McDonnell & Miller 61-HD Low Water Cut Off R-410A this HVAC safety switch is

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

This actuator is specifically designed for use with ESBE VRG and VRB series rotary valves

Manual Override: The manual lever allows technicians to manually open the valve for system filling

and Armstrong R41093-001

making it suitable for outdoor and wash-down environments

McDonnell & Miller 61-HD Low Water Cut Off R-410A this HVAC safety switch isThe 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