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the main control board may require a manual reset to clear the internal fault code
By providing continuous thermal feedback to the defrost control board
this HVAC defrost control relay handles switching for both the outdoor fan motor and the compressor contactor circuit simultaneously
maintaining the same specifications and performance
Patterson-Kelley 86-8335-0170 Air Flow Switch 321894-706 the main control board mayThe Patterson Kelley 86 8335 0170 Air Flow Switch is a critical safety and operational component designed for high performance commercial boilers and water heaters. As an OEM airflow switch replacement, this unit utilizes a sensitive differential pressure diaphragm to detect proper combustion air or exhaust flow. It is engineered to interface directly with Patterson Kelley industrial air flow switch control systems, ensuring the burner only fires when
