TRADELINE
T822D, TS822A
Heating Thermostats
Application
The T882D two-wire, mercury switch thermostat provides 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 provides millivoltage control of heating systems and features a positive OFF switch.
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.
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
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.
—radiant heat from the sun, fireplaces, or appliances.
—concealed pipes and chimneys.
—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. 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 selecting a location. For maximum wire lengths in a 750 mV
application, see Table 1.
TABLE 1—WIRE LENGTH.
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Max. Combined |
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Wire |
Max. Length |
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Length |
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Size |
2-Wire Cable |
2-Single Wires |
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ft |
[m] |
ft |
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[m] |
No. 18 |
30 |
[9.0] |
60 |
|
[18.0] |
No. 16 |
50 |
[15.0] |
100 |
|
[30.0] |
No. 14 |
80 |
[24.5] |
160 |
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[40.0] |
|
|
|
|
|
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1.In replacement applications, check the existing thermostat 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 shipping 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).
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.
J. H. • Rev. 2-93 • 1 • ©Honeywell Inc. 1993 • Form Number69--0509—2
8. Level the thermostat exactly using a spirit level or plumb line. Tighten the mounting screws.
IMPORTANT: An incorrectly leveled thermostat will causethetemperaturecontroltodeviatefromsetpoint.
9. Replace the thermostat cover
Settings andAdjustments
TEMPERATURE SETTING
Movethetemperaturesettinglevertothedesiredcontrol 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, temperature setting lever can be moved only between the two temperature range stops.
HEAT ANTICIPATOR SETTING (T822D Only)
IMPORTANT: This thermostat has an adjustable heat anticipator and will operate properly ONLY IF THE ANTICIPATOR IS ADJUSTED TO MATCH THE CURRENT DRAW OF THE PRIMARY CONTROL. Use this thermostat only on systems with current draws that fall within the range of the heat anticipator. Do not use device on Powerpile (millivolt) Systems.
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:
1.Turn off power.
2.Wire thermostat, except for connection to W terminal, but do not mount it on the wall.
3.Connect ammeter between W wire and W terminal on the thermostat.
4.Prepare the system for operation.
5.Turn on power.
6.Turn system switch to heat.
7.Increase thermostat setpoint as necessary to get system operating.
Fig. 1—T822D in typical electric heating application.
T822A,D; T8022D
TEMP. FALL |
LIMIT |
|
CONTROL |
|
R |
H1 |
|
3 
W 
H1
ANTICIPATOR ELECTRIC HEAT RELAY
21
L1
(HOT) 
L2
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 ALTERNATE LIMIT CONTROL LOCATION.
3T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A HAS A FIXED HEAT ANTICIPATOR.
M1164B
Fig. 2—T822D in typical gas heating application.
T822A,D; T8022D |
|
TEMP. FALL |
1 |
|
|
R |
L1 |
(HOT) |
|
H1 |
L2 |
|
W 
2
H1
ANTICIPATOR GAS CONTROL
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR. T822A HAS A
FIXED HEAT ANTICIPATOR. |
M1183A |
|
Fig. 3—T822D in typical oil heating application.
T822A,D; T8022D
TEMP. FALL
|
|
1 |
R |
T |
L1 |
(HOT) |
||
|
T |
L2 |
H1
OIL
PRIMARY
W 
2
H1 
ANTICIPATOR
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A HAS A FIXED HEAT ANTICIPATOR.
M1184A
Fig. 4—TS822A in typical millivoltage heating application.
TS822A |
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PILOTSTAT |
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TEMP. FALL |
MILLIVOLTAGE |
CONTROL |
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GAS CONTROL |
(IF USED) |
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2 |
|||
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R |
TH |
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TH/ |
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|
PP |
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|
H1 |
PP |
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1MILLIVOLTAGE
GENERATOR
Y
LIMIT
W 
CONTROL
1 CONNECT R AND W TERMINALS FOR 750 mV SYSTEMS. CONNECT R AND Y TERMINALS FOR 250/500 mV SYSTEMS.
2POSITIVE OFF SWITCH PROVIDES COMPLETE CONTROL CIRCUIT SHUTOFF. DOES NOT REPLACE POWER SUPPLY DISCONNECT SWITCH.
M1311
8.With the system operating through the ammeter, wait one minute, then read the ammeter.
9.Turn the system switch to OFF, and turn off power.
10.Adjust the heat anticipator to match the reading on the ammeter.
11.Disconnect the ammeter, reconnect the W wire, and mount the thermostat. Continue with system checkout.
2
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