3M 3M-30 - Wire Reference Chart

PG 16
PG 16
PG 17
Wire Reference Chart
Possible Wires What they control
R or V or VR RH and RC Single power for HEAT and COOL
RH or 4 RH Power for HEAT (RH not connected to RC jumper clip removed)
RC RC Power for COOL (RH not connected to RC jumper clip removed)
W W Heat control
W2 W2 2nd stage HEAT or heat pump auxiliary heat
W3 W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat
Y Y COOL control or 1st stage compression for heat pump.
Y2 Y2 2nd stage COOL control or 2nd stage compression for a heat pump
G or F G FAN control
C or X C 24VAC power (to power thermostat )
NOTE: TRANE uses B for this connection
H H External Humidier
DH DH External De-Humidier
EX EX external fresh air bafe
B B Heat pump changeover (cool to heat, powered in heat)
O O Heat pump changeover (heat to cool, powered in cool)
B and O
IMPORTANT: If there are both B and O wires (Trane pump
products) DO NOT CONNECT B to B terminal, connect B to C
terminal. If not a Trane product tape off B.
E n/a Emergency heat (do not connect, tape off)
L n/a System monitor (do not connect, tape off)
T n/a Outdoor sensor (do not connect, tape off)