Breathing System Checks Periodic Maintenance
3 - 34 046-001141-00 A5/A3™ Service Manual
3.10 Breathing System Checks
3.10.1 Waste Gas Scavenger Test (if available)
1. Connect one end of the low pressure waste gas hose to the port on the Waste Gas Scavenger
Assembly. Connect the other end of the hose to the EVAC port.
NOTE: If operating the A5/A3 with other types of waste gas scavenging,
ensure that waste gases are directed from the EVAC port to that
scavenging system.
2. Connect the respiratory gas monitor exhaust output to the barbed fitting port on the Waste Gas
Scavenger Assembly.
3. Ensure that the waste gas scavenger flow adjustment is able to be set between the MIN and
MAX line markings.
3.10.2 Internal Gas Connections Test
1. Close and remove all gas cylinders from the A5/A3.
2. Connect only the AIR line pressure hose to the A5/A3 from the wall supply. Leave all other line
pressure hoses disconnected.
3. With the A5/A3 powered ON, rotate the AIR flow control knob to ensure a continuous flow
increase throughout its full range
4. Fully rotate the N2O flow control knob and verify that there is no flow.
5. Fully rotate the O2 flow control knob and verify that there is no flow.
6. Disconnect the AIR line pressure hose from the A5/A3, and connect the O2 line pressure hose
from the wall supply, rotate the O2 flow control knob to ensure a continuous flow increase
throughout its full range (0 to 15 L/min).
7. Fully rotate the N2O flow control knob and verify that there is no flow.
8. Fully rotate the AIR flow control knob and verify that there is no flow.
9. Connect the N2O line pressure hose from the wall supply. With the O2 flow control knob fully
opened, rotate the N2O flow control knob to ensure a continuous flow increase throughout its
full range.
NOTE: Make sure that the flow of N2O is at least 10 L/min.
10. Fully rotate the AIR flow control knob and verify that there is no flow.
11. Close all 3 flow control knobs and reconnect the AIR line pressure hose.
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