Ventilator & Calibration Troubleshooting
906-0731-04-01 Rev. C ZOLL Ventilator Service Manual 6–15
Exhalation Backup and
Autocal Valve
Control Valves are exercised to ensure they
open and close as expected.
For both 4 cmH2O and 25 cmH2O pressure
targets, normalize waveforms and verify the
following:
1) Autocal rise settling time < 30ms
2) Autocal fall settling time < 30ms (<150ms
RCS 8)
3) Exhalation valve rise delay < 45ms
4) Exhalation valve fall delay < 45ms
5) Backup valve rise delay < 45ms
6) Backup valve fall delay < 45ms
7) Pressure difference between exhalation
valve drive port and airway pressure < 2.0
cmH2O.
• Check setup for leaks or assembly error check lung.
• Change the SPM Assembly.
Breath Performance
Testing
Checks ventilator tidal volume and selected
parametric values.
Target Settings:
VT=700; FIO2=21; BPM=20; Itime=1000;
PEEP=0
VT=100; FIO2=21; BPM=30; Itime=667.67;
PEEP=5
VT=700; FIO2=60; BPM=20; Itime=1000;
PEEP=0
VT=100; FIO2=60; BPM=30; Itime=667.67;
PEEP=5
VT=700; FIO2=100; BPM=20; Itime=1000;
PEEP=0
VT=100; FIO2=100; BPM=30; Itime=667.67;
PEEP=5
Tolerances:
VT: ± (5ml + 8% of setting)
PEEP: ± (2cmH2O + 7.5% of setting)
PIP: ± (2 cm H2O + 7.5% of setting)
BPM: ±1
FIO2: ± (3% + 8% of setting)
I Time: ± (100ms)
NOTE: For mixed flows, only FIO2 is checked
due to calibration issue with TSI
• Check Set Up
• Remove Resistor from compressor intake.
• Remove High Pressure 02 Orifice / Resistor left on
the device.
• Check test lung for proper inflation and uniformity
• Check O2 cell for leaks, it's a two piece assembly
which may unscrew or leak
• Check 22ml bacterial filter for cracks, leaks
• ensure that the circuit is laying flat on the work
bench, with the exhalation valve in the upright
position
• flush the o2 circuit before any retry, recal the O2
sensor.
• Replace the O2 sensor if FIO2 issues persist.
• If the vent can't capture PEEP, check the Anti-
Asphyxia valve for damage or debris
• Recalibrate the ventilator
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