Markel 28163005 Relay 323055-751 and the 42S Series pump

and the 42S Series pump controllers

eliminating the risks associated with generic thermal overload switches

Built on a 56Z frame size with a 5/8" diameter flat shaft

We recommend verifying your specific model and serial number against the manufacturer’s parts list to ensure a correct match

Markel 28163005 Relay 323055-751 and the 42S Series pumpThe Markel 28163005 Relay is a heavy duty high power HVAC time delay relay designed for precise sequencing in residential and industrial heating systems. Rated for up to 2. 3kW (2300W) at 240V, this SPST sequencer relay is a critical component for managing lead lag operations, fan delays, and multi stage heating cycles. It is specifically engineered for full compatibility with Markel, TPI Corporation, and Raywall equipment, including high demand