WIRING
| TYPICAL SYSTEM WIRING DIAGRAM |
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HOT |
| NEUTRAL |
(LINE) | 120 VAC | (LINE) |
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| 24 VAC CLASS II |
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| TRANSFORMER |
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TH | 24 VAC | TR |
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| 50A66 |
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| FAN |
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| COOL |
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| HEAT |
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| CIRCULATOR |
| PARK |
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| BLOWER | |
| PARK |
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| LINE |
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| XFMR |
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| EAC |
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| HUM |
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| PARK |
| INDUCER |
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| IND |
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| IGN |
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HUMIDIFIER | IGN N |
| IGNITOR |
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IND N |
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ELECTRONIC | 120 VOLT NEUTRAL |
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AIR CLEANER |
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| Y |
| Y |
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| W |
| W | COMPRESSOR |
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| CONTACTOR |
| G |
| G |
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24 V | R |
| R |
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| THERMOSTAT |
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HUMIDIFIER | C |
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FLAME | 24 V HUM | (E2) |
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FP | (E33) |
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SENSOR | PRESSURE SWITCH (N. O.) | |||
PROBE | PSI |
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| PSO |
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| HLI |
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| HLO |
| HIGH LIMIT | AUX. HIGH |
| RO OUT | |||
| GND |
| (N. C.) | LIMIT (N. C.) |
| RO IN |
| ROLLOUT | 2 STAGE |
| MV LO |
| (N. C.) | |
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| GAS | ||
| MV HI |
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| MV COM |
| VALVE | |
| TR |
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| TH |
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LEGEND |
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Low Voltage (24 VAC) |
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| HLO | PSO | HLI | PSI |
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Line Voltage (120 VAC) |
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| MV | RO | GND | RO |
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| LO | OUT | OUT | ||
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N. C. = Normally closed switch |
| N | N |
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| COM |
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| IND IGN | IND | IGN | TH | TR | MV | MV |
N. O. = Normally open switch | |||||||
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