McDonnell & Miller 153900 Model 69 Mechanical Low Water Cut Off
McDonnell & Miller 153900 Model 69 Mechanical Low Water Cut Off
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Apply for Trade Account & Terms →| Performance Parameter | Engineering Baseline Value |
|---|---|
| Manufacturer Part Number (MPN) | 153900 |
| Model Designation | 69 |
Maintain optimal boiler safety and prevent damage caused by low water conditions with the McDonnell & Miller 153900, also known as the Model 69 mechanical low water cut off. This device provides essential protection for hot water boiler systems, effectively monitoring water levels to ensure the burner shuts down before critical overheating occurs.
The unit utilizes a proven float-actuated mechanism that responds immediately to dropping water levels. When water levels fall below the established threshold, the mechanical switch triggers, safely interrupting the burner circuit to prevent dry firing and potential system failure.
Key System Performance Baselines:
- Safety Reliability: Mechanical switch design provides dependable operation without complex electronic requirements.
- Robust Construction: Engineered to withstand the thermal demands of residential and light commercial hydronic systems.
- Easy Maintenance: Designed for straightforward installation and long-term durability in heating applications.
⚠️ Application Profile: Ideal for steam or hot water heating boilers in residential and light commercial environments requiring reliable, non-electric safety intervention.
