C1
ANTICIPATOR

Y

2

W

R

G

W

FAN RELAY

HEAT RELAY

L1
(HOT)

COOL RELAY

HEAT RELAY

M1184A

1

L2

M5538

L2

M5512

L1
(HOT)

L2

1

1

2