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The McDonnell & Miller 51-HD Mechanism (Part Number 134900) is a heavy-duty mechanical water feeder designed for low pressure steam and hot water boilers
This 250F M/R safety rollout switch acts as a primary line of defense
The hardware features a rugged 1/4 inch x 9 3/8 inch rigid sensing element constructed with a liquid-filled copper bulb and a beryllium copper feedback bellows to ensure linear response and minimize hysteresis
This unit comes equipped with a 60-inch capillary
Nordyne 632675 Pressure Switch 321702-401 The McDonnell & Miller 51-HDThe Nordyne 632675 Pressure Switch is a critical safety component designed for high efficiency HVAC operations, specifically calibrated to a 1. 09" WC (water column) set point. As a veteran grade OEM furnace pressure switch, this part is engineered to monitor the pressure differential created by the inducer motor, ensuring the exhaust vent system is clear of obstructions before allowing the ignition sequence to proceed. This spst nc pressure switch
