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4 Square Inch Diaphragm Area
Common Questions: Why is my Reznor unit heater short cycling
Using it in steam applications may result in component failure
Prevents Thermal Shock: Maintains a steady 140-degree setpoint to safeguard cast iron and steel heat exchangers from rapid temperature fluctuations
the adhesive backing provides a high-strength bond directly to the clean housing surface
York S1-031-01976-000 Control Board 30067439-890 4 Square Inch Diaphragm AreaThe York S1 031 01976 000 Defrost Control Board is a critical OEM replacement part engineered specifically for York, Luxaire, and Coleman heat pump systems. Designed to manage the precise timing and termination of the defrost cycle, this HVAC control module prevents excessive ice accumulation on the outdoor coil, preserving system efficiency during low ambient operation. Unlike universal boards, this York heat pump defrost board integrates seamlessly
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