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| WIRING DIAGRAM | |
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| TYPICAL SYSTEM WIRING TABLE | |||
50M56 | TERMINAL | SYSTEM COMPONENT | ||||
TERMINAL |
| TYPE |
| CONNECTION | ||
W |
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| low voltage thermostat W terminal (or equivalent) | |
G |
| Terminal |
| low voltage thermostat G terminal (or equivalent) | ||
R |
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| low voltage thermostat R terminal (or equivalent) | |||
| block with |
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Y |
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| low voltage thermostat Y terminal (or equivalent) | |||
| captive |
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| (2nd wire from Y terminal goes to 24 VAC HOT side of | |||
|
| screws |
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| compressor contactor coil) | |||
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C |
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| 24 VAC COMMON side of compressor contactor coil | |
HLO (Pin 1) |
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| high limit OUTPUT | |
MV LO (Pin 2) |
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| gas valve first stage | |
TH (Pin 3) |
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| 24 VAC transformer (low voltage HIGH side) | |
PSO (Pin 4) |
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| pressure switch OUTPUT | |
RO OUT (Pin 5) |
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| rollout switch OUTPUT | |
TR (Pin 6) | HLO | PSO | HLI | PSI | 24 VAC transformer (low voltage COMMON side) | |
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HLI (Pin 7) | MV | RO | GND | RO | high limit INPUT | |
LO | OUT | IN | ||||
GND (Pin 8) | TH | TR | MV | MV | MUST BE RELIABLY GROUNDED TO CHASSIS | |
MV COM (Pin 9) | COM | HI | gas valve COMMON | |||
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PSI (Pin 10) |
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| pressure switch INPUT | |
RO IN (Pin 11) |
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| rollout switch INPUT | |
MV HI (Pin 12) |
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| gas valve second stage | |
IND (Pin 1) |
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| inducer HOT side | |
IGN (Pin 2) | IND | IGN | IND | IGN | ignitor HOT side | |
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N | N | inducer NEUTRAL side | ||||
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| ignitor NEUTRAL side | ||
COOL | spade terminal | circulator blower COOL SPEED terminal | ||||
LO HEAT | spade terminal | circulator blower LO HEAT SPEED terminal | ||||
HI HEAT | spade terminal | circulator blower HI HEAT SPEED terminal | ||||
PARK (2 terminals) | spade terminal | unused terminals | ||||
LINE | spade terminal | input voltage (120 VAC) HOT side | ||||
XFMR | spade terminal | 24 VAC transformer line voltage HOT side | ||||
EAC (optional) | spade terminal | electronic air cleaner HOT side | ||||
HUM (optional) | spade terminal | humidifier HOT side | ||||
CIR N | spade terminal | circulator blower NEUTRAL terminal | ||||
LINE N | spade terminal | input voltage (120 VAC) NEUTRAL side | ||||
XFMR N | spade terminal | 24 VAC transformer line voltage NEUTRAL side | ||||
EAC N (optional) | spade terminal | electronic air cleaner NEUTRAL side | ||||
HUM N (optional) | spade terminal | humidifier NEUTRAL side | ||||
FS | spade terminal | flame sensor probe† | ||||
†Maximum recommended flame probe wire length is 36 inches.
5
