4
4
TYPICAL WIRING DIAGRAMS
CAUTION:
Be sure to disconnect the power to the control transformer before removing or installing thermostat.
Do not short gas valve, fan, heat relay, or cool relay...even momentarily. This will blow a non-replaceable fuse.
Do not attempt to hook up to live circuits. An accidental connection to a component on the thermostat circuit
board could cause damage to the thermostat.
Figure 4 - Thermostat power-up for test or demonstration purposes
Note: As a convenience to the installer, the compressor start up protection delay can be canceled. To cancel
the delay, press the Prog key 3 times, then press the Fan key 2 times.
Common wire is required in “heat only” applications
Figure 5
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Single stage heat only thermostat