22
OPERATIONAL AND CONNECTION INFORMATION

Rc/Rh Connections

For installationshaving a separate 24VAC transformerfor heating and cooling, the
R connectioncan be separated into two connections, one for each transformer.This
allows isolation between the two transfo rmers to be preserved. To separate Rc from
Rh, remove thefactory 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 largerwire. Continuous wire lengths
over 100 ft.(30.5 m) should use 20 AWG or larger.Wire lengths arenot to exceed
250ft.(76m)perrun.

O/B Terminal --On HP T hermostat Only

This terminal is normally connected to th e reversing valve of the heat pum p. It is
called O when the valve is energized in cooling and B when it is energizedin
heating.Option 10 of the Configuration Options makesthe O/B selection.

Timers

Thereare several timers which influence the thermostat’soperation:
If any of the timerslisted below is preventing the equipment from turningon, the
display iconswhich show the equipment is operating will be flashing to indicatea
turn--ondelay is present.
Five--MinuteCo mpressor Timeguard
This timer prevents the compre ssor from starting unless it has been off for 5
minutes.It can be defeatedfor one cycle by simultaneously pressing the FANand
UPkeys.