White Rodgers 21D83M 843 Replacement Kit For Lennox Single Stage Nitride Ignition Specification Sheet 138273_21D83M_843_ModuleKit_SS

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Features:

• Includes diagnostic indicator flash codes

• 3 fan speeds

• Remote flame sense

• Humidifier and electronic air cleaner connections (optional)

Integrated Furnace

Control – 21D83M-843

Single-Stage/HSI Integrated

Furnace Control Kit

21D83M-843

Nitride Ignition

Integrated Furnace Control

Controls Gas Valve, Ignitor, Blower, Inducer,

Humidifier and Air Cleaner. Replaces Lennox models.

Kit includes:

1 – 50A66-843 Ignition Control Board

1 – Wiring harness (9-pin to 12-pin)

1 – Wiring harness (4-pin to 6-pin)

1 – Mounting panel

4 – Stand-off fasteners

1 – Circuit breaker

1 – 4" blue wire

2 – Wiring diagrams

Replace

the Original

with the Original.

21D83M-843 simplifies installation and ensures

peak system performance.

OEM Replacement

WR-8273

Saint Louis, Missouri Markham, Ontario

314-553-3600 905-948-3411

www.white-rodgers.com

www.emersonclimate.com

The Emerson logo is a trademark and

a service mark of Emerson Electric Co.

21D83M-843

Pre-purge: 15

Heat delay to fan ON 45

Heat delay to fan OFF 60/90/120/180

Cool delay to fan ON 2

Cool delay to fan OFF 2/45

Auto reset 60 minutes

Timing Specifications

(All times are in seconds unless noted otherwise)

10M9301

12L6901

32M8801

56L8401

24L8501

63K8901

97L4801

100925-01

100925-03

17W9201

23W5101

30W2501

69M0801

69M1501

83M00

50A65-120

50A65-121

50A62-120

50A62-121

50A62-820

21D83M-843

50A66-122

50A66-123

Lennox White-Rodgers

21D83M-843 Cross Reference

21D83M-843 Replaces:

TH

TR

MV

MV

GND

FP

24 V HUM

HLO

HLI

PS

C

R

G

W

Y

IGN

IND

IGN N

IND N

HUM

EAC

XFMR

LINE

PARK

PARK

PARK

HEAT

COOL

FAN

IGNITOR

Y

W

G

R

THERMOSTAT

GAS

VALVE

24 V

HUMIDIFIER

HIGH LIMIT

(N. C.)

ROLLOUT

(N. C.)

AUX. HIGH

LIMIT (N. C.)

PRESSURE SWITCH (N. O.)

COMPRESSOR

CONTACTOR

ELECTRONIC

AIR CLEANER

HUMIDIFIER

INDUCER

CIRCULATOR

BLOWER

50A66

24 VAC

120 VAC

24 VAC CLASS II

TRANSFORMER

HOT

(LINE)

NEUTRAL

(LINE)

FLAME

SENSOR

PROBE

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

(E33)

(E2)

120 VOLT

NEUTRAL

Specifications

Input Voltage: 25 VAC 50 / 60 Hz

Maximum Input Current @ 25 VAC: 0.45 amp

Valve Relay: 1.5 amp @ 25 VAC 50 / 60 Hz 0.6 pf

Ignitor Relay: 2.0 amp @ 120 VAC 50 / 60 Hz (resistive)

Inducer Relay: 2.2 FLA – 3.5 LRA @ 120 VAC

Circulator Relay: 14.5 FLA – 25.0 LRA @ 120 VAC

Operating Temperature Range: -40 to +175°F (-40 to +79°C)

Humidity Range: 5% to 93% relative humidity (non-condensing)

Nitride Ignition Integrated Furnace Control

Controls Gas Valve, Ignitor, Blower, Inducer, Humidifier and Air Cleaner. Replaces Lennox models.

Single-Stage

HSI Integrated

Furnace Control Kit

21D83M-843

OEM

Replacement