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DIRECT
REPLACEMENT
50A66-743
50A66-743 LENNOX NITRIDE IGNITION
INTEGRATED HSI FURNACE CONTROL
Controls Gas Valve, Ignitor, Blower, Inducer, Humidifier
and Air Cleaner
FEATURES
• Includes diagnostic indicator flash codes.
• 3 fan speeds.
• Remote flame sense.
• Humidifier and electronic air cleaner connections (optional).
SPECIFICATIONS
Input Voltage . . . . . . . . . . 25 VAC 50 / 60 Hz
Maximum Input Current @ 25 VAC . . 0.45 amp
Valve Relay . . . . . . . . . . . 1.5 amp @ 25 VAC 50 / 60 Hz 0.6 pf
Ignitor Relay . . . . . . . . . . 2.0 amp @ 120 VAC 50 / 60 Hz (resistive)
Inducer Relay . . . . . . . . . . 2.2 FLA – 3.5 LRA @ 120 VAC
Circulator Relay . . . . . . . . . 14.5 FLA – 25.0 LRA @ 120 VAC
Operating Temperature Range . . . -40 to +175°F (-40 to +79°C)
Humidity Range . . . . . . . . . 5% to 93% relative humidity (non-condensing)
Model
Number Pre-Purge
Delay Heat Delay Cool Auto Reset
ON OFF ON OFF
50A66-743 15 45 60 / 90 / 120 / 180 2 2/45 60 minutes
50A66-743 Replaces:
Lennox White-Rodgers
100925-01 30W25 50A66-122
100925-02 30W2501 50A66-123
100925-03 69M08
17W92 69M0801
17W9201 69M15
23W51 69M1501
23W5101
CROSS REFERENCE
LENNOX
INTEGRATED HSI MODULE
51
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