Wiring Diagrams - Honeywell T8112D Product Data

T8112D PROGRAMMABLE THERMOSTAT
INSERT
STRAIGHT
5/16 in.
UNDER
(8 mm)
SCREW HEAD
STRIP
END OF WIRE
VISIBLE HERE
Fig. 3. Proper wiring technique.
Fig. 4. Holding thermostat while installing.
2-WIRE HEAT-ONLY (JUMPER INTACT)
A
B
HEATING
RELAY OR
VALVE COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 5. 2-wire heat-only application (jumper intact).
68-0206
JUMPER (FACTORY-
INSTALLED) REMOVE
IF 5-WIRE SYSTEM
c
R
R
G Y W
M1712A
M3002A
C
D
JUMPER
W Y G
Rc
R
L1
(HOT)
1
L2
M1709B
3-WIRE COOL-ONLY (JUMPER INTACT)
A
B
COOLING
CONTACTOR
COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 6. 3-wire cool-only application (jumper intact).
4-WIRE HEAT/COOL (JUMPER INTACT)
A
B
HEATING COOLING
RELAY OR CONTACTOR
VALVE COIL COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 7. 4-wire heat/cool application (jumper intact).
4
C
D
W Y G
JUMPER
Rc
R
FAN
L1
RELAY
(HOT)
L2
M848A
C
D
W Y G
JUMPER
Rc
R
FAN
L1
RELAY
(HOT)
L2
M1710B