Installation Manual

THERMOSTAT TERMINAL DEFINITIONS
R – 24VAC power to thermostat
C – 24VAC power to thermostat
W – First stage heat (conventional) / First stage auxiliary (heat pump)
W2 – Second stage heat (conventional) / Second stage auxiliary (heat pump)
Y – First stage cooling (conventional) / First stage compressor(heat pump)
Y2 – Second stage cooling (conventional) / Second stage compressor (heat pump)
G – Fan
O – Reversing valve (heat pump)
L – System fault indicator (heat pump) (optional)
NOTE:
The L output to the thermostat is derived from the L system fault indicator input to the zone panel from the HVAC equipment. The L output to the
thermostat is only available in Zone 1. If using the system fault indicator choose Zone 1 to be a thermostat that is in a frequently occupied space.
HVAC TERMINAL DEFINITIONS
RH – 24VAC from heating or auxiliary heat equipment
RC – 24VAC from cooling equipment or compressor
W – First stage heat (conventional) / First stage auxiliary (heat pump)
W2 – Second stage heat (conventional) / Second stage auxiliary (heat pump)
Y – First stage cooling (conventional) / First stage compressor (heat pump)
Y2 – Second stage cooling (conventional) / Second stage compressor (heat pump)
G – Fan
B – Reversing valve – heating (heat pump)
O – Reversing valve – cooling (heat pump)
L – System fault indicator (heat pump)
C – 24VAC common from RC transformer (only required if L input is used)
NOTE:
For two transformer systems, remove the jumper next to the RH and RC terminals labeled JMP.
English 11