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White Rodgers 50A55-143 User Manual

Integrated furnace control
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WHITE-RODGERS
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 50A55-143 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.
GENERAL PRECAUTION
!
Application of this type of control may cause
flame rollout on initial start-up and could cause
personal injury and/or property damage.
Replace only with exact model number, includ-
ing dash number. Failure to use exact replace-
ment control could cause personal injury and/or
property damage.
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.
CONTENTS
Description ......................................................... 1
Precautions ........................................................ 1
Specifications ..................................................... 2
Installation .......................................................... 3
Operation ........................................................... 6
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
Integrated Furnace Control

INSTALLATION INSTRUCTIONS

To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause im-
proper and dangerous operation.
This control is not intended for use in locations
where it may come in contact with water. Suit-
able protection must be provided to shield the
control from exposure to water (dripping, spray-
ing, rain, etc.).
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage control and
could cause shock or fire hazard.
Do not short out terminals on gas valve or pri-
mary control to test. Short or incorrect wiring will
damage thermostat and could cause personal
injury and/or property damage.
Printed in U.S.A.
50A55-143

DESCRIPTION

PRECAUTIONS

CAUTION
!
WARNING
!
PART NO. 37-6095A
9919

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Summary of Contents for White Rodgers 50A55-143

  • Page 1: Table Of Contents

    FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. The 50A55-143 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

    INTERPURGE POST-PURGE LOCKOUT TIME maximum DELAY TO HEAT ON 0.8 sec 2.0 sec DELAY TO HEAT OFF DELAY TO COOL ON DELAY TO COOL OFF AUTO RESET HUMIDIFIER ELECTRONIC AIR CLEANER 50A55-143 2 times 15/30/ 45/60 60/90/ 120/180 70 minutes...

  • Page 3: Installation

    MOUNTING AND WIRING WARNING Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. CAUTION To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.

  • Page 4: Typical System Wiring Diagram

    (LINE) HUMIDIFIER ELECTRONIC AIR CLEANER 50A55-143 IN OTHER FURNACES 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...

  • Page 5: Typical System Wiring Table

    TYPICAL SYSTEM WIRING TABLE 50A55 TERMINAL TERMINAL TYPE Terminal block with captive screws TWIN MV (2 terminals) 12-pin connector & harness (unused terminal) 2-pin connector & harness spade terminal COOL spade terminal HEAT spade terminal PARK (2 terminals) spade terminal LINE spade terminal XFMR...

  • Page 6: Operation

    OPERATION OPTION SWITCHES The option switches on the 50A55-143 control are used to determine the length of the heat delay-to-fan-off periods. The following table shows the time periods that will result from the various switch positions. OPTION SWITCH POSITIONS HEAT delay-...

  • Page 7: Twinning Interface

    1. Power supplied to both furnaces must be from the same phase of the incoming 120 VAC power. 2. Connect the TWIN screw terminals on the 50A55-143 of the furnaces to be twinned to each other using a single wire (14-22 AWG.).
  • Page 8 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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