4-5
4.3.3 Troubleshooting—Leak Test
The following table lists the commonly-encountered problems and recommends actions for
breathing system leak test in mechanical ventilation mode.
Fault Description Possible Cause Recommended Action
Leak test failure is
prompted immediately
after [Start] is selected
(typically, the leak test
requires at least 3
minutes).
The Auto/Manual switch is set to the
Manual position and the message [Manual
Vent.] is prompted.
Set the Auto/Manual switch
to the Auto position.
The reading on the drive gas (O2) pressure
gauge indicates drive gas pressure low
(lower than 200 kPa) and the alarm of
[Drive Gas Pressure Low] is produced.
Replace or connect gas
supplies and make sure that
the drive gas pressure is at
280 to 600 kPa.
During leak test, the
pressure indicated by
the airway pressure
gauge fails to reach 30
cmH2O.
1. Before the leak test, the bellows is not
fully inflated.
2. The Y piece on the breathing tube is not
connected to the test plug.
3. The bellows housing is not properly
installed.
4. The sample gas return quick connector is
not blocked.
1. Allow the bellows to be
fully inflated before leak
test.
2. Connect the Y piece on the
breathing tube to the test
plug.
3. Re-install the bellows
housing.
4. Block the sample gas
return quick connector
4.4 Gas Supply Tests
All the three needle valves must be closed before the following tests.
4.4.1 O2 Pipeline Supply Test
NOTE
Remove the O2 cylinder from the yoke before performing this test.
1. Connect the machine to the O2 supply connector on the wall via O2 supply hose.
2. Check that the O2 supply pressure gauge reads 280 to 600 kPa.
3. Turn on the system switch.
4. Fully open the O2 needle valve.
5. Observe the float of total flowmeter, which should be at the top of the flowmeter.
6. Disconnect the O2 pipeline supply.
7. Make sure that the alarms of "O2 Supply Failure" and "Drive Gas Pressure Low" occur
with the decrease of O2 pressure.
8. Check that the O2 supply pressure gauge decreases to zero.
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