Simple S100 - Wiring Guide

3
Connect your system’s wiring using the table below.
Terminal Function
RC 24VAC for cooling.
RH 24VAC for heating. If there is only one R wire (R, RH, RC) then
connect it to RH. May be labeled V or VR for Lennox.
C Common wire. May be labeled X for Rheem, Ruud, or Lennox;
B for Trane, York.
Y 1st stage compressor, A/C or heat pump. May be labeled M
for Lennox.
Y2 2nd stage compressor, A/C or heat pump.
W/E 1st stage heating, or heat pump emergency heat. Some
heat pumps may designate emergency heat as E or X2, or
auxiliary heat as W1 or W2. May be labeled Y for Lennox.
W2 2nd stage heating. Not used for heat pumps.
O/B Heat pump changeover valve.
Wiring Guide