Carrier TP-WEM01 - Equipment Configuration

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Step 2. Remove Existing Thermostat
Remove the cover from your old thermostat. Most snap off easily but
some may be attached by screws.
Note: If the old thermostat has 110/120V wires connected to the
thermostat, it is a high voltage system and is not compatible with this
thermostat.
Look at the wires coming out of the wall. Using the old thermostat
base as a guide, use provided labels to label each wire coming out of
thewall(SeeFig.6).
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Fig. 6 -- Label Thermostat Wire