Description
McDonnell & Miller 143800 64B – Float Block Low Water Cut-Off for Steam & Hot Water Boilers
Heavy-Duty Water Level Control for Residential, Commercial & Industrial Boilers
The McDonnell & Miller 64B Low Water Cut-Off is a robust float-style control designed for dependable water level management in steam and hot water boilers of all capacities. Featuring dual precision switches, packless bellows, and an adjustable BX outlet, this unit offers reliable operation and easy installation. Optional manual reset is available for added control flexibility.
Key Benefits:
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Suitable for residential, commercial, and industrial boiler applications
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Heavy-duty design built to last under demanding conditions
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Dual precision switches for reliable cutoff and alarm or electric water feeder control
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Packless bellows for long service life and leak prevention
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Adjustable BX outlet simplifies installation and fitment
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Requires 1" NPT equalizing pipes for optimal performance
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Compatible with TC-4 blow down valve for hot water systems
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Supports boiler pressure up to 50 PSI
Specifications
| Attribute | Details |
|---|---|
| Part Number | 143800 64B |
| Application | Steam Boilers, Hot Water Boilers |
| Type | Float-Style Low Water Cut-Off |
| Max Pressure (PSI) | 50 PSI (3.5 kg/cm²) |
| Reset Type | Automatic (Optional Manual) |
| Connection Type | Threaded |
| Thread Size | 1" NPT |
| Switch | Dual Precision Switches |
| Electrical Ratings (AFL) | 3.7 A @ 240 VAC, 7.4 A @ 120 VAC |
| Electrical Ratings (ALR) | 44.4 A @ 120 VAC, 22.2 A @ 240 VAC |
| Pilot Duty Rating | 125 VA |
