Sunrise Medical DeVilbiss 505DZ Service Manual page 22

E.
Visible Alarm
ON
Other Symptoms
1.
Fan operating.
2.
Unit warm to the touch
and cannot be restarted for
several minutes.
3.
Fan operating, D16 or D16
& D18 illuminated on PC
board.
4.
Compressor ran then shut
off, fan operating, D17 or
D17 & D18
illuminated on PC board.
5.
Fan operating, D17 & D16
or all three indicator lights
illuminated on PC
board.
F .
Visible Alarm
ON
Other Symptoms
1.
Fluctuating or no flow.
NOTE – When unit runs for a short time and stops and any of the red diagnostic lights illuminate, connect gauges and look for
proper operating sequence.
NOTE – Refer to Diagnostic System for explanations of the various diagnostic lights and alarms.
T R O U B L E S H O O T I N G
Symptom
Audible Alarm
ON
Possible Cause
1. Wiring harness disconnected/defective.
2. Loose compressor wire.
3. Defective capacitor.
4. Defective PC board.
5. Defective compressor.
1. Compressor overheated due to:
a. Occluded filters.
b. Restricted input or output air passage.
c. Low or high line voltage.
2. Defective cooling fan.
3. Defective compressor.
1. Four-way valve failed to shift properly.
2. Contaminated sieve beds.
1. Maximum cycle time was exceeded due to
a. Leak in system.
b. Defective compressor reed valve.
c. Defective compressor.
d. Four-way valve not fully shifted.
1. Purge valve stuck in activated position.
2. Defective PC board.
Symptom
Audible Alarm
ON
Possible Cause
1. System pressure bnelow 9 PSI
or 62 kPa due to:
a. Leak in system.
b. Defective compressor.
c. Four-way valve not fully shifted.
Compressor
OFF
Possible Remedy
1. Reconnect/replace wiring harness.
2. Tighten or attach wire.
3. Replace capacitor.
4. Replace PC board.
5. Replace compressor.
1. a. Clean or replace filters.
b. Remove obstruction.
c. Check line voltage, use alternate circuit
independent of other appliances.
2. Replace cooling fan.
3. Replace compressor.
1. Refer to How to Troubleshoot Four-Way Valve.
2. Refer to How to TroubleshootSieve Beds.
a. Check for leaks in all hoses and fittings.
b. Replace compressor reed valve.
c. Replace compressor.
d. Clean or replace four-way valve.
1. Refer to How to Troubleshoot Purge Valve.
2. Replace PC board.
Compressor
OFF
Possible Remedy
a. Check for leaks in all hoses and fittings.
b. Replace compressor.
c. Clean or replace four-way valve.
22
Power Light
ON
Power Light
ON