A7™ Service Manual 046-006272-00 3 - 37
Periodic Maintenance Breathing System Checks
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 A7 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
3.10.2.1 BFCS Test
1. Close and remove all gas cylinders from the anesthesia system.
2. Connect only the O2 line pressure hose to the anesthesia system from the wall supply. Leave all
other line pressure hoses disconnected.
3. Turn the unit on and set the A7 in BFCS mode, Rotate the O2 needle valve knob to ensure a
continuous flow increase throughout its full range. Set the O2 flow to 2L/min.
4. Fully rotate the AIR needle valve knob and verify that there is no increase of total flow. Close the
AIR valve.
5. Disconnect the O2 line pressure hose from the anesthesia system, and connect the AIR line
pressure hose from the wall supply.
6. Rotate the AIR needle valve knob to ensure a continuous flow increase throughout its full range.
7. Set the AIR flow to 2L/min.
8. Fully rotate the O2 needle valve knob and verify that there is no increase of total flow.
9. Close the AIR and O2 valves.
10. Disable Backup Flow Control.
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