T822, TS822
Heating/Cooling Thermostats
PRODUCT DATA
FEATURES
• T822A, D, F and TS822A control heating systems.
• T822C, E control cooling systems.
• T822G controls heating or cooling systems.
• T822F provides Auto-On System switching.
• T822D, F, G heating anticipators are adjustable.
• T822A and TS822A heating anticipators are not
adjustable.
• T822C, F, G cooling anticipators are not adjustable.
• Coiled bimetal operates quiet, dust-free mercury
switch.
• All wiring connections are made on back of
thermostat.
• All models are mounted directly on wall or on standard
vertical outlet box.
• T822A, C, D and TS822A are available with positive Off.
• All models have vented covers for better air flow and
improved temperature sensing.
APPLICATION
T822 models provide low voltage (millivoltage) control of
heating or cooling systems.
® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc.
All Rights Reserved
Contents
Application.........................................................................1
Features ............................................................................1
Specifications ....................................................................2
Ordering Information .........................................................2
Installation .........................................................................3
Settings and Adjustments..................................................5
Checkout ...........................................................................6
68-0095-2
T822, TS822 HEATING/COOLING THERMOSTATS
SPECIFICATIONS
The specifications given in this publication do not include
normal manufacturing tolerances. Therefore, this unit may not
exactly match the listed specifications. Also, this product is
tested and calibrated under closely controlled conditions, and
some minor differences in performance can be expected if
those conditions are changed.
TRADELINE® MODELS
TRADELINE® models are selected and packaged for ease of
handling, ease of stocking, and maximum replacement value.
TRADELINE® specifications are the same as those of
standard models except as follows:
Tradeline Models Available:
T822D Heating Thermostat used for low voltage heating appli-
cations with adjustable heat anticipator.
TS822A Heating Thermostat used for 250/500 and 750 mV
applications with nonadjustable heat anticipator.
Additional Features:
• T822D and TS822A available with positive Off.
• T822D models available with heat anticipator factory set at
0.2A for electric heat applications.
• Temperature range stops available on some TRADELINE
models.
STANDARD MODELS
Standard Models Available:
T822A Heating Thermostat used in low voltage heating appli-
cations. Nonadjustable heating anticipator.
T822C Cooling Thermostat used in low voltage cooling appli-
cations. Nonadjustable cooling anticipator.
T822D Heating Thermostat used in low voltage heating appli-
cations. Adjustable heat anticipator.
T822F Heating Thermostat used in low voltage heating appli-
cations. Adjustable heat anticipator and On-Auto Fan
switching.
T822G Heating or Cooling Thermostat used in low voltage
heating or cooling applications. Works with series 20
heating applications. Adjustable heat anticipator.
Nonadjustable cooling anticipator.
TS822A Heating Thermostat used in millivoltage heating
applications.
Electrical Ratings:
T822A: 0 to 1.2A at 30 Vac; 1.5A at 24 Vdc.
T822C: 1.0A running, 5.0A inrush at 25 Vac.
T822D,F,G: 0.18 to 0.8A at 30 Vac/Vdc.
TS822A: 0.1A at 250/500 and 750 mV.
Anticipator Ratings:
T822A: Nonadjustable. Factory set from 0 to 0.4A.
T822C: Nonadjustable. Factory set from 0 to 1.0A.
T822D: Adjustable from 0.18 to 1.0A or 0.3 to 1.2A.
T822F: Adjustable from o.18 to 1.0A.
T822G:
Heating Anticipator: Adjustable from 0.18 to 1.0A.
Cooling Anticipator: Nonadjustable. Factory set from 0 to
1.0A.
Switching:
Heating Thermostats: Spst mercury switch makes R to W on
temperature fall.
Cooling Thermostats: Spst mercury switch makes R to Y on
temperature rise.
Temperature Setting Range (Specify When Ordering):
Standard Heating Models: 55° F to 95°F (13°C to 35 °C).
Positive Off Heating Models: 60° F to 95°F (16°C to 35°C).
Standard Cooling Models: 55° F to 95°F (13 °C to 35°C).
Positive Off Cooling Models: 55° F to 85°F.13°C to 29°C).
Dimensions: See Fig. 1.
Mounting Means: Two screws through thermostat mounting
holes to wall or vertical or horizontal mounting box.
Optional Specifications:
Positive Off Switch: Temperature setpoint lever provides
complete control circuit shutdown. Does not replace power
supply disconnect switch.
Adjustable Range Stops: Limits setpoint temperature range.
Accessories:
104944A Calibration Wrench.
193121A Mounting Plate to mount thermostat on horizontal or
vertical outlet box.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
68-0095-2 2
2-7/8
4
(73)
3-1/4
(83)
4-3/4
(121)
1-1/2
(38)
T822, TS822 HEATING/COOLING THERMOSTATS
Mounting and Wiring
1. Disconnect power supply before beginning installation.
IMPORTANT
All wiring must comply with local codes and ordinances.
NOTES:
— The T822 or TS822 Thermostats are designed to
be wall or vertical outlet box mounted.
— In a 250 or 500 mV applications, use No. 14 wire,
if possible and make the run as short as possible
(consider this when selecting a location).
— For a 750 mV application, the maximum wire
lengths are shown in Table 1.
•60•70•80•90•
M2094
Fig. 1. T822/TS822 dimensions in in. (mm).
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
Electrical Hazard.
Can cause personal electrical shock or equipment
damage.
Disconnect power supply before beginning installation.
Location
Locate the thermostat about 5 ft (1.5m) above the floor 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.
Table 1. Wire Length.
Maximum Combined
Maximum Length
2-Wire Cable
L e n g t h
2-Single Wires
Wire
Size
(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 49.0
2. In replacement applications, check existing thermostat
wires for cracked or frayed insulation. Replace any
wires in poor condition.
NOTE: If wire is plastered into the wall, make a hole next to
the wires and loosen them so they can be pushed
back into the wall later.
3. In new installations, run wiring, if necessary, to the
thermostat location.
4. Connect the wires to the terminals on back of thermostat. See Fig. 2-8 for internal schematics and typical
hookup diagrams.
5. Remove thermostat cover by pulling outward from
indention on the right or left side of cover until it snaps
free of thermostat base. Carefully remove and discard
foam plastic shipping insert protecting switch and
bimetal assembly during shipping.
6. Set the adjustable heat anticipator indicator (select
models) to match the current draw of the primary heating control (see Heat Anticipator Setting).
7. Push excess wire back through the hole and plug any
opening with insulation to prevent drafts that can affect
thermostat performance.
8. Loosely fasten the thermostat to the wall or outlet box
with a screw through the top mounting hole. Do not
tighten.
9. Level the thermostat exactly using a level device.
Tighten the mounting screws.
IMPORTANT
This thermostat is calibrated at the factory, mounted
at true level. Any inaccuracy in leveling during the
mounting causes control point deviation.
10. Replace thermostat cover.
3 68-0095-2
T822, TS822 HEATING/COOLING THERMOSTATS
T822A, D
T)
D
M1290
T822A,D
T
T822A,D
A
T822C
)
D
M1295A
D
T822G
TEMP. FALL
LIMIT
CONTROL
R
3
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
ALTERNATE LIMIT CONTROL LOCATION.
2
T822D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A HAS FIXED
3
HEAT ANTICIPATOR.
W
HI
ANTICIPATOR
ELECTRIC
HEAT RELAY
2
L1
(HO
L2
M1289
1
Fig. 2. T822A,D in typical electric heat application.
TEMP. FALL
R
H1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
T822D ADJUSTABLE HEAT ANTICIPATOR SHOWN. T822A HAS FIXE
2
HEAT ANTICIPATOR.
W
H1
ANTICIPATOR
GAS
CONTRO
L
1
L1
(HOT)
L2
TEMP. RISE
R
C1
C1
ANTICIPATOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
2
CONNECT FAN TO O FOR CONTINUOUS FAN OPERATION.
CONNECT FAN TO Y FOR FAN OPERATION WITH COOLING
EQUIPMENT CYCLING.
3
POSITIVE OFF SWITCH PROVIDES COMPLETE CONTROL
CIRCUIT SHUTOFF. DOES NOT REPLACE POWER SUPPLY
DISCONNECT SWITCH.
3
O
FAN RELAY
2
Y
COMPRESSOR
RELAY
Fig. 5. T822C in typical cooling application.
1
L1
(HOT)
T834F
TEMP. FALL
H1
H1
ANTICIPATOR
FAN
SWITCH
ON
AUTO
R
G
FAN RELAY
L1
(HOT
L2
L2
1
M1292
Fig. 3. T822A,D in typical gas heating application.
TEMP. FALL
R
H1
2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
T822D FIXED HEAT ANTICIPATOR SHOWN. T822A HAS FIXED HEA
ANTICIPATOR.
W
H1
ANTICIPATOR
T
T
OIL
PRIMARY
1
L1
(HOT)
L2
M1291
Fig. 4. T822A,D in typical oil heating application.
W
HEAT RELAY
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOA
PROTECTION AS REQUIRED.
Fig. 6. T822F in typical heating application.
TEMP. FALL
1
R
C1
C1
ANTICIPATOR
Y
2
COOL RELAY
H1
L1
(HOT)
L2
W
H1
ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOA
PROTECTION AS REQUIRED.
USE EITHER "W" OR "Y" TERMINAL, BUT NOT BOTH.
2
HEAT RELAY
M1184
Fig. 7. TS822G in typical heating or cooling application.
68-0095-2 4
TS822A
E
PILOTSTAT
TH
TH/
PP
PP
CONTROL
(IF USED)
MILLIVOLTAG
GENERATOR
M1294
TEMP. FALL
R
H1
1
Y
W
1
CONNECT R AND W TERMINALS FOR 750 mV SYSTEMS. CONNECT
R AND Y TERMINALS FOR 250/500 mV SYSTEMS.
MILLIVOLTAGE
GAS CONTROL
LIMIT
CONTROL
Fig. 8. TS822A in typical heating application.
SETTINGS AND ADJUSTMENTS
Temperature Setting (All Models)
Move the temperature setting lever to the desired control point
on the temperature scale.
NOTE: On positive Off models, the control circuit is broken
when the lever is moved to the extreme low end of
the temperature scale.
T822F System Switching
The Fan switch control system operation as follows:
Auto: For gas or oil heating systems, the fan operates in
response to the thermostat call for cooling.
On: The fan operates continuously.
T822, TS822 HEATING/COOLING THERMOSTATS
Heat Anticipator Setting (T822D,F,G Only)
IMPORTANT
— The T822D,F,G has an adjustable heat anticipator
and operates correctly 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 anticipator. Do not use this device on Powerpile (millivolt)
systems.
1. 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.
2. If the current rating is not available, proceed as follows
to determine the rating:
a. Turn off the power.
b. Wire thermostat, except connection to W terminal,
but do not mount it on the wall.
c. Connect ammeter between W wire and W terminal
on thermostat in series with primary control.
d. Prepare system for operation.
e. Turn on power.
f. Turn System switch to Heat.
g. Increase thermostat setpoint, as necessary, to start
system operating.
h. With system operating through ammeter, wait one
minute, then read ammeter.
i. Turn System switch to Off and turn off power.
j. Adjust heat anticipator to match reading on amme-
ter.
k. Disconnect ammeter, reconnect W wire, and mount
thermostat. Continue with system checkout.
NOTE: The heat anticipator may require further adjustment
for best performance. To lengthen burner-on time,
move indicator in direction of longer arrows but not
more than a half-scale marking at a time. To shorten
burner-on time, move indicator in opposite direction.
5 68-0095-2
T822, TS822 HEATING/COOLING THERMOSTATS
CHECKOUT
CAUTION
Checkout Method Hazard.
Can damage thermostat heat anticipator.
Avoid checking thermostat operation by shorting
across system control terminals.
T822A,D,F and TS822A Heating and T822G Heating or Cooling Thermostats
6. For T822G cooling applications only:
• To prevent compressor short cycling, install a fiveminute 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.)
• 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 (6°C) above room temperature. Cooling
and fan should stop immediately.
IMPORTANT
— T822A,D,F and TS822A can only be installed in
heating applications. Perform only steps 1-5.
— T822G can be installed in either heating or cooling
applications. If installed for heating, perform steps 1-
5. If installed for cooling, perform step 6.
1. Set T822F Fan switch at Auto. Fan operation is controlled by the thermostat.
2. Move temperature setting lever about 10°F (6°C) above
room temperature.
• Gas or oil heating systems: Heating starts
immediately. Fan starts after short delay.
• Electric heating systems: Heating and fan start
immediately.
3. Move temperature setting lever about 10°F (6°C) below
room temperature.
• Gas or oil heating systems: Heating stops
immediately. Fan stops after a short delay.
• Electric heating systems: Heating and fan stop
immediately.
4. Set T822F Fan switch to On. Fan runs continuously.
5. Set temperature lever and T822F Fan switch to desired
settings.
CAUTION
Equipment Damage Hazard.
Can short-cycle air conditioner compressor.
Install five-minute time delay to prevent operating
compressor for five minutes after thermostat turns off
compressor or for five minutes after system receives
power.
Avoid operating T822G Thermostat in cooling
applications when outdoor temperature is below 50°F
(6°C).
See air conditioner manufacturer recommendations.
T822C Cooling Thermostats
CAUTION
Equipment Damage Hazard.
Can short-cycle air conditioner compressor.
Install five-minute time delay to prevent operating
compressor for five minutes after thermostat turns off
compressor or for five minutes after system receives
power.
Avoid operating T822C Thermostat in cooling
applications when outdoor temperature is below 50°F
(6°C).
See air conditioner manufacturer recommendations.
1. To prevent compressor short cycling, install a fiveminute 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.)
2. Move temperature setting lever about 10°F (6°C) below
room temperature. Cooling and fan start immediately.
3. Move temperature setting lever about 10°F (6°C) above
room temperature. Cooling and fan stop immediately.
CAUTION
Checkout Method Hazard.
Can damage thermostat heat anticipator.
Avoid checking thermostat operation by shorting
across system control terminals.
68-0095-2 6
T822, TS822 HEATING/COOLING THERMOSTATS
T
Recalibration
These thermostats are calibrated at the factory and should not
require recalibration. If the thermostat seems out of
adjustment, first check for accurate levelling. To check
calibration:
1. Move the temperature setting lever to the low end of the
temperature scale.
2. Remove the thermostat cover. Move the temperature
setting lever until the switch just makes contact. (The
mercury in the switch will drop to the contact end of the
tube.)
3. Replace the thermostat 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 temperature lever indicator read approximately the
same, no recalibration is needed.)
4. If recalibration appears necessary, use this procedure:
a. Place the temperature setting lever at the same set-
ting as the thermometer.
b. Remove the thermostat cover.
c. Insert 104994A Calibration Wrench (ordered sepa-
rately) onto the hex nut under the coil. See Fig. 10.
Holding the setting lever so it does not move, turn
the wrench clockwise until the switch just breaks
contact.
d. Remove the wrench and replace the thermostat
cover.
e. Move the temperature setting lever to a low setting.
Wait at least five minutes for the temperature to stabilize.
f. Slowly move the temperature setting lever until it
reads the same as the thermometer.
g. Remove the cover. Holding the temperature setting
lever so it does not move, reinsert the wrench and
carefully turn the wrench counterclockwise until the
mercury just rolls to the left end of the tube, but no
farther.
h. Recheck the calibration by setting the thermostat
System switch for the desired operation.
i. Replace the cover.
COIL SHOWN WITHOU
HEAT ANTICIPATOR
CALIBRATION
WRENCH
M2044A
Fig. 9. Recalibrating thermostat.
7 68-0095-2
T822, TS822 HEATING/COOLING THERMOSTATS
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
68-0095-2 G.H. Rev. 1-03 www.honeywell.com/yourhome
M1V 4Z9
Printed in U.S.A. on recycled
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