Replacement Parts List

Boiler Control Replacement Parts

McDonnell & Miller

OILER

ONTROLS

Series 51/51-2

Water Feeder/Low Water Cut-Offs

Combination Mechanical Water Feeder/

Low Water Cut-Offs

Replacement Head Mechanisms

For Repl. Head Part Weight

Series Model No. Number Description lbs. (kg)

51-2-HD 135100 Head mechanism w/ No. 2 switch 18.3 (8.3)

51-2 or

51-2M-HD 135300 51-2-HD w/manual reset 26.0 (11.8)

Components (shown on page 43)

Item Part Model

1 110000 2 Low water cut-off switch 1.0 (0.5)

2 110100 2-M No. 2 w/manual reset 1.0 (0.5)

3 310437 FLT-51-05 Float 2.5 (1.1)

(see note following page)

4 304100 F-26 Gasket 0.1 (.05)

5 312800 37-27 Gasket 0.1 (.05)

6 302900 CO-106 Cam assembly 0.1 (.05)

7 310439 BA-51-05 Bellows bracket assembly 1.5 (0.7)

(includes item 4)

(see note following page)

8* 342500 SA51-101-102 Valve & strainer kit 3.0 (1.4)

9 310452 CTRD-51 Cartridge & strainer kit 0.8 (.36)

10 324435 37-101 Tetraseal O-ring 0.1 (.05)

11 347100 SA101-38 Strainer basket 0.7 (.32)

(includes item 10)

Series 51-2

Series 51

Model 51-2-HD

PAGE 1
BOILER CONTROLS Boiler Control Replacement Parts McDonnell & Miller Combination Mechanical Water Feeder/ Low Water Cut-Offs Series 51/51-2 Water Feeder/Low Water Cut-Offs Series 51 Replacement Head Mechanisms For Series Repl. Head Model No. Part Number Description Weight lbs. (kg) 51-2-HD or 51-2M-HD 135100 Head mechanism w/ No. 2 switch 18.3 (8.3) 51-2 135300 51-2-HD w/manual reset 26.0 (11.
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Boiler Control Replacement Parts McDonnell & Miller BOILER CONTROLS Combination Mechanical Water Feeder/ Low Water Cut-Offs Series 51/51-2 (continued) Water Feeder/Low Water Cut-Offs Components 1 2 4 6 5 5 7 3 10 8 9 Round Boss Pilot Action Style Pre August 1995 Hex Boss Cartridge Style After August 1995 11 * Units manufactured prior to August 1995 have a round port pilot valve and a strainer assembly.