White Rodgers 50A66-743 Thermostat User Manual


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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 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 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
• Donotexceedthespeciedvoltage.
• Replaceexistingcontrolwithexactmodelanddash
number.
• Protectthecontrolfromdirectcontactwithwater
(dripping, spraying, rain, etc.).
• Ifthecontrolhasbeenindirectcontactwithwater,
replace the control.
• Labelallwiresbeforedisconnectionwhenservicing
controls. Wiring errors can cause improper and
dangerous operation.
• Routeandsecurewiringawayfromame.
SHOCK HAZARD
• Disconnectelectricpowerbeforeservicing.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutralandline
hot wires.
EXPLOSION HAZARD
• Shutoffmaingastoapplianceuntilinstallationis
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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