AirSep MN126-1 C - Manual (Page 13)

AirSep Corp. — FreeStyle Service Manual 2-1
2.0 Operation Check and Test of Oxygen Concentration
2.1 Description of Operation
Air enters the FreeStyle Oxygen Concentrator through an external air intake /
gross particle filter. This filtered air enters the compressor via a suction intake
muffler that quiets the compressor’s suction sound. Pressurized air then exits
the compressor and passes through a heat exchanger to reduce the
temperature.
Next, a two-way solenoid feed valve directs the air into one of two sieve beds
that contain molecular sieve. The unique property of molecular sieve enables
it to physically attract (adsorb) nitrogen when air passes through this material,
thereby separating the nitrogen from the oxygen in ambient air.
There are two sieve beds: While one produces high-concentration oxygen, the
other is purged of the nitrogen it adsorbed (collected) while it made oxygen.
Oxygen exits the product tank after first passing through the integrated
product filter.
In addition to the molecular sieve beds that allow oxygen to be separated from
air, FreeStyle contains an Oxygen Conserving Device (OCD) valve that
controls delivery of high-concentration oxygen to the patient at the point in
the breathing cycle when the patient starts to inhale.
FreeStyle delivers a gas consisting of 90% (+5.5/-3% )oxygen at pulse flow
rates from approximately 1–3 LPM equivalency.
2.2 Operation Check
AirSep tests every FreeStyle Oxygen Concentrator thoroughly after
manufacture. You must perform the following test to ensure that no damage
occurred in shipping or handling.
1. Connect the power cord of the unit, and turn the unit on by pressing
flow setting [-2]. Check to see that the following sequence occurs:
a. A brief, continuous alarm sounds to indicate that FreeStyle has been turned on.
b. The compressor runs.
c. After a 10 second start up is complete.
d. Exhaust air flows from the unit.
2. Perform an oxygen concentration test, as described in Section 2.4.