McDonnell & Miller 67-G 149600 Low Water Cut-Off

Description

The McDonnell & Miller 67-G 149600 Low Water Cut-Off is a specific model within the popular 67 series, designed for steam or hot water boilers with millivolt service. Here’s a breakdown of its key features:

Function:

• Automatic safety device: Shuts down the boiler burner if the water level falls below a safe threshold, preventing damage 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 mercury switches: One for low water cut-off (boiler shutdown) and the other for alarm or feeder control (optional).
• Millivolt service: Compatible with low-voltage systems typically found in smaller boilers.

Features:

• Quick hook-up fittings: Simplify installation for gauge glass tappings (1/2″ NPT).
• Lever-operated blow down valve: Easy to drain sediment and maintain the boiler.
• Adjustable BX outlet: Adapts to various installation configurations.
• Large float chamber: Ensures accurate water level sensing.
• Maximum steam pressure: 20 psi.

Benefits:

• Enhanced safety: Protects your boiler from low water hazards.
• Reliable operation: Proven design and durable construction.
• Ease of installation and maintenance: Quick connect fittings and accessible blow down valve.
• Versatility: Suitable for steam and hot water boilers with millivolt service.

Things to consider:

• Compatibility: Ensure the 67-G 149600 matches your boiler type, pressure rating, and electrical requirements.
• Installation: Proper installation by a qualified technician is crucial for safety and optimal performance.
• Maintenance: Regular inspection and testing are recommended to ensure the Low Water Cut-Off is functioning correctly.

Overall, the McDonnell & Miller 67-G 149600 Low Water Cut-Off is a reliable and effective safety device for millivolt steam and hot water boilers. Its combination of features, ease of use, and robust construction makes it a popular choice for protecting your boiler and ensuring safe operation.