UPM THM301A Installationsanleitung PDF herunterladen (Seite 11)

REPLACING OLD THERMOSTAT

Note: Do not operate the cooling system when outside temperature is below 10°C (50°F) to avoid

damaging the compressor.

l Test the system to make sure that your heating and cooling are working properly before installation. If either

does not work, contact your local heating/air-conditioning dealer to fix the problem before installation.

l TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel.

l Carefully unpack your new thermostat and mounting plate; save package of screws,

instructions and receipt.

l 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.

l Loosen screws holding thermostat to the wall and lift away the thermostat.

l Disconnect wires from old thermostat or sub-base. As you disconnect each wire, use masking tape to label

it with the old terminal designation. If there are only two wires, they don't need to be labeled.

l 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.

l Take care not to let the wires fall back into the wall or let the ends of the wires touch one another.

l The wires are usually designated 'W', 'Y', 'G', 'RH', 'RC', 'O', 'B', 'H1', 'H2'.

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UPM THM301A Installationsanleitung Seite 11