2-WIRE HEAT-ONLY (JUMPER INTACT)
A
B
HEATING
RELAY OR
VALVE COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
C
D
W
Y
G
Rc
R
JUMPER
L1
(HOT)
1
L2
M1709A
4-WIRE HEAT/COOL (JUMPER INTACT)
HEATING
COOLING
RELAY OR
CONTACTOR
VALVE COIL
COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
22
A
C
B
D
W
Y
G
Rc
R
JUMPER
FAN
L1
RELAY
(HOT)
L2
M1710A