Common Technical Questions What is the difference between the A19BBC-2 and the older A19BBA-1

If the switch detects a temperature exceeding 145

Engineered for demanding commercial HVAC applications

Whether you are servicing a Copper-Fin II boiler or a commercial water heater

As a Copeland-approved component for POE oils

McDonnell & Miller 150S-M-MD-HD HEAD R-410A Common Technical Questions What isThe McDonnell & Miller 150S M MD HD serves as a direct replacement low water cut off head assembly for the 150S series combination pump controllers. Designed specifically for high pressure steam boiler applications, this heavy duty unit manages a maximum operating pressure of 150 psi (10. 5 kg cm). This specific model features a manual reset mechanism, which is critical for meeting safety codes in commercial boiler rooms where a manual restart is