McDonnell Miller Series 157S Low Water Cut-off
McDonnell Miller 157S

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For residential, commercial, and industrial applications. For boilers of any steam capacity. 
Monel bellows provides corrosion resistance.
Float chamber with integral water column provided
Snap action switches for high temperature service.
Maximum pressure 150 psi.

Replacement Heads
Model Number Part Number Description Weight lbs. Price
150S-HD 173003 Head Mechanism w/ snap switch 11 $498.76
150S-M-HD 173203 150S-HD w/ manual reset 11 $498.76
150S-MD-HD 173103 150s Maximum Differential 11 $498.76
150S-M-MD-HD 173302 150S w/ manual reset & Max diff. 11 $Call

Ordering Information

Model Number Part Number Description Weight lbs. Price
157S 173502 150 Low water cut-off w/ water column 39.7 $714.21
157S-MD 173603 157 w/ maximum differential 39.7 $714.21
157S-A 173702 157 w/ alternate tapping 39.5 $Call
157S-A-M 173802 157-A w/ manual reset 39.5 $714.21
157S-M 175402 157 w/ manual reset 39.7 $714.21
157S-M-MD 175412 157-M w/ maximum differential 39.7 $Call
157S-R 176220 157 w/ alternate tapping 42 $813.96
157S-R-M 177306 157-R w/ manual reset 42 $809.97
157S-RBP-MD 176503 157 w/ 2 integral conductance probes 51 $1,328.68
157S-RL 176902 157 w/ alternate tapping 42 $809.97
157S-RL-M 177006 157-RL w/ manual reset 42 $809.97

Replacement Parts (View parts cut sheet)

Model Number Part Number Description Weight lbs. Price
SA150-106R 347900 Bellows Assembly 0.4 $143.64
SA150-11 347600 Float and Rod 1 $151.63
150-14H 325500 Head gasket (for raised face head flange, 8 holes), 6 pack 0.5 $32.82
EA-157-S 354106 Short electrode for 157-RBP 0.5 $127.68
EA-157-L 354107 Long electrode for 157-RBP 0.5 $127.68
PCH-G-A-2 179150 Probe level control (OBSOLETE - NO REPLACEMENT ) 2.7 ---
SA150-436 326950 Cover 0.5 $47.09

 

Electrical Ratings
Voltage Cut-off and Pump Curcuit Rating  Pilot duty
Full Load Locked Rotor
120 VAC 7.4 44.4 125 VA at 120 or 240 VAC
240 VAC 3.7 22.2
Alarm Circuit Rating
Voltage Amps
120 VAC 1
240 VAC 1/2
Dimensions
Model A B C D E F G H J K L
157 1 1/2 13 3/8 2 5/16 4 15/16 11 3/4 16 11 1/2 3 1/2 3/4 5 7/8
157S-A 1 1/4 3/4 13 3/8 2 5/16 4 15/16 11 3/4 16 11 1/2 3 1/2 3/4 5 7/8
157S-R 1 1/2 13 3/8 2 1/4 5 7/8 11 3/4 17 11 1/2 3 1/2 3/4 6 1/4
157S-RL 1 1/4 1/2 13 9/16 3 1/2 5 7/8 11 3/4 17 12 3/4 3 1/2 3/4 6 1/4
157S-RBP-MD 1 1/2 13 9/16 2 1/4 5 7/8 11 3/4 17 11 1/2 3 1/2 NA 12 1/4

McDonnell Miller Series 157S Drawings



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