White Rodgers 50A66-743 - Manual
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Table of Contents:
- Page 2 – SPECIFICATIONS; Flame Current Requirements:; ANSI standard rated module timing.
- Page 3 – WARNING; INSTALLATION; ” thick; FIRE HAZARD; • Protect the control from direct contact with water; SHOCK HAZARD; • Shut off main gas to appliance until installation is
- Page 4 – TYPICAL SYSTEM WIRING DIAGRAM; WIRING
- Page 5 – TYPICAL SYSTEM WIRING TABLE
- Page 6 – Set switch; HEAT MODE
- Page 7 – SYSTEM LOCKOUT FEATURES; SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES; Interrupt the 24 VAC power at the control for at least; DIAGNOSTIC FEATURES
- Page 8 – TROUBLESHOOTING
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 specified 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 flame.
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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Summary
2 SPECIFICATIONS ELECTRICAL RATINGS [@ 77°F (25°C)]: Input Voltage: 25 VAC 50/60 Hz Max. Input Current @ 25 VAC: 0.45 amp Relay Load Ratings: Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pfIgnitor Relay: 2.0 amp @ 120 VAC 50/60 Hz (resistive)Inducer Relay: 2.2 FLA–3.5 LRA @ 120 VACCirculator Relay: 14...
3 WARNING INSTALLATION Do not short out terminals on gas valve or primary control. Short or incorrect wiring may damage the thermostat. MOUNTING AND WIRING All wiring should be installed according to local and na-tional electrical codes and ordinances.The control must be secured to an area that will...
4 FP 24 V HUM C R G W Y 120 VOLT NEUTRAL IGN IND IGN N IND N HUM EAC XFMR LINE PARK PARK PARK HEAT COOL FAN IGNITOR Y W G R THERMOSTAT COMPRESSOR CONTACTOR ELECTRONIC AIR CLEANER HUMIDIFIER INDUCER CIRCULATOR BLOWER 50A66 24 VAC 120 VAC 24 VAC CLASS II TRANSFORMER HOT (LINE) NEUTRAL (LINE) FLAME SEN...
