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2. Set the bag/mechanical ventilation switch to the bag position.
3. Set the APL valve reading to Min.
4. Push the O2 flush button.
5. The reading on the airway pressure gauge should fall with the range of 0 to 10 cmH2O.
6. Set the APL valve reading to 30 cmH2O.
7 Push the O2 flush button.
8. The reading on the airway pressure gauge should fall with the range of 25 to 35 cmH2O.
9. Set the APL valve reading to 50 cmH2O.
10. Push the O2 flush button.
11. The reading on the airway pressure gauge should fall with the range of 45 to 55 cmH2O.
12. If the reading on the airway pressure gauge fails to fall within the required range during
steps 3 through 11, adjust the APL valve until the measurement requirements are met.
Valve cover
Locking ring
Dig out the valve cover from here
using a flathead screwdriver.
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