DeVilbiss 525 Series Service Manual download pdf (Page 9)

LT-2023

TROUBLESHOOTING

SIMPLIFIED TROUBLESHOOTING

The key to simple troubleshooting is to recognize which type of problem exists and select the most effective approach to solving the problem. The

different types of problems and the approaches for solutions are as follows:

Type I—The unit runs but a low pressure and flow or high pressure condition exists.

NOTE–Lowpressureorowareindicatedbybothavisibleandaudiblealarm.Highpressureisindicatedbya“popping”soundcausedbythe

pressure relief valve.

1. Connect test gauges to sieve bed tests points (Figure 9).

2. Refer to the Normal Operating Sequence to make sure the unit is cycling properly.

3. If bed pressure is rising slowly, check for occluded ﬁlters and severe leaks. If ﬁlters are clean and there are no leaks, then the compressor is

defective.

4. If the pressure relief valve is releasing pressure, observe whether the unit is cycling or not.

5. If the unit is not cycling or has uneven bed pressures, this indicates that the rotary valve is not operating correctly. Refer to the Rotary Valve Testing

described in the chapter Component Testing, Repair and Replacement.

6. If the unit is cycling in conjunction with very high bed pressures, this indicates defective sieve beds.

Type II—The compressor will not start when the unit is turned on.

1. Verify that the cooling fan is running; if it is not, determine where you are losing power.

2. Check for compressor voltage at the compressor connector.

3. If voltage is present, then the capacitor or compressor is defective.

4. If voltage is not present, the wire harness is defective.

Electric Shock Hazard. Extra care should be taken if it is necessary to operate the unit with the cabinet removed.

Mechanical Hazard. Keep fingers, loose clothing, etc. away when working on compressor.

Type III—The concentrator runs and continues to cycle but has low oxygen concentrations.

1. Connect test gauges and check for higher or lower than normal bed pressures.

a. High pressures indicate defective sieve beds.

b. Low pressures indicate occluded ﬁlters, leaks, or defective compressor.

c. Uneven bed pressures indicate valve is not operating correctly.

2. Check for oxygen leaks at:

 • sievebeds • owmeter

 • accumulatortank • nalbacterialter

 • pressureregulator • nalcheckvalve

 • outletport

NOTE–CheckforleaksusingacertiedleakdetectionsolutionsuchasSnoop®orequivalent(mustnotcontainethyleneglycol).Applyleaktest

solutiontoallttingsandhoseconnectionswithunitrunning.Ifanairleakispresent,thesolutionwillbubble.Allleaksshouldberepaired

before putting the unit back in service.

CAUTION– Do not apply leak test solution to any part of the rotary valve or the main PC Board assembly.

3. Test accumulator tank pressure. If pressure is lower than normal, then sieve bed check valves are defective.

NOTE–FornormalsystempressuresrefertoSpecications.

WARNING

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DeVilbiss 525 Series Service Manual Page 9

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