B93Q book English p. 16-32
2/7/03
10:05 AM
Page 15
Wiring Diagrams
4-wire Heat/Cool System
5-wire Heat/Cool System
Cool
Transformer
32-33
THERMOSTAT
Jumper
RC
RH
G
W
Y
Heat/Cool
Fan
Heat Relay
Cool
Transformer
Relay
or Valve
Contactor
THERMOSTAT
RC
RH
G
W
Y
Heat
Fan
Heat Relay
Cool
Transformer
Relay
or Valve
Contactor