A7™ Operating Instructions 046-004667-00 3 - 15
System Interface Fresh Gas Flow Display
• The fresh gas flow resumes at the settings from before entering the Flow Pause state.
• Ventilation resumes in the same ventilation mode and with the same parameter settings as
before entering the Flow Pause state.
• All physiological alarms are enabled.
3.3.3 Backup Flow Control System
When the A7 System detects a failure related to the EFCS, then the backup flow control system
(hereinafter referred to as BFCS) automatically deploys and the total flow rotameter illuminates. If the
BFCS is deployed due to a failure, contact a service personnel to disable the BFCS.
FIGURE 3-22 shows BFCS display screen.
FIGURE 3-22 Backup Flow Control System
There is 1 L/min of O
2
flow automatically when the BFCS is deployed and turning the flow control
knobs will only increase the flow from 1 L/min. When BFCS is in use, you can adjust flow via flow
control knobs. The total flow rotameter indicates the total flow. Approximate the O
2
flow and air flow
based on the O
2
concentration displayed on the screen. You can turn on or off the audio of Alarm
Backup Flow Control is enabled by selecting the Audio On or Audio Off toggle button. When the
alarm is audio off, the icon displays in the right of the alarm display area. This Audio off button
can only turn off the Backup Flow Control technical alarm and the Electronic Flow Control Fail alarm.
When EFCS is active, you can deploy BFCS by pushing the BFCS button. To disable BFCS, close the
flow knobs first and then select the Disable Backup Flow Control button on the main screen. Next,
you select Ye s from the pop-up dialog box to disable BFCS.
When the alarm Low Battery Voltage! occurs, the system automatically deploys the BFCS
inactivating the Disable Backup Flow Control button. Connect to the AC power supply as soon as
possible. After connecting to the AC power supply, the Disable Backup Flow Control button is
enabled. Press this button and select Ye s from the pop-up dialog box to disable the BFCS.
Audio On/Off button
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