T8775A,C THE DIGITAL ROUND™
4.Tap the provided wall anchors into the drilled holes until they are flush with the wall.
5.Pull the thermostat wires through the wiring hole on the wallplate and reposition the wallplate over the wall anchors.
6.Attach the wallplate to the wall with the screws pro- vided.
7.After wiring the wallplate, plug the hole to prevent drafts from affecting the thermostat; see Wiring section.
WIRING
IMPORTANT
Use 18-gauge wire to wire the T8775A,C
Thermostats.
All wiring must comply with local electrical codes and ordinances. Disconnect the power supply to prevent electrical shock or equipment damage.
NOTE: To ensure proper mounting of thermostat, restrict all wiring to the shaded area. See Fig. 5.
MOUNTING
HOLES
WIRING | RESTRICT WIRING |
HOLE | TO SHADED AREA |
| M19680 |
Fig. 5. Restrict T8775 wiring to shaded area.
The shape of the terminals permits insertion of straight or wraparound wiring connections; either method is acceptable. See Fig. 6.
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).
FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM).
M19496
Fig. 6. T8775 wiring connections.
Refer to Fig. 7 through 11 for typical wiring diagrams.
| R |
| W |
1 | HEATING |
RELAY OR | |
| VALVE COIL |
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M19513
Fig. 7. Typical hookup of T8775A in a heat-only system.
| O | |
| B | |
2 | Rc | |
| G | |
R | Y | |
W | ||
|
1 | HEATING | FAN |
RELAY OR | ||
| VALVE COIL | RELAY |
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER. | M19514 |
Fig. 8. Typical hookup of T8775C in heat-only system with
fan.
| O | |
| B | |
2 | Rc | |
| G | |
R | Y | |
W | ||
|
1 | HEATING | COMPRESSOR | FAN |
| |||
| RELAY OR | CONTACTOR | RELAY |
| VALVE COIL |
|
|
| 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS | ||
| AND OVERLOAD PROTECTION AS REQUIRED. | ||
2 FACTORY INSTALLED JUMPER. | M19515 |
Fig. 9. Typical hookup of T8775C in heat-cool system with
single transformer.
4 |
