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Pairing the iT500 Thermostat with the iT500RX Receiver
Using a paper clip, insert into the hole marked SYNC at the
bottom of the iT500RX Receiver.
The bottom switch will show a constant red light when the
iT500RX. Receiver is ready to pair.
When the iT500RX Receiver and the iT500 Thermostat are
powered and paired then the light will be green.