Gas Flow Theory of Operation
1 - 30 046-001141-00 A5/A3™ Service Manual
Mechanical and manual ventilation modes are selected through the Auto/Manual ventilation switch
(41). When the Auto/Manual switch is placed in the Manual position, the operator squeezes the
manual bag (42) to supply gas for the breathing system. The APL valve (43) is used to adjust the
pressure inside the pneumatic circuit in case of manual ventilation. When the Auto/Manual switch is
placed in the Auto position, the A5/A3 starts its ventilator to mechanically assist or replace the
spontaneous breathing of the patient. The ventilator controls the drive gas to depress the folding bag
inside bellows (45) and supply gas for the breathing system according to the selected ventilation
mode.
The breathing system is connected to the anesthesia machine main unit through the circuit adapter.
The breathing system is highly integrated, as its tubes are all internal except the tube connected to
the patient and the O2 cell cable, as shown below.
FIGURE 1-21 Breathing System
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