NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA
Y TERMINAL LETTERS ARE BRAND SPECIFIC
X
B*
C
RH
V
R
W1
4
W
A
W1
A
W2
O
B
C
G
Y
RC
RH
HOT W
A
TER HEA
TING ONL
Y
(WITH A 3-WIRE ZONE V
A
L
VE)
Factor
y RH-RC Jumper Wire Installed
#2
3, 4 WIRES
SY
STEM 24V
TR
ANSFORMER
SYSTEM COMMON
OPEN = Heat On
CLOSE = Heat Off
3-WIRE Z
ONE
V
A
L
V
E
OPEN
CL
OSE
O
P
T
I
O
N
A
L
10
