Simplified Troubleshooting - Sunrise Medical DeVilbiss Serie Manual De Servicio

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 flow 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 7).
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 indi-
cates 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 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.
LT-1928
T R O U B L E S H O O T I N G
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 defective
compressor.
c. Uneven bed pressures indicate valve is not operating cor-
rectly.
2. Check for oxygen leaks at:
• sieve beds
• accumulator tank
• pressure regulator
• outlet port
NOTE: Check for leaks using a certified leak detection solu-
tion such as Snoop
glycol). 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.
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 nor-
mal, then sieve bed check valves are defective.
NOTE: For normal system pressures refer to Specifications.
10
• flow meter
• final bacteria filter
• final check valve
® or equivalent (must not contain ethylene