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The cut-out pressure should be in accordance with the pressure setting of the piece number being used. (Common cut-out pressures are between 105-125 psi.) With the engine still running, make a series of brake applications to reduce the air pressure and observe at what pressure the governor cuts-in the compressor.
Varying the air pressure controls the air temperature since the warmed air from the engine bleed moves through the cabin towards the exit valves. Want it warmer, lower the pressure and warmer air fills the cabin. Keep the valves closed for a while and the aircraft cools pretty rapidly and the air does too. Doesn't take much change in pressure to move the air, a few feet of altitude will do it, but the change is what is needed to make the air move at all.