UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
9.3 Internal Wiring Diagram
L2 L1
FLUE |
|
BLOWER |
|
| WHITE |
| GREEN |
PRESSURE SWITCH | BLUE |
| |
| BLUE |
LIMIT SWITCH (UHD 300, 350, 400 ONLY) | ORANGE |
| |
| ORANGE |
MANUAL RESET LIMIT SWITCH (RESIDENTAL UNITS ONLY) | LIMIT SWITCH |
SENSE | BLACK |
| |
ELECTRODE | BLACK |
| BLACK |
24 VAC HOT
ORANGE
FLAME
WHITE |
| |
WHITE | BLACK | GREEN |
| ||
GREEN |
| GAS VALVE |
3 | 1 | BLACK |
TRANSFORMER |
| |
|
| |
4 | 5 |
|
| BLUE |
| YELLOW |
|
| |
|
|
| YELLOW |
| ||
|
|
|
|
| BROWN | |
GROUND |
|
|
|
|
| |
6 | 5 | 4 |
|
|
| |
| 3 | 2 | 1 |
|
|
|
|
|
|
| R |
| R = 24 VAC TO THERMOSTAT (RED) |
|
|
|
| G |
| G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN) |
| ORANGE | W |
| W = HEAT DEMAND INPUT FROM THERMOSTAT (WHITE) | ||
|
|
|
| C |
| C = COMMON GROUND TO THERMOSTAT |
|
|
|
|
|
| |
IGNITION MODULE
THERMOSTAT INPUT: FIELD SUPPLIED
BLACK
CMB BLOWER
ACC
L1
IMPORTANT:
For field wiring into service junction box, or if any of the original wire supplied with the heater
must be replaced, it must be replaced with wiring material having a temperature rating of at least 105 °C (221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.
20