McDonnell & Miller 63-M Low Water Cut Off Refrigerant Operating with a maximum pressure

Operating with a maximum pressure of 150 PSI and a flow capacity of 73 SCFM

Proper calibration of the mixing tube sensor ensures the gas valve responds accurately to load changes

featuring an outer circumference of 46 inches and a top width of 1/2 inch (A-section)

This differential pressure switch acts as an air proving switch

preventing water damage to the furnace plenum and surrounding structure

McDonnell & Miller 63-M Low Water Cut Off Refrigerant Operating with a maximum pressureThe McDonnell & Miller 63 M (Part Number 143100) is a heavy duty, float operated mechanical low water cut off designed for superior reliability in both hot water and steam boiler applications. Built for contractors who require a dependable safety interface, this unit features a manual reset mechanism and a robust No. 2 dual switch assembly. These switches provide simultaneous low water cut off protection and a dedicated circuit for an electric water