Accumulator Pressure Test; Capacitor; Compressor - Sunrise Medical DeVilbiss Serie Manual De Servicio

C O M P O N E N T T E S T I N G , R E P A I R , A N D R E P L A C E M E N T

ACCUMULATOR PRESSURE TEST

To check accumulator pressures:
1. Make sure the unit is "Off."
2. Remove front and back cabinets.
3. Use the pressure-vacuum gauge (part #PVO2D-601) and pressure
test assembly (part #303DZ-637) included in the Service Kit.
4. Remove the tubing cap from the accumulator tank fitting and
attach the 1/16" (1.6 mm) diameter tubing from the gauge to
the accumulator tank fitting just vacated above.
5. Turn the unit "On" with the flow rate set to maximum recom-
mended flow.
During each timed cycle, the average pressure in the oxygen
accumulator will rise and fall.
NOTE: Normal pressures observed depend on altitude and
flow rate. Increases in altitude and flow rate will slightly
decrease accumulator pressures. Decreases in the two variables
will slightly increase accumulator pressures. Acceptable accumu-
lator pressure swing ranges at various altitudes at the maxi-
mum recommended flow are identified in the Specifications.
NOTE: A defective check valve may cause a rapid drop in
accumulator pressure below the minimum value.
NOTE: A defective compressor will be indicated by slowly
rising pressure. Pressure may only reach a certain level and
then stop.
Low oxygen concentration levels and accumulator pressures
higher than normal may indicate defective sieve beds. Severely
contaminated beds may also cause the pressure relief valve on
the compressor to open.
NOTE: A malfunctioning rotary valve will also cause high
accumulator tank pressure and activation of the pressure relief
valve. In this case it should be determined whether the prob-
lem is with the sieve beds, valve, or both.

CAPACITOR

The capacitor enables the compressor to start and run by sup-
plying voltage to the windings of the compressor motor. A
defective capacitor will result in the compressor running slower
or not starting.
CAUTION: The 515ADS and 515ADZ concentrators
use either a Thomas compressor with a 15 mfd capaci-
tor or a GSE compressor with a 22 mfd capacitor. If
replacement is necessary, be sure the correct capaci-
tor is installed.
CAUTION: The 515AKS and 515AKZ concentrators
use a GSE compressor with a 10 mfd capacitor. If
replacement is necessary, be sure the correct capaci-
tor is installed.
WARNING: Electric Shock Hazard.When replacing
the capacitor, do not touch the terminals or allow
metal objects to come in contact with the terminals
on the capacitor.The capacitor may hold a charge for
several days after the unit is turned off.
If a defective capacitor is suspected, a new one must be
installed.The capacitor is strapped into a well molded into the
bottom of the unit (Figure 10) next to the cooling fan.
To replace the capacitor:
1. Make sure the unit is unplugged from the wall outlet.
2. Remove the front and back cabinets.
3. Remove the compressor.
4. Disconnect the two wires from the terminals on the capacitor.
5. Cut the nylon cable tie holding the capacitor in place and
remove the capacitor.
6. Reconnect the wires to the new capacitor.
7. Install the new capacitor and secure with a new cable tie.
8. Replace the compressor.
9. Replace the front and back cabinets and secure with the
six screws.

COMPRESSOR

The DeVilbiss Oxygen Concentrator uses a double-head, oil-
free compressor.The compressor is secured to the compres-
sor plate with four rubber motor mounts.
A compressor that is worn or defective may:
• cause pressure to rise slowly.
• cause excessive noise and/or vibration.
• cause lower oxygen concentrations.
A worn or defective compressor can be caused by a defective
internal component such as:
• reed valve
• o-ring
• gasket
• cup seal
These components are included in the Compressor Service
Kit (part #515DZ-643,Thomas or #515ADZ-643, GSE).
CAUTION: The 515A series concentrators use either
a Thomas compressor or a GSE compressor. Be sure
to order the correct part number when rebuilding the
compressor.
NOTE: A built-in thermal cutoff switch will shut the compressor
off if it becomes overheated.This protects the compressor from
damage caused by heat build-up. (Some models have an auxiliary
thermostat mounted within the compressor compartment.)
NOTE: A pressure relief (PR) valve is located on the pressure
head to prevent high pressure build up in the system should a
component malfunction occur.
15 LT-1928