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

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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
Mercury switches for high temperature service.
Maximum pressure 150 psi.

Replacement Heads
Model Number Part Number Description Weight lbs. Price
150S-HD 173003 Head Mechanism - Replaces 150-HD and 150E-HD 10.5 $498.76
150S-M-HD 173203 150S-M-HD w/ manual reset - Replaces 150-M-HD 12 $498.76
150-E-HD 171640 Obsolete - Replace with 150S-HD 12 $498.76
150-E-M-HD 171650 Obsolete - Replace with 150S-M-HD if over 50 psi or 150S-M-MD-HD if less than 50 psi 12 ---

Ordering Information

Model Number Part Number Description Weight lbs. Price
157S 173502 157 Low water cut-off w/ water column 39.7 $714.21
157-MD 173600 157 w/ maximum differential 39.7 $997.50
157-A 173700 157 w/ alternate tapping 39.5 $Call
157-A-M 173800 Obsolete - Replace with 157S-AM 39.5 ---
157-M 175400 157-M 157 LWCO W/Manual Reset 39.7 $997.50
157-M-MD 175410 157-M w/ maximum differential 39.7 $Call
157-R 176200 157 w/ alternate tapping 42 $1,117.20
157-R-M 177300 157-R w/ manual reset 42 $1,117.20
157-RBP-MD 176501 Obsolete - Replace with 157S-RBP-MD 51 $Call
157-RL 176900 Obsolete - Replace with 157S-RL control w/alternate tapping 42 ---
157E-RL-M 171636 157-RL w/ manual reset 42 $853.86

Replacement Parts (View parts cut-sheet) Mercury Switches No Longer Available

Model Number Part Number Description Weight lbs. Price
SA150-125 348300 Mercury Switch, 2 wire (Repalce the Head that has the Snap Type Switch) 0.3 ---
SA150-124 348100 Mercury Switch, 3 wire (Repalce the Head that has the Snap Type Switch) 0.14 ---
SA150M-124 348200 Switch, 3 wire w/ Manual reset - Obsolete - Replace with 150S-M-HD 0.3 ---
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 $32.80
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 ---
SA150M-436 348900 Cover for mercury switch, manual reset only 0.5 $74.22
SA150-436 326950 Cover for all other models 0.5 $47.09


 

Electrical Ratings
Voltage Cut-off and Pump Circuit 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
157-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
157-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
157-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

McDonnell Miller Series 157 Drawings



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