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3-wire Cool Only
Rh
Rc
Y/O
W/B
Y1
G
Jumper
X
X
Wallplate
Terminals
Cool
Contactor
Cool 24V
Supply
Fan
Relay
X
System
Selector
STD
HP
–
X - No Connection
3-wire Heat Only
Jumper
X
X
Wallplate
Terminals
Fan
Relay
Rh
Rc
Y/O
W/B
Y1
G
Heat 24V
Supply
X
HeatRelay
orValve
System
Selector
STD
HP
–
wiring diagrams, cont.