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The controller is pre-programmed with a -25 C (-13 F) set point which provides a compressor cut-in at -23 C (-9 F) and cut-out at -25 C (-13 F). The controller set point can be raised to -15 C (+5 F) for nourishment applications where a lower temperature is not desired (i.e. ice cream). Follow instructions for changing temperature °C - 25 evaporator fan energized defrost refrigeration system energized cut-out below. All set points have a 2 C differential. The 2 C differential means that with a -