Lux Products TX500U Installation And Operating Instructions Manual page 9

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