Honeywell T812A1002 - Mechanical Thermostat User Manual page 5

Fig. 8—2-wire heat-only application (jumper
intact).
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. 9—3-wire cool-only application (jumper
intact).
3-WIRE COOL-ONLY (JUMPER INTACT)
A C
B D
COOLING
CONTACTOR
COIL
FAN
RELAY
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
JUMPER
W Y G
Rc
R
L1
(HOT)
1
L2
M1709B
W Y G
JUMPER
Rc
R
L1
(HOT)
L2
M848A
Fig. 10—4-wire heat/cool 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. 11—5-wire heat/cool application (jumper
removed).
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.
5
T8131A,B,C; T8132A,B,C
I N S T A L L A T I O N
C
D
W Y G
JUMPER
Rc
R
FAN
L1
RELAY
(HOT)
L2
M1710B
A C
B D
W Y G
Rc
R
FAN
RELAY
1
L1
(HOT)
L2
M1711B
68-0148—1