White Rodgers 50A66-743 Direct Replacement for Lennox Single Stage Nitride Ignition Installation Instructions

White Rodgers Heaters Installation Instructions - 50A66-743 Direct Replacement for Lennox Single Stage Nitride Ignition.
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WARNING

Failure  to  comply  with  the following 
warnings  could  result  in  personal  injury 
or property damage.

50A66-743

Integrated Furnace Control

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

 DESCRIPTION

Operator: Save these instructions for future use!

INSTALLATION INSTRUCTIONS

The 50A66-743 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.
Signals interpreted during continual surveillance of the thermostat 
and flame sensing element initiate automatic ignition of the 
burner, sensing of the flame, and system shut-off during normal 
operation.
These controls incorporate system fault analysis for quick gas 
flow shut-off, coupled with automatic ignition retry upon sensing 
a fault correction.

 

 PRECAUTIONS

Installation should be done by a qualified heating and air 
conditioning contractor or licensed electrician.
If in doubt about whether your wiring is mil ivolt, 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 components could cause 
the control to malfunction.
Following installation or replacement, follow manufacturer’s 
recommended installation/service instructions to ensure proper 
operation.

CONTENTS

Description  ........................................................  1

Precautions  .......................................................  1

Specifications  ....................................................  2

Installation  .........................................................  3

 

Mounting & Wiring

Operation  ...........................................................  6

System Lockout and Diagnostic Features ........... 7

Troubleshooting ................................................... 8

CAUTION

Do not short out terminals on gas valve or primary 
control. Short or incorrect wiring may damage 
the thermostat.

FIRE HAZARD

• Donotexceedthespecifiedvoltage.
• Replaceexistingcontrolwithexactmodelanddash

number.

• Protectthecontrolfromdirectcontactwithwater

(dripping, spraying, rain, etc.).

• Ifthecontrolhasbeenindirectcontactwithwater,

replace the control.

• Labelallwiresbeforedisconnectionwhenservicing

controls. Wiring errors can cause improper and 
dangerous operation.

• Routeandsecurewiringawayfromflame.

SHOCK HAZARD

• Disconnectelectricpowerbeforeservicing.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutralandline

hot wires.

EXPLOSION HAZARD

• Shutoffmaingastoapplianceuntilinstallationis

complete.

www.white-rodgers.com

www.emersonclimate.com

PART NO. 37-7473A

1313

50A66-743 Cross Reference Information

Lennox

White-Rodgers 

100925-01

23W51

69M0801     

50A66-122 

100925-02

23W5101

69M15

50A66-123

100925-03

30W25

69M1501 

50A66-743

17W92

30W2501

 

17W9201

69M08

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