Honeywell T822A Thermostat User Manual

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

Low Voltage Thermostats

Application

T822A,D,F, TS822A, and T8022D Thermostats pro-

vide control of heating systems. T822G provides control of

AC heating or cooling appliances.

CAUTION

Disconnect power supply before beginning instal-

lation to prevent electrical shock or equipment

damage.

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 pro-

vides low voltage control of heating systems and features

an adjustable heat anticipator and AUTO-ON fan switch-

ing.

The T822G three-wire, mercury switch thermostat pro-

vides low voltage control of AC heating and cooling appli-

ances and features an adjustable heating anticipator and

nonadjustable cooling anticipator.

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

The TS822A two-wire, mercury switch thermostat pro-

vides millivoltage control of heating systems.

T822A,D; TS822A, and T8022D Thermostats are avail-

able with a positive OFF switch. All models are available

with temperature range stops.

Disconnect power supply before beginning installation

to prevent electrical shock or equipment damage.

All wiring must comply with local codes and ordi-

nances.

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.

M3375

Recycling Notice

If this control is replacing a control that contains mer-

cury 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.

TABLE 1—WIRE LENGTH.

Max. Combined

Wire

Size

Max. Length

2-Wire Cable

Length

If you have questions, call Honeywell Inc. at

-800-468-1502.

2-Single Wires

9.0

15.0

24.5

100

160

No. 18

No. 16

No. 14

18.0

30.0

40.0

Installation

WHEN INSTALLING THIS PRODUCT…

. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazardous condi-

tion.

. 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. 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 tech-

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

thermostat location.

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

nician.

4. After installation is complete, check out product

operation as provided in these Instructions.

thermostat. See Figs. 1 through 6 for internal schematics

and typical hookup diagrams.

CAUTION

J. H. • Rev. 2-01 •1

• ©Honeywell Inc. 2001 • Form Number 66 99 - -00 55 11 00 —— 44

M3375

. 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 ship-

ping insert. This insert protects the switch and bimetal

assembly during shipping.

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

heating application.

T822A,D; T8022D

TEMP. FALL

. Set the adjustable heat anticipator indicator

T822D,F,G only) to match the current draw of the primary

heating control (see Heat Anticipator Setting).

. Push excess wire back through the hole and plug any

(

(HOT)

opening with insulation to prevent drafts that may affect

thermostat performance.

OIL

PRIMARY

7. Loosely fasten the thermostat to the wall or outlet

ANTICIPATOR

box with a screw through the top mounting hole. Do not

tighten.

. Level the thermostat exactly using a spirit level or

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

plumb line. Tighten the mounting screws.

T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A

IMPORTANT: An incorrectly leveled thermostat will

HAS A FIXED HEAT ANTICIPATOR.

M1184A

causethetemperaturecontroltodeviatefromsetpoint.

9. Replace the thermostat cover.

Fig. 4—T822F in typical heating application.

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

heating application.

(

HOT) L2

T822A,D; T8022D

T822F

TEMP. FALL

LIMIT

CONTROL

TEMP. FALL

FAN

SWITCH

(HOT)

AUTO

FAN RELAY

ANTICIPATOR

ELECTRIC

HEAT RELAY

ANTICIPATOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

HEAT RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

ALTERNATE LIMIT CONTROL LOCATION.

PROTECTION AS REQUIRED.

M5538

T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A

HAS A FIXED HEAT ANTICIPATOR.

M1164B

Fig. 5—T822G in typical heating or cooling

application.

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

heating application.

HOT) L2

(

T822A,D; T8022D

TEMP. FALL

T822G

TEMP. FALL

(HOT)

ANTICIPATOR

COOL RELAY

HEAT RELAY

GAS

CONTROL

ANTICIPATOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR. T822A HAS A

FIXED HEAT ANTICIPATOR.

M1183A

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

M5512

. Turn the system switch to OFF, and turn off power.

0. Adjust the heat anticipator to match the reading on

the ammeter.

1. Disconnect the ammeter, reconnect the W wire, and

mount the thermostat. Continue with system checkout.

NOTE: For best performance, the heat anticipator may

require further adjustment. To lengthen burner-on time,

move the indicator in the direction of the longer ar-

rows—not more than one-half scale marking at a time.

To shorten burner-on time, move indicator in opposite

direction.

Fig. 6—TS822A in typical millivoltage heating

application.

TS822A

TEMP. FALL

PILOTSTAT

MILLIVOLTAGE CONTROL

GAS CONTROL (IF USED)

TH/

MILLIVOLTAGE

GENERATOR

LIMIT

CONTROL

Checkout

CAUTION

CONNECT R AND W TERMINALS FOR 750 mV SYSTEMS. CONNECT

R AND Y TERMINALS FOR 250/500 mV SYTSEMS.

M1294

CAUTION

Do not check thermostat operation by shorting

across system control terminals. This damages the

thermostat heat anticipator.

Setting and Adjustment

TEMPERATURE SETTING

IMPORTANT: The T822A,D,F, TS822A, and T8022D

can only be installed in heating applications. Per-

form only steps 1 and 2. The T822G can be installed

for either heating or cooling applications. If installed

for heating, perform steps 1 and 2. If installed for

cooling, perform step 6.

Move the temperature setting lever to the desired control

point on the temperature scale. On positive off models, the

control circuit is broken when the lever is moved to the

extreme low end of the temperature scale. On models with

temperature range stops, move the temperature setting le-

ver only between the two temperature range stops.

. Set T822F FAN switch to AUTO. Fan operation is

HEAT ANTICIPATOR SETTING (T822D,F,G

ONLY)

controlled by the thermostat.

2. Move temperature setting lever about 10° F [6° C]

above room temperature.

NOTE: Before Changing your heat anticipator setting,

consultyourinstallingcontractororequipmentmanu-

facturer. Heat anticipators on some models are fac-

tory set to the manufacturer's specifications.

•

Gas or oil heating systems: heating starts immedi-

ately. Fan starts after short delay.

Electric heating systems: heating and fan start imme-

diately.

•

. Move temperature setting lever about 10° F [6° C]

IMPORTANT: The T822D,F,G has an adjustable heat

anticipator and operates properly ONLY IF THE

ANTICIPATOR IS ADJUSTED TO MATCH THE

CURRENT DRAW OF THE PRIMARY CONTROL.

Use the T822D,F,G only on systems with current

draws that fall within the range of the heat anticipa-

tor. Do not use this device on Powerpile (millivolt)

Systems.

below room temperature.

•

Gas or oil heating systems: heating stops immedi-

ately. Fan stops after a short delay.

Electric heating systems: heating and fan stop imme-

diately.

4. Set T822F FAN switch to ON. Fan runs continu-

ously.

5. Set temperature lever and T822F FAN switch to the

desired settings.

A current rating is usually stamped in the nameplate of

the primary control. Set the adjustable heat anticipator

indicator to match the value given on the nameplate.

If current rating is not available, proceed as follows to

determine the rating:

CAUTION

Do not operate T822G in cooling applications if

the outdoor temperature is below 50° F [10° C].

Refer to the air conditioner manufacturer’s

recommendations.

. Turn off power.

2. Wirethermostat, exceptforconnectiontoWterminal,

but do not mount it on the wall.

. ConnecttheammeterbetweenWwireandWterminal

on the thermostat in series with the primary control.

. T822G COOLING APPLICATIONS ONLY:

. Prepare the system for operation.

. Turn on power.

. Turn system switch to heat.

. Increasethermostatsetpointasnecessarytogetsystem

NOTE: To prevent compressor short cycling, install a five

minute time delay. The time delay will not activate the

compressor for five minutes after the thermostat turns

off the compressor or for five minutes after the system

receives power.

operating.

8. With the system operating through the ammeter, wait

one minute, then read the ammeter.

69-0510—4

Move the temperature setting lever about 10° F [6° C]

below room temperature. Cooling and fan should start

immediately. Move temperature setting lever about 10° F

3. Move the setting lever to a low setting. Wait at least

five minutes for temperature to stabilize.

4. Slowly move the setting lever until it reads the same

as the thermometer.

[

6° C] above room temperature. Cooling and fan should

stop immediately.

5. Remove cover. Holding the setting lever so it does

not move, reinsert wrench and carefully turn counter-

until the mercury just rolls to the left end

of the tube, but no farther.

RECALIBRATION

clockwise

Thesethermostatsarecalibratedatthefactoryandshould

not need recalibration. If the thermostat seems out of ad-

justment, first check for accurate leveling. To check cali-

bration, proceed as follows:

6. Recheck calibration. Set thermostat system switch

for desired operation and replace the cover.

. Move the temperature setting lever to the low end of

the temperature scale.

. Remove the thermostat cover. Move the setting lever

Fig. 7—Recalibration procedure.

until the switch just makes contact. The mercury in the

switch will drop to the contact end of the tube.

COIL SHOWN WITHOUT

HEAT ANTICIPATOR

3. Replace the cover and wait five minutes for the cover

and the thermostat to lose the heat it has gained from your

hands. If the thermometer pointer and the setting lever

indicator read approximately the same, no recalibration is

needed.

If recalibration appears necessary, proceed as follows:

. Place the temperature setting lever at the same setting

as the thermometer. Remove cover.

. Insert104994ACalibrationWrench(orderseparately)

CALIBRATION

WRENCH

M2044

onto the hex nut under the coil. See Fig. 7. Holding the

setting lever so it does not move, turn the wrench clock-

wise

until the switch just breaks contact.

Remove wrench and replace cover.

Automation and Control Solutions

Honeywell Internationals Inc.

Honeywell Limited—Honeywell Limitée

985 Douglas Drive North

35 Dynamic Drive

Golden Valley, Minnesota 55422

Scarborough, Ontario M1V 4Z9

www.honeywell.com/yourhome

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