Replacement Parts List

Boiler Control Replacement Parts

McDonnell & Miller

OILER

ONTROLS

Series 551-S

Make-Up Water Feeders

Water Feeders – Make-Up

Components

Item Part Model Weight

Number Number Number Description lbs. (kg)

1 310437 FLT-51-05 Float (includes item 2) 2.5 (1.1)

(see note below)

2 304100 F-26 Gasket 0.1 (.05)

3 310442 BA-551-05 Bellows bracket assembly 1.5 (0.7)

(see note below)

4 312800 37-27 Gasket 0.1 (.05)

5* 352600 SA551S-101-102 Valve & strainer kit 4.0 (1.8)

6 324435 37-101 Tetraseal o-ring 0.1 (.05)

7 347100 SA101-38 Strainer basket 0.7 (.32)

(includes item 6)

8 310452 CTRD-51 Cartridge kit 0.8 (.36)

Series 551-S

Series 551-S-HD

Replacement Head Mechanisms

For Repl. Head Part Weight

Series Model No. Number Description lbs. (kg)

551-S 551S-HD 136600 Head mechanism 25.7 (11.7)

NOTE:

One time float and bellows

replacement is required

when replacing bellows or

float assemblies with date

codes before February 2005

(05B).

Round Boss

Pilot Action Style

Pre August 1995

Hex Boss

Cartridge Style

After August 1995

* Units manufactured prior to August 1995 have a round

port pilot valve and a strainer assembly. These valve

and strainer assemblies can be replaced with the

current hex port cartridge valve and strainer assembly.