33373-001 Version A
Q. Why does the circuit hum between breaths?
A. This is an annoyance and not a critical issue. The inspiratory hold check valve is vibrating. This is more
prevalent in disposable circuits as the sound resonates through the thin tubing noticeably louder. The
check valve can be repositioned by turning the inspiratory piston ¼ turn.
Q. QHow do I find the hours of operation on this vent?
A. Enter the “Extended Functions” screen and select the “Date & Time” button. You will find Turbine and
Machine hours both listed.
Q. Why do I have event messages in my event log stating “INVALID SERIAL NUMBER”?
A. Due to the redesign of the main pcb from S/N AHT07500 forward, the S/N is stored on the small
peripheral pcb mounted on the rear panel. When the battery tray is removed for maintenance or just to
move it and you disconnect the communications cable mounted to the battery tray this message will
appear when you power up the ventilator with the cable disconnected.
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