Honeywell T812A1002 - Mechanical Thermostat User Manual page 4

T8131A,B,C; T8132A,B,C
I N S T A L L A T I O N
Fig. 3—Mounting thermostat mounting plate.
WIRES THROUGH
WALL OPENING
WALL
WIRING
All wiring must comply with all applicable electrical
codes, ordinances, and regulations. Follow instructions
provided with the controlled equipment.
Loosen the terminal screws and slip each wire beneath
its matching terminal. See Fig. 4 for wiring insertion tech-
niques. Tighten terminals securely.
Plug the hole in the wall with insulation to help prevent
drafts from adversely affecting thermostat operation.
T8131 Models
Run the required number of wires to the thermostat
location (check the appropriate wiring diagram). Refer to
Figs. 5 through 7 for typical wiring diagrams.
T8132 Models
Run the required number of wires to the thermostat
location (check the appropriate wiring diagram). Refer to
Figs. 8 through 11 for typical wiring diagrams.
In 5-wire installations only, be sure to remove the fac-
tory-installed jumper connecting terminals R and Rc.
Fig. 4—Proper wiring technique.
PROPER WIRING TECHNIQUE
5/16 in.
[8 mm]
STRIP
68-0148—1
WALL
ANCHORS (2)
MOUNTING
PLATE
MOUNTING
SCREWS (2) M1718
INSERT
STRAIGHT
UNDER
SCREW HEAD
END OF WIRE
VISIBLE HERE
M3825
Fig. 5—3-wire heat-only application.
3-WIRE HEAT-ONLY
HEATING
RELAY OR
VALVE COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 6—4-wire cool-only application.
4-WIRE COOL-ONLY
A
B
COOLING
CONTACTOR
COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 7—5-wire heat/cool application.
5-WIRE HEAT/COOL
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
4
A
B
W Y G
R
C
1
L1
(HOT)
L2
M9213
W Y G
R
C
1
FAN
L1
RELAY
(HOT)
L2
M9212
A
B
W Y G
R
C
FAN
RELAY
1
L1
(HOT)
L2
M9214