Sunrise Medical DeVilbiss 505DZ Service Manual page 20

A.
Visible Alarm
OFF
Other Symptoms
1.
Pulsating air noise.
2.
Excessive noise.
Fluctuating oxygen flow.
3.
4.
Little or no oxygen flow.
5.
Low oxygen concentration
and possible increase in
cycle time.
6.
Low oxygen concentration
and decrease in cycle time.
7.
Audible alarm does not
sound when unit is turned
"On" or during power
failure.
8.
Service Required light does
not illuminate when unit is
turned "On."
9.
Low pilot pressure and
possibly low oxygen
concentration.
T R O U B L E S H O O T I N G
Symptom
Audible Alarm
OFF
Possible Cause
1. Intake filter not in place or defective.
2. Compressor intake hose disconnected.
1. Loose or defective motor mounts.
2. Defective compressor.
3. Defective cooling fan.
1. Occluded humidifier.
2. Use of improper humidifier.
3. Occluded filters.
4. Occluded or defective cannula and tubing.
5. Use of excessive tubing.
6. Defective flow meter.
7. Leak in system.
8. Defective compressor.
9. Defective compressor reed valve.
10. Defective check valve.
11. Pressure regulator not adjusted properly or
defective.
1. Flow meter not adjusted properly
2. Hose disconnected to flow meter.
3. Oxygen delivery tubing is kinked or blocked.
4. Occluded humidifier.
1. Leak in system.
2. Defective sieve bed check valve.
3. Defective compressor reed valve.
4. Defective compressor.
5. Four-way valve not fully shifted.
6. Occluded filters.
7. Purge valve stuck in the deactivated position.
1. Contaminated sieve beds.
1. Unit has not been used for an extended
period of time.
2. Defective PC board.
3. Defective power switch.
4. Defective wire harness.
1. Defective PC board.
2. Defective light panel.
1. Leak in pilot pressure system.
2. Defective check valve in pilot accumulator
cavity of manifold.
3. Defective compressor reed valve.
4. Defective compressor.
Compressor
ON
Possible Remedy
1. Check filter and replace if necessary.
2. Reconnect hose.
1. Tighten or replace motor mounts.
2. Replace compressor.
3. Replace cooling fan.
1. Clean or replace humidifier.
2. Use only a bubble-type humidifier.
3. Clean or replace filters.
4. Detach cannula from oxygen delivery tubing. If
proper flow is not attained, check tubing for kinks or
other obstructions. Clean or straighten as required
or replace tubing if necessary.
5. The unit is designed to deliver 5 LPM with a cannula
on 50 feet (15 meters) of approximately 5/32" (4
mm) inside diameter tubing. Smaller diameter tubing
or the addition of any other flow restriction may
prevent obtaining the desired flow rate.
6. Replace flow meter.
7. Check for leaks in all hoses and fittings.
8. Replace compressor.
9. Replace compressor reed valve.
10. Replace manifold base.
11. Adjust or replace pressure regulator.
1. Adjust flow meter.
2. Reconnect hose.
3. Straighten tubing or remove obstruction.
4. Clean or replace humidifier.
1. Check for leaks in all hoses and fittings.
2. Replace manifold base.
3. Replace compressor reed valve.
4. Replace compressor.
5. Clean or replace four-way valve.
6. Clean or replace filters.
7. Refer to "How to Troubleshoot Purge Valve."
1. Replace sieve beds.
1. Allow unit to run for 20 minutes and retry.
2. Replace PC board.
3. Replace power switch.
4. Replace wire harness.
1. Replace PC board.
2. Replace light panel.
1. Check for leaks in all pilot pressure hoses and
fittings.
2. Replace manifold base.
3. Replace compressor reed valve.
4. Replace compressor.
20
Power Light
ON