White Rodgers 21D83M-843 User's Manual

White Rodgers Furnace User's Manual - 21D83M-843.
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21D83M-843

Integrated Single Stage 

Furnace Control Replacement Kit

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE 
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL 
INJURY AND/OR PROPERTY DAMAGE.

 

 DESCRIPTION

 

 PRECAUTIONS

INSTALLATION INSTRUCTIONS

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 

www.white-rodgers.com

www.emersonclimate.com

PART NO. 37-7337B

Replaces 37-7337A

1244

Installation should be done by a qualified heating and air 
conditioning contractor or licensed electrician.
If in doubt about whether your wiring is millivolt, line, or 
low voltage, have it inspected by a qualified heating and 
air conditioning contractor or licensed electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical 
codes and ordinances.
This control is a precision instrument, and should be 
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
Following installation or replacement, follow manufacturer’s 
recommended installation/service instructions to ensure 
proper operation.

WARNING

!

Failure to comply with the following warnings 

could result in personal injury or property damage.

FIRE HAZARD

• Donotexceedthespecifiedvoltage.
• Replace existing control with exact model

and dash number.

• Protectthecontrolfromdirectcontactwith

water (dripping, spraying, rain, etc.).

• Ifthecontrolhasbeenindirectcontactwith

water, replace the control.

• Label all wires before disconnection when

servicingcontrols.Wiringerrorscancause

improper and dangerous operation.

• Routeandsecurewiringawayfromflame.

SHOCK HAZARD

• Disconnectelectricpowerbeforeservicing.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutraland

line hot wires.

EXPLOSION HAZARD

• Shutoffmaingastoapplianceuntilinstalla-

tion is complete.

CAUTION

!

Donotshortoutterminalsongasvalveorprimary

control. Short or incorrect wiring may damage 

the thermostat.

The kit includes the 50A66-843 which is an automatic gas 

interrupted ignition control that employs a microprocessor 

to continually monitor, analyze, and control the proper 

operation of the gas burner, inducer, and fan.
These controls incorporate system fault analysis for quick 

gas flow shut-off, coupled with automatic ignition retry 

upon sensing a fault correction. 

Lennox

White-Rodgers Page

Reference

10M9301 

12L6901

32M8801 

56L8401

50A65-120 

50A65-121

3

PROCEDURE 1

Figure 1, Picture 

1, Table 1, Wiring 

Diagram 5001-6973

24L8501 

63K8901 

97L4801   

50A62-120 

50A62-121 

50A62-820

4

PROCEDURE 2

Figure 1, Picture 

2, Table 2, Wiring 

Diagram 5001-6972

100925-01 

100925-03

17W9201 

23W5101 

30W2501 

69M0801 

69M1501 

83M00 

21D83M-843 

50A66-122 

50A66-123

5

PROCEDURE 3

The 21D83M-843 kit will replace the following Controls:

Follow instructions for replacement of your model num-
ber under the heading 

INSTALLATION.

0.486048s