DeVilbiss 525 Series Service Manual download pdf (Page 16)

LT-2023

8. Place valve plates on the compressor so that heads of reed valve

screws are aligned with the indentation in top of pistons.

9. Install the compressor heads so that the holes in the heads are

aligned with the holes in the compressor housing.

10. Secure compressor heads with the screws.

To replace the compressor:

CAUTION– The525DSconcentratorsuseaGSEcompressorwith

a22mfdcapacitor.The525KSconcentratorsusea

GSEcompressorwitha10mfdcapacitor.If

replacement is necessary, be sure the correct capacitor

is installed.

1. Inspect the motor mounts. Replace if damaged. Attach mounts to

compressor feet.

2. Inspect the capacitor to determine if replacement is necessary. If

capacitor is wrong value for compressor or replacement is desired,

refer to Capacitor section.

3. Reconnect hose to the compressor intake ﬁtting.

4. Position compressor on the base of the unit so that the studs on the

motor mounts protrude through the holes in the base of the unit.

5. Secure motor mounts with hex nuts.

6. Reconnect hoses to the ﬁttings at compressor exhaust and ﬁlter.

7. Reconnect the compressor electrical connector.

COOLING FAN

The cooling fan provides a constant air ﬂow to cool the compressor. The

cooling fan is located in the bottom of the unit below the compressor

(Figure 14).

A defective cooling fan may cause the compressor’s internal thermo-

protective device to activate and shut the compressor off. Should this

condition occur, the compressor will require several minutes for the

thermo-protective device to reset.

If the cooling fan is defective, it must be replaced:

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 cooling fan terminals.

5. Note the position of the fan and fan guard before removing the four

retaining screws that secure the fan to the base of the unit.

6. Remove the defective fan and secure the replacement fan in position

with the four retaining screws.

NOTE–Wheninstallingthefan,besuretheairowdirectionalarrowon

the side of the fan is directed away from the compressor and

fan guard is reinstalled properly.

7. Reconnect the electrical connector.

8. Reinstall the compressor.

FINAL CHECK VALVE

This check valve is located between the ﬁnal bacteria ﬁlter and the oxygen

outlet ﬁtting. This check valve allows oxygen to ﬂow only out of the unit.

When the unit is turned off and oxygen ﬂow stops, the check valve closes

to prevent water from being drawn into the unit.

A defective ﬁnal check valve may allow water to be drawn in from the

humidiﬁer bottle when the unit is turned off. This may occlude the ﬁnal

bacteria ﬁlter and/or the ﬂow meter causing a restriction of ﬂow and

making it difﬁcult to adjust the ﬂow rate.

To replace the final check valve (Figure 10):

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

2. Remove the front and back cabinets and loosen or remove the bib.

3. Remove the hose from the outlet side of the ﬁnal bacteria ﬁlter.

4. Remove the two screws from the back of the oxygen outlet ﬁtting

assembly and remove the assembly.

5. Remove the hose from each end of the ﬁnal check valve.

6. Attach the hoses to a new check valve. Make sure that the ﬂat side

of the check valve is directed toward the oxygen outlet ﬁtting.

7. Replace the outlet ﬁtting assembly and connect the hose to the ﬁlter.

8. Replace the bib and front and back cabinets.

FLOW METER

The pressure-compensated ﬂow meter has an accuracy level of ±5% at

full scale (exception: +0%,-5% at 5 lpm). The ﬂow meter on the

DeVilbiss Oxygen Concentrator is designed for use at 8.5 psi (58.6 kPa) at

ﬂow rates up to 5 lpm.

To check for leaks in the flow meter tubing:

1. Check for leaks using a certiﬁed leak detection solution such as

Snoop® or equivalent (must not contain ethylene glycol).

2. Apply leak test solution to all ﬁttings and hose connections with the

unit running.

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

valve or the main PC Board assembly.

3. f an air leak is present, the solution will bubble. All leaks should be

repaired before putting the concentrator back in service.

Electric Shock Hazard. Use caution when leak testing near

electrical connections.

To replace the flow meter (Figure 10):

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

2. Remove the front and back cabinets.

3. From behind the bib remove the 2 hoses from the ﬂow meter.

4. While squeezing tabs on ﬂow meter brackets, push the ﬂow meter

through the bib.

5. Install new ﬂow meter in bib and reconnect hoses.

HOUR METER

To replace the hour meter (Figure 9):

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

2. Remove the front and back cabinets and loosen the bib.

3. Disconnect the hour meter connector from the PC board.

4. Remove the meter by carefully inserting a small ﬂat screwdriver

under the outer edge of meter and prying upward.

5. Install a new hour meter by applying downward pressure until it

snaps into position.

6. Connect the hour meter to the PC board.

CAUTION– DonotapplyanyforceorexthePCBoardwhen

connecting or disconnecting electronic or pneumatic

components. Damage to the electronic assembly is

possible.

COMPONENT TESTING, REPAIR, AND REPLACEMENT

WARNING

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DeVilbiss 525 Series Service Manual Page 16

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