Cabinet Removal; Accumulator Pressure Test; Capacitor - DeVilbiss 525DS Service Manual

5-liter compact oxygen concentrator
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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

caBineT reMoval

To remove front and back cabinets (Fig. 3):
1.
Ensure the unit is unplugged from the wall outlet.
2.
Using a screwdriver, remove the six screws that hold the back
cabinet to the internal structure and the bib.
noTe–
Allsixscrewsarethesamesize.
3.
Remove the back cabinet by sliding it toward the rear until clear.
4.
Remove the front cabinet by pushing the top shoulders toward the
back of the unit, then outward away from behind the bib. Tilt the
top of the front cabinet forward until it can be pulled out of the base
of the unit.
5.
To reassemble, reverse steps 2-4.
The majority of all the servicing and repairs can be done without
removing the front bib. However, to gain access to the components
behind the bib, it may be loosened or removed.
To loosen the bib (Figure 11):
1.
Remove the two screws (located directly above the hour meter) that
hold the bib to the unit's internal structure. This will allow access to
the components behind the bib.
To remove the bib completely (Figure 11):
1.
Remove the two screws as above.
2.
Disconnect the ribbon connector from the PC board.
3.
Disconnect the lines from the power switch and circuit breaker.
Mark these wires accordingly.
4.
Tilt the top of the bib forward to release it from the slot in the body
of the concentrator.
5.
Remove the hose connected to the bottom of the flow meter.
To reassemble bib:
1.
Reconnect the wires and hose.
2.
Insert the bib tab into the slot above the rotary valve, and push until
it snaps into place.
3.
Secure bib with two screws.

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
recommended flow.
During each timed cycle, the average pressure in the oxygen accumulator
will rise and fall.
noTe–
 N ormalpressuresobserveddependonaltitudeandflowrate.
Increasesinaltitudeandflowratewillslightlydecrease
accumulator pressures. Decreases in the two variables will
slightly increase accumulator pressures. Acceptable
accumulator pressure swing ranges at various altitudes at the
maximumrecommendedflowareidentifiedinthe
Specifications.
LT-2023
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 problem is with the
sieve beds, valve, or both.

caPaciTor

The capacitor enables the compressor to start and run by supplying
voltage to the windings of the compressor motor. A defective capacitor
will result in the compressor running slower or not starting.
cauTion– The525DSconcentratorsuseaGSEcompressorwith
a22mfdcapacitor.Ifreplacementisnecessary,be
sure the correct capacitor is installed.
cauTion– The525KSconcentratorsuseaGSEcompressorwith
a 10 mfd capacitor. If replacement is necessary, be
sure the correct capacitor 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 14) 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.
14

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