4/Tests and Troubleshooting
4-30 1503-0151-000 5/26/0
Calibrate Flow Valve
The software prompts the user to perform the procedural steps to calibrate the flow
valve. This is an automated calibration. It gradually opens the flow valve and mon-
itors the manifold pressure. When the manifold pressure reaches 1.9 to 2.0
cmH
2
O the value at which the flow valve has been opened is saved. The flow valve
is then closed. The value at which the flow valve was opened to is then checked
to make sure it is within the correct tolerance. If it is not, the calibration fails. If the
calibration passes, the flow valve calibration point is stored in the EEPROM.
Remarks: Check that the bag/vent selection switch is in the vent position. If the
flow valve calibration test fails immediately, the most likely fault is a bad manifold
transducer. It can also be a bad regulator or the regulator is out of calibration. An-
other cause could be a bad flow valve.
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