Invacare IRC5PAW Service Manual page 20

SECTION 4—TROUBLESHOOTING
SYMPTOM
Low Concentration
(Continued)
Fluctuating Flow:
Unit Excessively Loud:
Perfecto2™
PROBABLE CAUSE
Flowmeter:
a. Flowmeter opened beyond
maximum flow rate.
b. Cracked or broken fitting.
c. Input tubing leaking or loose.
Timing.
P.E. valve:
a. Bad coil.
b. Restrictor blockage.
Inspect P.C. board restrictor tubing
for kinks or tears.
Regulator/Flowmeter:
a. Incorrectly set regulator.
b. Flowmeter malfunction.
Outlet HEPA filter:
a. Dirty or plugged
Pneumatic exhaust:
a. Muffler cracked, damaged or
missing.
b. Muffler tubing disconnected or
damaged.
Compressor inlet filter missing and/or
orange sticker removed.
Compressor removed.
Incorrect style of inlet filter
(aftermarket).
20
SOLUTION
a. Return flow to maximum setting.
b. Replace fitting.
c. Repair or replace. Refer to Replacing
Flowmeter on page 63.
To accommodate for varying tolerances
when replacing components, an adjustable
timer is used to control the shifting of the
Pressure Equalization (P.E.) valve. Refer to
Timing on page 73.
a. Replace P.E. valve.
b. Replace P.E. valve. Refer to Replacing
P.E. Valve on page 42.
Replace P.C. board. Unit may need
retiming after board replacement. Refer to
Replacing P.C. Board on page 58.
a. Check pressure at oxygen outlet.
Adjust regulator.
b. If flow is still unstable, check for leaks
starting at the compressor outlet
fitting through all pneumatic
connections. If no leaks are found
and flow is still fluctuating, replace
the regulator. If pressure at test point
is within spec (5 p.s.i. ± 0.5 max.
[34.4 kPa ± 6.89]), replace
flowmeter. Refer to Replacing
Flowmeter on page 63.
a. If low flow conditions persist, replace
outlet HEPA filter. Refer to Replacing
the Outlet HEPA Filter on page 25.
a. Replace. Refer to Replacing the
Muffler Assembly on page 26.
b. Reconnect or replace tubing.
a. Replace compressor inlet filter. Refer
to Replacing the Compressor Inlet
HEPA Filter on page 26.
a. Replace Compressor. Refer to
Replacing Compressor Assembly on
page 31.
a. Replace with factory OEM sound
reduced style inlet HEPA filter.
Part No 1154245