AirSep Centrox User manual

INSTRUCTION MANUAL
Centrox
PSA Oxygen Concentrator

Ownership Data
Take a moment to note important information below about your AirSep Centrox PSA
Oxygen Concentrator. Keep this instruction manual, along with your invoice, to serve as
a permanent record of your purchase.
PSA Oxygen Concentrator
Model Number
Serial Number
Invoice Date
Start-up Date
AirSep Representative
Company
Contact
Address
City/Town
State
Zip/Postal Code
Country
Fax
Phone
Cell
Before you attempt to install, operate, or repair the oxygen
concentrator, read and thoroughly understand this instruction
manual. Improper operation can result in severe bodily injury,
damage to the oxygen generator, or poor performance.

Symbols/Abbreviations
Symbols are frequently used on equipment in preference to words with the intention
of lessening any possibility of misunderstanding caused by language differences.
Symbols can also permit easier comprehension of a concept within a restricted
space.
The following table is a list of symbols and denitions that may be used with AirSep
oxygen equipment. These symbols are referenced from the appropriate International
Electro-technical Commission (IEC) standards:
Symbol Description Symbol Description
ON (power switch on) 0OFF (power switch off)
No smoking Do not disassemble
Date of manufacture Consult instructions for use
Warning – Describes a hazard or
unsafe practice that if not avoided
can result in severe bodily injury,
death or property damage
See Instructions
Caution – Describes a hazard or
unsafe practice that if not avoided
can result in minor bodily injury or
property damage
Safety agency for CAN/CSA
C22.2 No. 601.1 M90 for medical
electrical equipment
Note – Provides information
important enough to emphasize
or repeat
Keep unit and accessories dry
Manufacturer
Proper disposal of waste
of electrical and electronic
equipment required
Use no oil or grease Do not expose to open ames
Catalog number Keep in the vertical position
Safety agency for CAN/CSA
C22.2 No. 601.1 M90 for medical
electrical equipment
Serial number
Fragile – handle with care
EC REP
Authorized Representative in the
European Community

Tables of Contents
1.0 Introduction
1.1 GENERAL 9
1.2 WARNINGS, CAUTIONS, AND NOTES 9
1.3 REFERENCES TO CONTROLS AND INDICATORS
WITH LABELS 9
2.0 Safety
2.1 GENERAL 11
2.2 POTENTIAL HAZARDS 11
2.3 SAFETY PUBLICATIONS 13
3.0 System Description
3.1 INTRODUCTION 15
4.0 Controls, Parts, and Connections
4.1 INTRODUCTION 17
4.2 OXYGEN CONCENTRATOR CONTROLS AND INDICATORS 17
4.3 OXYGEN CONCENTRATOR PARTS 20
4.4 AUXILIARY KITS INFORMATION (OPTIONAL) 23
4.5 CONNECTIONS 25
5.0 Installation
5.1 UNPACKING 27
5.2 PRE-INSTALLATION GUIDELINES 29
5.3 INSTALLATION INSTRUCTIONS 30
6.0 Operation
6.1 INITIAL START-UP 33
6.2 OPERATION 36
6.3 SHUTDOWN 37
6.4 NORMAL START-UP 37
6.5 START-UP AFTER AN EXTENDED SHUTDOWN 37

7.0 Maintenance/Service
7.1 WEEKLY MAINTENANCE 39
7.2 SEMI-ANNUAL MAINTENANCE 40
7.3 ANNUAL MAINTENANCE 42
7.4 PRESSURE SWITCH ADJUSTMENT PROCEDURE 43
8.0 Troubleshooting
8.1 TROUBLESHOOTING CHART 48
8.2 SOLENOID VALVE TROUBLESHOOTING 55
A. Appendix Technical Data
A.1 SPECIFICATIONS 59
A.2 DRAWINGS AND SCHEMATICS 60
B. Appendix Warranty/Returns
B.1 PRODUCT WARRANTY 65
B.2 LIMITS OF LIABILITY 66
B.3 RETURNING THE OXYGEN CONCENTRATOR OR A
COMPONENT FOR SERVICE 66
C. Appendix
C.1 OXYGEN GENERATOR DECOMMISSIONING AND DISPOSAL
GUIDELINE 69

List of Figures and Tables
Figure 3.1: Centrox Oxygen Concentrator 15
Figure 4.1: Air Compressor Module 17
Figure 4.2: PSA Concentrator Module Controls and Indicators 18
Figure 4.3: Compressor Module Internal Components 20
Figure 4.4: PSA Module Internal Components 21
Table 4.1: Optional Starter Kits for the Concentrator Purchased 23
Table 4.2: Description of the Parts included in the Starter Kits 24
Figure 4.5: Oxygen Receiver 25
Figure 5.1: General Arrangement of the Centrox Concentrator 31
Figure 6.1: PSA Module Supply Valve Assembly 36
Table 7.3: Maintenance Chart 39
Figure 7.1: Pressure Switch 44
Table A.1: Centrox Specifications 59
Figure A.1: Flow Schematic 60
Figure A.2: Wiring Schematic (120 V, 60 Hz) – PSA Module 61
Figure A.3: Wiring Schematic (240 V, 50 Hz) – PSA Module 62
Figure A.4: Wiring Schematic (120 V, 60 Hz) – Compressor Module 63
Figure A.5: Wiring Schematic (240 V, 50 Hz) – Compressor Module 64

Centrox Instruction Manual 9
AirSep Corporation
1.0 Introduction
1.1 GENERAL
This instruction manual provides a description of the AirSep Centrox Pressure Swing
Adsorption (PSA) Oxygen Concentrator as well as instructions for its installation,
operation, and maintenance. Pertinent drawings and component information are
also included.
To ensure safe operation and proper system maintenance, AirSep Corporation
recommends that you keep this instruction manual readily available for reference.
1.2 WARNINGS, CAUTIONS, AND NOTES
As you read the instruction manual, pay special attention to the Warning, Caution,
and Note messages. They identify safety guidelines or other important information
as follows:
Provides information that can prevent severe bodily injury or death.
Provides information that can prevent minor bodily injury or
property damage.
Provides information important enough to emphasize or repeat.
1.3 REFERENCES TO CONTROLS AND INDICATORS
WITH LABELS
This operating manual uses uppercase characters (e.g., ON/OFF switch) to refer
to controls and indicators. Refer to section 4 for a description of all the controls and
indicators of the oxygen concentrator.

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AirSep Corporation
2.0 Safety
2.1 GENERAL
Oxygen, the most abundant of the elements, makes up about 50 percent of the
earth’s crust. In its free state, it forms about one-fth of our air by volume. Although
oxygen is classied as a non-ammable gas, it supports combustion. As an active
element, it combines directly or indirectly with all elements except the rare gases. It
is an invisible gas that is colorless, odorless, and tasteless.
To ensure your safety, thoroughly read and familiarize yourself with this Safety
section. AirSep Corporation strongly recommends that you review this section
periodically.
2.2 POTENTIAL HAZARDS
Before you attempt to install, operate, or repair the Centrox Oxygen Concentrator,
read and thoroughly understand this instruction manual. Improper operation can
result in severe bodily injury, damage to the system, or poor performance.
It is recommended to have an alternate source of oxygen supply if
a power failure or equipment malfunction occurs.
Take extreme care to keep all the oxygen piping and vessel clean.
To avoid a re or an explosion, oxygen clean all surfaces that can
come in contact with oxygen. Check all oxygen ttings/joints for
leaks with an oxygen-compatible leak-detecting solution.
Always place power cords in a manner that prevents trip or
possible accidental strangulation.

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AirSep Corporation
Oxygen vigorously accelerates the burning of combustible
materials. In an oxygen-enriched atmosphere, many materials that
do not burn in normal air require only a slight spark or moderate
heat to set them aame.
To avoid a re or an explosion, keep gasoline, kerosene, oil,
grease, cotton bers, paint, and any other combustible material
away from any part of the Centrox Oxygen Concentrator or optional
auxiliary oxygen receiver.
Do not smoke or use an open ame near the oxygen concentrator
or optional auxiliary oxygen receiver.
Post “NO SMOKING OR OPEN FLAMES” signs in the area where
the oxygen concentrator and optional auxiliary oxygen receiver
are located. AirSep STRONGLY recommends that only individuals
trained and experienced in the safe handling of oxygen operate this
system.
The interior of the Centrox Oxygen Concentrator contains electrical
parts that can produce an electrical hazard if not handled properly.
To prevent electrical shock, read and thoroughly understand the
Troubleshooting section of this instruction manual before you
service the system.
Connect the oxygen concentrator power cord to a properly
grounded wall outlet on a circuit that cannot be accidentally turned
off. Do not use extension cords.
To prevent re or electrical shock, locate the oxygen concentrator
and the auxiliary oxygen receiver (if supplied) indoors away from
rain or any other type of moisture.
Disconnect power before servicing oxygen generator
To prevent re or product oxygen contamination, locate the unit
away from hazardous fumes, chemical or pollutants.

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AirSep Corporation
2.3 SAFETY PUBLICATIONS
This section is not a complete summary of required safety procedures. Review the
following publications for additional information on the safe handling of oxygen:
■“Installation of Bulk Oxygen Systems at Consumer Sites;” NFPA No.
50; National Fire Protection Association; 1 Batterymarch Park; P. O.
Box 9101; Quincy, Massachusetts 02269-9101 USA.
■“Oxygen;” Pamphlet G-4; Compressed Gas Association; 1725
Jefferson Davis Highway; Arlington, Virginia 22202-4102 USA.
■“Cleaning Equipment For Oxygen Service,” Pamphlet G-4.1;
Compressed Gas Association; 1725 Jefferson Davis Highway;
Arlington, Virginia 22202-4102 USA.

Centrox Instruction Manual 15
AirSep Corporation
3.0 System Description
3.1 INTRODUCTION
Air Contains 21 % oxygen, 78% nitrogen, 0.9% argon, and 0.1% other gases.
AirSep Oxygen Concentrator separates this small percentage of the oxygen from
the compressed air through a unique Pressure Swing Adsorption (PSA) process.
The Centrox unit consists of two modules. The smaller module contains two
compressors that supply air for the process. Each compressor has a dedicated
switch and circuit breaker. The cord from the module plugs in to the PSA module.
This cord must not be plugged in to any other power supply outlet. Circuitry inside
the PSA module controls the power supplied to the compressors. The power cord
from the PSA module plugs into the wall. Figure 3.1 shows the two modules of the
Centrox oxygen concentrator.
PSA Concentrator
Module
Air Compressor
Module
Figure 3.1: Centrox Oxygen Concentrator
The air compressor module (See Figure 3.1) supplies pressurized air to the PSA
concentrator module. Inside the PSA concentrator module, the pressurized air
enters the feed & waste manifold (See Figure 4.4). A series of valves in the feed &
waste manifold controls the ow of air into each of the adsorber beds (See Figure
4.4). Valves also connect the beds to two mufers (See Figure 4.4) that allow waste
gas to be vented from the beds. The oxygen concentrator uses in its adsorber
vessels an inert ceramic material called molecular sieve to separate compressed
air into the oxygen and the other gases. The unique properties of molecular sieve
allow it to attract, or adsorb, nitrogen physically from air under pressure. This allows
oxygen to exit the adsorbers as a product gas. Oxygen from top of the beds then
ows to the check valve assembly and then to the product manifold (See Figure
4.4). The check valve assembly supplies product oxygen to the ow controller. The
product manifold controls the ow of oxygen from one bed to another during various
stages of the oxygen generating process. The product oxygen then ows through

16 Centrox Instruction Manual
AirSep Corporation
the product valve to the customer’s application. An oxygen analyzer continuously
monitors the purity of oxygen and provides an alarm in case of low purity.
The entire oxygen generating process is completely regenerative, which makes it
both reliable and virtually maintenance-free. The molecular sieve does not normally
require replacement.
This instruction manual serves as the guidelines for the Centrox oxygen concentrator.
Refer to the illustrations, located in the Appendix A of this instruction manual, for
the detailed ow diagram and electrical schematic of the oxygen concentrator
referenced in this instruction manual.

Centrox Instruction Manual 17
AirSep Corporation
4.0 Controls, Parts, and Connections
4.1 INTRODUCTION
The section describes the various parts, controls, indicators
and connections required for the Centrox oxygen concentrator.
4.2 OXYGEN CONCENTRATOR CONTROLS AND INDICATORS
4.2.1. COMPRESSOR MODULE
Figure 4.1 shows the compressor module along with all the controls and
indicators.
Air Intake Filters
On/Off Switch
Circuit Breaker
Reset Buttons
Hose for
Compressed Air to
PSA Concentrator
Module
Figure 4.1: Air Compressor Module
ON/OFF (Power) Switch
The individual ON/OFF switches (green color) on the compressor module starts
and stops the operation of the oxygen compressors. When you supply power to the
system, the green indicator light of the switches turns on. It remains lit whether the
switch is in the ON or OFF position (See Figure 4.1).

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AirSep Corporation
Circuit Breaker Reset Buttons
The individual circuit breaker reset buttons on the compressor module are used to
reset the compressors after an electrical overload shutdown (See Figure 4.1).
4.2.2. AIR INTAKE FILTERS
Located on the left side panel, the air intake lter removes any foreign particles
from the air that enters the compressor module (See Figure 4.1).
Fuses/Circuit Breakers, if required, must be replaced with the same
type and amp rating as the original.
4.2.3. PSA MODULE
Figure 4.2 shows the controls and indicators of the PSA concentrator module.
Feed Air
Pressure Gauge
Product
Pressure Gauge
Low Purity
Light
Low Purity
Alarm
On/Off
(Power)
Auto/Manual
Switch
Hour Meter
Figure 4.2: PSA Concentrator Module Controls and Indicators

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AirSep Corporation
ON/OFF (Power)Switch
The ON/OFF switch starts and stops the operation of the oxygen concentrator.
When you supply power to the system, the switch’s green indicator light turns on. It
remains lit whether the switch is in the ON or OFF position (See Figure 4.2).
AUTO/MANUAL Switch
The AUTO/MANUAL switch includes a blue indicator light. In the AUTO position, the
concentrator cycles on and off to meet oxygen demand. In the MANUAL position,
the concentrator cycles continuously. The concentrator produces oxygen only while
the blue light is lit (See Figure 4.2).
Hour Meter
The hour meter indicates the total number of hours the concentrator has cycled
(See Figure 4.2).
Low Purity Light
The unit is equipped with an oxygen sensor. If the purity supplied to the tank is
below 85 % (± 3%), the red light on the PSA concentrator module will be on (See
Figure 4.2).
Low Purity Alarm
If the purity is below 85 % (± 3%) for more than 30 minutes, an audible alarm will
sound (See Figure 4.2).
The low oxygen purity alarm will sound for 4 seconds when the unit
is turned on.
Feed Air Pressure Gauge
The FEED AIR PRESSURE gauge indicates the pressure of the feed air before it
enters the PSA concentrator module (See Figure 4.2).
Product Pressure Gauge
The PRODUCT PRESSURE gauge indicates the pressure of oxygen coming out of
the adsorber beds (See Figure 4.2).

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AirSep Corporation
4.3 OXYGEN CONCENTRATOR PARTS
Figure 4.3 and Figure 4.4 show the internal components of the Centrox oxygen
concentrator.
4.3.1. COMPRESSOR MODULE
Compressors
Cabinet Fans
Heat Exchanger
Coils
Check Valve
Assembly
Resonators
Figure 4.3: Compressor Module Internal Components
Compressors
The compressors compress the air entering the module before it is supplied to the
PSA concentrator module (See Figure 4.3).
Cabinet Fans
The cabinet fans provide internal cooling for the air compressor. Fans also help in
better circulation of the air inside the compressor module (See Figure 4.3).
Compressor Intake Filter
This lter provides additional ltration for the air as it enters the air compressor. This
lter is attached to the gray PVC pipe. The complete assembly of the PVC pipe and
the lter is called resonator(See Figure 4.3).
Heat Exchanger
The heat exchanger coils cool the compressed air leaving the compressor module
(See Figure 4.3).