White Rodgers 50A55-3797 Installation Manual download pdf (Page 4)

4

WIRING

50A55-3797

TERMINAL

TERMINAL

TYPE

SYSTEM COMPONENT

CONNECTION

TYPICAL SYSTEM WIRING TABLE

low voltage thermostat W terminal (or equivalent)

low voltage thermostat G terminal (or equivalent)

low voltage thermostat R terminal (or equivalent)

low voltage thermostat Y terminal (or equivalent)

(2nd wire from Y terminal goes to 24 VAC HOT side

of compressor contactor coil)

24 VAC COMMON side of compressor contactor coil

high limit OUTPUT

flame sensor probe

24 VAC transformer (low voltage HIGH side)

not used

not used

24 VAC transformer (low voltage COMMON side)

high limit INPUT

MUST BE RELIABLY GROUNDED TO CHASSIS

gas valve COMMON

pressure switch INPUT

not used

gas valve

inducer HOT side

ignitor HOT side

inducer NEUTRAL side

ignitor NEUTRAL side

W

G

R

Y

C

HLO (Pin 1)

FP (Pin 2)

TH (Pin 3)

(Pin 4)

(Pin 5)

TR (Pin 6)

HLI (Pin 7)

GND (Pin 8)

MV COM (Pin 9)

PS (Pin 10)

(Pin 11)

MV (Pin 12)

IND (Pin 1)

IGN (Pin 2)

IND-N (Pin 3)

IGN-N (Pin 4)

COOL

LO HEAT

HI HEAT

PARK (2 terminals)

LINE

XFMR

EAC (optional)

HUM (optional)

CIR N

LINE N

XFMR N

EAC N (optional)

HUM N (optional)

circulator blower COOL SPEED terminal

circulator blower LO HEAT SPEED terminal

circulator blower HI HEAT SPEED terminal

unused terminals

input voltage (120 VAC) HOT side

24 VAC transformer line voltage HOT side

electronic air cleaner HOT side

humidifier HOT side

circulator blower NEUTRAL terminal

input voltage (120 VAC) NEUTRAL side

24 VAC transformer line voltage NEUTRAL side

electronic air cleaner NEUTRAL side

humidifier NEUTRAL side

HLO

FS

HLI

PS

GND

MV

TH

TR

MV

COM

IND

IGN

IND

N

IGN

N

Te rminal

block with

captive

screws

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

spade terminal

1 2 3 4 5 6 7 8

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