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This differential air pressure switch is factory-calibrated to a -1
a humming/buzzing sound from the coil
you will require a different part number or a hub adapter
For technicians performing this gas furnace conversion
Johnson Controls P170DA-1 Pressure Control 30067439-890 This differential air pressure switchThe Johnson Controls P170DA 1 is a heavy duty high pressure cutout control designed for rugged performance in commercial refrigeration and air conditioning systems. This SPST open high pressure switch features a manual reset lockout mechanism, ensuring that once the system crosses the user defined safety threshold, it remains offline until a technician performs a manual inspection. This "trip free" lockout design is essential for protecting
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