McDonnell & Miller 354089 Switch Assembly 320788-702 or visible cracks in the

or visible cracks in the ceramic insulators

This valve utilizes a 3/8" inlet and a 1/2" outlet with ODF sweat connections for a standard 3-ton HVAC expansion valve setup

preventing short-cycling and optimizing heat exchange efficiency

provided the valve body is also rated for high-temperature service

The A70HA-14 is functionally identical to the A70HA-14C

McDonnell & Miller 354089 Switch Assembly 320788-702 or visible cracks in theThe McDonnell & Miller 354089 Switch Assembly, also designated as the Model SWA 150S M, is a critical replacement component engineered specifically for Series 150S and 157S low water cut offs and pump controllers. For technicians servicing steam boilers, this snap action switch assembly is the standard for maintaining precise liquid level control and ensuring high limit safety. Featuring a manual reset mechanism, this assembly requires professional