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5
R
W
G
T
H
E
R
M
O
S
T
A
T
120 VAC
24 VAC
Transformer
Hot
HEATING
CONTROL
R
W
G
T
H
E
R
M
O
S
T
A
T
FAN
CONTROL
HEATING
CONTROL
120 VAC
24 VAC
Transformer
Hot
R
W
G
T
H
E
R
M
O
S
T
A
T
TT PP
PP
T N
Gas valve
Pilot
Generator
◆ Wiring Diagrams
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
HEAT ONLY
3-WIRE
SINGLE TRANSFORMER
250-750
MILLIVOLT
SYSTEM