verify that the combustion air and venting are not obstructed

Wide Compatibility: Standard 1/8" NPT connection integrates seamlessly with RV and R series Maxitrol regulators

closed state whenever the 24VAC control signal is removed

The clear plastic dust cover protects the true clock face

McDonnell & Miller FPC-1000 Control 30067439-890 verify that the combustion airThe McDonnell & Miller FPC 1000 (Part No. 144704) is a field configurable electronic low water cut off (LWCO) engineered for high performance protection in both steam and hot water boiler applications. As the consolidated direct replacement for 750 MT 120, PSE 800, and Series 750 legacy controls, this "boilerwize" unit allows contractors to simplify truck stock by serving as a universal low water cut off. The FPC 1000 features a dual voltage design,