Sunrise Medical DeVilbiss 505DZ Service Manual page 35

C O M P O N E N T T E S T I N G , R E P A I R & R E P L A C E M E N T
To test the compressor for proper output:
NOTE—If the compressor is not providing a high enough output, the cycle time will be long and the patient alert system might be activated.
1. Remove the front and back cabinets.
2. Connect a set of pressure-vacuum gauges to the test points on the top of the manifold assembly. A defective compressor will be
indicated by slowly rising pressure. Pressure may only reach a certain level and then stop and eventually activate the long cycle
alarm.
If these conditions are observed then:
• The unit filter(s) may be occluded - check the air filter, intake filter, and the compressor filter for occlusions.
• There may be a severe leak in system - check for air leaks using a leak detection solution.
• Compressor reed valves,Teflon ring, or the compressor itself may be defective (refer to Figure 35).
If the filters are not occluded and no leaks are found, the compressor must then be removed and repaired or replaced.
To remove compressor:
1. Ensure the unit is unplugged from the wall outlet.
2. Disconnect the compressor wires by disconnecting the white electrical connector (Figure 30).
3. Remove hose clamp and tubing from the outlet fitting on the compressor filter (Figure 33).
Sandwich Type
Motor
mount
Nut
Bubble Type
Motor
mount
Compressor
mounting screw
Compressor filter
Pressure relief
valve
Motor mount
screw
Figure 31
35
Pressure
exhaust fitting
Compressor
Motor
mount
Compressor
mounting plate