Oxygen Concentrator
Service Manual

MN069-1
rev A

AirSep Corporation • 401 Creekside Drive • Buffalo, New York 14228-2085 USA
Telephone: (716) 691-0202 • 24 - Hour Fax (716) 691-4141

QuietLife Service Manual

Table of Contents
Section 1.0
Introduction

1.1
1.2
1.3
1.4
1.5
1.6
1.7

Equipment Provider Responsibility
Safety Guidelines and Important Notices
Safety Rules
QuietLife Product Warranty
How to Use this Service Manual
General Information
Functional Specifications

1-1
1-2
1-3
1-4
1-5
1-6
1-7

2.1
2.2

UnpackingOperation Check
2.2.1 Initial Check
2.2.2 Oxygen Purity Test
Conditions & Procedure for Returning a QuietLife Unit
Packing for Shipment

2-1
2-2
2-2
2-2
2-2
2-3

3.1
3.2

General Instructions
Routine Maintenance by the Patient
3.2.1 Cleaning the Air Intake Gross Particle Filter
3.2.2 Checking the Alarm System Battery

3-1
3-1
3-1
3-1

4.1
4.2
4.3

Description of Operation
Start-Up
Alarm System
4.3.1 Battery Test
4.3.2 Power Failure Alarm Test
4.3.3 High Pressure Alarm Test
4.3.4 Low Pressure Alarm Test
4.3.5 Oxygen Monitor Test
Operating Pressure Check

4-1
4-1
4-1
4-2
4-2
4-2
4-2
4-3
4-3

Section 2.0
Handling
Procedures

2.3
2.4

Section 3.0
Patient
Instructions

Section 4.0
Operation

4.4

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Section 5.0
Service

5.1
5.2
5.3

5.4
5.5

5.6

5.7

5.8

ii - table of contents

Compressor Assembly Replacement
5.1.1 Compressor Assembly Removal
5.1.2 Compressor Assembly Installation
Sieve Bed Replacement
5.2.1 Sieve Bed Removal
5.2.2 Sieve Bed Installation
Exhaust Muffler Replacement
5.3.1 Blowdown Assembly Removal
5.3.2 Muffler Removal
5.3.3 Muffler Installation
Capacitor Replacement
5.4.1 Capacitor Removal
5.4.2 Capacitor Installation
Blower Replacement
5.5.1 Shelf Assembly Removal
5.5.2 Blower Removal
5.5.3 Blower Installation
Transformer Replacement
5.6.1 Transformer Removal (Main PCB)
5.6.2 Transformer Installation (Main PCB)
5.6.3 Transformer Removal (Oxygen Monitor PCB)
5.6.4 Transformer Installation (Oxygen Monitor PCB)
Solenoid Valves
5.7.1 Feed or Waste Valve Rebuilding
5.7.2 Feed or Waste Valve Re-assembly
5.7.3 Equalization (EQ) Valve Rebuilding
5.7.4 Equalization (EQ) Valve Re-assembly
5.7.5 Solenoid Valve Coil Replacement
5.7.6 Valve Cleaning
Control Panel Assembly Replacement
5.8.1 Control Panel Assembly Removal
5.8.2 Control Panel Installation
5.8.3 Control Panel Main PCB Replacement
5.8.4 Control Panel Main PCB Removal
5.8.5 Control Panel Main PCB Installation
5.8.6 Hour Meter / O2 Alarm PCB Replacement
5.8.7 Hour Meter / O2 Alarm PCB Removal
5.8.8 Hour Meter / O2 Alarm PCB Installation
5.8.9 Circuit breaker Replacement
5.8.10 Circuit Breaker Removal

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5-1
5-2
5-3
5-3
5-3
5-4
5-4
5-4
5-4
5-5
5-5
5-5
5-5
5-6
5-7
5-7
5-7
5-7
5-8
5-8
5-8
5-8
5-9
5-9
5-9
5-10
5-10
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5-12
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5.9

5.11

5.8.11 Circuit Breaker Installation
5.8.12 Power (On/Off) Switch Replacement
5.8.13 Power Switch Removal
5.8.14 Power Switch Installation
5.8.15 Flow Selector Replacement
5.8.16 Flow Selector Removal
5.8.17 Flow Selector Installation
Main PCB Replacement
5.9.1
Main PCB Removal
5.9.2
Main PCB Installation
5.10
O2 Monitor PCB Replacement
5.10.1 O2 Monitor PCB Removal
5.10.2 O2 Monitor PCB Installation
Power Cord Replacement
5.11.1 Power Cord Removal
5.11.2 Power Cord Installation

5-13
5-13
5-13
5-13
5-14
5-14
5-14
5-14
5-15
5-15
5-15
5-15
5-16
5-16
5-16
5-17

Routine Maintenance6.2
Bacteria Filter Replacement
6.3
Compressor Intake Filter
6.3.2
Box Filter Replacement
6.3.3
Filter Capsule / Felt Cylinder Replacement
6.3.3.1 Felt Cylinder Replacement
6.3.3.2 Filter Capsule Replacement
6.4
Air Intake Gross Particle Filter
6.5
Battery Replacement

6-1
6-1
6-1
6-2
6-2
6-2
6-2
6-3
6-3

Section 6.0
Maintenance

6.1

Section 7.0
Troubleshooting

Appendix A♦ Process Schematic

A-1♦ Wiring Schematic

B-1♦ Classification♦ Symbols

C-1
C-2

Appendix B
Appendix C
Specifications

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List of illustrations

Appendix A
Figure A.1

QuietLife Basic Unit - Process Schematic

Appendix B
Figure B.1

i-List of illustrations

QuietLife Basic Unit - Wiring Schematic

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MN069-1
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QuietLife Service Manual

1.0 Introduction
1.1

Equipment Provider Responsibility
All Home Care Equipment Providers of the QuietLife Oxygen Concentrator must
assume responsibilities for handling, operational check-out, patient instruction,
maintenance, repair, and parts replacement. These responsibilities are outlined below andthroughout this manual.
QuietLife units must not be used for or with any life supporting
applications. Geriatric, pediatric, or any other patients unable tocommunicate discomfort while using this machine may require
additional monitoring. Advise patients to immediately notify theirEquipment Providers and / or physicians in case of an alarm or any
discomfort.
As an Equipment Provider, you must do all of the following:♦ Inspect the condition of each QuietLife unit immediately upon delivery to yourbusiness location. Note any sign of damage, external or internal, on the delivery
receipt, and report it directly to both the freight company and AirSep Corporation
immediately.
♦ Check the operation of each QuietLife before delivery to a patient. Always operate
the unit for a reasonable length of time (minimum 45 minutes), and check that theoxygen purity level is within specifications. (Test the alarm system as described in
Section 4.3 of this manual.)♦ Deliver QuietLife units only to patients authorized by a physician’s prescription. The
QuietLife must not be used as a life-supporting device. A backup supply of oxygenmust be available.
♦ Instruct patients to notify their physicians and / or Equipment Providers if theyexperience any signs of discomfort.
♦ Instruct each patient how to perform routine maintenance of the air intake grossparticle filter and how to check the alarm system battery. (Refer to Section 3.2.)♦ Perform and record routine maintenance every 90 days and in between patient’s use.
Replace the bacteria filter after every 10,000 hours.
♦ Perform a test of oxygen purity on the QuietLife every 90 days. (Refer to Section
2.2.2.)♦ Be available to service each patient at any time.
♦ Repair components and replace parts only as outlined in this manual. Use only
AirSep parts for replacement in the QuietLife Oxygen Concentrators.
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QuietLife Service Manual♦ Refer to the QuietLife Product Warranty if parts replacement is required within thewarranty period.
♦ Return a QuietLife unit ONLY as described in the “Conditions and Procedure for
Returning a QuietLife” section of this manual. (Refer to Section 2.3)

1.2

Safety Guidelines and Important Notices
To ensure safe operation and proper unit maintenance, AirSep Corporation recommends
that you keep this service manual readily available for reference.
As you read the manual, pay special attention to the WARNING, CAUTION, and NOTE
messages. They identify safety guidelines or other important information as follows:
Describes a hazard or unsafe practice that can result in severe bodily
injury or death.

Describes a hazard or unsafe practice that can result in minor bodily
injury or property damage.

Provides information important enough to emphasize or repeat

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1.3

Safety Rules
Carefully review and familiarize yourself with the following important safety information
about the QuietLife Oxygen Concentrator.
This device manufactures high purity oxygen, which promotes rapid
burning. Allow no smoking by anyone (including the patient) or any open
flames within five feet of this device or the oxygen carrying tubing. Useno oil, grease, or petroleum-based products on or near the unit. Disconnect
the power cord before you clean or service it.

Electrical shock hazard. Do not remove covers while the unit is plugged
in. Allow only a qualified service technician to remove the covers. Do notuse extension cords with this unit.

The unit should be located so as to avoid pollutants or fumes.

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1.4 QuietLife Product Warranty
AirSep Corporation (“AirSep”) to the party purchasing from AirSep (the “original
purchaser”) the QuietLife Oxygen Concentrator unit to be free from defect in parts andworkmanship for two years from the date of shipment to the original purchaser undernormal use, maintenance and operation. TO THE EXTENT PERMITTED UNDERAPPLICABLE LAW, ALL WARRANTIES WITH RESPECT TO SUCH UNIT SHALLONLY EXTEND TO AND BE FOR THE BENEFIT OF THE ORIGINAL
PURCHASER AND SHALL NOT BE ASSIGNABLE TO, EXTEND TO OR BE FOR
THE BENEFIT OF ANY OTHER PARTY. AirSep’s obligations under this warranty
are limited, at AirSep’s option, to the repair, replacement or refunding the purchase priceof any such unit of equipment (or part thereof) found by AirSep to be defective in parts orworkmanship; provided, however, that AirSep shall have no obligation hereunder withrespect to a defective part unless it receives written notice of such defect prior to the
expiration of the applicable warranty period as referenced above.
Each unit of equipment for which a warranty claim is asserted shall, at the requestof AirSep, be returned on a prepaid basis with proof of purchase date to the AirSep
factory specified by AirSep at the expense of the original purchaser. Replacement parts
shall be warranted as stated above for the unexpired portion of the original warranty.
This warranty does not extend to any unit or part subjected to misuse, accident, improper
maintenance or application, or which has been repaired or altered outside of the AirSep
factory without the express prior written authorization of AirSep.
THE FOREGOING WARRANTY IS THE ONLY WARRANTY MADE BY
AIRSEP WITH RESPECT TO THE EQUIPMENT (OR ANY PART THEREOF) AND
IS IN LIEU OF ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, IN FACTOR IN LAW, INCLUDING WITHOUT LIMITATION ANY WARRANTIES OF
MERCHANTABILITY OR THE FITNESS FOR ANY PARTICULAR PURPOSE. IT
IS EXPRESSLY UNDERSTOOD THAT THE SOLE AND EXCLUSIVE REMEDY
FOR ANY DEFECT IN PARTS OR WORKMANSHIP IS LIMITED TO
ENFORCEMENT OF AIRSEP’S OBLIGATIONS AS SET FORTH ABOVE, AND
AIRSEP SHALL NOT BE LIABLE TO ORIGINAL PURCHASER OR ANY OTHERPARTY FOR LOSS OF USE OF THE EQUIPMENT, LOST PROFITS OR FOR ANYOTHER SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES(EVEN IF AIRSEP HAS BEEN ADVISED OF THE POSSIBILITY OF SUCHDAMAGES).
Notwithstanding anything to the contrary contained herein, during the applicablewarranty period, as specified above, AirSep will pay the cost of return freight charges tothe original purchaser for any equipment found by AirSep to be defective. For warranty
repairs performed during the first 90 days from the date of invoice, AirSep will pay
freight both ways. After the applicable parts warranty has expired, the original purchaser
is responsible for freight both ways.

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1.5

How to Use this Service ManualThis manual specifically details for you, the Equipment Provider, the procedures toservice the AirSep QuietLife Oxygen Concentrator.
This manual provides instruction for Equipment Providers only. This is
not a manual for QuietLife patient use. Provide patients with the QuietLife
Patient Manual.
To prevent unauthorized use, do not leave your QuietLife Service Manualor any reproduced pages at the patient location.
This manual includes complete sections in the following areas:
Introduction……………………………………………………(1.0)
Handling Procedures…………………………………………..(2.0)
Returning the QuietLife for Factory Service (RGA)………….(2.3)
Maintenance Performed by the Patient………………………..(3.2)
Operation of the QuietLife…………………………………….(4.0)
Service…………………………………………………………(5.0)
Maintenance Performed by the Equipment Provider………….(6.0)
Troubleshooting………………………………………………..(7.0)

All section titles and subject subtitles are listed in the Table of Contents on the first pagesof this manual. A separate troubleshooting chart is located in the last section of thismanual.
Appendix A provides a process schematic.
Appendix B includes a wiring schematic for your reference.
Appendix C provides CSA-approved specifications for the QuietLife Oxygen
Concentrator and a list of symbols referenced on the unit.
When requesting parts or service, provide the unit’s model, serial number,hour meter reading, oxygen purity level, and operating pressure. Check
that all part numbers are listed correctly. Complete and accurate
information helps to expedite your request.

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QuietLife Service Manual

1.6

General Information
This manual provides the information needed by Equipment Providers to performperiodic maintenance, to repair components, and to replace parts of the QuietLife Oxygen
Concentrator. The QuietLife Oxygen Concentrator is a self-contained air separation
device that can supply up to 3 liters per minute (lpm) of high purity oxygen. This device
is intended for use by patients who require supplemental oxygen therapy as prescribed bytheir physicians.
The QuietLife unit uses a pressure swing adsorption (PSA) process to separate oxygenfrom room air. This process uses two sieve beds (canisters) filled with a molecular sievematerial called zeolite. As room air enters the first sieve bed, the nitrogen in the air
attaches (adsorbs) to the zeolite while the oxygen passes freely through the material andout of the bed for the patient’s use. When the bed reaches it capacity to hold nitrogen ,the process switches to the other bed, while the first bed is purged (cleaned) of thenitrogen. One bed makes oxygen while the other bed is purged of the nitrogen for the
next cycle. The sieve material is completely regenerative and lasts indefinitely undernormal conditions.
The design of the QuietLife Oxygen Concentrator allows for home patienttherapy under the direction of a qualified , licensed physician. An alternate
source of oxygen must be available if a power failure or equipment
malfunction occurs. Instruct the patients to consult their physicians orEquipment Providers for the type of backup system required.

This unit must not be used for or with any life-support applications.
Geriatric, pediatric, or any other patients unable to communicate
discomfort while using this machine may require additional monitoring.
Advise patients to immediately notify their Equipment Providers and / orphysicians in case of an alarm or any discomfort.

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1.7

Functional Specifications
The following table lists the specifications for the QuietLife.
Oxygen Concentration:∗
Flow (LPM)
0.25 - 1.0
1.5 - 3.0
Dimensions:16.5 in. deep (419 mm)
13.62 in. wide (346 mm)
26.42 in. high (6671 mm)

Weight:78 lbs. (34.5 KG)

Sound Level:

41 dBA or less (AS047-1)
40 dBA or less (AS047-2)

Voltage:

120 VAC, 60 Hz (AS047-1).
220 - 230 VAC, 50 Hz (AS047-2).

Power:

360 Watts maximum (AS047-1)
280 Watts maximum (AS047-2)

Response Time:

5 minutes to obtain maximum purity following initial startup or after an extended shut-down.

Alarms:Power failure
Low Purity (85% ± 3%)
Low Pressure (5 psig ± 2 PSIG)High Pressure (40 psig ± 2 PSIG)

Flow Rate:

3 lpm ± 0.15 lpm
0.25 - 2.5 lpm ± 10%

Maximum Outlet Pressure:

6.0 psig +/- 10%

Positioning:

Locate the back of the unit a minimum of 12 inches fromthe wall and clear of any obstruction. Operate the unit in an
upright position.

Operating Temperature
Range:
AirSep Corporation
MN069-1
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Oxygen Concentration(% O2)
90 +/- 3
90 +/- 3

55°F (13°C) -100°F (38°C)
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QuietLife Service Manual

Storage Temperature Range: 45°F (7°C) – 120°F (49°C)*Based on an atmospheric pressure of 14.7 PSIA at 70°F (21°C.)

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2.0 Handling Procedures
2.1

Unpacking1)

Open and inspect all cartons (that contain units) upon delivery. If the exterior of aunit’s carton is damaged, note it on the freight bill signed by the driver.
2) Unpack the unit at once. To remove the concentrator from it carton, lift the box up
and over the top of the unit. Once the outer box is removed the concentrator must be
lifted and the bottom carton removed.
3) Inspect the cabinet exterior thoroughly for damage.
4) Remove the cabinet cover and inspect the interior for damage.
5) If you find any concealed damage, do not discard the shipping carton. Call the freightcompany who made the delivery, and file a concealed damage claim.
6) Remove the 7 flat head screws from the side compartment cover and separate thecover from the chassis.
7) Inspect the inside of the compartment for shipping damage.
8) Cut and remove the two straps around the compressor. The straps may be removedby pulling them from underneath the compressor tray.
9) Remove the two foam blocks located below the compressor (save for later use).
10) Plug the two pin connector from he compressor into the connector from the shelf.
Once connected, the wires and connector should be routed behind the tubing that runs
along the side of the compressor.
11) Replace the compartment cover and tighten the 7 flat head screws to a maximum of 5
in-lb.
Over tightening of the screws will cause damage to the compressor
compartment cover.
12) Slide the cabinet cover over the chassis of the unit. Do not force the cover over the
chassis, if there is resistance, check for obstructions in the cover path. Tighten the 4
screws (with washers) to a maximum of 10 in-lb.
13) The unit is now ready for operation.
When the QuietLife unit is being transported by any means other than its
own casters, the compressor must be supported by the two foam blocks thatwere removed in step 9. Once the unit reaches its destination, the foam
blocks should be removed. Failure to adhere to this procedure may result indamage to the unit that will not be covered by the warranty.

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2.2

Operation Check
AirSep tests every QuietLife thoroughly after manufacture. You must perform thefollowing test to ensure that no damage occurred in shipping or handling.

2.2.1

Initial Check
1) Plug in the power cord of the unit, and set the ON/OFF switch to the ON position.
Check to see if the following occurs:a) The red alarm light and a continuous alarm sounds for approximately 5
seconds.
b) Oxygen monitor lamp will illuminate until the O2 purity rises above 85% ±3% and then it will turn off.
c) The green Power ON lamp will remain illuminated while the ON/OFF switch
is in the ON position.
* If any of the items listed above do not occur, refer to the troubleshooting section of thismanual.

2) Turn the flow selector dial to the 3 lpm setting.
3) Perform an oxygen purity test as described in the next section of this manual.
2.2.2 Oxygen Purity Test
To ensure that the unit’s output of oxygen is within specification, you must perform an
oxygen purity test regularly. Test the unit upon delivery to a patient and at periodic
intervals (at least every 90 days).
1) If an oxygen humidifier bottle is used, remove it from the oxygen outlet.
2) Attach a calibrated oxygen purity analyzer to the oxygen outlet.
3) Set the product flow rate to 3 lpm or to the rate that matches the patient’sprescription.
4) Set the unit’s ON/OFF power switch in the ON position (it takes approximately
five minutes for the oxygen purity to stabilize). Take an oxygen purity reading.
If the purity reading is not within specification, refer to the troubleshooting
section of this manual.
5) Disconnect the oxygen analyzer, and reconnect the humidifier bottle if used.
6) Adjust the flow selector knob to the prescribed level.
2.3

Conditions & Procedure for Returning a QuietLife Unit.
If you need to return a unit for repair, you must obtain PRIOR APPROVAL, in the formof a Return Goods Authorization (RGA) number from AirSep Corporation.

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Write the RGA number clearly on the outside of the shipping carton. To obtain an RGA
number , call either the Customer or Technical Service Department at (716) 691-0202
with the serial number and hour meter reading on the unit.

♦ Return each QuietLife unit in its original packaging.
♦ Be certain to insure merchandise, and properly pack it for shipping. AirSep
assumes no responsibility for damage that occurs in transit.
♦ UPS returns of a QuietLife unit must have a minimum of $2,000 in declaredvalue.
♦ You must prepay shipping charges on all returns.

Do not return any unit to AirSep without an RGA. AirSep refuses any
unauthorized returns.

If you need to call for service assistance, have the Model, Serial Number,
Hour Meter Reading, Oxygen Purity Level, and Operating Pressures readily
available
2.4

Packing for Shipment
It is very important to properly pack the QuietLife unit for shipment. This helps toprevent shipping damage. Follow the steps below:
1) Remove the humidifier bottle if attached.
2) Wrap the power cord onto the power cord holders on the back of the unit.
3) Place the two foam blocks between the compressor and compressor plate.
4) Be sure the compressor compartment cover and outside cover are fastened.
5) Place the unit on the original bottom insert, make sure the casters and exhaust duct fit
into the holes in the insert.
When the four casters and exhaust duct line up with the cutout section of thebottom insert, the unit is in the box properly.

6) Place the plastic shipping bag over unit.

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7) Place the top insert on the unit. Place the original shipping carton over the top of theunit.
8) Use two banding straps around the outer carton and bottom inserts to secure thecarton.
9) Write the Return Goods Authorization (RGA) number on the outside of the shipping
carton.

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3.0 Patient Instructions
3.1

General Instructions
It is important that patients thoroughly understand how to operate the AirSep QuietLife
unit. This enables proper treatment as prescribed by a qualified, licensed physician. You
must explain that the purpose of this therapy is to alleviate symptoms. If patients
experience any discomfort or the unit alarms, they must notify their Equipment Provider
and / or physician immediately.
You, as the Equipment Provider, are responsible to see that each patient receives thePatient Manual. Explain each step in the operation of the unit to the patient in reference
to this manual.

3.2

Routine Maintenance by the Patient
To ensure accurate output and efficient operation of the unit, the patient must perform
two simple routine maintenance tasks:♦ Clean the air intake gross particle filter♦ Check the alarm system battery
3.2.1 Cleaning the Air Intake Gross Particle Filter
The patient must clean this filter weekly, as described below. The filter may
require daily cleaning if the QuietLife unit operates in a harsh environment
such as a house heated by wood, kerosene, or one with excessive cigarettesmoke.
Remove the dirty filter from the filter holder, and wash it in a warm solution ofsoap and water.
1) Rinse the filter thoroughly, and remove excess water with a soft absorbent
towel.
2) Replace the filter.
3.2.2 Checking the Alarm System Battery
The alarm system battery is tested each time the ON/OFF switch is set to the ON
position. A continuous alarm sounds for approximately five seconds to indicate agood battery. If the alarm sounds weak, or no alarm sounds at all, instruct thepatient to call the Equipment Provider immediately. Refer to section 6.5 for thebattery replacement procedure.

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4.0 Operation
4.1

Description of Operation
The process schematic (appendix A) shows the normal flow of air through the
QuietLife Oxygen Concentrator. Air is drawn into the QuietLife cabinet through anexternal air intake gross particle filter. Before this air enters the compressor it is filteredonce again by an additional filter. Pressurized air then exits the compressor and passes
through a heat exchanger. The heat exchanger reduces the temperature of thecompressed air. Next, a two-way solenoid feed valve directs the air into one of the twosieve beds that contain molecular sieve. The unique property of molecular sieve enables
it to physically attract (adsorb) nitrogen when air passes through this material, thus
producing high purity oxygen.
There are two sieve beds: while one produces high purity oxygen, the other is purgedof the nitrogen it adsorbed (collected) while it made oxygen. Each adsorber produces
oxygen for approximately 7 seconds and delivers it to the mixing tank. Oxygen exits the
mixing tank through two pressure regulators, bacteria filter and flow control valve. The
flow control valve controls the amount of oxygen delivered to the patient. The QuietLife
unit can deliver up to 95% pure oxygen at flow rates from 0.25 - 3 lpm.

4.2 Start-Up
The QuietLife Oxygen Concentrator accepts household electrical power.
1) Uncoil the power cord completely from its holder before use, and plug in the unit.
2) Set the ON/OFF switch to the ON position, and observe the following:♦ The green light on the front panel will light.
♦ The audible alarm sounds loudly for approximately 5 seconds. This indicatesthe battery for the alarm is good.
♦ The red alarm light will remain on for approximately 5 seconds.
♦ The Oxygen Monitor’s Alarm light remains on until the oxygen purity reaches
85% ± 3% (approximately two minutes)♦

4.3 Alarm System
The QuietLife Oxygen Concentrator is equipped with a battery-powered alarm system,
which sounds a continuos and loud alarm when a power failure occurs. It sounds anintermittent alarm if the high or low pressure switches are activated or if the oxygen
monitor detects lower than therapeutic levels of oxygen purity. The alarm remains ON
until you correct the alarm condition or you set the ON/OFF switch to the OFF position.
Refer to section 7.0 for a list of probable alarm causes

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4.3.1 Battery Test
When the QuietLife unit is turned ON, an audible alarm sounds for 5 seconds to indicate
the condition of the battery.

The audio alarm must sound loudly for approximately five seconds when theunit is turned ON to indicate the battery is in good condition.

4.3.2 Power Failure Alarm Test
To test the power failure alarm, take the following step:
Unplug the unit, and set the ON/OFF switch to the ON position.
This should immediately activate the audio alarm. If it does not, refer to thetroubleshooting chart in Section 7.0 of this manual.

4.3.3 High Pressure Alarm Test
1) Remove the orange plug and connect a pressure gauge (0-60 psig.) to the test port
located on the top deck of the concentrator.
2) Remove the connector with the brown wire from the left rear terminal on the valve
block.
3) Turn the concentrator ON.
4) Observe the pressure gauge and record the point that the concentrator alarms. Thisvalue should be within the acceptable limit of 38 - 42 psig for the High Pressure
Alarm.
5) Turn the unit’s ON/OFF switch to the OFF position and replace the brown wire thatwas removed from the valve block.

4.3.4 Low Pressure Alarm Test
1) Remove the orange plug from the pressure test port and connect a pressure gauge (060 psig).
2) Remove the 7 flat head screws from the compartment cover and separate the coverform the chassis.
3) Remove the 1/8” OD tubing from the connector on the front of the valve block.
4) Turn the unit’s ON/OFF switch to the ON position.

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5) An alarm should continually sound. Slowly insert the 1/8”OD tubing back into theconnector on the front of the valve block while watching the pressure gauge. The
alarm should stop when the pressure rises above 5 psig ± 2 psig.
6) Turn the unit’s ON/OFF switch to the OFF position and replace the tubing on thefront of the valve block.
7) Replace the compartment cover and tighten the 7 flat head screws to a maximum of 5
in-lb.
Over tightening of the screws will cause damage to the compartment cover.

4.3.5 Oxygen Monitor Test
A test may be performed to verify the operation and “set point” of the oxygen monitor.
1) Connect a tube from the oxygen outlet on the front of the concentrator to an oxygen
analyzer.
2) Turn the concentrator ON and set the flow rate to 3 lpm.
3) The O2 “Alarm” light should be on a this point.
4) Once the oxygen purity of the concentrator is above 85% ± 3% the O2 alarm lightshould go out.
5) Remove the connector with the purple wire from the terminal of the EQ valvesolenoid. The oxygen purity will slowly begin to drop, as the purity drops observe
the O2 alarm light, it should illuminate when the oxygen purity drips below 85% ±3%.
6) After 15 minutes an audible alarm should sound.
7) Turn the concentrator OFF and replace the connector removed from the EQ valve.
∗If any of the items listed above do not occur, refer to the troubleshooting section of this manual.

4.4

Operating Pressure Check
1) Remove the orange plug from the pressure test port and connect a pressure gauge (060 psig).
2) Turn the unit’s ON/OFF switch to the ON position.
3) Turn the flow selector the 3 lpm setting.
4) Allow the unit to run for a minimum of 5 minutes.
5) The maximum operating pressure can be determined when the pressure gauge it at its
highest point.
6) The minimum operating pressure will be when the pressure gauge is at its lowest
point.

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Maximum operating pressure range is typically between 23 - 27 psig.
Minimum operating pressure range is typically between 11 - 14 psig.

7) Turn the unit’s ON/OFF switch to the OFF position.
8) Remove the pressure gauge from the pressure test port and replace the plug.
∗If any of the items listed above do not occur, refer to the troubleshooting section of this manual.

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5.0

Service
5.1

Compressor
The compressor is the “pump” within the oxygen concentrator that pushes the room air
into the bottom of the sieve beds. This allows oxygen to flow out of the top.
Two different aspects of the compressor cause concern: the output and the sound level.

♦ Output
Compressor output refers to how much compressed air the compressor can
produce. The model of the compressor, the stroke of the piston, and thecondition of the cup seals determine this. The QuietLife uses a twin piston
compressor with a .38” stroke. Stroke refers to how far the piston moves. In
the QuietLife unit, the piston moves only 38/100 of an inch, requiring lesselectricity to operate than other comparable models.
The cup seals form the seal between the piston and the cylinder wall. As thecup seals wear, the compressor’s output begins to gradually decrease. This
reduction in compressor output results in less air for the sieve beds. Therefore,
the production of oxygen decreases.
This drop in oxygen production occurs over a long time period. You candetect it first at 3 lpm, then 2.5 lpm, then 2.0 lpm, etc. You can continue apatients therapy on the QuietLife unit as long as that unit’s oxygen purity
level at the prescribed liter flow rate meets AirSep’s specifications (90% ±3%).

♦ Sound Level
The condition of the compressor’s bearings mainly determine it sound level.
There are four bearings located within the compressor that allow the innercomponents of the compressor to rotate. These sealed bearings are sensitive tohigh temperatures, which can cause the lubricant to leak out. If the bearings
wear to the point that they become noisy, the compressor becomes noticeably
loud and needs servicing.
5.1.1 Compressor Assembly Removal
To remove the compressor assembly for exchange, follow the steps listed below:
1) Set the unit’s ON/OFF switch to the OFF position, and unplug the power cord.
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2) Remove the cover (4 screws) and side panel (7 screws).
3) Disconnect the suction tube from the compressor by simultaneously pushing up on
the release ring on the compressor fitting and pulling down on the tubing.
4) Disconnect the white 2 pin power connector that runs between the compressor andshelf assembly.
5) Remove the protective rubber boot the covers the two capacitor leads.
With the unit turned OFF and unplugged, simultaneously touch both spadesof the capacitor with an insulated screwdriver as a precaution to eliminate
any charge the capacitor may be storing.
6) Disconnect the two leads to the capacitor.
7) Disconnect the exhaust tubing that runs between the compressor and the valve blockby pushing up on the release ring on the fitting and simultaneously pulling down on
the tubing. The valve block may be lifted slightly to obtain better access to the releasering on the fitting.
8) Slide the compressor assembly out of the unit.
5.1.2 Compressor Assembly Replacement
To install the compressor assembly, follow the steps listed below:
1) Perform the compressor removal procedure in reverse order.
2) Make sure the compressor lead wires are secured to the wire clip and not touching thecompressor.

The compressor should move freely and should not contact the interior wallsof the unit. Any contact may cause excessive noise or vibration.
Leak test all fittings on the compressor and the connection point where the compressor
exhaust tubing connects with the valve block. To check for leak, take the following steps.
a) Uncoil the power cord from its holder and plug in the unit.
b) Set the unit’s ON/OFF switch to ON for three minutes with the flow selector
set to “0” to pressurize the system.
c) Set the unit’s ON/OFF switch to OFF, and unplug the power cord.
d) Using a small brush, apply soapy water around the valve block connection
point and check for leaks. The valve block may be lifted slightly to allow
better access to the fitting.

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5.2

Sieve Bed Replacement
Do not expose molecular sieve (contents of bed) to air for an extended periodof time. Prolonged exposure of molecular sieve to the moisture in room air
results in contamination and permanent damage to the sieve material. Keepall openings to the sieve beds sealed.

If replacement is necessary, you must replace both sieve beds at the sametime.

5.2.1 Sieve Bed Removal
1) Set the unit’s ON/OFF switch in the OFF position, and unplug the power
cord.
2) Remove the outside cover from the unit.
3) Cut the green tie-wraps at the brass “T” fittings on the top of the beds, anddisconnect the green ¼-inch product and equalization tubes.
4) Remove the black 5/16-inch tube from the bottom of each sieve bed.
5) Cut the black tie-wraps, and remove the sieve beds.
6) Plug the opening on the top and bottom of the sieve beds.
5.2.2 Sieve Bed Installation
To install the sieve beds, follow the sieve bed removal procedure in reverse order.
It is very important to tighten all tubes to eliminate leaks. However, do not overtighten.
To check for leaks, take the following steps:
1) Uncoil the power cord completely from its holder before use, and plug in theunit.
2) Set the unit’s ON/OFF switch to ON for three minutes with the flow selector
set at “0”.
3) Set the unit’s ON/OFF switch to OFF, and unplug the power cord.
4) Using a small brush, carefully apply soapy water around the sieve bed tube
connections, and check for leaks.
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Leaks can be so small in air loss that purity is not affected immediately. The
sieve material can become contaminated gradually. Careful leak testing isimportant.

5.3

Exhaust Muffler Replacement
The QuietLife uses two plastic sintered mufflers to help suppress the noise generated
during the blow down step of the PSA cycle. The two mufflers are located inside of theblowdown muffler assembly. To remove the mufflers the compressor assembly must be
removed to gain access to the blowdown muffler assembly. Remove the compressor
according to the compressor assembly removal procedure.

If replacement is necessary, you should replace both mufflers at the sametime.
5.3.1 Blowdown Assembly Removal
1) Remove the 8-32 hex kep nut that secures the blowdown muffler assembly tothe cabinet shelf.
2) Separate the blowdown from the cabinet by disconnecting the black 5/16-inch

tube from the blowdown assembly.
5.3.2 Muffler Removal
1) Remove the 8-32 screw and nut from the blowdown assembly.
2) Remove the aluminum screen and felt cylinder.
3) The two white plastic mufflers can be removed individually by unscrewing
them from the exhaust manifold.
5.3.3 Muffler Installation
To install the plastic mufflers, follow the muffler removal procedure in reverse
order. Each muffler can be installed and tightened by hand. It is very importantto tighten each muffler completely. Replace the blowdown and compressor
assembly by following their removal procedures in reverse order.

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5.4

Capacitor Replacement
The capacitor starts the compressor. If the compressor will not start, the capacitor
may be defective and require replacement.
To replace the capacitor, take the following steps:
5.4.1 Capacitor Removal
1) Set the unit’s ON/OFF switch in the OFF position, and unplug the power
cord.
2) Remove the outside cover from the unit.
3) Remove the inside cover (7 screws) from the unit to expose the compressor
and shelf assembly.
4) Remove the rubber boot that covers the two capacitor leads.

With the unit turned OFF and unplugged , simultaneously touch bothterminals of the capacitor with an insulated screwdriver as a precaution toeliminate any charge the capacitor may be storing.
5) Remove the compressor assembly according to the compressor assembly
removal procedure.
6) Loosen the 6-32 hex nuts that hold the two capacitor clamps in place.
7) Slide the capacitor out of the clamps.
5.4.2 Capacitor Installation
To install the capacitor, follow the capacitor removal procedure in reverse order.

5.5

Blower Replacement
The blower is used to circulate air within the cabinet for cooling purposes and consists of
two parts; the blower/motor and the blower capacitor. The shelf assembly must be
removed to obtain access to the blower components.

If replacement is necessary, you should replace the blower / Motor and theblower capacitor.
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5.5.1 Shelf Assembly Removal
1) Set the unit’s ON/OFF switch in the OFF position, and unplug the power
cord.
2) Remove the outside cover from the unit.
3) Remove the inside cover (7 screws) from the unit to expose the shelfassembly.
4) Disconnect the two pin connector from the compressor assembly.
5) Disconnect from the terminal block on the shelf the black wire from the top
deck.
6) Disconnect from the terminal block on the shelf the white wire from the top
deck.
7) Remove the 5/16-inch tube from the bottom of each sieve bed.
Do not expose molecular sieve (contents of bed) to air for an extended periodof time. Prolonged exposure of molecular sieve to the moisture in room air
results in contamination and permanent damage to the sieve material. Keepall openings to the sieve beds sealed.
8) Plug the opening on the bottom of each sieve bed.
9) Disconnect the exhaust tubing that runs between the compressor and the valve
block by pushing up on the release ring on the fitting and simultaneously
pulling down on the tubing. The valve block may be lifted slightly to obtainbetter access to the release ring on the fitting.
10) Remove the rubber boot that covers the two capacitor leads.
With an insulated screwdriver, simultaneously touch both terminals of thecapacitor as a precaution to eliminate any possible charge the capacitor may
be storing.
11) Disconnect the two leads to the capacitor.
12) Slide the shelf assembly approximately half way out of the cabinet.
13) Remove the two 5/16-inch tubes from the fittings on the side of the valve
block assembly.
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14) Remove the eight connectors from the valve solenoids, note the position ofeach wire.
15) Remove the shelf assembly from the cabinet.

5.5.2 Blower Removal
1)
2)
3)
4)

Disconnect the two wires that run from the blower to the terminal block. Notethe position of each wire.
Loosen the screw on the top of the blower bracket until the blower / motor canbe removed.
Remove the screw holding the blower capacitor.
Separate the blower/motor and capacitor from the shelf.

5.5.3 Blower Installation
To install the blower, follow the blower removal procedure in reverse. Replace
the shelf assembly by performing the shelf assembly removal procedure in
reverse.

5.6

Transformer Replacement
There are two transformers used on the QuietLife unit, one is used for the main PCB andthe other is used for the oxygen monitor PCB.
5.6.1 Transformer Removal (Main PCB)The main PCB transformer is located next to the main PCB and has a 3-pin
connector.
1) Set the unit’s ON/OFF switch in the OFF position, and unplug the power
cord.
2) Remove the outside cover from the unit.
3) Disconnect the three pin connector from the main PCB.
4) Disconnect the two transformer wires from the terminal strip “Terminal 2”.

The 250V transformer will have orange and white wires on the primary side.
The 120V transformer has two black wires.

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5) Remove the two screws that attach the transformer to the cabinet.
6) Separate the transformer from the cabinet.

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5.6.2 Transformer Installation (Main PCB)
To install the main PCB transformer , follow the transformer removal procedurein reverse order.
5.6.3 Transformer Removal (Oxygen Monitor PCB)The oxygen monitor transformer is located next to the oxygen monitor PCB andhas a 6-pin connector.
1)
2)
3)
4)
5)
6)
7)
8)

Set the unit’s ON/OFF switch in the OFF position, and unplug the power
cord.
Remove the outside cover from the unit.
Disconnect the 6-pin connector from the oxygen monitor PCB.
Disconnect the 3-pin connector from the main PCB (J5).
Remove all tie wraps that secure the transformer wires to other wire
harnesses.
Disconnect the two transformer wires from the terminal strip “Terminal
2”. Cut the black and white wire as close to the 0.250 connectors as
possible.
Remove the two screws that attach the transformer to the cabinet.
Separate the transformer from the cabinet.

5.6.4 Transformer Installation (Oxygen Monitor PCB)
To install the main PCB transformer, follow the removal procedure in reverse
order. Crimp one of the two wires from the primary side of the transformer
together in a 0.250 connector with the white wire from the main PCB. The otherwire from the primary side of the transformer should be crimped together with theblack wire from the main PCB in a 0.250 connector.
The 250V transformer will have orange and white wires on the primary side.
The 120V transformer has two black wires.

5.7

Solenoid Valves
The QuietLife uses 5 two-way solenoid valves: two feed, two waste, and one
equalization. Each valve has an open (energized) and closed (de-energized) position. As
the QuietLife operates, a minimum of two valves are always energized.

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The solenoid valves of the QuietLife unit require no scheduled maintenance. If a valve
becomes noisy, you can easily replace the internal valve parts. To identify the noisy
valve, observe which green circuit board light illuminates at the time of the noise. The
lighting matrix on the circuit board is labeled with letters that designates each valve(“LF” = Left Feed).
The left and right feed and waste valves may be determined by viewing thevalve block with the units inside cover removed. The valves located on thefront of the valve block are the feed valves and the valves on the back of thevalve block are the waste valves. The left feed valve is located on theleft/front side of the valve block.
5.7.1 Feed or Waste Valve Rebuilding
1) Remove the shelf assembly according the shelf assembly removal procedure.
2) Remove the red cap from the appropriate valve with a slotted headscrewdriver.
3) Lift off the solenoid coil.
4) Loosen and remove the solenoid base with a one-inch deep well socket. Notethe direction the spring is facing.
5) Install the rebuild kit, which contains all parts of the solenoid assembly except
the solenoid coil.
5.7.2 Feed or Waste Valve Re-assembly
To reassemble the feed or waste valves, follow the feed or waste valve rebuilding
procedure in reverse order, and test for leaks.

Correct direction of the spring is required for proper valve function.

5.7.3 Equalization (EQ) Valve Rebuilding
1) Set the unit’s ON/OFF switch to the OFF position, and unplug the power
cord.
2) Remove the outside cover from the unit.
3) Remove the red cap from the EQ valve with a slotted-head screwdriver.
4) Lift off the solenoid coil.
5) Secure the EQ plate with pliers or channel locks.

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6) Loosen and remove the solenoid base with an 8-inch adjustable wrench.
Install the rebuild kit, which contains all parts of the solenoid valve assembly
except the solenoid coil.
5.7.4 Equalization (EQ) Valve Re-assembly
To reassemble the EQ valve, follow the EQ valve rebuilding procedure in reverse
order, and test for leaks.
5.7.5 Solenoid Valve Coil Replacement
If a solenoid valve coil does not operate, its corresponding green light on thecircuit board does not illuminate.
1) Set the unit’s ON/OFF switch to the OFF position, and unplug the power
cord.
2) Remove the outside cover from the unit.
If replacing the Feed or Waste solenoids, it will be necessary to remove theshelf assembly according to the shelf assembly removal procedure.
3) Remove the red cap with a slotted-head screwdriver.
4) Disconnect the solenoid leads, and lift off the solenoid coil.
5) Replace with the new coil.
6) Press the red cap back on tip of the coil, and reconnect the solenoid leads.
5.7.6 Valve Cleaning
Clean any of the feed or waste valves by removing the valve from the valve blockassembly, as described in Section 5.7.1. Then firmly tap it on a hard surface suchas a table to dislodge any debris that may be inside the solenoid valve body.

5.8

Control Panel Assembly Replacement
5.8.1 Control Panel Assembly Removal
1) Set the unit’s On/Off switch in the OFF position, and unplug the power cord.
2) Remove the outside cover from the unit.
3) Disconnect the tubing connected to the flow selector
4) Remove tie wraps that secure the wires together from the control panel5) Disconnect the Brown or Black wire that connects the power cord to thecircuit breaker.
6) Disconnect the back wire that runs from the On/Off switch to “Terminal 1”.

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7) Disconnect the 7 pin connector that comes from the main PCB8) Remove the 2 flat head screws that hold sides of the control panel.
9) Remove the 3 remaining screws that hold the front of the control panel, there
is a single washer between the control panel and cabinet for each of the 3screws.
10) Separate the control panel from the cabinet by gently pulling out on thecontrol panel.
5.8.2 Control Panel Installation
To install the Control Panel Assembly, follow the steps listed below:
1) Perform the control panel removal procedure in reverse order.
2) Make sure the 3 flat washers are placed between the control panel and thecabinet where the 3 screws are used to secure the control panel to the front of
the cabinet.
3) Replace all tie wraps on the tubing connections and wires.
5.8.3 Control Panel Main PCB Replacement
The Main control panel PCB is the large printed circuit board located on the backof the Control Panel. The Control Panel Assembly must be removed from thecabinet to replace this PCB.
The Printed Circuit Boards (PCBs) contain components that are sensitive toelectrostatic discharge (ESD) that can damage the board if not handledproperly. As when handling any ESD-sensitive PCB, observe standard ESD
safety procedures. These procedures include the following:♦ Handle the PCB by the edges only.
♦ Work on a grounded ESD mat.
♦ Wear a grounded wrist strap.
♦ Store PCB’s only in anti-static bags.
5.8.4 Control Panel Circuit Board Removal
1) Remove the Control Panel Assembly as outlined in steps 1-10 of the control
panel assembly removal procedure (5.8.1).
2) Remove the flow selector knob from the front of the control panel. This may
be done by removing the cover from the knob and turning the screw in acounter-clock-wise direction until it is loose. Once the screw is loose theknob can be removed by pulling straight out away from the control panel.

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3) Remove the flow selector assembly from the back of the control panel by
removing the 4 metric (M3) hex nuts surrounding the flow selector valve.
4) Disconnect the two pin connector from the ON/OFF switch.
5) Disconnect the 6 pin connector from the Hour Meter / O2 Alarm PCB.
6) Remove the 3 screws holding the PCB to the control panel and separate the
PCB from the control panel.
5.8.5 Circuit Board Installation

Handle the new circuit board only by the edges to prevent electrostatic
damage to the unit.
To replace the Main Control Panel PCB, follow the steps below:
1) Perform the Circuit board removal procedure in reverse order.
2) When replacing the flow selector knob be sure that the line on the knob aligns
with the proper flow setting.
3) Install the Control panel on the cabinet by following the control panel
replacement procedure.
5.8.6 Hour Meter / O2 Alarm PCB Replacement
The Hour Meter / O2 Alarm PCB is located on the back of the control panel
assembly near the bottom edge.
5.8.7 Hour Meter / O2 Alarm PCB Removal
1) Remove the control panel assembly as outlined in steps 1-10 of the control
panel assembly removal procedure (5.8.1).
2) Disconnect the 6 pin connector that runs between the main control panel PCB
and the hour meter / O2 alarm PCB.
3) Remove the two screws holding the PCB to the control panel assembly.
4) Separate the PCB from the control panel assembly.
5.8.8 Hour Meter / O2 Alarm PCB Installation

Handle the new circuit board only by the edges to prevent electrostatic
damage to the unit.

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Perform the Circuit board removal procedure in reverse order.
1) Install the Control panel on the cabinet by following the control panel
replacement procedure (5.8.2).
5.8.9 Circuit Breaker Replacement
The Circuit Breaker may be removed without removing the control panel from thecabinet. Follow the steps listed below for removal.
5.8.10 Circuit Breaker Removal
1) Set the unit’s On/Off switch in the OFF position, and unplug the power cord.
2) Remove the outside cover from the unit.
3) Disconnect the two wires connected to the back of the circuit breaker.
4) Grasp the circuit breaker from the back and push in toward the front of theunit while slightly moving it from side to side until it is free from the control
panel assembly.
5.8.11 Circuit Breaker Installation
1) Perform the circuit breaker removal procedure in reverse order.
2) Make sure the circuit breaker locks into position on the control panel
assembly.
5.8.12 Power (On/Off) Switch Replacement
The power switch is located on the control panel assembly. The control panel
assembly must be removed from the cabinet to replace the power switch. To
remove the power switch follow the steps below:
5.8.13 Power Switch Removal
1) Remove the control panel assembly as outlined in steps 1-10 of the control
panel assembly removal procedure (5.8.1).
2) Remove the control panel main PCB as outlined in steps 1-6 of the control
panel main PCB removal procedure (5.8.4).
3) Grasp the back of the power switch and push toward the front of the control
panel while pressing in on one side of the metal tabs that hold the switch tothe control panel until the switch is free of the control panel assembly.
5.8.14 Power Switch Installation
1) Perform the power switch removal procedure in reverse order.

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2) Make sure the switch is positioned so that the two black wires are facing thetwo pin connector (J3) on the control panel main PCB.
3) Replace the control panel main PCB and control panel assembly as outlined
in steps 1 & 2 of the control panel main PCB installation procedure (5.8.5).
5.8.15 Flow Selector Replacement
The flow selector is located on the back of the control panel assembly. The
control panel assembly must be removed from the cabinet to replace thiscomponent.
5.8.16 Flow Selector Removal
1) Remove the control panel assembly as outlined in steps 1-10 of the control
panel assembly removal procedure.
2) Remove the flow selector knob from the front of the control panel. This may
be done by removing the cover from the knob and turning the screw in acounter-clock-wise direction until it is loose. Once the screw is loose theknob can be removed by pulling straight out away from the control panel.
3) Remove the flow selector assembly from the back of the control panel by
removing the 4 metric (M3) hex nuts surrounding the flow selector valve.
4) Remove the encoder dial from the flow selector shaft by loosening the 4-40
set screw in the shaft collar. A 0.050” hex wrench may be used to loosen the
4-40 set screw. Once the set screw is loose the encoder dial may be removedby pulling it out over the flow selector shaft.
5) Separate the mounting plate from the flow selector by removing the twoscrews and lock washers.
5.8.17 Flow Selector Installation
1) Perform the flow selector removal procedure in reverse order.
2) Replace the control panel assembly as outlined in the control panel
installation procedure.

5.9

Main PCB Replacement
The main PCB is located inside of the unit, in the center of the top deck. To replace themain PCB, follow the steps below:

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The Printed Circuit Boards (PCBs) contain components that are sensitive toelectrostatic discharge (ESD) that can damage the board if not handledproperly. As when handling any ESD-sensitive PCB, observe standard ESD
safety procedures. These procedures include the following:♦ Handle the PCB by the edges only.
♦ Work on a grounded ESD mat.
♦ Wear a grounded wrist strap.
♦ Store PCB’s only in anti-static bags.
5.9.1 Main PCB Removal
1) Set the unit’s On/Off switch in the OFF position, and unplug the power cord.
2) Remove the outside cover from the unit.
3) Disconnect the 5 electrical connectors on the main PCB.
4) Disconnect the tubing that is connected to the pressure sensor on the main
PCB.
5) Remove the 3 screws that secure the PCB to the cabinet and separate the PCB
from the cabinet.
5.9.2 Main PCB Installation

Handle the new circuit board only by the edges to prevent electrostatic
damage to the unit.
1) Perform the main PCB removal procedure in reverse order.
2) Install a tie wrap on the tubing connected to the pressure sensor.
3) Make sure the 3 spacers are installed between the main PCB and the cabinet.

5.10 O2 Monitor PCB Replacement
The O2 Monitor PCB is located inside of the unit, near the back of the top deck. To
replace the O2 monitor PCB, follow the steps listed below:
5.10.1 O2 Monitor PCB removal
1) Set the unit’s On/Off switch in the OFF position, and unplug the power cord.
2) Remove the outside cover from the unit.
3) Disconnect the electrical connector from the O2 monitor PCB.

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4) Disconnect the green tubing by removing the tie wrap and pulling the tubing
off of the hose barb connector.
5) Remove the 4 screws that secure the PCB to the cabinet. Note the location of
the two nylon washers and the 4 spacers.
5.10.2 Monitor Installation
Perform the O2 monitor PCB removal procedure in reverse order.
Make sure the two nylon washers are between the two screws that are closest to
the back of the unit and the PCB.

5.11 Power Cord Replacement
5.11.1 Power Cord Removal
1) Set the unit’s ON/OFF switch to the OFF position, and unplug the power
cord.
2) Remove the cover (4 screws).
3) Uncoil the power cord completely from the cord wrap bracket on the back of
the unit.
4) Cut the tie-wraps that are around the power cord wires on the top deck.
5) Remove the power cord wire that is connected to the circuit breaker byholding the circuit breaker while pulling the connector off.

A 220-230 VAC unit will have brown colored wire and a 120 VAC unit uses
a black colored wire from the power cord to the circuit breaker.
6) Remove the power cord wire that is connected to the terminal marked withan “N” on Terminal 1.

A 220-230 VAC unit will have a blue colored wire and a 120 VAC unit uses
a white colored wire from the power cord to Terminal 1.
7) Cut off and discard the two connectors that are hanging free from the end of
the power cord.
8) Using a Phillips-head screw driver remove the wire clip located below thebacteria filter that is holding the power cord. Save for reuse.

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9) Pull the power cord down through the hole in the top deck and remove theremaining length of the cord from the inside of the unit by pulling it out
through the cord strain relief on the back of the unit.
10) Remove and save for reuse the three pieces of the strain relief that remainedon the power cord when it was separated from the unit. Note the orientationand sequence of the three pieces before removal.
5.11.2

Power Cord Installation
1) Place the three pieces of the strain relief removed in step 10 of 5.11.1 on
the new power cord and feed the cord through the strain relief on the backof the cabinet. Run the cord along the same path of the old power cord.
Place the end of the cord through the hole in the top deck and adjust thelength of the cord so that the outer jacket of the cord ends at the top deck.
2) Slide the three pieces of the strain relief down the cord and tighten theouter nut hand tight.
3) Secure the cord to the cabinet using the wire clip and the Phillips-headscrew that were removed during step 8 of 5.11.1.
4) If necessary, cut the power cord black or brown wire down to 2.5 inches
and the white or blue wire down to 4.0 inches.
5) Crimp a 0.250 inch connector onto the end of the black or brown wire andreconnect this wire to the circuit breaker.
Hold the circuit breaker in position while inserting the connector to prevent
damage to the circuit breaker6) Crimp a 0.187 inch connector onto the end of the white or blue wire andreconnect this wire to the open terminal on Terminal 1 that is marked withan “N”.
7) Place two tie-wraps spaced approximately 1 inch apart around the white orblue and black wires running from Terminal 1 to the power cord andpower switch. Place a second tie-wrap around the two wires that areconnected to the back of the circuit breaker.
8) Replace the unit cover and 4 screws.

AirSep Corporation
MN069-1
rev A

5 - 17

QuietLife Service Manual

6.0 Maintenance
6.1

Routine Maintenance
The QuietLife unit has either three or four filters and a 9-volt battery
that require scheduled maintenance and replacement.
In addition, you must perform a test of purity concentration on theunit at least every 90 days.
AirSep does not require preventative maintenance on thecompressor.
You do not need to perform any compressor
maintenance as long as the QuietLife remains within specification at
the desired flow rate.

6.2

Bacteria Filter Replacement
The bacteria filter must be replaced after every 10,000 hours of use.
1) Set the unit’s ON/OFF switch to the OFF position, and unplug
the power cord.
2) Remove the cover and locate the bacteria filter.

Observe the position of the filter before removal (one side of
the filter is labeled “INLET”).
3) Remove the tubing from the clip, cut the tie-wraps and separate
the green tubing from both sides of the filter.
4) Install the new filter with the inlet side in the same position as
before. Push the tubing together so that the tubing overlaps thebacteria filter connections, and secure it with tie-wraps.
5) Replace the unit cover.

6.3

Compressor Intake Filter
The QuietLife unit will be equipped with one of two different stylesof compressor intake filters. A single “Box” filter located inside theunit on the shelf assembly, or a felt cylinder / filter capsuleconfiguration. Both styles of filter should be replaced after every 6months of use.

AirSep Corporation
MN069-1
rev A

6-1

QuietLife Service Manual

AS047-1 units with serial numbers before 001028 and AS047-2 units
with serial numbers before 001255 will use the “Box” filter. Allother units will use the “Felt cylinder / Filter capsule” configuration.

6–2

AirSep Corporation
MN069-1
rev A

QuietLife Service Manual

6.3.2

Single “Box” Filter Replacement
1) Set the unit’s ON/OFF switch to the OFF position and unplug
the power cord.
2) Remove the cover and side panel to locate the compressor intake
filter box.
3) Grasp the handle on the filter housing and pull the filter out of
the filter box.
4) Remove the filter from the housing by pushing up or down on
the filter.
5) Place a new filter (MI042-1) into the housing and perform theremoval procedure in reverse to replace the filter housing.
6) Replace the side panel and cover on the unit.

6.3.3

Felt Cylinder / Filter Capsule Replacement
The Felt Cylinder and the Filter Capsule should be replaced at thesame time.
6.3.3.1 Felt Cylinder Replacement
1) Set the unit’s ON/OFF switch to the OFF position and unplug
the power cord.
2) Remove the cover and right side panel to locate the Felt
Cylinder.
3) Remove the felt cylinder by lifting it “UP” and “OFF” of thefitting.
4) Place a new felt cylinder (MI161-1) over the fitting.
5) Replace the side panel and cover on the unit.
6.3.3.2 Filter Capsule Replacement
1) Set the unit’s ON/OFF switch to the OFF position and unplug
the power cord.
2) Remove the cover and the lower left side panel to locate theFilter Capsule.
3) Cut the tie wrap that holds the filter in place.
4) Remove the filter by pushing in on the release rings on eachfitting and disconnecting the tubing.
5) Place a new filter (FI092-1) in line with the “Flow” direction
pointing toward the back of the unit. Reconnect the tubing at
each end of the capsule.
6) Place a tie wrap (TW004-1) around the filter and through theclip located on the back wall of the chamber. Pull the tie wrap
tight to keep the filter from moving.

6–2

AirSep Corporation
MN069-1
rev A

QuietLife Service Manual

7) Check all tubing connections to make sure they are secure in thefittings.
8) Replace the side panel and cover on the unit.

6.4

Air Intake Gross Particle Filter
The external air intake gross particle filter is located on the front of
the unit. You can easily remove it by hand. Instruct the patient toclean this filter weekly.

The patient must clean this filter weekly, as described below. The filter may
require daily cleaning if the QuietLife unit operates in a harsh environment
such as a house heated by wood, kerosene, or one with excessive cigarettesmoke.

1) Remove the dirty air intake gross particle filter from the filter housing on thefront of the QuietLife unit.
2) Wash the dirty filter in warm soapy water, and rinse thoroughly.
3) Use a soft absorbent towel to remove excess water.
4) Place the clean air intake gross particle filter back into the filter housing andinstall the housing on the front of the unit.

6.5 Battery Replacement
Each time the ON/OFF switch is placed in the ON position the alarm will sound.
An alarm that sounds faint indicates a weak battery. If the unit fails to alarm orsounds faint, the battery requires replacement.
The QuietLife unit does not need to be plugged into the AC outlet to test thebattery.
To replace the battery, take the following steps:

6)
AirSep Corporation
MN069-1
Rev A

1) Set the unit’s ON/OFF switch to the OFF position, and unplug the power
cord. Remove the unit’s cover (4 screws).
2) Release the Velcro strap, and lift the battery out of the battery holder.
3) Install the new battery maintaining proper polarity, and secure it with the
Velcro strap.
4) Set the ON/OFF switch to the ON position to test the alarm.
5) 6) Replace the unit cover and screws.

6-3QuietLife Service Manual

7.0 Troubleshooting
ProblemCompressor does not run.
Constant audio alarm with
ON/OFF power switch in ON
position. Blower not operating.
Compressor does not start.
ON/OFF power switch in ON
position, and cabinet blower
operates.

Compressor shuts downintermittently.

Probable CauseNo Power to unit.

Check wall outlet for power.

Unit circuit breaker tripped or
faulty.

Reset or replace circuit breaker.

Faulty electrical connections.

Check all electrical connections.

Defective ON/OFF power switch.
Faulty electrical connections forcompressor.

Replace ON/OFF power switch
Check electrical connections tocompressor.

Defective compressor capacitor.

Replace capacitor

Defective compressor.

Replace compressor

Defective compressor capacitor.

Replace capacitor.

Defective compressor.

Replace compressor.

Defective blower.

Replace blower.

Restricted air flow through unit.
Defective circuit board.
Compressor relief valve releases(popping sound)

Constant alarm with ON/OFF
switch in the ON position. Circuit
breaker repeatedly trips.

Alarm does not sound.
Abnormal operation (Red) LED
on front panel constantly ON, or
ON intermittently, no audio
alarm.

O2 alarm LED on front panel
constantly ON.

AirSep Corporation
MN069-1
rev A

Solution

Defective or sticking solenoid
valve.
Defective relief valve
Faulty electrical connection on
main PCB or valve block.
Contaminated sieve beds
Defective circuit breaker.
Faulty electrical connection.

Clean inlet filters, or remove
obstruction.
Check circuit board for valve
LED rotation / replace circuitboard.
Repair or replace solenoid valve.
Replace relief valve.
Check electrical connections /repair.
Replace sieve beds.
Replace circuit breaker.
Check electrical connections /repair.

Defective compressor capacitor.

Replace compressor capacitor.

Defective compressor.
Dead battery.

Defective ON/OFF switch.

Replace compressor.
Replace battery.
Check electrical connections /repair.
Replace ON/OFF switch.

Defective front panel.

Replace front panel.

Defective main PCB.

Replace main PCB.

Oxygen purity below
specification.

Verify oxygen purity.

Defective O2 monitor PCB.

Verify O2 monitor set-point /replace O2 monitor PCB.

Restriction in O2 monitor tubing.

Check tubing for obstructions /remove obstructions.

Faulty electrical connection.

7-1

QuietLife Service Manual

Problem

O2 alarm LED on front panel
does not illuminate.

Probable Cause
Defective LED on front panel.

Replace control panel or O2
alarm PCB.

Faulty electrical connections.

Check electrical connections /repair.

Defective O2 monitor PCB.
Product regulator set too low.
Leak.
Limited or low flow at all flow
selector settings.

Weak compressor.
Defective solenoid valve.
Reduced air intake (suction).

Limited or low flow at one
setting only.

Leak test and repair leak.
Check system pressure andrebuild or exchange compressor.
Repair or replace solenoid valve.
Check intake filter resonator andtube for restriction.
Replace flow selector.

Leak.

Leak test and repair.
Check system pressure, andrebuild or replace compressor.
Blocked air intake or defective
blower / clear obstruction, or
replace blower.
Check main PCB for correct
valve cycle sequence / replacemain PCB.
Replace sieve beds
Repair or replace solenoid valve.
Check / replace exhaust muffler.

Units internal temperature too
high.
Defective main PCB.
Low Purity.
Contaminated sieve beds
Defective solenoid valve.
Restriction in exhaust muffler.

7–2

Verify O2 monitor set-point /replace O2 monitor PCB.
Adjust regulator setting.

Plugged flow selector.

Weak compressor.

High / Low pressure alarm out ofspecification.

Solution

Restriction in intake resonator.

Check intake filter, resonator andtube obstruction / replace filter.

High flow rate.

Verify flow rate / adjust flowrate.

Defective main printed circuitboard.

Replace main printed circuitboard.

AirSep Corporation
MN069-1
rev A

QuietLife Service Manual

Appendix A♦

Process Schematic
QuietLife Basic Unit - Process Schematic

AirSep Corporation
MN069-1
rev A

QuietLife Service Manual

Legend
1. Control Panel Filter
2. Intake Filter & Resonator
3. Intake Resonator
4. Pressure Relief Valve
5. Compressor
6. Heat Exchanger
7. Left Feed Valve
8. Left Waste Valve
9. Right Feed Valve
10. Right Waste Valve
11. Blowdown Muffler
12. Pressure Test Port
13. Valve Block
14. EQ Valve

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.

Right Bed Orifice
Left Bed Orifice
Left Bed Check Valve
Right Bed Check Valve
Mixing Tank
Primary Regulator
Secondary Regulator
Bacteria Filter
Vacuum Break Check Valve
Oxygen Outlet Coupler
Oxygen Monitor PCB
Compressor Capacitor
Flow Selector
Filter Capsule
Felt Cylinder

Figure A.1: QuietLife Basic Unit – Process Schematic
AirSep Corporation
MN069-1
rev A

A-1

QuietLife Service Manual

Appendix B♦ Wiring Schematic

AirSep Corporation
MN069-1
rev A

MN069-1
rev A

AirSep Corporation

QuietLife Service Manual

Figure B.1: QuietLife Basic Unit – Wiring Schematic

B-1

QuietLife Service Manual

Appendix C♦

Specifications (AS047-2 Only)
Classification
Symbols

AirSep Corporation
MN069-1
rev A

QuietLife Service Manual

Classification (AS047-2 only)
Type of protection against electric shock:Class II

Protection from electric shock is achieved by DOUBLE INSULATION.
Protective earthing or reliance upon installation conditions are notrequired.

Degree of protection against electric shock:Type B

Equipment providing a particular degree of protection against electric
shock, particularly regarding:1.)
allowable leakage current;
2.)
reliability of protective earth connection (if present).
Not intended for direct cardiac application.

Degree of protection against harmful ingress of water:
Drip-proof equipment - IPX1
Equipment provided with an enclosure preventing entry of such an amount of falling
liquid as might interfere with the satisfactory and safe operation of the equipment.
Degree of safety of application in the presence of flammable anesthetic gases:
Equipment not suitable for such application.
Mode of operation:
Continuous duty.

AirSep Corporation
MN069-1
rev A

C -1

QuietLife Service Manual

Symbols (AS047-2 only)
Symbols are frequently used on equipment in preference to words with the intention of obviating
language differences and permitting easier comprehension of a marking or indication, sometimes
in a restricted space.
The following table is a list of symbols and definitions used with the QuietLife Oxygen
Concentrator. These symbols are taken from the appropriate International ElectrotechnicalCommission (IEC) standards:
SymbolC-2

IEC
Publication

Description

878-02-02

Type B Equipment

417-5032

Class II Equipment

529

Protected against dripping water

348

Attention, consult ACCOMPANYING DOCUMENTS

AirSep Corporation
MN069-1
rev A