Description
McDonnell & Miller 175402 157S-M Combo Low Water Cut-Off & Pump Controller (Steam) — Discontinued
Note: This model (175402) was discontinued on December 6, 2015. It has been replaced by the same part number 157S-M with no modifications — a direct, drop-in replacement.
Product Overview
Designed for residential, commercial, and industrial steam boilers, the McDonnell & Miller 175402 157S-M provides dependable float-type combined low water cut-off and pump control with manual reset. Its rugged construction features corrosion-resistant Monel bellows and an integral water column for easy installation and reliable operation.
Key Features:
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Manual reset for added safety and control
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Snap action switches for high-temperature steam service
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Single pole, single throw (SPST) switch for pump control
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Single pole, double throw (SPDT) switch for low water cut-off and alarm
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Threaded 1" NPT connections
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Rated for up to 150 psi steam pressure
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Operates at 120 volts AC
Technical Specifications
| Feature | Specification |
|---|---|
| Max Pressure | 150 psi (10.5 kg/cm²) |
| Application | Steam Boilers |
| Switch Types | SPST (Pump Control), SPDT (LWCO & Alarm) |
| Reset Type | Manual |
| Voltage | 120 V AC |
| Connection Type | Threaded 1" NPT |
| Pilot Duty Rating | 345 VA |
| Dimensions (L×W×D) | 16" × 5.88" × 13.38" |
| Features | Water Column, Snap Action Switches |
Upgrade your boiler safety with this trusted McDonnell & Miller combo controller. For the latest model, search for part number 157S-M.
