and MGC-9DP series gas-fired hot water boilers

Manual Reset Mechanism: Ensures the system remains offline until a qualified technician identifies and resolves the over-temperature trigger

Using it on non-specified units can lead to mounting failure or electrical issues

Using OEM York HVAC parts ensures that the electrical specifications match the system's control circuit requirements precisely

effectively preventing liquid floodback to the compressor while mitigating evaporator coil icing during deep cycles

McDonnell & Miller FS7-4E Switch THPU32HP7Y and MGC-9DP series gas-fired hotThe McDonnell & Miller FS7 4E (Part Number 120100) is a heavy duty industrial liquid flow switch designed specifically for hazardous environments. Featuring a NEMA 7 and 9 explosion proof enclosure, this unit is rated for Class I, Groups C and D, and Class II, Groups E, F, and G, ensuring safe operation in volatile atmospheres. The 1 1 4" NPT brass body utilizes a sealed tube construction and a magnetic switching mechanism to provide reliable SPDT