CareFusion LTV 1200 Service Manual page 90

Symptoms
Delivered pressure is
high.
Monitored pressure is
high.
p/n 18603-001, Rev. J
Possible Causes
Diaphragm is incorrectly
seated in exhalation valve.
High or low side sense line
or elbow at patient wye
loose or leaking.
High or low sense lines are
occluded.
High or low sense ports in
the wye are occluded.
Failed auto zero.
VHome setting does not
match flow valve.
Failed calibration.
Defective flow valve.
Defective turbine.
®
LTV 1200, 1150, and 1100 Ventilator Service Manual
What to Do
Open the exhalation valve and remove the
diaphragm. Reseat the diaphragm and
snap the valve cap back in place. See
Cleaning the Reusable Exhalation Valve
and Patient Circuit in Chapter 4 for a
diagram of the exhalation valve assembly.
Check high and low pressure sense lines
to be sure they are correctly attached and
securely seated at both the ventilator and
wye ends.
Check the Luer fitting connections for
leaks.
Check the elbow connectors at the wye to
be sure they are not loose.
Verify lines are not occluded or pinched.
Check the exhalation drive line at both the
ventilator and exhalation valve ends. Verify
the line is securely seated and not leaking.
Perform an auto zero under XDCR ZERO.
®
See the LTV 1200, 1150, or 1100
Ventilator Operator's Manual for more
information.
Correct the VHome setting. See Chapter 6
- Maintenance & Calibration.
Recalibrate the ventilator. See Chapter 6 -
Maintenance & Calibration for instructions.
If the problem reoccurs after careful
recalibration, a transducer may be drifting
excessively. Perform the Advanced Vte
Diagnostic Procedures, see page 7-23.
Calibrate the flow valve. See Flow Valve
Calibration in Chapter 6 for instructions.
Clean the Flow Valve following the Flow
Valve Cleaning Procedure, see page 8-66.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
If testing and cleaning fails, replace the
Flow Valve. See Chapter 8 - Flow Valve
Assembly and Cleaning Instructions.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
If testing fails, replace the turbine. See
Chapter 8 - Turbine Manifold.
Page 7-13