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1. Pull wires through wire hole.
Position base on wall, level and
mark hole positions.
2. Drill holes (3/16” holes for
drywall, 7/32” holes for plas-
ter), then tap in supplied wall
anchors.
3. Pull wires through base, posi-
tion over anchors, and insert
screws. Check level if desired,
then tighten screws.
Base installation
1. Loosen screw terminals, insert bare wires
beneath screws, then re-tighten screws.
2. Push any excess wire back into the wall
opening
3. Plug the wall opening with nonflammable
insulation to prevent drafts from affecting
thermostat operation.
Terminal Designations
R Heating power. Connect to secondary
side of heating system transformer.
W Heat relay.
Y Compressor or normally closed hot water
valve. **
** T822L only
Wire specifications
Use 18-gauge thermostat wire. Shielded
cable is not required.
Wiring
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