McDonnell & Miller Low Water Cut-offs are specially designed to protect hot water / steam boilers from the hazards of a low water condition. In operation they will interrupt the electrical current to the firing device, if the water in the system drops below the boiler manufacturers’ minimum safe water level. Our low water cut-offs also provide an additional circuit for a water feeder or a low water alarm, should you desire to install one, for additional protection.
We recommend that secondary (redundant) Low Water Cut-Off controls be installed on all steam boilers with heat input greater than 400,000 BTU/hour or operating above 15 psi of steam pressure. At least two controls should be connected in series with the burner control circuit to provide safety redundancy protection should the boiler experience a low water condition. Moreover, at each annual outage, the low water cut-offs should be dismantled, inspected, cleaned, and checked for proper calibration and performance.
Series 1575
Low Water Cut-off / Pump Controller, Probe Type
Series 42S
Low Water Cut-off / Pump Controller, Float Type
Series 150S/157S
Low Water Cut-off / Pump Control, Float Type
Series 93/94/193/194
Low Water Cut-off / Pump Control, Float Type
RB-122-E
Self-cleaning Low Water Cut-off, Probe Type
Series 764
Heavy Duty Low Water Cut-off, Float Type, Side tapping
Series 69
Insertion Low Water Cut-off, Float Type
RB-24E
Self-cleaning Low Water Cut-off, Probe Type
Series PSE
Self-cleaning Low Water Cut-off, Probe Type, with resistance safety
Series 61
Low Water Cut-off, Float Type
Series 63
Low Water Cut-off, Float Type
Series 750/751P/752P
Electronic Low Water Cut-off Controller, Probe Type
Series 64
Low Water Cut-off, Float Type
Low Water Cut-off with Integral Blowdown, Float Type, Side Tapping
Series 67
Low Water Cut-off with Quick Hook-up Fittings, Float Type