White Rodgers 50A55-438 User Manual
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
Printed in U.S.A.
50A55-438
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.
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
PART NO. 37-6102B
Replaces 37-6102A
0009
DESCRIPTION
INSTALLATION INSTRUCTIONS
The 50A55-438 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.
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.
stat and flame sensing element initiate automatic ignition of the
burner, sensing of the flame, and system shut-off during normal
operation.
WHITE-RODGERS
PRECAUTIONS
Operator: Save these instructions for future use!
These controls incorporate system fault analysis for quick gas
flow shut-off, coupled with automatic ignition retry upon sensing
a fault correction.
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.
warnings could result in personal injury
or property damage.
CAUTION
CONTENTS
Description ............................................................. 1
Precautions ............................................................ 1
Specifications ......................................................... 2
Installation .............................................................. 3
Precautions ............................................................ 1
Specifications ......................................................... 2
Installation .............................................................. 3
Mounting & Wiring
Operation ............................................................... 6
Mounting Hole Template ........................................ 8
Mounting Hole Template ........................................ 8
Installation should be done by a qualified heating and air
conditioning contractor or licensed electrician.
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.
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.
ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
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.
recommended installation/service instructions to ensure proper
operation.
FIRE HAZARD
• Do not exceed the specified voltage.
• Replace existing control with exact model and
• 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 servic-
ing controls. Wiring errors can cause improper
and dangerous operation.
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
• 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.
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
control. Short or incorrect wiring may damage the
thermostat.