Invacare Platinum 5 Service Manual page 22

SECTION 4—TROUBLESHOOTING
SYMPTOM
LOW
CONCENTRATION
(Continued)
FLUCTUATING FLOW: Regulator/Flowmeter:
Platinum™Series
PROBABLE CAUSE
P.C. board:
a. Shifts at wrong pressures.
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.
a. Incorrectly set regulator.
b. Flowmeter malfunction.
Outlet HEPA filter:
a. Dirty or plugged
Check pressure at product tank. Pressure
should rise to 21 p.s.i. (25 p.s.i. for
Platinum 10) at shift point. If not, replace
P.C. Board. Refer to Replacing P.C. Board
on page 66.
a. Return flow to maximum setting.
b. Replace fitting.
c. Repair or replace. Refer to Replacing
Flowmeter on page 70.
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 the Platinum 5, XL, and 10
Concentrators on page 85.
a. Replace P.E. valve.
b. Replace P.E. valve. Refer to Replacing
P.E. Valve on page 53.
Replace P.C. board. Unit may need
retiming after board replacement. Refer to
Replacing P.C. Board on page 66.
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. ± 0.2 max. [34.4
kPa ± 6.89]), replace flowmeter.
Refer to Replacing Flowmeter on
page 70.
a. If low flow conditions persist, replace
outlet HEPA filter. Refer to Replacing
the Outlet HEPA Filter on page 27.
22
SOLUTION
Part No 1110538