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The 1/4" male SAE flare connector provides a secure
the start relay is the primary suspect
it utilizes a non-stick PTFE (Teflon) disc-to-metal seat
Always verify the opening and closing temperatures against your unit's wiring diagram to ensure proper safety compliance
McDonnell & Miller 310462 Switch Assembly R-410A The 1/4" male SAE flareThe McDonnell & Miller 310462 (Model SWA 150S) is a heavy duty snap action switch assembly designed for precise low water cut off and pump controller transitions. This automatic reset assembly is a critical replacement component for Series 150S and Series 157S mechanical boiler controls. Built to manage steam boiler water levels up to a maximum operating pressure of 150 psi, the SWA150S provides reliable SPDT switching to prevent dry fire conditions
