DeVilbiss DeVO/MC44-90 - Page 13

SECTION 6
TROUBLESHOOTING GUIDE
Symptom
Possible Problem Suggested Remed
Visible | Audible | Compressor Other ! ' * 99 y
Alarm Alarm On or Off Symptoms
6. OFF OFF ON Fluctuating | Occluded humidifier Clean or replace humidifier
flee Use of improper humidifier Use only a bubble type humidifier
Occiuded filters Clean or replace filters
Occluded or defective cannula Detach cannula from O2 delivery
and tubing tubing. If proper flow is not at-
tained, check tubing for kinks or
other obstructions. Clean or
straighten as required or replace
tubing if necessary.
Use of excessive tubing The unit is designed to deliver 5
Ipm with a cannula on 50 feet (15
meters) of approximately 5/32”
(4mm) inside diameter tubing.
Small diameter tubing or the addi-
tion of any other flow restriction
may prevent obtaining the desired
flow rate.
Defective flow meter Replace flow meter
Air leak in system Check for leaks in all hoses and
fittings
Defective compressor Replace compressor
Defective reed valve Replace reed valve
Defective check valve Replace manifold base
Pressure regulator not adjusted |] Adjust or replace pressure
properly or defective regulator
7. OFF OFF ON Littleorno {Flow meter not adjusted Adjust flow meter
oxygen properly
flow Hose disconnected to flow Reconnect hose
meter
Oxygen delivery tubing is Straighten tubing or remove
kinked or blocked obstruction
Occluded humidifier Clean or replace humidifier
8. OFF OFF ON Audible Defective 9 voit battery Replace 9 volt battery
alarm does Defective wire harness Repair or replace wire harness
when unit _ | Defective sonalert Replace MC board
isturned on } Defective MC board Replace MC board
9. OFF OFF ON Low 02 Leaks in system Check all hoses and fittings
on sn Defective check valves Replace manifold base
possible Defective reed valve Replace reed valve
increasein | Defective compressor Replace compressor
cycle time | Four-way valve not fully shifted | Clean or replace four-way valve
Occluded filters Replace filters
Purge valve stuck in de- Refer to Section 7, Service Instruc-
activated position tions, on How to Trouble-shoot
Purge Valve
10. OFF OFF ON Low 02 Contaminated sieve beds Replace sieve beds
concentra-
tion and
decrease in
cycle time
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