White Rodgers 21V51U-843 Universal Two-stage HSI Integrated Furnace Control Kit Wiring diagram

White Rodgers Heaters Wiring diagram - 21V51U-843 Universal Two-stage HSI Integrated Furnace Control Kit.
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INTEGRATED

FURNACE CONTROLS

21V51U-843 WIRING 

AND CONFIGURATION

The 50V51-843 has only one serviceable part –an automotive 

type fuse, which protects the low voltage transformer from dam-

age if the output is short-circuited. If the fuse has opened up, 

remove whatever caused the short circuit and replace the fuse 

with only a 3 amp automotive type fuse. If the fuse is not the 

causeofthecontrol’sproblem,replacetheentire50V51-843

control. There are no other user serviceable parts. 
Following installation or replacement, follow appliance manu-

facturer’srecommendedinstallationorserviceinstructionsto

insure proper operation.

Y

W1

W2

G

R

O

B/C

DEHUM

YLO

R

G

W2

W1

Y2

Y

THERMOSTAT

50V51-843 TYPICAL SYSTEM WIRING DIAGRAM

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

LEGEND

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

HOT

(LINE)

NEUTRAL

(LINE)

120 VAC

24 VAC CLASS II

TRANSFORMER

50V51-843

24 VAC

TH

TR

LINE

XFMR

EAC

HUM

CIRC N

HUM N
LINE N

XFMR N

EAC N

E2

INDUCER

HUMIDIFIER

(OPTIONAL)

ELECTRONIC

AIR CLEANER

(OPTIONAL)

CONDENSING

UNITS

IGNITOR

IGN

IND HI

IND LO

IND N

IGN N

FLAME

SENSOR

PROBE

2ND STAGE PRESSURE

SWITCH (N. O.)

HIGH LIMIT

(N. C.)

AUX. HIGH

LIMIT (N. C.)

1ST STAGE PRESSURE

SWITCH (N. O.)

GAS

VALVE

HLO

HLI

FP

PS1

MVL

MVH

GND

GND

PS2

MV COM

TR

TH

ROLLOUT

SWITCH (N. C.)

CIRCULATOR

CIRC.

INTER-

FACE

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181

TECHNICAL

 HELP

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