White Rodgers 50A55-843 User Manual
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White Rodgers 50A55-843 User Manual

Universal integrated furnace control
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Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
The 50A55-843 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 thermo-
stat and flame sensing element initiate automatic ignition of the
burner, sensing of the flame, and system shut-off during normal
operation.
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 condi-
tioning 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.
CAUTION
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
CONTENTS
Description ......................................................... 1
Precautions ........................................................ 1
Specifications ..................................................... 2
Installation .......................................................... 3
Operation ........................................................... 6
Mounting Hole Template ..................................... 8
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
Universal Integrated Furnace Control

INSTALLATION INSTRUCTIONS

These controls incorporate system fault analysis for quick gas
flow shut-off, coupled with automatic ignition retry upon sensing
a fault correction.
WARNING
Failure to comply with the following
warnings could result in personal injury
or property damage.
FIRE HAZARD
• Do not exceed the specified voltage.
• 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 servic-
ing 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.
Printed in U.S.A.
50A55-843

DESCRIPTION

PRECAUTIONS

PART NO. 37-6265F
Replaces 37-6265E
0327

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Summary of Contents for White Rodgers 50A55-843

  • Page 1: Table Of Contents

    INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. The 50A55-843 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.

  • Page 2: Specifications

    The control is factory-set at 30 seconds heat delay- to-fan-on, 180 seconds heat delay-to- fan-off and 45 seconds cool delay-to- fan-off. See OPERATION section for further information. 50A55-843 2 times 30, 45 60/90/ 120/180 45, 90 60 minutes...

  • Page 3: Fire Hazard

    WARNING 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.). • Label all wires before disconnection when servic- ing controls.

  • Page 4: Typical System Wiring Diagram

    (LINE) HUMIDIFIER ELECTRONIC AIR CLEANER 50A55-843 furnace(s) TWINNING APPLICATIONS FLAME SENSOR PROBE LEGEND Low Voltage (24 VAC) Line Voltage (120 VAC) N. C. = Normally closed switch N. O. = Normally open switch TYPICAL SYSTEM WIRING DIAGRAM 120 VAC 24 VAC CLASS II...

  • Page 5: Typical System Wiring Table

    HUM N (optional) spade terminal * The twinning feature is available only on models with six screw terminals; one of these terminals will be designated “TWIN”. All 50A55-843 controls used in twinning applications must have the “TWIN” terminal. † Maximum recommended flame probe wire length is 36 inches.

  • Page 6: Option Switches

    OPERATION OPTION SWITCHES The option switches on the 50A55-843 control are used to determine the length of the cool delay-to-fan-off, heat delay-to- fan-on and heat delay-to-fan-off periods. The following table shows the time periods that will result from the various switch positions.

  • Page 7: Twinning Interface

    Power supplied to both furnaces must be from the same phase of the incoming 120 VAC power. Connect the TWIN screw terminals on the 50A55-843 of the furnaces to be twinned to each other using a single wire (14-22 AWG.).

  • Page 8: Mounting Hole Template

    MOUNTING HOLE TEMPLATE MOUNTING HOLE TEMPLATE FOR MOUNTING HOLE LOCATIONS 4.172 .007 (2 plcs.) 6.402 .010 (2 plcs.) Refer to page 3 of the installation instructions for proper installation.

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