Remove Old Thermostat - Honeywell T8131A Owner's Manual

Remove Old Thermostat

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 damage, do not
operate the cooling system when outdoor
temperature is below 50 F (10 C).
Turn off power to the system at the
furnace, or at the fuse/circuit breaker
panel.
Carefully unpack your new thermostat
and mounting plate; save the package of
screws, the instructions and the receipt.
Remove the cover from the old thermo-
stat. 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
subbase, wallplate or wall, and lift away.
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 require labeling. If
there is an extra wire that is not con-
nected to your old thermostat, you also
will not be connecting it to your new
thermostat. Keep the wires from falling
back into the wall by wrapping them
around a pencil as shown.
7
WIRES THROUGH
WALL OPENING
M5136
69-0887—1