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Owner's Manual
STEP 1. PREPARE FOR
INSTALLATION
The T822 Thermostat controls 2-wire, 15 Vac to 30 Vac,
gas, oil or electric heating-only systems.
The T822 Thermostat is not suitable for:
• cooling systems
• heating-cooling systems
• 3-wire electric heating systems
If you are unsure which thermostat model is right for your
system, visit www.honeywell.com/yourhome or call
Honeywell Customer Care at 1-800-468-1502.
1. Check that the following components are included:
• Thermostat
• Two one-inch screws
• Installation Instructions
2. Required tools:
• Slotted screwdriver
• Drill
• Drill bit (1/16 in.)
• Needle nose pliers
• Level
• Pencil
STEP 2. REMOVE OLD
THERMOSTAT
1. Turn power off to the system at the furnace or at
the fuse/circuit breaker panel.
2. Remove cover on the old thermostat. If the cover
does not easily pull off, remove any screws that
may fasten the cover to the thermostat.
® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. •
T822 Thermostat
3. Locate the heat anticipator scale and the heat
anticipator lever on the old thermostat (see Fig. 1).
TYPICAL LOCATION OF HEAT
ANTICIPATOR SCALE AND LEVER
Fig. 1. Heat anticipator on old thermostat (example).
4. Record the number that the heat
anticipator lever points to on the heat
anticipator scale.
NOTE: If you cannot find the heat anticipator setting on
your thermostat, you can use a standard setting
for your type of system when you reach Step 5.
Set Heat Anticipator On New Thermostat.
5. Remove any screws that hold the thermostat to the
wall and pull the thermostat away from the wall.
6. Remove the two wires from the old thermostat and
wrap them around a pencil to keep them from fall-
ing back into the wall (see Fig. 2). If there are more
than two wires connected to your old thermostat,
do not remove the wires. Visit www.honey-
well.com/yourhome or call 1-800-468-1502 for fur-
ther assistance with the installation.
Fig. 2. Pull wires through wall opening.
• All Rights Reserved
INSTALLATION INSTRUCTIONS
OLD THERMOSTAT HEAT
ANTICIPATOR SCALE
HEAT ANTICIPATOR LEVER
WIRES
THROUGH
WALL
OPENING
M19645
M21192
69-1711
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Summary of Contents for Honeywell T822
- Page 1 TYPICAL LOCATION OF HEAT ANTICIPATOR SCALE AND LEVER M21192 The T822 Thermostat controls 2-wire, 15 Vac to 30 Vac, Fig. 1. Heat anticipator on old thermostat (example). gas, oil or electric heating-only systems. 4. Record the number that the heat...
- Page 2 T822 THERMOSTAT MERCURY NOTICE If this thermostat is replacing a control that contains mercury in a sealed tube, do not place the old thermostat in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal of this control or of an old control containing mercury in a sealed tube.
- Page 3 4 (see Fig. 7). STOPS HEAT ANTICIPATOR 1. The T822 Thermostat comes equipped with adjust- able range stops (see Fig. 8). The range stops are factory set to allow for maximum adjustment of the temperature lever. If you choose to limit the adjust-...
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Page 4: If You Have A Problem
T822 THERMOSTAT IF YOU HAVE A PROBLEM Customer Assistance Please read and follow the provided instructions for this thermostat. For additional information, go to If. . . Then. . . www.honeywell.com/your home or call Honeywell Heating system • Make sure the temperature Customer Care at 1-800-468-1502.