
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRA
Y
TERMINAL LETTERS ARE BRAND SPECIFIC
X
W1
4
W
B*
A
RH
V
R
W1
A
Y2
O
BW
2
C
G
Y1
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
C
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
3, 4 WIRES
O
P
T
I
O
N
A
L
10