Armstrong Furnace R40787 001 Outdoor Stat Kit Els PW 17895 providing reliable ignition in residential providing reliable ignition in residential and light commercial equipment including rooftop units and infrared heaters cross reference your furnace’s data plate model number with the B2832601 part number it is commonly utilized in dual fuel (hybrid) applications to lockout the furnace until the outdoor temperature drops below the heat pump's effective operating range The sensor should be mounted in a location on the outdoor condenser unit that is shielded from direct sunlight and discharge air to ensure accurate ambient temperature readings