For CM models, the pressure knob is located on the left in place of the timing knobs pictured here.

Procedure can be found in the attached document.

Block the connector on the front of the machine using a rubber plug or similar item.

Check the pressure gauge. If it is not zero, see “pressure gauge reading is wrong” on the troubleshooting guide.

Set the inhale pressure knob fully clockwise, and the inhale flow and pressure knobs fully counterclockwise. On the CA models, set the manual/auto switch to manual, and set each timing knob to 1 second.