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Test the system to make sure that your heating and cooling systems are working properly before
installation. If either does not work, contact a heating/air conditioning service person to fix the
problem before installation.
TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel.
Carefully unpack your new thermostat and mounting plate; save 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 secure the cover. Loosen screws holding thermostat to the wall and lift
away the thermostat.
26
Replacing the Old Thermostat
Wiring
NOTE: WIRING COLORS ARE NOT ALWAYS STANDARDIZED, SO IT IS VERY IMPORTANT TO
LABEL ALL WIRES ACCORDING THE LETTER DESIGNATION ON YOUR OLD THERMOSTAT.
(The wires are usually designated 'W', 'Y', 'G', 'RH', 'RC', 'W' ,'B', ‘O' or humidistat wires.)
Disconnect wires from old thermostat or sub-base. As you disconnect each wire, use masking tape
to label it with the old terminal designation.
Take care not to let the wires fall back into the wall or let the ends of the wires touch one another.
If there is an extra wire that is not connected to your old thermostat, then you won't need to connect
it to the new thermostat.
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