COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
9.3 UHA(S) Series Internal Wiring Diagram
AXIAL FAN | AXIAL FAN (UH 300, 350, 400 ONLY) |
|
BLACK
WHITE
GREEN
BLACK
BLOWER
WHITE
GREEN
GREEN | L2 | L1 |
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|
WHITE | WHITE |
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| |
|
|
|
| |
WHITE |
| BLACK | GREEN | BLACK |
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| |||
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| ||
GREEN |
|
|
| GAS VALVE |
| 3 | 1 |
| |
| BLACK | |||
TRANSFORMER |
|
| ||
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|
|
| |
45
PRESSURE SWITCH | BLUE |
|
BLUE
BLUE YELLOW
VAC24 HOT | GROUND | 3 | 2 | 1 |
|
| 6 | 5 | 4 |
YELLOW
BROWN
LIMIT SWITCH | ORANGE |
|
(UH 300, 350, |
|
|
400 ONLY) |
|
|
| ORANGE |
|
MANUAL RESET LIMIT SWITCH | LIMIT SWITCH | |
(UH 30 - 125 ONLY) |
|
|
SENSE |
| BLACK |
ELECTRODEBLACK
BLACK
BLACK
|
| R | R = 24 VAC TO THERMOSTAT (RED) | |
|
|
| ||
ORANGE |
| G | G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN) | |
ORANGE | W | |||
| W= HEAT DEMAND INPUT FROM THERMOSTAT (WHITE) | |||
FLAME |
| C | C = COMMON SIDE OF TRANSFORMER | |
IGNITION MODULE |
| |||
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| |||
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| THERMOSTAT INPUT: FIELD SUPPLIED | |
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|
| BLACK | |
| ACC | CMB BLOWER | BLACK | |
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| |||
|
| L1 |
| |
NOTE:
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 and 600 volts. For supply connections use No. 14 AWG or larger wires.
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