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TROUBLESHOOTING GUIDE
T
SYMPTOM:
R
O
LOW CONCENTRATION,
U
Continued:
B
L
E
S
H
O
O
T
I
N
G
FLUCTUATING FLOW:
UNIT EXCESSIVELY LOUD:
NOTE: REFER TO THE REPAIR/REPLACEMENT GUIDE IN THIS MANUAL FOR PROPER
TROUBLESHOOTING GUIDE
PROBABLE CAUSE:
11.Flowmeter.
a. Flowmeter opened beyond
maximum flow rate.
b. Cracked or broken Fitting.
c. Input tubing leaking or loose.
12.Timing.
13. P.E. Valve.
a.Bad Coil.
b.Restrictor Blockage.
14. Inspect P.C. Board Restrictor
tubing for kinks or tears.
1. Regulator/Flowmeter.
a. Incorrectly set regulator.
b. Flowmeter malfunction.
2. Bacteria Filter
a. Dirty or Plugged
1. Pneumatic Exhaust.
a. Muffler cracked, damaged or
missing.
b. Muffler tubing disconnected or
damaged.
2. Intake Resonator.
a. Damaged or missing.
b. Tubing disconnected or dam-
aged.
3. Inlet Filter missing.
4. Compressor.
REPLACEMENT OR ADJUSTMENT PROCEDURES
11a.Return flow to maximum setting.
11b.Replace fitting.
11c. Repair or replace.
12. To accommodate for varying
13a.Replace P.E. Valve (PROCE-
13b. Replace P.E. Valve (PROCE-
14. Replace P.C. Board. Unit may
1a.Check pressure at oxygen outlet.
1b.If flow is still unstable, check for
2a. If low flow conditions persists,
1a.Replace. (PROCEDURE 2).
1b.Reconnect or replace tubing.
2a.Install new resonator.
2b.Reconnect tubing or replace.
3. Replace inlet filter.
4. Replace Compressor. Internal
18
SOLUTION:
tolerances when replacing com-
ponents, an adjustable timer is
used to control the shifting of the
Invacare 5 Pressure Equaliza-
tion (P.E.) Valve (PROCE-
DURE 18).
DURE 3).
DURE 3).
need retiming after board
replacement (PROCEDURE
11).
Adjust Regulator (PROCEDURE
6).
leaks starting at the compressor
outlet fitting through all pneumatic
connections. If no leaks are found
and flow is still fluctuating, replace
the regulator (PROCEDURE 6).
If pressure at test point is within
spec (5 p.s.i. + 0.2 max. [34.4 kPa
+ 6.89]), replace flowmeter
(PROCEDURE 14).
replace bacteria filter.
damage (PROCEDURE 7).
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