A5/A3â„¢ Service Manual 046-001141-00 3 - 37
Periodic Maintenance Performance Verification
3.11.4 Alarm Silence Test
1. While the APNEA alarm is sounding, press the Silence soft key.
2. Verify the audio portion of the alarm stops and resumes after 2 minutes or when an additional
alarm message appears.
3.11.5 VCV Adult Ventilation Mode Test
1. Set the O2 flow to 2 L/min and set the N2O and AIR flow rates to minimum flow.
2. Set the mechanical Auto/Manual switch to AUTO.
3. Connect a Vent Tester to the breathing system. Unidirectional Vent Testers need to be
connected to the expiratory limb
4. Set the ventilator controls to the following:
5. If necessary, press Set Mode button to begin ventilation.
6. Verify that the pressure waveform, Tidal Volume, Mean or Plateau Pressure, Resp. rate and minute
volume values appear on the screen.
7. Verify the Tidal Volume display on the Vent Tester is within 7% (±42 mL) of the set value within
approximately 1 minute from the start of ventilation.
8. Verify the Tidal Volume display is within 9% (±54 mL) of the set value within approximately 1
minute from the start of ventilation.
9. Verify the measured O2 concentration is at least 97% after 5 minutes.
10. Set the AIR flow to 3 L/min and set the N2O and O2 flow rates to minimum flow.
11. Verify the measured O2 concentration is 21% ±3% vol. % after 5 minutes.
Ventilator Controls Ventilator Settings
Ventilation Mode VCV
Vt 600
Rate 8
I:E 1:2
Tpause 10
PEEP Off
Plimit 50
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