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14. Operational Considerations
14.1 General
14.1.1 Ventilation Off Mode
Warning: The user should never enter Ventilation Off mode when connected
to a patient. The ventilator does not ventilate in this mode.
14.1.2 Gas Input Pressures
The ventilator requires the gas input pressures to be between 4-5bar. The
ventilator can operate with the gas pressures at 3-4bar, but when there is a high
demand for gas, No O
2
Supply or No Air Supply alarms can be triggered. This is
due to the supply regulators becoming unbalanced as demand for one gas
exceeds its ability to supply. The imbalance is recognized by the ventilator as
being the absence of one of the gases.
14.1.3 Mode Memory On Power Up
The ventilator retains the last ventilation mode and settings for 2 minutes after
being powered down. Re-starting the ventilator after 2 minutes will cause it to
enter the Ventilation Off mode. If restarting within the two minute memory period
the user will have to re-calibrate the flow sensor only, all other settings are
retained.
14.1.4 Back Up Battery Power
The ventilator has a back up battery power supply that will continue to operate the
ventilator in the event of mains power failure (45 – 60min depending on the
ventilatory mode being used). The operation of the ventilator does not change
when on the reserve power supply.
The ventilator can be used with a completely discharged battery, but a note must
be taken that in the event of a mains power failure the ventilator will cease to
ventilate the patient.
It is recommended that the ventilator be allowed to charge the battery by being in
standby mode for a minimum of 24 hours prior to first use. During use the
ventilator will keep the batteries fully charged.
In the event of a mains power failure a Main Power Fail alarm will sound and be
displayed in the alarm panel. The alarm is high priority.
When ventilating a patient on battery power in a mains power fail situation an
alternative form of ventilation must be made available and the patient must be
transferred to this alternative means of ventilation when the battery low condition
appears. The ventilator will cease to ventilate the patient once battery power is
exhausted. The ventilator will warn the user in the alarm panel when the back-up
battery is reaching its fully discharged state.
Once all battery power has been exhausted the complete power fail alarm will
sound.
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