TYPICAL SYSTEM WIRING TABLE
50A55 |
| TERMINAL | SYSTEM COMPONENT |
TERMINAL |
| TYPE | CONNECTION |
| |||
W |
|
| low voltage thermostat W terminal (or equivalent) |
G |
| Terminal | low voltage thermostat G terminal (or equivalent) |
R |
| block with | low voltage thermostat R terminal (or equivalent) |
Y |
| captive | low voltage thermostat Y terminal (or equivalent) |
|
| screws | (2nd wire from Y terminal goes to 24 VAC HOT side of |
|
|
| compressor contactor coil) |
C |
|
| 24 VAC COMMON side of compressor contactor coil |
TWIN* |
|
| one wire twinning terminal |
|
|
|
|
MV (2 terminals) |
|
| gas valve (both gas solenoids are connected in parallel) |
TR |
|
| 24 VAC transformer (low voltage COMMON side) |
TH |
|
| 24 VAC transformer (low voltage HIGH side) |
RO1 |
|
| rollout switch OUTPUT |
RO2 |
| rollout switch INPUT | |
FP |
| connector | flame sensor probe* |
PS |
| & harness | pressure switch INPUT |
HLI |
|
| high limit INPUT |
HLO |
|
| high limit OUTPUT |
GND |
|
| MUST BE RELIABLY GROUNDED TO CHASSIS |
(unused terminal) |
|
|
|
|
|
|
|
IND |
| inducer HOT side | |
IGN |
| ignitor HOT side | |
| connector | ||
IND N |
| inducer NEUTRAL side | |
| & harness | ||
|
|
| |
IGN N |
|
| ignitor NEUTRAL side |
|
|
|
|
COOL |
| spade terminal | circulator blower COOL SPEED terminal |
|
|
|
|
HEAT |
| spade terminal | circulator blower HEAT SPEED terminal |
|
|
|
|
PARK (2 terminals) |
| spade terminal | unused circulator blower 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 |
|
|
|
|
*The twinning feature is available only on models with six screw terminals; one of these terminals will be designated “TWIN”. All
“TWIN” terminal.
†Maximum recommended flame probe wire length is 36 inches.
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