TROUBLESHOOTING
7-2 SERHT50NA A0808
Ventilator fails
System Leak Test.
PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION
Pump is pulling in air from around the
air inlet filter cover.
Muffler Assembly is disconnected or
leaking or is cracked.
Silicone cuff around ends of muffler
may be old.
Make certain that the filter media is
positioned within the counterbore of the
cover and that the thumbscrews are
tightened securely.
Verify Muffler Assembly is securely
connected to both the pump inlet and the
air intake. With the air intake filter cover
removed, verify that the end of the muffler is
flush with the ventilator housing. Visually
inspect muffler assembly for cracks.
Replace if cracked.
Replace as needed.
Ventilator fails
Pressure Transducer
and/or Pressure Relief
Valve calibration.
Leak in the patient circuit Assembly
Torn or improperly sealed manifold
diaphragm.
Make certain that the humidifier chamber is
bypassed for these tests. The breathing
circuit tubing should be directly connected
to the GAS OUTPUT connector. Also, verify
that the exhalation valve is not leaky at the
highest pressure level. If so, replace
exhalation valve.
Note: When performing the Pressure
Relief Valve calibration, if an alternate
Newport approved exhalation v
alve is used
it may begin to leak at lower maximal
pressures than the permanent blue
exhalation valve. This is a limitation of the
exhalation valve and the HT50 driving
pressure. The ventilator is performing
appropriately.
Remove manifold pump and inspect
disphragm. Replace if damaged.
Low proximal pressure
(Paw), but normal flows.
Faulty patient breathing circuit.
Humidifier chamber leaking.
Pressure transducer out of calibration.
Faulty exhalation valve.
Pressure relief valve or emergency
intake valve leaking.
Check breathing circuit for leaks and/or
proper connections.
Bypass chamber and retest. If problem is
solved, loosen, reposition, and tighten
chamber cover. Retest.
Calibrate entire HT50 (see Section 5)
Recalibrate exhalation valve (Section 5). If
problem persists, replace valve.
Check both valves for proper sealing.
Perform the Pressure Relief Valve
calibration (Section 5).
MECHANICAL & PNEUMATIC TROUBLESHOOTING
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