Step 2 Remove Old Thermostat - Honeywell MagicStat 28 Programming And Installation Instructions

STEP 2
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 system at the
furnace, or at the fuse/circuit breaker panel.
Carefully unpack your new thermostat and
mounting plate; save the package of screws,
instructions and receipt.
Remove cover from 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
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 need to be labeled. If there is an extra
wire that is not connected to your old thermo-
stat, you will also 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.
4
WIRES THROUGH
WALL OPENING
M5136