White Rodgers 50A55-843 Universal Silicon Carbide Integrated Furnace Control Wiring diagram

White Rodgers Heaters Wiring diagram - 50A55-843 Universal Silicon Carbide Integrated Furnace Control.
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TH

TR

MV

MV

GND

FP

HLO

HLI

PS

C

R

G

W

Y

EAC N

HUM N

XFMR N

LINE N

CIR N

IGN

IND

IGN N

IND N

HUM

EAC

XFMR

LINE

PARK

PARK

HEAT

COOL

IGNITOR

Y

W

G

R

THERMOSTAT

GAS

VALVE

HIGH LIMIT

(N. C.)

ROLLOUT

(N. C.)

AUX. HIGH

LIMIT (N. C.)

PRESSURE SWITCH (N. O.)

FLAME

SENSOR

PROBE

COMPRESSOR

CONTACTOR

ELECTRONIC

AIR CLEANER

HUMIDIFIER

INDUCER

CIRCULATOR

BLOWER

50A55

24 VAC

120 VAC

24 VAC CLASS II

TRANSFORMER

HOT

(LINE)

NEUTRAL

(LINE)

TH

TR

Low Voltage (24 VAC)
Line Voltage (120 VAC)

LEGEND

N. C. = Normally closed switch
N. O. = Normally open switch

RO1

RO2

TYPICAL SYSTEM WIRING DIAGRAM

TWIN*

TWIN*

50A55-843

in other

furnace(s)

TWINNING

APPLICATIONS

ONLY

50A55-843

WIRING AND

CONFIGURATION

Flame Current Requirements: 

Minimumcurrenttoinsureflamedetection.............1 µa DC➀ 

Maximum current for non-detection .....................0.1 µa DC➀ 

Maximumallowableleakageresistance .............100 M ohms 

Flame establishing time ......................0.8 seconds maximum 

Flame failure response time ...............2.0 seconds maximum
➀ 

MeasuredwithaDCmicroammeterintheflameprobelead

50A55-843

www.white-rodgers.com

183

TECHNICAL

 HELP

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