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NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
XW1
4
W
B*
A
RH
V
R
W1 A Y2 O B W2 CG Y1 RC RH
HOT WATER HEATING ONLY
(WITH A 3-WIRE ZONE VALVE)
Factory RH-RC Jumper Wire Installed
#2
C
SYSTEM 24V
TRANSFORMER
SYSTEM COMMON
OPEN = Heat On
CLOSE = Heat Off
3-WIRE ZONE VALVE
OPEN CLOSE
3, 4 WIRES
O
P
T
I
O
N
A
L
10