DeVilbiss 525 Series Service Manual download pdf (Page 15)

LT-2023

COMPRESSOR

The DeVilbiss Oxygen Concentrator uses a double-head, oil-free

compressor. The compressor is secured to the base with four 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 Rebuild Kit (part

#525DZ-643).

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.

To test the compressor operating voltage (Fig 11):

The compressor requires line voltage to operate. If the compressor does

not start when the unit is turned on, the voltage input must be tested:

1. This voltage can be checked at the compressor connector using a

voltmeter or test light connected to the brown and blue wires. The

voltmeter is the best way to test.

2. If no voltage is detected, disconnect power and check for loose or

broken wires between the compressor connector and switch or

wire harness.

3. If there is voltage at the compressor connector, then either the

capacitor or the compressor itself is defective.

To test the compressor for proper output:

NOTE– If the compressor is not providing a high enough

output the patient alert system may be activated.

1. Remove the front and back cabinets.

2. Connect pressure-vacuum gauges to the sieve bed test points. See

the Sieve Bed Pressure Test in the Component Testing, Repair, and

Replacement section for details on attaching the gauge. A defective

compressor will be indicated by slowly rising pressure. Pressure may

only reach a certain level and then stop.

If these conditions are observed then:

• Theunitlter(s)maybeoccluded—checktheairlter,compressor

ﬁlter, and intake ﬁlter for occlusions.

• Theremaybeasevereleakinthesystem—checkforairleaksusing

a leak detection solution such as Snoop® or equivalent (must not

contain ethylene glycol).

CAUTION– Do not apply leak test solution to any part of the rotary

valve or the main PC Board assembly.

• Thecompressorreedvalves,cupseal,orthecompressoritselfmay

be defective.

If the ﬁlters are not occluded and no leaks are found, the compressor

must then be removed and repaired or replaced.

To remove the compressor:

1. Make sure the unit is unplugged from the wall outlet.

2. Disconnect the compressor wires by disconnecting the compressor

electrical connector (Figure 11).

3. Remove the ladder clamp and hose from the exhaust ﬁttings on the

compressor head (Figure 12) and compressor ﬁlter.

4. Carefully place the concentrator on its front side. From the bottom

of the unit, remove the four 10 mm hex nuts that secure the motor

mounts.

5. Lift compressor partially out of the compressor housing area and

loosen ladder clamp securing hose to the intake ﬁtting, then remove

hose.

6. Compressor may now be removed from the compressor housing

area.

CAUTION– If the unit has been running recently, the compressor

may be hot.

7. Unscrew motor mounts from compressor feet by hand.

To inspect and/or replace internal components

(Figs. 15 & 15A):

1. Remove the eight screws that hold the compressor heads in place.

When removing the heads, be sure to keep each head and its

components with the correct compressor side.

2. Check for proper placement of or damage to the gaskets on the

bottom of the compressor heads. Replace if damaged.

3. Remove reed valve plates. A reed valve is located on each side of the

valve plate.

4. The compressor reed valves should be ﬂush with the valve plate. If

the valve is broken or not ﬂush with the valve plate, or foreign

matter is detected inside the head, clean or replace the compressor

reed valves.

To replace the compressor reed valves (Fig. 15A):

a. Remove the screw holding the compressor reed valves in

position on the valve plate and discard the used reed valves.

b. Position the new reed valves so that they are centered and

completely cover the holes in the valve plate.

c. Place the metal retainer on the reed valves and secure with the

reed valve screw.

5. Check for proper placement of or damage to the rubber o-ring on

the bottom of the valve plate. Replace if damaged.

6. Remove piston sleeves by pulling upward and inspect cup seal on

pistons. Replace if badly worn or damaged.

To replace cup seal (Fig. 15A):

a. Remove rod screw from top of piston.

b. Remove the cup retainer plate.

c. Discard defective cup seal.

d. Place new cup seal into position.

e. Replace cup retainer plate.

f. Secure with screws.

7. Reposition sleeve on piston.

NOTE– In some cases, it may be easier to position sleeve on piston

before installing a new cup seal and retainer plate.

COMPONENT TESTING, REPAIR, AND REPLACEMENT

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DeVilbiss 525 Series Service Manual Page 15

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