Breathing System Checks Installation Guide
2 - 42 046-006272-00 A7™ Service Manual
2.5.3 Drive Gas Pressure Loss Alarm, N2O Cutoff Test
1. Close and remove all gas cylinders from the anesthesia system.
2. Connect the O2 and N2O 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 EFCS mode and set the N2O as balance gas.
4. Set the O2 flow to 2 L/min using the flow control valve.
5. Set the N2O flow to 2 L/min using the flow control valve.
6. Interrupt the O2 supply to the anesthesia system.
7. Verify that the flow of N2O and O2 stops within 2 minutes.
8. Verify the following alarms are activated:
• O2 Supply Failure appears on the screen.
• An alarm tone sounds.
9. Reconnect the O2 supply and disconnect the N2O line pressure hose
10. Verify the following alarms are activated:
• N2O Supply Failure appears on the screen.
• An alarm tone sounds.
11. Connect the AIR line pressure hose to the anesthesia system and set the AIR as balance gas.
12. Set the O2 flow to 2 L/min using the flow control valve.
13. Set the AIR flow to 2 L/min using the flow control valve.
14. Interrupt the AIR supply to the anesthesia system.
15. Verify the following alarm is activated:
• AIR Supply Failure appears on the screen.
• An alarm tone sounds.
16. Reconnect all line pressure hoses.
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