McDonnell & Miller 47 Mechanical Water Feeder For Steam & Hot Water 132700 for Sale

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McDonnell & Miller 47 Mechanical Water Feeder For Steam & Hot Water 132700 For Sale

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McDonnell & Miller 47 Mechanical Water Feeder For Steam & Hot Water 132700:
$748.00

This is an older original McDonnell & Miller / ITT Fluid Technology Corporation unit supplied with its original box and installation/service documentation.

PRODUCT IDENTIFICATION

Brand: McDonnell & Miller
Manufacturer: ITT Fluid Technology Corporation
Model: 47-2
Series: 47 Series
Product Type: Mechanical Boiler Water Feeder / Low Water Cutoff
Control Type: Float-operated mechanical feeder
Low Water Cutoff: Yes
Reset Type: Automatic
Maximum Boiler Pressure: 25 PSI
Application: Steam and hot water boilers
Original Box Marking: Water Feeder No. 47-2

FUNCTION

The Model 47-2 combines two boiler-control functions:

Mechanical automatic water feeder
Automatic low-water cutoff

According to the original instructions, the feeder maintains the required minimum boiler water level during normal operation.

If the boiler water level falls below the low-water cutoff level, the control switch is designed to interrupt the burner circuit. As the water level is restored to the normal operating level, the control returns to normal operation.

MODEL DIFFERENCE

Model 47-2: Mechanical water feeder control with automatic low-water cutoff.

Model 47-2M: Mechanical water feeder control with manual-reset low-water cutoff.

This listing is for the Model 47-2 automatic-reset version shown in the photos.

TECHNICAL SPECIFICATIONS

Maximum Boiler Operating Pressure: 25 PSI

Maximum Operating Temperature: 268°F

Maximum Water Supply Pressure to Feeder: 150 PSI

Equalizing Pipe Size: 1 in minimum per original installation instructions

The original documentation provides installations for both steam boilers and hot-water boilers.

ELECTRICAL SWITCH RATINGS

Original McDonnell & Miller documentation lists the following ratings for controls equipped with the No. 2 switch:

DC Rating:
120 VDC: 5 A

Motor Duty:

120 VAC:
Full Load: 10.2 A
Locked Rotor: 61.2 A

240 VAC:
Full Load: 5.1 A
Locked Rotor: 30.6 A

Pilot Duty:
120-240 VAC, 60 Hz
125 VA

The No. 2 switch is identified in the original literature as an automatic low-water cutoff control.

BOILER APPLICATIONS

Suitable for applications including:

Steam boilers
Hot-water heating boilers
Process boilers
Commercial boiler systems
Mechanical rooms
Hydronic heating systems
Replacement of existing McDonnell & Miller 47 Series controls

The original instructions show multiple installation configurations including boilers with gauge glass, independent water columns, and hot-water boiler piping arrangements.

WATER FEEDER OPERATION

The float mechanism responds to boiler water level.

During a drop in water level:

The float drops.

The feeder valve opens to admit make-up water.

If the water level continues to fall to the cutoff point, the low-water cutoff switch interrupts the burner circuit.

When the correct water level is restored, the feeder valve closes and the automatic cutoff control returns to normal operating condition.

SERVICE / MAINTENANCE

The original manufacturer instructions emphasize regular blow-down and flushing of the float chamber.

McDonnell & Miller recommends flushing the boiler water level control regularly during the heating season to prevent sediment accumulation inside the float chamber.

The unit includes a blow-off valve for servicing and flushing.

ORIGINAL DOCUMENTATION INCLUDED

Original McDonnell & Miller installation instructions are included and cover:

47 Series
247 Series
51 Series
51-S Series
53 Series

Documentation includes:

Mechanical installation
Steam boiler installation
Hot-water boiler installation
Water feeder piping
Electrical wiring
Low-water cutoff operation
Feeder testing procedures
Broken-union test procedure
Troubleshooting
Maintenance and flushing instructions

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