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OPERATIONAL AND CONNECTION INFORMATION
Rc/Rh Connections
For installations having a separate 24VAC transformer for heating and cooling, the
R connection can be separated into two connections, one for each transformer. This
allows isolation between the two transformers to be preserved. T o separate Rc from
Rh, remove the factory supplied jumper between the Rc and Rh terminals. The Rh
terminal powers the W output. The Rc terminal powers the Y1, Y/Y2, G and O
outputs.
Wiring
For all wiring applications, use 22 AWG or larger wire. Continuous wire lengths
over 100 ft. (30.5 m) should u se 20 AWG or larger. Wire lengths are not to exceed
250ft.(76m)perrun.
O/B Terminal -- On HP Thermostat Only
This terminal is normally connected to the reversing valve of the heat pump. It is
called O when the valve is energized in cooling and B when it is energized in
heating. Option 10 of the Configuration Options makes the O/B selection.
Timers
There are several timers which influence the thermostat’s operation:
If any of the timers listed below is preventing the equipment from turning on, the
display icons which show the equipment is operating will be flashing to indicate a
turn-- on delay is present.
Five--Minute Compressor Timeguard
This timer prevents the compressor from starting unless it has been off for 5
minutes. It can be defeated for one cycle by simultaneously pressing the FAN and
UP keys.
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