![9.3 UHA[S] Series Internal Wiring Diagram](/images/new-backgrounds/34904/3490443x1.webp)
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
9.3 UHA[S] Series Internal Wiring Diagram
AXIAL FAN
AXIAL FAN (UHA 300, 350, 400)
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| WHITE | GREEN |
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| L2 | L1 |
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| GREEN | WHITE |
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| WHITE |
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| BLACK |
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Flue |
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| WHITE |
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| BLACK | GREEN | BLACK |
Blower |
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| GREEN |
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| GAS VALVE | ||
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| 3 | 1 |
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| BLACK | |||
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| WHITE |
| TRANSFORMER |
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| GREEN |
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| 4 | 5 |
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| BLUE |
| YELLOW |
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| YELLOW |
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PRESSURE SWITCH |
| BLUE |
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| BROWN | ||
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| BLUE | 24 VAC | HOT | GROUND | 3 | 2 | 1 |
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| 6 | 5 | 4 |
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LIMIT SWITCH | ORANGE |
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| R |
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| R = 24 VAC TO THERMOSTAT (RED) |
(UHA 300, |
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350, 400 |
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| ORANGE |
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| G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN) | |
| ORANGE |
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| ORANGE | W |
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| W= HEAT DEMAND INPUT FROM THERMOSTAT (WHITE) | |||||
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| FLAME |
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| C |
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| C = COMMON SIDE OF TRANSFORMER |
MANUAL RESET LIMIT SWITCH | LIMIT SWITCH |
| IGNITION MODULE |
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(UHA 30 - 125 ONLY) |
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| THERMOSTAT INPUT: FIELD SUPPLIED | |
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SENSE |
| BLACK |
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| BLACK | |
ELECTRODE |
| BLACK |
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| BLACK |
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| ACC |
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| CMB BLOWER |
| BLACK | |
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| L1 |
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| BLACK |
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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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