It will trip when the temperature reaches the upper limit and close back up once the heater has cooled sufficiently

Broad Compatibility: Replaces obsolete part number 101231-02 across multiple Lennox and Allied Air brands

although it can function in other orientations depending on system pressure

Measure the diameter of your existing flue pipe

Ranco O22-7706 Pressure Control Els PW 17895 It will trip when theThe Ranco O22 7706 Dual Pressure Control is a versatile refrigeration component designed to consolidate high pressure limit and low pressure control functions into a single DPST (Double Pole Single Throw) unit. This O Series control features a low pressure range of 10" Hg to 100 PSI and a high side cutout range of 150 to 450 PSI. Built with a heavy duty plated steel frame and a NEMA 1 enclosure, this unit is engineered for commercial refrigeration