| TYPICAL SYSTEM WIRING DIAGRAM |
HOT | NEUTRAL |
(LINE) | (LINE) |
| 120 VAC |
|
| 24 VAC CLASS II |
| |
|
| TRANSFORMER |
| |
TH | 24 VAC | TR |
| |
| 50A55 |
|
| |
| COOL |
|
| |
| HEAT |
| CIRCU- | |
| PARK |
| LATOR | |
| PARK |
| BLOWER | |
| LINE |
|
| |
| XFMR |
|
| |
| EAC |
|
| |
| HUM |
|
| |
INDUCER | IND |
|
| |
IGN | IGNITOR |
| ||
HUMIDIFIER | IND N |
| ||
IGN N |
|
| ||
|
| |||
| CIR N |
|
| |
| LINE N |
|
| |
| XFMR N |
|
| |
ELECTRONIC | HUM N |
|
| |
AIR CLEANER | EAC N |
|
| |
|
|
| ||
| Y | Y |
| |
| W | W | COMPRESSOR | |
|
|
| CONTACTOR | |
| G | G |
| |
| R | R |
| |
| C | THERMOSTAT |
| |
|
|
| ||
|
| PRESSURE SWITCH (N. O.) | ||
| PS |
|
| |
| HLI |
|
| |
FLAME | HLO | HIGH LIMIT | AUX. HIGH | |
SENSOR | FP | |||
(N. C.) | LIMIT (N. C.) | |||
PROBE |
|
|
| |
| GND |
| GAS | |
|
|
| ||
| MV |
| VALVE | |
| MV |
|
| |
| TR |
|
| |
| TH |
|
| |
LEGEND |
|
|
| |
Low Voltage (24 VAC) |
|
|
| |
Line Voltage (120 VAC) |
|
|
| |
N. C. = Normally closed switch |
|
|
| |
N. O. = Normally open switch |
|
|
| |
4