Application of this type of control may cause flame
rollout on initial startup and could cause personal
injury and/or property damage.
Replace only with exact model number, including dash
number. Failure to use exact replacement control could
cause personal injury and/or property damage.
If in doubt about whether your wiring is millivolt, line, or low volt-
age, 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 components could cause
the control to malfunction.
50V64-743
Integrated Furnace Control
for Furnaces with Variable Fan Speed
INSTALLATION INSTRUCTIONS
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.
CONTENTS
Description ............................................................. 1
Precautions ............................................................ 1
Specifications ......................................................... 2
Operation ................................................................ 2
Installation .............................................................. 5
Mounting & Wiring
The 50V64-743 is a two-stage automatic gas interrupted ignition
control employing a microprocessor to continually monitor,
analyze, and control the proper operation of the gas burner and
inducer, and provide signal for proper operation of variable fan
speed timing.
Signals interpreted during continual surveillance of the two-
stage thermostat and flame sensing element initiate automatic
ignition of the burner, sensing of the flame, and system shutoff
during normal operation.
The control incorporates system fault analysis for quick gas
flow shutoff, coupled with automatic ignition retry upon sensing
a fault correction.
PART NO. 37-7565A
1503
www.white-rodgers.com
www.emersonclimate.com
DESCRIPTION
PRECAUTIONS
GENERAL PRECAUTION
!
To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
This control is not intended for use in locations where
it may come in direct contact with water. Suitable
protection must be provided to shield the control from
exposure to water (dripping, spraying, rain, etc.).
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
Following installation or replacement, follow appliance
manufacturers’ recommended installation/service
instructions to insure proper operation.
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
CAUTION
!
WARNING
!
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damage
thermostat and could cause personal injury and/or
property damage.
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