TRADELINE
T822D, TS822A
Heating Thermostats
— radiant heat from the sun, fireplaces, or appliances.
— concealed pipes and chimneys.
Application
— unheated (uncooled) areas behind the thermostat,
such as an outside wall.
The T882D two-wire, mercury switch thermostat pro-
vides low voltage control of heating systems and features
an adjustable heat anticipator. Some models include a
positive OFF switch and temperature range stops.
The TS822A two-wire, mercury switch thermostat pro-
vides millivoltage control of heating systems and features
a positive OFF switch.
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.
T822D and TS822A Thermostats are designed to be
mounted on a wall or on a vertical outlet box. In a 250 or
500 mV application, use No. 14 wire if possible and make
the run as short as possible; remember this when select-
ing a location. For maximum wire lengths in a 750 mV
application, see Table 1.
Recycling Notice
This control contains mercury in a sealed tube. Do not
place control in the trash at the end of its useful life.
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
this control, or of an old control containing mercury in a
sealed tube.
TABLE 1—WIRE LENGTH.
Max. Combined
Length
2-Single Wires
Wire
Size
Max. Length
2-Wire Cable
ft
[m]
ft
[m]
No. 18
No. 16
No. 14
30
50
80
[9.0]
60
[18.0]
[30.0]
[40.0]
[15.0]
[24.5]
100
160
Installation
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 4 for internal schematic and
typical hookup diagrams.
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 ship-
ping insert. This insert protects the switch and bimetal
assembly during shipping.
5. Set the adjustable heat anticipator indicator (T822D
only) to match the current draw of the primary heating
control (see Heat Anticipator Setting).
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to fol-
low 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
Disconnect power supply before beginning in-
stallation to prevent electrical shock or equip-
ment damage.
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.
Adjust the thermostat so it is approximately level and
start the second screw through the bottom mounting
hole. Do not tighten.
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.
J. H. • Rev. 2-93 •
• ©Honeywell Inc. 1993 • Form Number69-0509—2
M
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NOTE: The heat anticipator may require further adjust-
ment for best performance. To lengthen burner-on
time, move the indicator in the direction of the longer
arrows—not more than one-half scale marking at a
time. To shorten burner-on time, move indicator in
opposite direction.
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
leverindicatorreadapproximatelythesame, norecalibration
is needed.
If recalibration appears necessary, proceed as follows:
1. Place the temperature setting lever at the same setting
as the thermometer. Remove cover.
2. Insert104994ACalibrationWrench(orderseparately)
onto the hex nut under the foil. See Fig. 5. Holding the
setting lever so it does not move, turn the wrench clock-
Checkout
wise
wrench and replace cover.
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.
until the switch just breaks contact. Remove
CAUTION
Do not check thermostat operation by shorting
across system control terminals. This damages the
thermostat heat anticipator.
5. Remove cover. Holding the setting lever so it does
not move, reinsert wrench and carefully turn counterclock-
wise until the mercury just rolls to the left end of the
tube, but no farther.
6. Recheck calibration. Set thermostat system switch
for desired operation and replace cover.
1. Move temperature setting lever about 10° F [6° C]
above room temperature:
•
•
Gas or oil heating systems: Heating starts immedi-
ately. Fan starts after short delay.
Electric heating systems: Heating and fan start
immediately.
2. Move temperature setting lever about 10° F [6° C]
below room temperature:
Fig. 5—Recalibration procedure.
•
•
Gas or oil heating systems: Heating stops immedi-
ately. Fan stops after a short delay.
Electric heating systems: Heating and fan stop
immediately.
COIL SHOWN WITHOUT
HEAT ANTICIPATOR
RECALIBRATION
Thesethermostatsarecalibratedatthefactoryandshould
not need recalibration. If the thermostat seems out of ad-
justment, first check for accurate leveling. To check cali-
bration, proceed as follows:
1. Move the temperature setting lever to the low end of
the temperature scale.
CALIBRATION
WRENCH
M2044
2. Remove the thermostat cover. Move the setting lever
until the switch just makes contact. The mercury in the
switch will drop to the contact end of the tube.
3
69-0509—2
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Automation and Control Solutions
Honeywell International Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North
Golden Valley, MN 55422
35 Dynamic Drive
Scarborough, Ontario M1V 4Z9
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