Installation/Sequence Of Operation - Invacare 6LXO2 Service Manual

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Table of Contents

INSTALLATION / SEQUENCE OF OPERATION

MODEL 3LX and MODELS 5LX,5LXO2, 5LXO2T, 6LXO2, 6LXO2T

INSTALLATION / VERIFICATION OF BATTERY FREE

When your new Invacare concentrator arrives, it should be checked for proper operating conditions.

1. If the unit has been in below-freezing temperatures, allow it to warm up to room temperature (approxi-

mately 30 minutes) before operating.

2. The concentrator will need to be turned on for 4 to 5 seconds to charge the Battery Free

Connect power cord to outlet and turn the concentrator on. Turn flow control knob counterclockwise and flow will

begin immediately. Set flow rate of the Invacare 3 to 3 L/min., Invacare 5 to 5 L/min. and the Invacare 6 to 6 L/min.

Turn unit off.

3. Unplug the power cord and press On/Off switch to the ON position. An intermittent audible alarm will

sound. This confirms proper operation of the Battery Free

OFF.

4. Connect cord to outlet and turn on concentrator. Unit will sound 3 BEEPS on startup.

5. Check the oxygen concentration per specifications after 30-40 minutes running time.

SEQUENCE OF OPERATION

Applying 120 VAC via the power switch energizes the compressor motor, hour meter, cooling fan and the

printed circuit (P.C.) board.

Room air enters the compressor via the cabinet filter, compressor inlet filter, and sound muffler. The air is

compressed by the wobble pistons in the compressor to a pressure of 20 PSI (137.72 kPa) BEFORE

Serial No. "97K" or 21 PSI (144.79 kPa) AFTER Serial No. "97K".

As increased pressure creates increased temperature, a heat exchanger is utilized to lower the tempera-

ture by 20

F (6.7

C) before the air enters the 4-way valve. It is then channeled to a sieve bed containing

the adsorption material. A restrictor downstream of the sieve bed causes pressure to build up inside the

sieve bed which is necessary for the adsorption process. A small amount of relatively pure oxygen enters

the top of the second bed with the balance entering a storage tank. The nitrogen removed is exhausted

back from the bed through the four-way valve into room air. A muffler is located at the exhaust end of the

valve to muffle the sound of the exhaust as it exits the concentrator.

The oxygen not being used to exhaust is channeled into the storage tank. The pressurized oxygen is

regulated down to 5 PSI (34.4 kPa), enters an accurate flow-measuring device, flows through a bacterial

filter, a check valve and out to the patient.

The electrical activation of the 4-way valve is accomplished every 8 to 21 seconds by the pressure sensor

and P.C. board electronics when the pressure set point of 20 + 3 PSI (137.72 + 51.32 kPa) BEFORE

Serial No. "97K" or 21 + 3 PSI (144.79 + 51.32 kPa) AFTER Serial No. "97K" is reached. The time

between cycles is dependent on altitude, flow rate and internal environmental factors.

On the 5LX/5LXO2/5LXO2T/6LXO2/6LXO2T, a P.E. or Pressure Equalization valve opens just prior to

the shift of the 4-way valve. This allows highly concentrated oxygen to enter the just exhausted bed from

the top. This additional pressure allows the bed to start its cycle at a higher pressure. The P.E. valve will

close just after the shift of the 4-way valve.