McDonnell & Miller 69 Low Water Cut-Off 153900

Description

The McDonnell & Miller 69 Low Water Cut-Off 153900, also known as model number 69 or MH1070 in some references, is a popular choice for protecting steam boilers from the dangers of low water conditions. Here’s a breakdown of its key features and benefits:

Function:

• Automatically shuts down the boiler burner if the water level falls below a safe threshold, preventing overheating and potential explosions.

Operating Principle:

• Float-activated: A float inside the boiler rises and falls with the water level, triggering a switch when it drops too low.
• Dual 120-volt switches: One for low water cut-off (boiler shutdown) and the other for alarm or electric water feeders (optional).
• Maximum pressure of 20 psi: Suitable for residential and commercial low-pressure steam boiler applications.

Features:

• For boilers of any steaming capacity: Offers versatility for various boiler sizes.
• 4-1/8″ insertion length: Fits comfortably into 2-1/2″ NPT boiler side tappings.
• Packless bellows: Eliminate potential leak points for increased safety and reliability.
• Adjustable BX outlet: Adapts to different installation configurations.
• Dual precision switches: Ensure reliable operation of both the low water cut-off and optional alarm or feeder functions.

Benefits:

• Enhanced safety: Protects your boiler from the dangers of low water and potential explosions.
• Reliable performance: Proven design and robust construction ensure years of dependable service.
• Versatility: Compatible with various boiler types and capacities.
• Additional control options: Dual switches allow for alarm or feeder activation on low water conditions.
• Ease of installation: Adjustable outlet and packless bellows simplify setup.

Things to consider:

• Compatibility: Choose the model with the appropriate pressure rating for your boiler.
• Installation: Proper installation by a qualified boiler technician is crucial for safety and optimal function.
• Maintenance: Regular inspection and testing are necessary to ensure the LWCO is working correctly.

Overall, the McDonnell & Miller 69 Low Water Cut-Off 153900 is a valuable safety device for your steam boiler. Its reliable performance, versatility, and ease of use make it a popular choice for protecting your boiler and ensuring safe operation.