Always verify the part number against your specific burner’s technical data tag before installation
Reliable Switching: SPNO architecture ensures the ignition control board receives an accurate signal only when safe airflow is established
Proper installation requires verifying the inches of water column rating against the OEM specifications listed on the furnace data plate
it must never be permanently bypassed
this board provides dual circuits capable of managing up to three auxiliary heating stages
York S1-7945-3551 Transformer Always verify the part numberThe York S1 7945 3551 Transformer is a critical OEM replacement part designed for precision voltage regulation in York, Coleman, and Evcon HVAC systems. This 120V to 24V step down transformer features a 15VA power rating, providing a stable low voltage current to reach the control board, contactors, and thermostats. Built as a Class 2 transformer, it ensures proper isolation for the secondary circuit, protecting sensitive electronic components from
