Replacement Parts List

Boiler Control Replacement Parts

McDonnell & Miller

OILER

ONTROLS

Series 51-S/51-S-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-S-2-HD 136200 Head mechanism w/ No. 2 switch 20.5 (9.3)

51-S or

51-S-2M-HD 136250 51-S-2-HD w/manual reset 21.7 (9.8)

Components (shown on page 45)

Item Part Model Weight

Number Number Number Description lbs. (kg)

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 1.0. (0.7)

(includes item 4)

(see note following page)

8 342100 SA51S-6 Valve assembly 3.0 (1.4)

9 316200 51S-114 Valve seat 0.8 (.36)

10 342200 SA51-9 Strainer assembly 0.1 (.05)

11 312900 37-28 Gasket 0.1 (.05)

12 324435 37-101 Tetraseal O-ring 0.1 (.05)

13 340700 SA37-38 Strainer basket 0.7 (.32)

(includes item 12)

Series 51-S-2

Series 51-S

Model 51-S-2-HD

Model 51-S-2M-HD

PAGE 1
BOILER CONTROLS Boiler Control Replacement Parts McDonnell & Miller Combination Mechanical Water Feeder/ Low Water Cut-Offs Series 51-S/51-S-2 Water Feeder/Low Water Cut-Offs Replacement Head Mechanisms For Series Repl. Head Model No. Part Number Description Weight lbs. (kg) 51-S-2-HD or 51-S-2M-HD 136200 Head mechanism w/ No. 2 switch 20.5 (9.3) 51-S 136250 51-S-2-HD w/manual reset 21.7 (9.
PAGE 2
Boiler Control Replacement Parts McDonnell & Miller BOILER CONTROLS Combination Mechanical Water Feeder/ Low Water Cut-Offs Series 51-S/51-S-2 (continued) Water Feeder/Low Water Cut-Offs Components 1 2 4 6 5 7 3 8 9 11 10 12 13 Note: One time float and bellows replacement is required when replacing bellows or float assemblies with date codes before February, 2005 (05B).