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4kW applications
the A28AA-20 is the designated replacement
maintaining system efficiency and preventing ghost flows in complex residential or commercial heating zones
check for obstructions in the flue pipe
this pilot-operated solenoid valve features a rugged brass body and durable NBR seals
York S1-331-03742-000 Board Kit 320720-756 4kW applicationsThe York S1 331 03742 000 Board Kit is a critical OEM replacement control board designed specifically for the outdoor units of York, Luxaire, and Coleman HVAC systems. For a technician on a service call, this kit provides a direct drop in solution to restore high side communication and system logic. This outdoor control board features integrated EEV control (Electronic Expansion Valve), ensuring precise refrigerant metering and optimal superheat