and York packaged units

electrical surges

Simplified Field Service: Standardized terminal markings allow for faster installation and testing during maintenance calls

it ensures deep penetration into the plenum for accurate air temperature sensing

For technicians servicing Reznor UDAP

McDonnell & Miller 157S-RLS-MD Control R-410A and York packaged unitsThe McDonnell & Miller 157S RLS MD (Part Number 177251) is a high performance mechanical combination low water cut off and pump controller designed for commercial and industrial steam boilers. Engineered for high pressure applications up to 150 psi, this unit features a maximum differential operation that effectively prevents nuisance burner shutdowns in systems experiencing rapid water level fluctuations. Its integral water column design simplifies