Honeywell TS822A, T822D User Manual
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
M3375
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.
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 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 • • ©Honeywell Inc. 1993 • Form Number 69-0509—2
1 69-0509—2
M3375
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. 2—T822D in typical gas heating application.
T822A,D; T8022D
TEMP. FALL
R
H1
L1
(HOT)
L2
1
Settings and Adjustments
TEMPERATURE SETTING
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, 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 termi-
nal, 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 sys-
tem operating.
Fig. 1—T822D 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.
R
W
LIMIT
CONTROL
ELECTRIC
HEAT RELAY
1
2
L1
(HOT)
L2
M1164B
2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
T822D, T8022D ADJUSTABLE HEAT ANTICIPATOR. T822A HAS A
2
FIXED HEAT ANTICIPATOR.
W
H1
ANTICIPATOR
GAS
CONTROL
M1183A
Fig. 3—T822D in typical oil heating application.
T822A,D; T8022D
TEMP. FALL
R
H1
H1
ANTICIPATOR
2
1
W
R
Y
W
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.
Fig. 4—TS822A in typical millivoltage heating
application.
TS822A
TEMP. FALL
H1
1
CONNECT R AND W TERMINALS FOR 750 mV SYSTEMS. CONNECT
R AND Y TERMINALS FOR 250/500 mV SYSTEMS.
2
POSITIVE OFF SWITCH PROVIDES COMPLETE CONTROL CIRCUIT
SHUTOFF. DOES NOT REPLACE POWER SUPPLY DISCONNECT
SWITCH.
T
T
OIL
PRIMARY
MILLIVOLTAGE
GAS CONTROL
TH
TH/
PP
PP
LIMIT
CONTROL
PILOTSTAT
CONTROL
(IF USED)
L1
(HOT)
L2
M1184A
MILLIVOLTAGE
GENERATOR
M1311
1
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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