Operator’s Manual LTV
®
Series ventilator Page 15-5
p/n 10664, Rev. Y
Ventilator Performance
Symptoms Possible Causes What to Do
Ventilator is
autocycling,
monitored volumes
are very small, RT
XDCR DATA item
FTx shows negative
flows during
exhalation and
positive flows during
inspiration.
Sense lines are
reversed.
The sense lines are not designed to be removed
from either the wye or the luer fittings. If the
sense lines have been removed and replaced
incorrectly, they may not seal correctly when
replaced. Replace the patient wye and sense
lines with a known good assembly.
Diaphragm installed
backwards or
incorrectly seated in
exhalation valve.
Open the exhalation valve and remove the
diaphragm and spring. Reseat the spring and
diaphragm valve and snap the peep valve or
peepless valve cap back in place. See page 13-
11 for a diagram of correct exhalation valve
assembly.
Sense lines occluded or
pinched.
Check high and low pressure sense lines to be
sure they are correctly attached and securely
seated at both the ventilator and wye ends.
Verify lines are not occluded or pinched.
Ventilator won’t allow
patient to exhale.
Internal problem with
the ventilator.
Immediately contact a certified Pulmonetic
Systems’ service technician.
Set pressure not
reached and turbine
is humming.
Turbine sounds like
inspiration even
during exhalation.
Failed calibration or
internal problem with
the ventilator.
Immediately contact a certified Pulmonetic
Systems’ service technician.
Monitored volume is
high.
Delivered volume is
high.
Very small ET tube
connected directly to
wye.
A very small ET tube connected directly to the
wye may cause turbulence that causes the flow
differential to be read incorrectly. To reduce this
turbulence, add a short larger bore extension
between the ET tube and wye. In this case, the
monitored volume is high, but the delivered
volume is accurate.
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