DeVilbiss DeVO/MC44-90 - Periodic Maintenance

SECTION 4
MAINTENANCE PROCEDURES
Intake Bacteria Filter - The intake bacteria
filter (5 Fig. 6) should be inspected at the
same time the felt pre-filter is inspected
and changed when needed (approxi-
mately every six months).
To replace the intake bacteria filter:
A. Pull the bacteria filter out of the
rubber grommet (See Fig. 6).
B. Remove the felt pre-filter assembly.
Place the feit pre-filter assembly on a
new bacteria filter.
D. The complete filter assembly can then
be inserted into the rubber grommet.
Audible Alarm - Testing the audible alarm
system should be included in a routine
maintenance program. !t should be
checked on a monthly basis.
A. To test the audible alarm system,
remove the line cord from the 220
volt AC outlet and turn the power
switch to the “ON” position. if the
alarm is not heard or sounds weak,
replace the 9 volt battery (20 Fig. 11)
located on the front of the vertical
divider.
B. Plug the unit into a 220 volt AC outlet
and turn the power switch to the
“ON” position. The alarm will sound
momentarily. If the alarm is not heard
or sounds weak replace the 9 voit
battery.
NOTE: Replacement batteries can be
purchased locally and should be alkaline
batteries or equivalent.
02 Concentrations - Oxygen concentra-
tions should be checked monthly in
accordance with the established test
procedures (Section 4, A).
NOTE: Before checking concentrations,
the oxygen analyzer should be properly
calibrated using a 100% pure oxygen
source. It should also be noted that
changes in temperature, altitude, or hu-
midity may affect the oxygen concen-
tration reading as shown by the analyzer.
Therefore, the analyzer should be
calibrated in similar conditions to where
the concentrator is located.
С. Periodic Maintenance
10/87
Final Bacteria Filter - The final bacteria
filter (3 Fig. 12) should be changed as
needed (approximately once a year under
normal conditions).
To replace the final bacteria filter:
A. Loosen the cabinet fasteners on the
top and sides of the unit.
Swing the front cover to the right.
C. Remove hose clamp and hose from
each end of filter and discard filter.
D. Install new bacteria filter and secure
with hose clamps.
E. Replace cover and secure with cabinet
fasteners.
Compressor Filter - The compressor HEPA
filter (12 Fig. 14) should be changed at or
before 25,000 hours of unit operation.
To replace compressor filter:
A. Refer to Service Instruction B to open
cabinet covers. The back cover should
be completely removed.
B. Cut plastic cable tie that holds HEPA
filter in place.
C. Loosen hose clamps and remove black
rubber hose from both ends of filter.
D. Install new HEPA filter with air flow
directional arrow pointing downward
and secure with plastic cable tie.
NOTE: Holes for cable tie are located
directly behind left sieve bed. Thumb
screws and brackets that secure beds to
unit must be removed so that cable tie
can be inserted into holes.
E. Attach black rubber hoses to each end
of filter and secure with hose clamps.
F. Replace cabinet covers and secure
with cabinet fasteners.
Compressor - Inspect and change if
necessary the internal components at
10,000 hour intervals of unit operation.
See Service Instruction |.
NOTE: All routine and periodic
maintenance should be recorded by
listing the date and hour readings in a
maintenance schedule like the one
shown on the following page.