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10. Switch off the O2 supply and keep the reading on the test pressure gauge remain
non-decreased. If the "O2 Supply Failure" alarm is generated in 10s, the pressure switch
of the O2 inlet assembly is damaged. Handle this issue according to the fault locating
table.
11. Adjust the O2 flow regulator until the O2 flow reaches 0.5 L/min, to gradually decrease
the reading on the test pressure gauge to 0.2 MPa (2 bar).
12. Switch off the O2 supply and keep the reading on the test pressure gauge remain
non-decreased. If the "O2 Supply Failure" alarm is generated in 10s, the pressure switch
of the integrated airway of the exhalation valve assembly is damaged. Handle this issue
according to the fault locating table.
13. Adjust the O2 flow regulator until the O2 flow reaches 0.3 L/min, to gradually decrease
the reading on the test pressure gauge to 0.15 MPa (1.5 bar).
14. Switch off the O2 supply and keep the reading on the test pressure gauge remain
non-decreased. If the "O2 Supply Failure" alarm is not generated in 10s, the pressure
switch of the O2 inlet assembly is damaged. Handle this issue according to the fault
locating table.
15. Adjust the O2 flow regulator until the O2 flow reaches 0.3 L/min, to gradually decrease
the reading on the test pressure gauge to 0.05 MPa (0.5 bar).
16. Switch off the O2 supply and keep the reading on the test pressure gauge remain
non-decreased. If the "O2 Supply Failure" alarm is not generated in 10s, the pressure
switch of the integrated airway of the exhalation valve assembly is damaged. Handle
this issue according to the fault locating table.
8.4.2.3 Adjusting the Pressure Switch
Adjust the O2 pressure switch and drive gas pressure switch.
Adjust the O2 pressure switch using a slot-head screwdriver. Screw a little bit each time, for
example, 30 degree. Note that the alarm limit is decreased when you rotate the pressure switch
clockwise and the alarm limit is increased when you rotate the pressure switch anticlockwise. Test
the component each time you adjust the pressure. Repeat the operations until the pressure switch is
correctly adjusted and the pressure is remained within the specified range (nominal value 220 kPa
+/- 10 kPa).
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