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SECTION 7
SERVICE INSTRUCTIONS
(A) Compressor
reed
valves,
teflon
ring,
or the
compressor
itself
may
be
defective.
(B) There is a severe leak in system.
(C) One or more of unit filters may be
occluded.
K.
Manifold Assembly
The manifold assembly is located on the front
of the vertical divider and has two externally
mounted
valves, the 4-way and
purge (see
Fig.
16).
These
valves
can
be
removed
separately for cleaning or replacement when
necessary. The base of the manifold assembly
does not have to be removed in this case.
The manifold
base contains internal check
valves, an orifice, and a pilot accumulator
cavity with check valve.
If troubleshooting
procedures reveal that a unit malfunction is
the result of a failure of one of these check
valves or any other internal problem, then the
entire manifold
base must be replaced. Do
not take the base of the manifold apart or
attempt to change any internal components.
To remove manifold:
1. Unplug unit from wal! outlet.
2.
Refer to service instruction B to open the
front cover.
3.
Cut the cable tie clamp
and
remove
the
center oxygen outlet tubing from the top
of the manifold assembly (8 Fig. 16).
NOTE: Care must be taken to avoid applying
a bending
force
which
could
result
in
breakage of the fitting on the manifold when
disconnecting this tubing.
4. Loosen hose clamps and remove the left
and
right sieve bed
oxygen
supply hoses
from the top of the manifold
assembly
(7,9 Fig. 16).
5.
Loosen
hose clamps and
remove
the left
and
right sieve
bed
hoses
from
the
bottom of the manifold unit (16 Fig. 11).
6.
Disconnect the wires from
the terminals
on the four way and purge pilot valves
(4,14 Fig. 16).
7. Remove the two manifold base mounting
screws located at the upper left and lower
right face of the manifold base.
8. Carefully pull the manifold assembly away
from the vertical divider a short distance
10/87
22
to gain access to the air inlet fitting on the
back of the manifold (see Figure 20).
9. Loosen
hose
clamp
and
remove
the
compressor
exhaust
hose
from
inlet
fitting (3 Fig. 20) and
remove
manifold
assembly.
NOTE: If a replacement manifold is not to be
installed immediately, the sieve bed
hoses
must
be tightly
sealed
to
prevent
bed
contamination.
To replace manifold:
1. Remove the 4-way and purge valves from
defective
manifold
and
install
them
on
the new manifold base.
2. Remove
protective
covers
from
hose
fittings on replacement manifold unit.
NOTE: Care should be taken to avoid scratch-
ing or otherwise damaging the fittings.
3. Attach the compressor
exhaust
to the
inlet fitting on back
of manifold
and
secure with hose clamp.
4. Position the manifold
assembly
on the
vertical
divider
and
secure with
two
screws in the upper left and lower right
corners.
5. Install first the right and then the left
sieve bed hoses on the fittings at the
bottom of the manifold unit and tighten
hose clamps.
6.
Install
the smaller
(1/8"
(3.2
mm)
1.D.)
oxygen tubing on the center fitting at the
top of the manifold
and secure with a
new cable tie clamp.
7. Install the right sieve bed oxygen supply
hose to the left manifold fitting, and the
left sieve bed oxygen supply hose to the
right
manifold
fitting.
Tighten
hose
clamps.
NOTE: Care must be taken to insure that the
right (inside) sieve bed hose is connected to
the
left
manifold
fitting,
and
the
left
(outside)
sieve
bed
hose
on
the
right
manifold fitting.
8. Connect the electrical wire pairs to the
pilot valves of the 4-way and purge.
NOTE: The yellow-brown wire pair connects
to the purge pilot valve (upper unit), and the
violet-brown wire pair connects to the four
way pilot valve (lower unit).
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