McDonnell & Miller 129502 42S-HD Head Mechanism
McDonnell & Miller 129502 42S-HD Head Mechanism
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Apply for Trade Account & Terms →| Performance Parameter | Engineering Baseline Value |
|---|---|
| Manufacturer Part Number (MPN) | 129502 |
| Model Designation | 42S-HD |
| Compatibility | 42S and 42S-A Series |
Ensure reliable boiler safety and precise water level control by replacing worn internal components with the McDonnell & Miller 129502 42S-HD Head Mechanism. Engineered specifically to restore the operational integrity of 42S and 42S-A series low water cut-offs, this head mechanism serves as a direct fit replacement to maintain your system's regulatory compliance and safety standards.
This head assembly houses the critical switching components that detect boiler water levels, converting mechanical float movement into precise electrical control signals. By installing this factory-authorized replacement, you resolve common fatigue issues associated with aging sensors, ensuring consistent burner cut-off performance and protection against dry firing.
Key System Performance Baselines:
- Precision Control: Engineered for reliable, repeatable water level sensing in hydronic applications.
- Durability: Constructed from industrial-grade materials to withstand the high-temperature, high-pressure demands of boiler rooms.
- Compatibility: Designed for seamless integration with 42S and 42S-A series McDonnell & Miller units.
- Operational Efficiency: Restores factory-specified response times for critical low-water safety shutdown.
⚠️ Application Profile: Recommended for use in commercial and residential steam boiler systems, low water cut-off maintenance, and preventative boiler safety upgrades.
