AirSep AS-20 User Manual (English)

Questions and Answers:

K
Kara FrenchAug 22, 2025
What to do if the AirSep AS-20 Oxygen Equipment doesn't operate, the green light is on, the amber light is off, and the oxygen pressure is low?
- L
  Logan GarciaAug 22, 2025
  If your AirSep Oxygen Equipment doesn't operate, the green light is on, the amber light is off, the switch is set to AUTO, and the oxygen pressure is less than 275 kPa (40 psig), it could be due to several reasons. The ON/OFF switch might be set to OFF, or the switch itself could be defective. There might be a loose or defective power wire to the circuit board, the pressure switch could be improperly set or defective, or the circuit board might be faulty. To resolve this: * Ensure the ON/OFF switch is set to ON. * Replace the ON/OFF switch if it's defective. * Repair or replace any loose or defective wiring. * Adjust the pressure switch as described in Chapter 7. * Replace the pressure switch if necessary. * Replace the circuit board if it's defective.
T
Timothy HoAug 25, 2025
Why does my AirSep AS-20 run continuously, but the oxygen pressure is low?
- W
  wellslindseyAug 25, 2025
  If your AirSep Oxygen Equipment runs continuously but the oxygen pressure is less than 275 kPa (40 psig), this may be due to inadequate feed air pressure, inadequate cycle pressure, or the oxygen demand exceeding the generator's capacity. To address this, ensure the feed air valves are fully open and lines are unobstructed. Adjust or replace the feed air regulator if needed. Also, check the oxygen usage and inspect the unit, oxygen hoses, and piping for any leaks.
Z
Zachary ThomasAug 26, 2025
What causes continuous operation and high pressure in my AirSep Oxygen Equipment?
- J
  Jacob MannAug 26, 2025
  If your AirSep Oxygen Equipment operates continuously with the amber light on and the pressure exceeding 400 kPa (58 psig), it could be due to an improperly set or defective pressure switch, a loose or defective power wire to the pressure switch, or a defective AUTO/MAN switch or circuit board. Try adjusting the pressure switch as described in Chapter 7. If that doesn't work, you may need to replace the pressure switch, repair or replace the wire, or replace the AUTO/MAN switch or circuit board.
D
darlene18Aug 27, 2025
How to troubleshoot an AirSep AS-20 Oxygen Equipment that won't cycle and the green light is off?
- C
  Colleen Sullivan MDAug 28, 2025
  If the green light on the ON/OFF switch of your AirSep Oxygen Equipment doesn't illuminate and the generator doesn't cycle, it could be due to a lack of electrical power or a blown fuse. Ensure the unit is properly plugged into a working wall outlet. If it is, try replacing the fuse in the unit.
N
Nicholas PhillipsAug 29, 2025
Why is my AirSep Oxygen Equipment outputting dust?
- C
  Cole WangAug 29, 2025
  If your AirSep Oxygen Equipment is outputting particulates (dusting), it could be due to excessive feed air pressure, a feed air regulator set above 485 kPa (70 psig), contaminated molecular sieve in adsorbers, or the system not cycling properly. Ensure the maximum feed air pressure does not exceed 1,035 kPa (150 psig) and adjust the feed air regulator.
U
urobinsonAug 31, 2025
What causes a loud chattering noise in the valve of AirSep AS-20 Oxygen Equipment?
- J
  Jonathan JordanAug 31, 2025
  A loud “chattering” noise in the valve of your AirSep Oxygen Equipment can be caused by low voltage, low voltage circuit board output, a dirty valve, a worn valve core, or a defective EMI filter. Check the power supply and replace the circuit board if necessary. You might also need to clean or rebuild the valve, or replace the EMI filter.
V
Victor HarveySep 2, 2025
Why does my AirSep AS-20 work, but the green light is off?
- D
  dennissherriSep 2, 2025
  If your AirSep Oxygen Equipment operates but the green light on the ON/OFF switch doesn't illuminate, the light bulb on the switch may be burned out, or there may be a loose or defective wire to the switch. Replace the switch or the bulb (in AS-160 – AS-1000 models). Alternatively, repair or replace the wire.
R
rachel33Sep 4, 2025
Why is the amber light off when my AirSep AS-20 cycles in MAN mode?
- G
  greenekaylaSep 4, 2025
  If your AirSep Oxygen Equipment cycles with the AUTO/MAN switch set to MAN but the amber light doesn't illuminate, it could be due to a burned-out bulb, a loose or defective wire, or a defective circuit board. Replace the switch or the bulb (in AS-160 – AS-1000 models), repair or replace the wire, or replace the circuit board.
J
joantownsendSep 6, 2025
What causes very low oxygen output in AirSep AS-20 Oxygen Equipment?
- P
  Patricia AndrewsSep 6, 2025
  Very low oxygen output (21–50%) in your AirSep Oxygen Equipment can be caused by leaking check valves, a plugged muffler, or contaminated molecular sieve in adsorbers. Try cleaning or replacing the check valves, replacing the muffler, or replacing the molecular sieve.
D
David WeissSep 8, 2025
Why are the relief valves opening on my AirSep Oxygen Equipment?
- C
  Caitlin WilliamsSep 8, 2025
  If the relief valves on your AirSep Oxygen Equipment are opening, it could be due to several reasons: the cycle pressure exceeding the maximum of 485 kPa (70 psig), a stuck or frozen feed air regulator main valve assembly, a defective cycle pressure gauge, or a defective relief valve. Adjust the feed air regulator, and if that doesn't work, rebuild or replace the regulator. Ensure the ambient temperature exceeds 4°C (40°F). Replace the gauge and adjust the feed air regulator if the gauge is defective. As a last resort, replace the relief valve.

AirSep AS-20 Specifications

General

Brand	AirSep
Model	AS-20
Category	Oxygen Equipment
Language	English

Summary

1.0 Introduction

1.1 General

Overview of the manual's scope, models covered, and recommendations for use.

1.2 Warnings, Cautions, and Notes

Explains safety symbols like WARNING, CAUTION, and NOTE used throughout the manual.

1.3 Symbols

Defines standard safety and electrical symbols used in the manual, referencing IEC and ISO standards.

1.4 References to Controls and Indicators with Tags or Labels

Explains how the manual refers to controls and indicators using uppercase characters and numbers.

2.0 Safety

2.1 General

Provides basic information about oxygen and general safety recommendations for its use.

2.2 Potential Hazards

Details specific hazards associated with oxygen, such as fire risk and electrical shock.

2.3 Safety Publications

Lists external publications for additional information on safe oxygen handling.

3.0 Plant Description

3.1 General

Describes the PSA technology and general operation of the oxygen generator.

4.0 Component Descriptions

4.1 External Components

Illustrates and describes the main external parts of the oxygen generator models.

4.2 Manifold Components

Illustrates and describes the manifold components, noting variations between models.

5.0 Installation

5.1 Handling and Unpacking

Provides step-by-step instructions for safely unpacking the oxygen generator unit.

5.2 Pre-installation Guidelines

Lists important guidelines for site preparation and environmental conditions before installation.

5.3 Installation Instructions

Details the recommended physical arrangement and connection steps for the oxygen generator.

6.0 Operation

6.1 Initial Start-up

Guides the user through the first-time start-up procedures, including power and feed air setup.

6.2 Operation

Explains how to operate the generator in auto or manual mode for different applications.

6.3 Shutdown

Provides procedures for safely shutting down the oxygen generator.

6.4 Normal Start-up

Outlines the steps for a standard start-up after a normal shutdown.

6.5 Extended Shutdown

Details procedures for shutting down the generator for 24 hours or longer.

6.6 Start-up after an Extended Shutdown

Describes how to restart the generator after a prolonged shutdown period.

7.0 Maintenance

7.1 Daily Monitoring

Specifies daily checks for the automatic drain valve and condensate discharge.

7.2 Monthly Monitoring

Outlines monthly checks for filters and drain valve performance, including filter bowl inspection.

7.3 Removing the Front Cover of the Enclosure

Provides instructions for safely removing the front cover for access to internal components.

7.4 Depressurizing the Filters

Details the safe procedure for depressurizing the filter assembly before maintenance.

7.5 Changing Filter Elements

Step-by-step guide for replacing particulate and coalescing filter elements.

7.6 Depressurizing the Oxygen Generator

Explains how to safely depressurize all oxygen generator components before maintenance.

7.7 Adjusting the Feed Air Regulator

Instructions for adjusting the feed air regulator to control pressure.

7.8 Adjusting the Pressure Switch

Guide to adjusting the pressure switch settings for proper operation.

8.0 Troubleshooting

Troubleshooting Guide

Lists common problems, their probable causes, and recommended solutions for the oxygen generator.

A Appendix Technical Data

Specifications

Provides detailed technical specifications for various AS models, including output, purity, and power requirements.

Operating Data

Contains operational data and parameters for the oxygen generator models.

Drawings

References various engineering and arrangement drawings for the oxygen generator models.

B Appendix Warranty/Returns

Product Warranty

Details the terms and conditions of the manufacturer's warranty for the oxygen generator.

Limits of Liability

Outlines the limitations of AirSep Corporation's liability regarding the product.

Returning the Oxygen Generator or a Component for Service

Provides instructions and requirements for returning the unit or parts for service or warranty claims.

C Appendix Parts List

AS-20 Parts

Lists spare parts and maintenance kits for the AS-20 model oxygen generator.

AS-45 Parts

Lists spare parts and maintenance kits for the AS-45 model oxygen generator.

AS-80 Parts

Lists spare parts and maintenance kits for the AS-80 model oxygen generator.

AS-160 Parts

Lists spare parts and maintenance kits for the AS-160 model oxygen generator.

AS-250 Parts

Lists spare parts and maintenance kits for the AS-250 model oxygen generator.

AS-450 Parts

Lists spare parts and maintenance kits for the AS-450 model oxygen generator.

AS-750 Parts

Lists spare parts and maintenance kits for the AS-750 model oxygen generator.

AS-1000 Parts

Lists spare parts and maintenance kits for the AS-1000 model oxygen generator.

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Table of Contents

Questions and Answers:

AirSep AS-20 Specifications

Summary

1.0 Introduction

1.1 General

1.2 Warnings, Cautions, and Notes

1.3 Symbols

1.4 References to Controls and Indicators with Tags or Labels

2.0 Safety

2.1 General

2.2 Potential Hazards

2.3 Safety Publications

3.0 Plant Description

3.1 General

4.0 Component Descriptions

4.1 External Components

4.2 Manifold Components

5.0 Installation

5.1 Handling and Unpacking

5.2 Pre-installation Guidelines

5.3 Installation Instructions

6.0 Operation

6.1 Initial Start-up

6.2 Operation

6.3 Shutdown

6.4 Normal Start-up

6.5 Extended Shutdown

6.6 Start-up after an Extended Shutdown

7.0 Maintenance

7.1 Daily Monitoring

7.2 Monthly Monitoring

7.3 Removing the Front Cover of the Enclosure

7.4 Depressurizing the Filters

7.5 Changing Filter Elements

7.6 Depressurizing the Oxygen Generator

7.7 Adjusting the Feed Air Regulator

7.8 Adjusting the Pressure Switch

8.0 Troubleshooting

Troubleshooting Guide

A Appendix Technical Data

Specifications

Operating Data

Drawings

B Appendix Warranty/Returns

Product Warranty

Limits of Liability

Returning the Oxygen Generator or a Component for Service

C Appendix Parts List

AS-20 Parts

AS-45 Parts

AS-80 Parts

AS-160 Parts

AS-250 Parts

AS-450 Parts

AS-750 Parts

AS-1000 Parts

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