McDonnell & Miller 63-M Low Water Cut Off Refrigerant preventing water damage to the

preventing water damage to the furnace plenum and surrounding structure

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

The NEMA 1 enclosure (IP40 rated) and flat profile design allow for mounting in ultra-confined spaces with minimal side clearance

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

this specific kit includes the essential defrost control sensor/limit switch required for accurate temperature monitoring

McDonnell & Miller 63-M Low Water Cut Off Refrigerant preventing water damage to theThe 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