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McDonnell & Miller PS-800
McDonnell & Miller 153875 PS-801-120
120v Probe Type Low Water Cut-off for Steam Boiler

Product has been discontinued.
Please call us for a suitable alternate product.

Mon - Fri 8:30am - 5:00pm Central

The Series 800 controls provide continuous protection against low water conditions for residential, commercial and industrial applications. Increased probe sensitivity prevents nuisance shutdowns, and a new test feature diagnoses shorted probe problems at installation. The improved userfriendly diagnostic LEDs simplify installation and troubleshooting, ensuring proper operation and saving time.

Standard Features:

  • For residential and commercial applications
  • 15 second delay on make; 10 second delay on break
  • Green LED multi-function test light
  • Red LED low water indicator light
  • Shorted probe indication
  • No blow-down required when mounted directly to boiler trappings
  • Meets ANSI specification Z21.13a
  • No lockout with loss of power if probe is in water

Maximum Temp Rating
250 °F 

Max Steam Pressure
15 PSI 

Max Water Pressure
160 PSI 

24 Volts 
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(800) 865-5931
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1901 N. Clybourn Avenue
Suite 200
Chicago, IL 60614
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(425) 928-2455
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