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2-WIRE HEAT-ONLY (JUMPER INTACT)
A
C
B
D
HEATING
RELAY OR
VALVE COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 4. Typical hookup in two wire lead
only (jumper intact) application.
4-WIRE HEAT/COOL (JUMPER INTACT)
A
C
B
D
HEATING
COOLING
RELAY OR
CONTACTOR
VALVE COIL
COIL
FAN
RELAY
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 5. Typical hookup in four wire heat
and cool (jumper intact) application.
T8112C,D ELECTRONIC PROGRAMMABLE THERMOSTATS
JUMPER
W
Y
G
Rc
R
L1
(HOT)
1
L2
M1709B
W
Y
G
JUMPER
Rc
R
L1
(HOT)
L2
M1710B
5-WIRE HEAT/COOL (JUMPER REMOVED)
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
1
COIL
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 6. Typical hookup in five wire heat
and cool (jumper removed) application.
3-WIRE COOL-ONLY (JUMPER INTACT)
COOLING
CONTACTOR
COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 7. Typical hookup in three wire cool
only (jumper intact) application.
3
A
C
B
D
W
Y
G
Rc
R
FAN
RELAY
A
C
B
D
W
Y
G
Rc
R
FAN
RELAY
L1
(HOT)
L2
1
L1
(HOT)
L2
M1711B
JUMPER
M848A
69-0917—2
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