White Rodgers 50A55-438 - Manual

WHITE-RODGERS DIVISION
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.

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.

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.

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.

WARNING

Failure to comply with the following
warnings could result in personal injury
or property damage.

CAUTION

CONTENTS

Description ............................................................. 1
Precautions ............................................................ 1
Specifications ......................................................... 2
Installation .............................................................. 3

Mounting & Wiring

Operation ............................................................... 6
Mounting Hole Template ........................................ 8

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.

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 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.

Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.