Service and repair
8-44
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
Figure 8-39. Exhalation check valve in position
8.9.5 Exhalation valve
(See Figure 8-35). Remove the exhalation valve as follows. Install by reversing removal
procedure.
1.
Remove exhalation assembly (Section 8.9.3).
2.
Remove heater and thermistor assemblies and spring clip from cross tube.
3.
Using 2.5-mm hex key and/or driver, remove three M3 x 8 POZIDRIV™* screws and split-
ring washers that attach exhalation valve to cross tube block, and three M3 x 8
POZIDRIV™* screws and split-ring washers that attach valve to flow sensor. Remove
valve.
8.9.6 Exhalation flow sensor assembly
(See Figure 8-35). Remove the exhalation flow sensor assembly as follows. Install by reversing
removal procedure.
1.
Remove exhalation assembly (Section 8.9.2).
2.
Using 3-mm hex driver, remove three M3 x 8 screws and split-ring washers that attach
flow sensor assembly to exhalation valve. Remove flow sensor assembly.
3.
Remove clip and heater from flow sensor assembly.
4.
Remove and save flow sensor tube assembly for reinstallation.
NOTE:
• Install the thermistor bead with the flow sensor assembly attaching screw, as shown
in Figure 8-36. Install the flow sensor assembly so the flat edge is as shown in
Figure 8-36.
• When installing a new flow sensor assembly, always (1) input the calibration
constant for the new assembly into NVRAM (Section 4), and (2) install calibration
constants label supplied over existing “FLOW SENSOR” section of Calibration
Constants label on underside of ventilator lid.
7-00203
Gasket
Brass knob
Check valve
Summary of Contents for Puritan Bennett 700 Series
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