Honeywell T822C Thermostat User Manual

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T822C,E  
Cooling Thermostats  
Application  
Fig. 1—T822C in typical cooling application  
with fan relay.  
T822C  
T822C,E Thermostats provide low voltage control of  
cooling systems. Both models have fixed cooling antici-  
pators and are available with a positive OFF switch and  
temperature range stops. The T822E has ON-AUTO fan  
switching and OFF-AUTO system switching.  
TEMP. RISE  
L1  
(HOT)  
R
L2  
3
C1  
1
O
FAN RELAY  
C1  
ANTICIPATOR  
2
Recycling Notice  
M3375  
Y
COMPRESSOR  
RELAY  
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 mer-  
cury in a sealed tube, do not place your old control in the  
trash.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
2
CONNECT FAN TO O FOR CONTINUOUS FAN OPERATION.  
CONNECT FAN TO Y FOR FAN OPERATION WITH COOLING  
EQUIPMENT CYCLING.  
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.  
3
POSITIVE OFF SWITCH PROVIDES COMPLETE CONTROL  
CIRCUIT SHUTOFF. DOES NOT REPLACE POWER SUPPLY  
DISCONNECT SWITCH.  
M1292A  
MOUNTING AND WIRING  
If you have questions, call Honeywell at 1-800-468-  
502.  
Disconnect power supply before beginning installa-  
tion to prevent electrical shock or equipment damage.  
All wiring must comply with local codes and ordi-  
nances. T822C,E Thermostats are designed to be verti-  
cally mounted on a wall or an outlet box.  
1
Installation  
1
. In replacement applications, check the existing  
WHEN INSTALLING THIS PRODUCT...  
. Read these instructions carefully. Failure to fol-  
low them could damage the product or cause a hazard-  
ous condition.  
thermostat wires for cracked or frayed insulation. Re-  
place 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 that they can be pushed back into the wall  
later.  
1
2
. Check the ratings given in the Instructions and  
on the product to make sure the product is suitable for  
your application.  
2
. In new installations, run wiring (if necessary) to  
the thermostat location.  
. Connect the wires to the terminals on the back of  
3
. Installer must be a trained, experienced service  
3
technician.  
the thermostat. See Figs. 1, 2, or 3 for internal schemat-  
ics and typical hookup diagrams.  
4
4
. After installation is complete, check out product  
operation as provided in these Instructions.  
. 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 bi-  
metal assembly during shipping.  
5. Push excess wire back through the hole and plug  
any opening with insulation to prevent drafts that may  
affect thermostat performance.  
CAUTION  
Disconnect power supply before beginning in-  
stallation to prevent electrical shock or equip-  
ment damage.  
LOCATION  
Locate the thermostat about 5 ft [1.5 m] above the  
floor on an inside wall in an area with good air circula-  
tion at average temperature.  
6. Loosely fasten the thermostat to the wall or outlet  
box with a screw through the top mounting hole. Do not  
tighten.  
Do not mount the thermostat where it can be affected  
by:  
7. Level the thermostat exactly using a spirit level or  
plumb line. Tighten the mounting screws.  
drafts or dead spots behind doors or in corners.  
hot or cold air from ducts.  
radiant heat form the sun, fireplaces, or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas behind the thermostat  
such as an outside wall.  
IMPORTANT: An incorrectly leveled thermostat will  
cause the temperature control to deviate from  
setpoint.  
8. Replace the thermostat cover.  
J. H. • Rev. 2-93 • 
• ©Honeywell Inc. 1993 • Form Number 69-05482  
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Fig. 3—T822E in typical cooling application.  
Fig. 2—T822C in typical cooling application.  
L1  
(HOT)  
T822C  
1
L2  
TEMP. RISE  
T822E  
L1  
TEMP. RISE  
R
(HOT)  
FAN  
SWITCH  
L2  
R
G
C1  
1
ON  
C1  
AUTO  
FAN RELAY  
C1  
ANTICIPATOR  
SYSTEM  
SWITCH  
Y
C1  
ANTICIPATOR  
Y
COMPRESSOR  
CONTACTOR  
AUTO  
OFF  
COMPRESSOR  
RELAY  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
M2305  
PROTECTION AS REQUIRED.  
M1293  
the switch will drop to the contact end of the tube.  
. Replace cover and wait five minutes for the cover  
and the thermostat to lose the heat it has gained from  
your hands. If the thermostat pointer and the setting  
lever indicator read approximately the same, no  
recalibration is needed.  
Settings and Adjustment  
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 high end of the temperature scale.  
3
If recalibration appears necessary, proceed as fol-  
lows:  
1
. Place the temperature setting lever at the same  
setting as the thermometer. Remove cover.  
. Insert 104994A Calibration Wrench (order sepa-  
T822E FAN AND SYSTEM SWITCHING  
The fan switch controls fan operation as follows:  
AUTO— fan operates in response to the thermostat  
call for cooling.  
2
rately) onto the hex nut under the coil. See Fig. 4.  
Holding the setting lever so it does not move, turn the  
wrench clockwise  
tact. Remove 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.  
ON— fan operated continuously.  
until the switch just breaks con-  
The system switch controls system operations as  
follows:  
OFF—cooling control system is disabled.  
AUTO—cooling control system operates in response  
to the thermostat call for cooling.  
5
. Remove cover. Holding the setting lever so it does  
not move, reinsert wrench and carefully turn counter-  
clockwise 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.  
RECALIBRATION  
These thermostats are calibrated at the factory and  
should not need recalibration. If the thermostat seems  
out of adjustment, first check for accurate leveling. To  
check calibration, proceed as follows:  
1
. Move the temperature setting lever to the low end  
of the temperature scale.  
. Remove the thermostat cover. Move the setting  
lever until the switch just makes contact. The mercury in  
2
2
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2
. Move temperature setting lever about 10° F [6° C]  
Checkout  
below room temperature. Cooling and fan start immedi-  
ately.  
3
. Move temperature setting lever about 10° F [6° C]  
CAUTION  
above room temperature. Cooling and fan stop immedi-  
ately.  
Do not check thermostat operation by shorting  
across system control terminals. This damages  
the thermostat heat anticipator.  
4
. Set T822E SYSTEM switch to AUTO and FAN  
switch to ON. Fan runs continuously.  
. Set T822E SYSTEM switch to OFF. Cooling  
control system is disabled.  
. Set temperature lever and T822E SYSTEM and  
5
6
FAN switches to the desired settings.  
T822C,E COOLING THERMOSTATS  
Fig. 4—Recalibration procedure.  
CAUTION  
Do not operate cooling circuit if outdoor tempera-  
ture is 50° F [10° C] below room temperature.  
Refer to air conditioner manufacturer recommen-  
dations.  
COIL SHOWN WITHOUT  
HEAT ANTICIPATOR  
NOTE: To prevent compressor short cycling, a mini-  
mum off-timer may be included to provide a five  
minute time delay before reactivating the compressor  
or after compressor receives power.  
1
. Set T822E SYSTEM switch to AUTO and FAN  
switch to AUTO. Fan and system operation are now  
controlled by the thermostat.  
CALIBRATION  
WRENCH  
M2044  
3
69-0548—2  
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Home and Building Control  
Honeywell Internationl, Inc.  
Home and Building Control  
Honeywell Limited—Honeywell Limitée  
35 Dynamic Drive  
1
985 Douglas Drive North  
Printed in U.S.A. on recycled  
paper containing at least 10%  
post-consumer paper fibers.  
Golden Valley, MN 55422  
Scarborough, Ontario  
M1V 4Z9  

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