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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
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
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
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.
WHITE-RODGERS
PRECAUTIONS
PART NO. 37-6095A
9919
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.
GENERAL PRECAUTION
!
CAUTION
!
WARNING
!
CONTENTS
Description ......................................................... 1
Precautions ........................................................ 1
Specifications ..................................................... 2
Installation.......................................................... 3
Mounting & Wiring
Operation ........................................................... 6