Honeywell Thermostat TS822A User Manual

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 Number69-05092  
M
 
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  
 
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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