11
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, low output
flow or high pressure condition exists.
NOTE:
Low pressure and low flow are indicated by both a
visible and audible alarm. High pressure is indicated by a “pop-
ping” sound caused by the pressure relief valve.
NOTE: Non-OSD and early OSD models were equipped with
the low pressure alarm. Later OSD models are equipped with
the low flow alarm.
1. Connect test gauges.
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, this indicates that the four-way valve
is not shifting.
6. If the unit is cycling in conjunction with very high bed pres-
sures, 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.
WARNING: 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 nor-
mal bed pressures.
A.High pressures indicate defective sieve beds.
B. Low pressures indicate occluded filters, leaks, or defec-
tive compressor.
2. Check for oxygen leaks at:
• sieve beds • flow meter
• accumulator tank • final bacteria filter
• pressure regulator • final check valve
• OSD • outlet port
NOTE: Check for leaks using a certified leak detection solu-
tion.Apply leak test solution to all fittings and hose connec-
tions 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.
3. Test accumulator tank pressure. If pressure is lower than nor-
mal, then sieve bed check valves are defective.
NOTE: For normal system pressures refer to “Specifications”.
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