TYPICAL SYSTEM WIRING DIAGRAM
HOT
(LINE)
120 VAC
TH | 24 VAC | |
| 50A55 | |
| COOL | |
| HEAT | |
| PARK | |
| PARK | |
| LINE | |
| XFMR | |
| EAC | |
| HUM | |
| IND | |
| IGN | |
HUMIDIFIER |
| |
| CIR N | |
| LINE N | |
| XFMR N | |
ELECTRONIC | HUM N | |
EAC N | ||
AIR CLEANER | ||
| ||
| Y | |
| W | |
G | ||
IN OTHER |
| |
FURNACES | R | |
| ||
TWINNING | C | |
APPLICATIONS | ||
ONLY |
| |
TWIN* | TWIN* | |
| PS | |
| HLI | |
FLAME | HLO | |
SENSOR | FP | |
PROBE | RO1 | |
| GND | |
| RO2 | |
| MV | |
| MV | |
| TR | |
| TH | |
LEGEND |
|
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N. C. = Normally closed switch
N. O. = Normally open switch
NEUTRAL
(LINE)
24 VAC CLASS II TRANSFORMER
TR
CIRCULATOR
BLOWER
INDUCER
IGNITOR
Y
WCOMPRESSOR
CONTACTOR
G
R
THERMOSTAT
PRESSURE SWITCH (N. O.)
HIGH LIMIT | AUX. HIGH | |
(N. C.) | LIMIT (N. C.) | |
ROLLOUT |
|
|
|
| |
(N. C.) |
| GAS |
|
| VALVE |
|
|
|
4
