Description:  The Series PSE-800-M Manual Reset LWCO is a new addition to the McDonnell & Miller probe type low water cut-off group of products. These controls are used as the secondary LWCO on steam boilers and can be used as the primary LWCO on hot water heating boilers.

With a self-cleaning probe, available only on McDonnell & Miller probe type controls, which reduces probe maintenance to once every five years instead of annually. Manual reset models meet requirments of ASME Standard CSD-1.

Features and Benefits

• For residential and commercial applications
• Electronic Operation

NEW Features and Benefits:

• User-friendly diagnostics
  • Red low water and shortened probe LED
  • Green power and test LED
• Probe sensitivity: 7,000 ohms
• No lock out with loss of power if probe is in water
• Delay on make (DOM) feature (15 seconds)
• Delay on break (DOB) feature (10 seconds)
• No blow down of control required when mounted directly into boiler tappings
• Test button standard on all models
• Options available include
  • Manual reset
  • Extended barrel and remote sensor models
  • 120 volt and 24 volt models (24 volt models meet ANSI specification Z21.13a
• Power consumption 1.7 VA
• Provisions to add alarm or automatic water feeder
• Maximum ambient temperature 120°F (49°C)
• Maximum steam pressure 15psi (1kg/cm²)
• Maximum water temperature 250°F (121°C)