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B*
Y1 6Y
HEAT
PUMP
4 / 5 WIRES
HEAT PUMP SYSTEMS
1-HEAT / 1-COOL,
WITH NO AUXILIARY / EMERG. HEAT
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL,
GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
X
F
G
B*
Factory
RH-RC
Jumper
Wire
Installed
For Heat-Pumps
ONLY, Add
Second
Jumper Wire
(Supplied)
#5
C
FAN
OPTIONAL
SYSTEM COMMON
O
REVERSING
VALVE
RC
V
R
24V
TRANSFORMER
* Heat-Pump: if “O” and “B” are both present,
install old “B” wire onto “C” terminal.
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