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C O M P O N E N T T E S T I N G , R E PA I R A N D R E P L A C M E N T
4.
Carefully place compressor in compressor box so that motor mount threads
are protruding through the holes in the base of the unit.
5.
Lean unit backwards slightly and reinstall motor mount nuts.
NOTE– Ensure the compressor mounting and retaining plates are positioned
properly to prevent excessive noise and vibration.
6.
Reconnect intake hose beneath intake filter.
7.
Rotate heat exchange tube to the left 90°.
8.
Install compressor filter by attaching tubing and ladder clamps to
compressor exhaust fitting and heat exchange tube. Ensure heat exchange
tube is not touching mounting plate or fan guard.
9.
Reconnect compressor electrical connector.
COOLING FAN
The cooling fan provides a constant air flow to cool the compressor. The cooling
fan is located in the bottom of the unit below the compressor.
A defective cooling fan may cause the compressor's internal thermo-protective
(thermal cut off) device to activate and shut the compressor off. Should this
condition occur, the compressor will require several minutes for the thermo-
protective device to reset.
If the cooling fan is defective, it must be
replaced:
1.
Make sure the unit is unplugged from the wall outlet.
2.
Use the Cabinet Removal instructions listed previously to open the unit.
3.
Use the To Remove the Compressor instructions listed under Compressor.
4.
Disconnect the cooling fan connector from the PC board.
5.
Note the position of the fan, wires and fan guard before removing the four
retaining screws that secure the fan to the base of the unit.
6.
Remove the defective fan and secure the replacement fan in position with
the four retaining screws.
NOTE– When installing the fan, be sure the air flow directional arrow on the
side of the fan is directed away from the compressor and fan guard is reinstalled
properly.
7.
Reconnect the electrical connector.
8.
Reinstall the compressor.
FLOW METER
The DeVilbiss 1025 series oxygen concentrator flow meter (1025D-607) has an
operating flow rate of 2-10 LPM. Flows below 2 LPM may cause the low flow
alarm to activate.
NOTE– Do not use a low output flow meter.
The flow meter is pressure compensated and has an
accuracy level of ±5% of full scale at all liter flows except at
10 LPM. Accuracy at 10LPM is +0% / -5%. The flow meter
can be locked using a 1/16th inch Allen wrench and
tightening the locking screw behind the flow meter knob.
Locking Screw
To check for leaks in the flow meter tubing:
1.
Check for leaks using a certified leak detection solution such as Snoop® or
equivalent (must not contain ethylene glycol).
2.
Apply leak test solution to all fittings and hose connections with the unit
running.
LT-2329
CAUTION
Do not apply leak test solution to any part of the rotary valve or the
main PC Board assembly.
3.
I f an air leak is present, the solution will bubble. All leaks should be repaired
before putting the concentrator back in service.
WARNING
Electric Shock Hazard. Use caution when leak testing near electrical
connections.
To replace the flow meter:
1.
Make sure the unit is unplugged from the wall outlet.
2.
Use the Cabinet Removal instructions listed previously to open the unit.
3.
From behind the front cabinet, remove the 2 hoses from the flow meter.
4.
Unscrew both the top and bottom flow meter fittings and remove the flow
meter by pushing it out through the front cabinet.
5.
Install new flow meter and reconnect hoses.
HOUR METER
The digital hour meter can be seen on the status indicator panel and is mounted
directly onto the PC board. If the hour meter malfunctions, the PC board will
need to be replaced.
Refer to PC board replacement instructions on page 24.
MANIFOLD
The manifold is attached to the accumulator tank and performs the same function
as a purge harness. It directs a small amount of pressurized oxygen into the
discharging sieve bed to aid the nitrogen exhaust process while it ensures that
the majority of pressurized oxygen is directed into the accumulator tank. The
manifold also prevents reverse flow of oxygen from the accumulator to the sieve
beds.
See CHECK VALVES: MANIFOLD and SIEVE in this manual for additional
information.
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Troubleshooting
