White Rodgers 50A62-820 User Manual
50A62-820
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 50A62-820 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.
Integrated Furnace Control
INST ALLA TION INSTRUCTIONS
DESCRIPTION
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, 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
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 components could cause the control to malfunction.
CONTENTS
Description......................................................... 1
Precautions........................................................ 1
Specifications..................................................... 2
Installation.......................................................... 3
Mounting & Wiring
Operation ........................................................... 6
PRECAUTIONS
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.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
This control is not intended for use in locations
where it may come in contact with water. Suitable protection must be provided to shield the
control from exposure to water (dripping, spraying, rain, etc.).
WARNING
!
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and
could cause shock or fire hazard.
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.
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
PART NO. 37-6266A
Printed in U.S.A.
0119
SPECIFICATIONS
ELECTRICAL RATINGS [@ 77°F (25°C)]:
Input Voltage: 25 VAC 50/60 Hz
Max. Input Current @ 25 VAC: 0.455 amp
Relay Load Ratings:
Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf
Ignitor Relay: 2.0 amp @ 120 VAC 50/60 Hz
(resistive)
Flame Current Requirements:
Minimum current to insure flame detection: 1 µa DC*
Maximum current for non-detection: 0.1 µa DC*
Maximum allowable leakage resistance: 100 M ohms
*Measured with a DC microammeter in the flame probe
lead
OPERATING TEMPERATURE RANGE:
-40° to 175°F (-40° to 80°C)
HUMIDITY RANGE:
5% to 93% relative humidity (non-condensing)
MOUNTING:
Surface mount multipoise
Timing Specs: (@ 60 Hz)
maximum
Flame Establishing Time: 2 sec
Flame Failure Response Time: 2 sec
(All times are in seconds, unless noted otherwise)
TIMING SPECIFICATIONS
50A62-820
PRE-PURGE
TRIAL FOR IGNITION
PERIOD
IGNITION ACTIVATION
PERIOD
RETRIES
VALVE SEQUENCE
PERIOD
INTERPURGE
POST-PURGE
LOCKOUT TIME
HEAT DELAY-TO-FAN-ON
HEAT DELAY-TO-FAN-OFF*
COOL DELAY-TO-FAN-ON
COOL DELAY-TO-FAN-OFF
IGNITOR WARM-UP
HUMIDIFIER
15
4
4
4 times
12
15
5
122
45
60/90/
120/180
0
0
20
YES
Gases Approved: Natural, Manufactured, Mixed, Liquid
Petroleum, and LP Gas Air Mixtures are all approved for
use.
ELECTRONIC AIR
CLEANER
* This time will vary depending on option
switch position. The control is factory-set
at 60 sec. heat delay-to-fan-off. See
OPERATION section for further
information.
YES
2
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.
Failure to earth ground the appliance or reversing the neutral and hot wire connection to the line
can cause shock hazard.
Shut off main gas to heating system until installation is complete.
Route and secure all wiring as far from flame
as practical to prevent fire and/or equipment
damage.
NOTE
Replace 50A62 control as a unit - no user serviceable
parts.
All wiring should be installed according to local and
national electrical codes and ordinances.
The 50A62 control may be mounted only in a control box
of a Lennox furnace.
The control must be secured to an area that will experience a minimum of vibration and remain below the maximum ambient temperature rating of 175°F. The control is
approved for minimum ambient temperatures of -40°F.
Any orientation is acceptable.
Refer to the wiring diagram and wiring table when con-
necting the 50A62 control to other components of the
system.
UL approved, 105°C rated 18 gauge, stranded, 2⁄64” thick
insulation wire is recommended for all low voltage safety
circuit connections. Refer to 50A62 specification sheet
for recommended terminals to mate with those on the
control.
UL approved 105°C rated 16 gauge min., stranded, 4⁄64”
thick insulation wire is recommended for all line voltage
connections. Refer to 50A62 specification sheet for
recommended terminals to mate with those on the
control.
After installation or replacement, follow appliance
manufacturer’s recommended installation or service
instructions to ensure proper operation.
3
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