LTV 1150 - Page 98

Page 7-20 LTV
®
1200/1150 Ventilator Service Manual p/n 18603-001, Rev. C
Symptoms Possible Causes What to Do
Circuit leak.
Verify the sensitivity is set to an
appropriate value. For a high leak
environment, the sensitivity may need to
be set higher to prevent auto cycling.
Check for and correct airway circuit leaks.
Make sure all circuit accessories are
properly connected.
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.
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 or broken.
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.
Pressure Control or
Pressure Support set below
PEEP
Verify the control values are appropriately
set.
Failed auto zero.
Perform an auto zero under XDCR ZERO.
See the LTV
®
1200 or the LTV
®
1150
Ventilator Operator's Manual for more
information.
Bypass flexible tube
pinched.
Pinhole leaks in bypass
flexible tube.
If the bypass flexible tube is pinched, it
can usually be seen pressed against the
louver openings in the bottom of the
ventilator case.
Open the ventilator and remove the back
panel. Replace the back panel being sure
to fit the louvers in between the upper and
lower loop of the bypass flexible tube
before seating the back cover.
If the bypass flexible tube is leaking,
replace it.
Ventilator is auto
cycling
.
Sensitivity does not
appear to be accurate.
Failed calibration.
Recalibrate the vent. 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.