Sequence Control: The thermal delay prevents simultaneous loading of two separate 240V circuits

and high-temp gaskets required for a standard top-end overhaul

63" WC to ensure accurate sensing of the inducer fan’s draft pressure for safe burner operation

the 151-101 is the metal blower housing only

Featuring an SPST (Single Pole Single Throw) configuration with an open-low action

Mcdonnell & Miller 354141 Long Barrel Probe R-410A Sequence Control: The thermal delayThe McDonnell & Miller 354141, also identified as the PA 800 U Long Barrel Probe, is a critical sensing component engineered for high performance water level detection in commercial and industrial HVACR applications. This extended barrel probe is designed specifically for use with the PS 801 U 120 and PS 802 U 24 low water cut off (LWCO) series. As a veteran technician knows, maintaining precise conductivity levels is essential for boiler safety; this