Honeywell D, T8112C Fig. 6. Typical hookup in five wire heat and cool (jumper removed) application., Fig. 4. Typical hookup in two wire lead only (jumper intact) application.

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