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3 69-0733B—1
Acquire tools and items as needed (below).
CROSS-RECESSED
SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED, TO
DRILL HOLES IN WALL
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED, TO STRIP WIRES
MASKING TAPE, IF
NEEDED, TO LABEL WIRES
AS DISCONNECTED FROM
OLD THERMOSTAT
LEVEL, IF NEEDED, TO LEVEL
THERMOSTAT FOR APPEARANCE
M878B
4 69-0733B—1
STEP 2 Remove Old Thermostat
Disconnect wires from old thermostat or
subbase. As you disconnect each wire, use
masking tape to label it with the old terminal
designation. If there are only two wires, they do
not need to be labeled. Wrap wires around
pencil to keep them
from falling back into
the wall, as shown.
One or two extra
wires?
If you are replacing a
Honeywell Chronotherm
®
Thermostat, you may
find one or two wires that go to the clock termi-
nals on the Chronotherm thermostat wiring
wallplate. Do not allow them to touch, or you can
damage your transformer. Disconnect the wires
Test to make certain that your heating and
cooling systems are working properly. If either
does not work, contact your local heating/air
conditioning dealer. To avoid compressor dam-
age, do not operate the cooling system when
outdoor temperature is below 50° F [10° C].
Turn off power
to system at the furnace, or
at the fuse/circuit breaker panel.
Carefully unpack your new thermostat and
wallplate; save package of screws, instructions
and receipt.
Remove the cover from the old thermostat. If
it does not snap off when pulled firmly from the
bottom, check for a screw used to lock on the
cover.
Loosen screws holding thermostat to sub-
base, wallplate or wall, and lift away.
WIRES THROUGH
WALL OPENING
M5136
7


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