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50A62-820
Integrated Furnace Control
WHITE-RODGERS
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.
DESCRIPTION
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 interpr
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SPECIFICATIONS ELECTRICAL RATINGS [@ 77°F (25°C)]: TIMING SPECIFICATIONS Input Voltage: 25 VAC 50/60 Hz (All times are in seconds, unless noted otherwise) Max. Input Current @ 25 VAC: 0.455 amp Relay Load Ratings: 50A62-820 Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf PRE-PURGE 15 Ignitor Relay: 2.0 amp @ 120 VAC 50/60 Hz (resistive) TRIAL FOR IGNITION 4 Flame Current Requirements: PERIOD Minimum current to insure flame detection: 1 μa DC* IGNITION ACTIVATION 4 Maximum current for non-detectio
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INSTALLATION MOUNTING AND WIRING NOTE Replace 50A62 control as a unit - no user serviceable WARNING ! parts. Do not use on circuits exceeding specified volt- All wiring should be installed according to local and age. Higher voltage will damage control and national electrical codes and ordinances. could cause shock or fire hazard. 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 experi- CAUTION ! ence a minimum of vibrati
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TYPICAL SYSTEM WIRING DIAGRAM HOT NEUTRAL (LINE) (LINE) 120 VAC 24 VAC CLASS II TRANSFORMER TH 24 VAC TR 50A62 COOL HEAT CIRCULATOR FAN BLOWER M1 M2 LINE XFMR EAC INDUCER HUM IND IGN IGNITOR HUMIDIFIER GND GND CIR N LINE N XFMR N HUM N ELECTRONIC EAC N AIR CLEANER Y Y COMPRESSOR W W CONTACTOR G G R R THERMOSTAT C FLAME FP SENSOR PRESSURE SWITCH PROBE (N. O.) PS PS HL HIGH LIMIT (N. C.) RO1 ROLLOUT GND (N. C.) GAS RO2 MV VALVE MV TR TH LEGEND Low Voltage (24 VAC) Line Voltage (120 VAC) N. C. = No
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TYPICAL SYSTEM WIRING TABLE 50A62 TERMINAL SYSTEM COMPONENT TERMINAL TYPE CONNECTION W captive screw low voltage thermostat W terminal (or equivalent) G captive screw low voltage thermostat G terminal (or equivalent) R captive screw low voltage thermostat R terminal (or equivalent) Y low voltage thermostat Y terminal (or equivalent) captive screw 2nd wire from Y terminal goes to 24 VAC HOT side of compressor contactor coil C captive screw 24 VAC COMMON side of compressor contactor coil MV (
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OPERATION flame loss, the inducer blower remains energized to purge OPTION SWITCHES the system for 5 seconds. When the purge is complete, The option switches on the 50A62-820 control are used to the inducer blower and humidifier are de-energized and determine the length of the heat delay-to-fan-off period. the delay-to-fan-off period begins. After the delay-to-fan- The following table shows the time periods that will result off period ends, the circulator fan and electronic air from the various
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SYSTEM LOCKOUT FEATURES MANUAL FAN ON MODE When system lockout occurs, the gas valve is de-ener- If the thermostat fan switch is moved to the ON position, gized, the circulator blower is energized at heat speed, the circulator fan (fan speed) and optional electronic air and, if flame is sensed, the inducer blower is energized for cleaner are energized. When the fan switch is returned to 5 seconds. The diagnostic indicator light will flash or glow the AUTO position, the circulator fan and electro
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