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The McDonnell & Miller 7-B Switch (Part Number 110800) is a critical component for specialized boiler control systems requiring potentiometer proportional control
Most failures are secondary to a downstream short circuit
it maintains a critical fixed spark gap of 1/8 inch to ensure reliable arc-over even in fluctuating residential or industrial environments
It is the direct factory-authorized replacement for several legacy part numbers
ASCO valve troubleshooting often reveals worn diaphragm assemblies or fatigued compression springs
Watts F156732 Relief Valve 340155-7024 The McDonnell & Miller 7-BThe Watts F156732 pressure relief valve is built for dependable overpressure protection in hydronic and HVAC systems where controlled discharge is critical. This 3 4" relief valve features a 30 PSI pressure rating and a 5 inch configuration designed for consistent response under fluctuating system loads. Commonly applied in boilers, water heaters, and closed loop heating systems, this boiler relief valve helps prevent excessive pressure buildup that