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Manual Override: The manual lever allows technicians to manually open the valve for system filling
making it suitable for outdoor and wash-down environments
this HVAC safety switch is calibrated to provide high-limit protection by breaking the electrical circuit to the gas valve or ignition control if internal temperatures exceed factory safety thresholds
Industrial-Grade Construction: Built to withstand high-temperature environments and thousands of cycles without diaphragm fatigue
McDonnell & Miller 61-HD Low Water Cut Off R-410A Manual Override: The manual leverThe McDonnell & Miller 61 HD (Part Number 140300) is a heavy duty mechanical low water cut off designed specifically for low pressure steam boiler applications. This head mechanism serves as a direct replacement component for Series 61 controllers, facilitating reliable burner circuit interruption when water levels drop below the safe line. Rated for a maximum steam pressure of 20 PSI, the 61 HD utilizes a high buoyancy float operated mechanism to
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