Replacement Parts List

ManualsBrandsMcdonnell & Miller ManualsHeating Supplies157S-A, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings (Steam)

Boiler Control Replacement Parts

McDonnell & Miller

OILER

ONTROLS

Series 150, 150S & 150E

Series 157, 157S & 157E (continued)

Note:

Manual reset models with date code 03K (October 2003)

or older require the purchase of a new head.

IMPORTANT:

• Snap switches must be replaced as an assembly.

• We recommend complete head replacement to

eliminate the need for field adjustment of the

switch assembly.

• Series 150S and 157S replacement switch

assemblies are not interchangeable with Series 150

and 157 mercury switch controls.

Low Water Cut-Off/Pump Controllers

For Steam Boilers

For Repl. Switch Part Weight

Model Model No. Number Description lbs. (kg)

SWA-150S 310462 Snap-action 0.5 (.23)

switch assembly

SWA-150S-MD 310464 Snap-action 0.5 (.23)

switch assembly

for maximum

differential models

SWA-158S 310468 Snap-action 0.5 (.23)

switch assembly

for Model 158S

SWA-159S 310470 Snap-action 0.5 (.23)

switch assembly

Switch assemblies include a mounting bracket and color-coded terminal connection wires.

Replacement Switch Assemblies for Series150S and 157S

All

150S & 157S

Units

Except

‘MD’ Models

All

150S & 157S

‘MD’ Models

All

158S

Models

All

159S

Models

Model SWA-150S

Model SWA-150S-MD

Model SWA-158S

Model SWA-159S