AirSep visionaire User manual

MN138-1 Rev J
Oxygen Concentrator
Service Manual
For VisionAire, VisionAire 2 & VisionAire 3 Models

ii MN138-1 Rev J
____________________________________________________________________________________
Expedited Product Warranty Check service is available at 800-482-2473

iii MN138-1 Rev J
Table of Contents
Section 1.0
Introduction
1.1 Equipment Provider Responsibility 1
1.2 Important Notice and Symbol Explanations 2
1.3 Functional Specifications 5
Section 2.0
Operation Check
and Oxygen
Concentration Test
2.1 Description of Operation 6
2.2 Operation Check 6
2.3 Alarm System 6
2.3.1 Start Up 7
2.3.2 Power Failure Alarm Test 7
2.3.3 No Flow Alarm Test 7
2.4 Oxygen Concentration Test and Specification 7
Section 3.0
General Instructions
3.1 Instructions 8
3.2 Patient, Provider, and Routine Maintenance 9
3.2.1 Product Filter –No Maintenance Required 9
3.2.2 Preparing for New Patient Use/Method 9
of Cleaning and Infection Control
Section 4.0
Main Components
4.1 Components 10
4.2 Cabinet Removal 10
4.2.1 Removing Front Panel 10
4.2.2 Removing Back Panel 10
4.3 Compressor 10
4.3.1 Compressor Replacement 11

iv MN138-1 Rev J
4.3.2 Capacitor Replacement 12
4.4 Solenoid Valves 12
4.4.1 Valve Manifold Replacement 12
4.4.2 Solenoid Valve Coil Replacement 14
4.5 Sieve Beds 14
4.5.1 Sieve Bed Replacement 14
4.6 Cabinet Fan 15
4.6.1 Cabinet Fan Replacement 15
4.7 Circuit Board 16
4.7.1 Circuit Board Replacement 17
4.8 Product Regulator Check and Setting 18
4.8.1 Setting Product regulator for Normal 18
Operation
4.8.2 Product Regulator Lockout 18
4.8.3 Back Pressure Correction 19
4.8.4 Product Regulator Cleaning or Rebuilding 19
4.9 Circuit Breaker Replacement 20
4.10 l/0 Power Switch Replacement 20
4.11 Hour Meter Replacement 21
4.12 Flow Meter Replacement 21
4.13 Power Cord Replacement 22
4.14 Oxygen Monitor Circuit Board Replacement 23
4.15 Mixing Tank Replacement 23
4.16 Exhaust Muffler Replacement 23
4.17 Caster Replacement 24
4.18 Roller Base Replacement 25
4.19 Air Outlet Option (if equipped) 25

v MN138-1 Rev J
Section 5.0
Troubleshooting
5.1 Operation Pressure Test 26
5.1.1 High Operating Pressure 26
5.1.2 Low Operating Pressure 26
5.2 General Troubleshooting 27
5.3 Troubleshooting Chart 28
5.4 Tool Kit and Pressure Test Gauge 31

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MN138-1 Rev J
1.0 Introduction
1.1 Equipment Provider Responsibility
All Equipment Providers of the VisionAire™ Oxygen Concentrator must assume responsibilities
for handling, operational check-out, patient instruction, and oxygen concentration checks. These
responsibilities are outlined below and throughout this manual.
As an Equipment Provider, you must do all of the following:
Inspect the condition of each VisionAire unit immediately upon delivery to your business
location. Note any sign of damage on the delivery receipt, and report it directly to both
the freight company and AirSep Corporation immediately.
Check the operation of each VisionAire unit before delivery to a patient. Confirm the
oxygen concentration level is within specifications as referred to in Section 2.4. (Test the
power disconnect alarm as described in Section 2.3 of this manual.)
Deliver VisionAire units only to patients authorized by a licensed health care provider or
physician’s prescription. The VisionAire oxygen concentrator must not be used as a life-
supporting device. A backup supply of oxygen must be available.
Instruct patients how to use VisionAire in conjunction with the Patient Manual.
Instruct patients to notify their licensed health care provider/physician if they experience
any signs of discomfort.
Be available to provide service to each patient at any time.
Establish and implement a protocol to check oxygen concentration.
This unit is not a life-support device. Geriatric, pediatric, or any other patient
unable to communicate discomfort while using this oxygen concentrator may
require additional monitoring. Patients with hearing and/or sight impairments
may need assistance with monitoring the alarms.
This device supplies high-concentration oxygen that promotes rapid burning.
Do not allow smoking or open flames within the same room of (1) this device,
or (2) any oxygen-carrying accessory. Failure to observe this warning can
result in severe fire, property damage, and/or cause physical injury or death.
Use no oil, grease, or petroleum-based or other flammable products on or
near nasal end of cannula or on the VisionAire unit. Oxygen accelerates the
combustion of flammable substances.

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MN138-1 Rev J
1.2 Important Notice and Symbol Explanations
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.
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 definitions that may be used with AirSep’s
VisionAire Oxygen Concentrators. These symbols are referenced from the appropriate
International Electro-technical Commission (IEC) standards:
Symbol
Description
Symbol
Description
ON (power switch on)
OFF (power switch off)
No smoking
Do not disassemble
Type BF equipment
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
Class II Device
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
See Instructions

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MN138-1 Rev J
Symbol
Description
Symbol
Description
Consult the accompanying
documents
Keep unit and accessories dry
Use no oil or grease
Proper disposal of waste of electrical
and electronic equipment required
Oxygen outlet connection to the
cannula
Do not expose to open flames
Caution: Federal law (USA)
restricts this for sale or rental by
or on the order of a physician or
licensed health care provider.
Keep in the vertical position
Fragile –handle with care
Oxygen concentration warning LED
Method disposing of waste: All waste from the VisionAire (patient circuit, etc.) must be disposed of
using appropriate methods.
Method for disposing of the device: In order to preserve the environment, the concentrator must only
be disposed of using the appropriate methods.
Conformity with EN 60-601 (§ 6.8.2 b):
“The manufacturer, assembler, installer or importer is not considered to be responsible themselves for
the consequences on the safety, reliability and characteristics of a device unless:
- The assembly, fitting, extensions, adjustments, modifications or repairs have been performed by
persons authorized by the party in question.
- The electrical installation of the corresponding premises complies with IEC regulations.
- The device is used in accordance with the instructions for use.” If the replacement parts used for the
periodic servicing by an approved technician do not comply with the manufacturer’s specifications, the
latter is absolved from all responsibility in the event of
an accident. Do not open the device while in operation: risk of electrical shock. This device complies
with the requirements of the 93/42/EEC European directive but its operation may be affected by other
devices being used close by, such as diathermy and high frequency electro-surgical equipment,
defibrillators, short wave therapy equipment, mobile telephones, CB and other portable devices,
microwave ovens, induction plates or even remote control toys and more generally electromagnetic
interferences which exceed the levels specified by the EN 60601-1-2 standard.

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MN138-1 Rev J
Classification
Type of protection against electric shock:
Class II Protection from electric shock is achieved by DOUBLE INSULATION.
Protective earthing or reliance upon installation conditions is not required.
Degree of protection against electric shock:
Type BF 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:
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.
Method of cleaning and infection control allowed:
Please refer to the General Instructions section in the VisionAire Service Manual.
Degree of safety of application in the presence of flammable anesthetic gases:
Equipment not suitable for such application.
Mode of operation: Continuous duty.

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MN138-1 Rev J
1.3 Functional Specifications
Oxygen Concentration: 1-5 liters per minute at 90% +5.5/-3%
1-3 liters per minute at 90% +5.5/-3% (VisionAire 3)
⅛-2 liters per minute at 90% +5.5/-3% (VisionAire 2)
(Based on 70°F [21°C] at sea level)
Accuracy: ± 10% of indicated flow setting, or ± 200 ml, whichever is greater.
Response Time: Allow 5 minutes to attain maximum oxygen concentration.
Positioning: Operate the unit in an upright position, maintaining at least 12 inches
(30.5cm) of open space on all sides for ventilation.
Dimensions: 20.8 in. high, 14.1 in. wide, 11.5 in. deep
(52.8 cm high, 35.8 cm wide, 29.2 cm deep)
Weight: 30 lb; shipping weight –37 lb
(13.6 kg; shipping weight –16.7 kg)
Electrical (+/- 10%):
115VAC, 60 Hz, 3 amps, 290 watts
115VAC, 60 Hz, 3 amps, 190 watts (VisionAire 3)
115VAC, 60 Hz, 3 amps, 200 watts (VisionAire 2)
220-240 VAC, 50 Hz, 1.5 amps, 290 watts
220 VAC, 60 Hz, 1.5 amps, 290 watts
230 VAC, 50 Hz, 1.5 amps, 180 watts (VisionAire 2)
230 VAC, 50 Hz, 1.5 amps, 175 watts (VisionAire 3)
Alarms: Power Failure
Low Oxygen Concentration (with optional Oxygen Monitor)
Low Pressure
High Pressure
High Temperature
No Flow
Electrical Shock Class II, Type B
Protection:
Operating Temperature 41 to 105°F (5 to 40°C)
Range:
Storage Temperature -4 to 140°F (-20 to 60°C)
Range:
Humidity: 15 –95% (non-condensing)

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MN138-1 Rev J
2.0 Operational Check and Oxygen Concentration Test
2.1 Description of Operation
Air is drawn into the VisionAire Oxygen Concentrator. For overall, sound efficiency, before air
enters the compressor, it passes through the unit’s intake muffler. Pressurized air then exits the
compressor and moves to the valve manifold. The valve manifold incorporates the use of five
two-way solenoid valves which control the flow of air and oxygen in and out of the molecular
sieve beds. The unique property of molecular sieve enables it to physically attract (adsorb)
nitrogen when air passes through this material, thus producing high concentration oxygen.
There are two sieve beds: while one produces high concentration oxygen, the other is purged of
the nitrogen it adsorbed (collected) during this pressure swing adsorption (PSA) cycle. Each
adsorber produces oxygen and delivers it to the product tank. Oxygen exits the product tank
through a pressure regulator, flow control valve, flow meter, and finally exits the unit. The
VisionAire unit delivers up to 95.5% oxygen at the prescribed flow rate.
2.2 Operation Check
AirSep tests every VisionAire Oxygen Concentrator thoroughly after manufacture. You
must perform the following test to ensure that no damage occurred in shipping or handling.
Do not use extension cords with this unit or connect too many plugs into
the same electrical outlet. The use of extension cords could adversely affect
the performance of the device. Too many plugs into one outlet can result in
an overload to the electrical panel causing the breaker/fuse to activate or
fire if the breaker or fuse fails to operate.
1. Open and inspect all cartons (that contain units) upon delivery. Unpack the unit and
remove it from the carton. Inspect the unit itself for damage. If the exterior of a unit’s
carton is damaged, or the unit itself is damaged, note it on the freight bill signed by the
driver.
2. Plug in the power cord of the unit, and set the I/0 power switch to the “I” position. Check
to see that the following occurs:
a. A continuous alarm sounds for approximately four seconds. See the
troubleshooting chart in Section 5.0 of this manual if the unit’s alarm does
anything other than sound for four seconds.
b. The compressor runs and flow is indicated in flow meter.
c. OPTIONAL: The Oxygen Monitor’s amber light will remain on for four
minutes upon startup regardless of unit’s concentration. After four
minutes, the light will go out if the concentration level has reached
minimum concentration requirements.
d. Perform an oxygen concentration test, as described in Section 2.4.
2.3 Alarm System
The VisionAire Oxygen Concentrator is equipped with an alarm system, which sounds an
intermittent alarm when a power failure or other alarm condition occurs.
The intermittent alarm sounds are displayed in the following table:

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MN138-1 Rev J
VisionAire Intermittent Alarm Indicators
Condition
No
Power
Low O2
Low
Pressure
High
Pressure
High
Temperature
No
Flow
Audible
Alarm
One beep
Two
beeps
Three
beeps
Four
beeps
Five
beeps
Six
beeps
If the high pressure alarm is activated, the compressor and valves will shut down, and the
audible four–beep alarm will continue. This alarm remains on until you set the I/0 power switch
to the “0” position.
Refer to Section 5.0 for alarm identifications, and a list of probable alarm causes.
2.3.1 Start Up
Each time the VisionAire unit is turned on, an alarm should sound for approximately four
seconds.
2.3.2 Power Failure Alarm Test
To test the power failure alarm, disconnect the unit from power, set the l/0 power switch
to the “I” position. This should activate the audible one-beep alarm.
If the unit has not been used for an extended period of time, it needs to
operate for several minutes to recharge the power failure alarm.
2.3.3 No Flow Alarm Test
To test the no flow alarm, place thumb over oxygen outlet to completely block flow for
approximately 10-15 seconds. The flow meter ball should drop to zero and the 6-beep alarm
should be activated. (Note: not all units were originally manufactured with a no flow alarm.
Units equipped with main circuit boards prior to rev. R will not have this feature.)
2.4 Oxygen Concentration Test and Specification
To ensure that the unit’s output of oxygen is within specification, you must perform a test
of the oxygen concentration. Test the unit upon delivery to a patient and at periodic
intervals. Equipment Providers need to establish and implement a protocol to check
oxygen concentration.
1. If a humidifier bottle is used, disconnect it.
2. Connect a calibrated oxygen concentration analyzer to the oxygen outlet.
3. Verify that the product flow rate delivered by the unit matches the patient’s
prescription and does not exceed the capacity of the unit.
4. Set the unit’s l/0 power switch to the “I” position. Allow approximately five minutes
for the oxygen concentration to stabilize. Take oxygen concentration readings and
verify levels are within specification at the liter flow being tested.
5. Disconnect the oxygen analyzer, and reconnect the humidifier bottle.
Do not measure oxygen concentration output after the product stream passes
through a humidifier bottle, or erroneous readings will result.

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MN138-1 Rev J
3.0 General Instructions
3.1 Instructions
It is important that patients thoroughly understand how to operate the AirSep VisionAire unit.
This enables proper treatment as prescribed by a qualified, licensed health care
provider/physician. If patients experience any discomfort or the unit alarms, they must notify
their licensed health care provider/physician immediately.
You, as the Equipment Provider, are responsible to see that each patient receives the Patient
Manual. Explain each step in the operation of the unit to the patient in reference to this manual.
Smoking while using oxygen is the number one cause of fire, injury, and death.
You must follow these safety warnings:
Do not allow smoking, candles, or open flames within the same room of the device
or oxygen-carrying accessories.
Smoking while wearing an oxygen cannula may result in facial burns and possibly
death.
Removing the cannula and placing it on surfaces such as bedding, sofas, or other
cushion material will cause a flash fire when exposed to a cigarette, heat source, or
flame.
If you smoke, you must follow these 3 life-saving steps: turn off the oxygen
concentrator, take off the cannula, and leave the room where this device is located.
“No Smoking – Oxygen in Use” signs must be prominently displayed in the home
or where the oxygen concentrator is in use. Patient and their caregivers must be
informed about the dangers of smoking in the present of, or while using, medical
oxygen
This device supplies high-concentration oxygen that promotes rapid burning. Do
not allow smoking or open flames within the same room of (1) this device, or (2)
any oxygen-carrying accessory. Failure to observe this warning can result in severe
fire, property damage, and /or cause physical injury or death.
Electrical shock hazard. Disconnect the power cord from the electric outlet before
you clean the unit to prevent accidental electrical shock and burn hazard. Only your
Equipment Provider or a qualified service technician should remove the covers or
service the unit.
Care should be taken to prevent the VisionAire from getting wet or allowing any
liquid to enter the unit. This can cause the unit to malfunction or shut down, and
cause an increased risk for electrical shock or burns.

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MN138-1 Rev J
Do not use liquid directly on the unit. Clean the exterior of unit and power cord
only with a mild household cleaner applied with a damp cloth or sponge, and then
wipe all surfaces dry.
3.2 Patient, Provider, and Routine Maintenance
AirSep does not require any preventative or routine maintenance on the VisionAire concentrator.
VisionAire’s unique design and technology allows for a virtually maintenance-free oxygen
concentrator. You do not need to perform any maintenance as long as the VisionAire unit
remains within specifications at the desired flow rate.
The VisionAire does not incorporate an external air intake gross particle filter or
batteries that require replacement.
3.2.1 Product Filter –No Maintenance Required
The product filter is located internally within the unit’s product tank. There is no
requirement for replacement. It is designed to last for the life of the concentrator.
3.2.2 Preparing for New Patient Use/Method of Cleaning and Infection
Control
When you remove the VisionAire from a patient’s home or facility, always dispose of the
used cannula and humidifier bottle. Clean the exterior of the VisionAire with soapy
water solution or mild household cleaner applied with a damp cloth or sponge to remove
any gross debris. Do not use liquid directly on unit, and be careful not to get liquid into
the interior of the unit.
Next, following same guidelines above, clean the exterior with either a common
chemical disinfectant or bleach solution*, wear eye and skin protection. After using the
disinfecting solution, wipe entire unit with a cloth or sponge applied with water only,
then wipe dry. Make sure unit is completely dry and then retest it before you return it to
inventory.
* The manufacturers of sodium hypochlorite products recommend various strengths
of a bleach solution for killing bacteria, etc., based on the type of germ to disinfect;
however, a generally recommended solution is ¾ cups of household bleach per
gallon of water.

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MN138-1 Rev J
4.0 Main Components
4.1 Components
The design of the VisionAire Oxygen Concentrator allows for easy access and removal of most
components. This allows you to perform repair and replacement of parts with minimal time and
effort.
To prevent accidental electric shock or burn, be sure to set the unit’s I/0
power switch to the “0” position and unplug the power cord of the unit
from the electrical outlet before you service the VisionAire Oxygen
Concentrator.
Some internal components, including the compressor may require cooling
down before component removal. Care should be taken when removing
all components.
Before reattaching tubing connections using a tie-wrap, remove 1/8 inch
(0.32 cm) from end of tubing to assure a proper seal. Tubing should be
cut evenly across width.
4.2 Cabinet Removal
4.2.1 Removing Front Panel
To remove the unit’s front panel, locate and unscrew both ¼ turn fasteners located at the
top of the unit.
4.2.2 Removing Back Panel
To remove the unit’s back panel, locate and unscrew both ¼ turn fasteners located behind
the humidifier bottle retaining strap within the humidifier bottle recess area of back
panel.
4.3 Compressor
The compressor is the “pump” within the oxygen concentrator that pushes the room air into the
top of the sieve beds. This allows oxygen to flow out of the bottom of the sieve beds in the
VisionAire unit.
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. This
depends upon the model of the compressor, stroke length, bore size, and cup seal condition. The
cup seals form the seal between the piston and the cylinder wall. As the cup 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.
Since this drop in oxygen production occurs over a long period of time, preventative
maintenance on the compressor is not required. You can continue a patient’s therapy on the
VisionAire unit as long as that unit’s oxygen concentration level at the prescribed flow rate is
within AirSep’s specifications.

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MN138-1 Rev J
Sound Level
The condition of the compressor’s cup seals, bearings, and other components can result in
an increased sound level. If the compressor’s cup seals or bearings wear to the point that they
become noisy, the concentrator may become noticeably louder, therefore compressor service or
exchange may be required.
4.3.1 Compressor Replacement
Some internal components, including the compressor may require
cooling down before component removal. Care should be taken when
removing all components.
Compressor Assembly Removal
To remove the compressor assembly, follow the steps below:
1. Set the unit’s I/0 switch to the “0” position and unplug the power cord.
2. Remove the front panel of unit.
3. Remove screws securing the compressor cover to the compressor enclosure, and
remove cover to access compressor assembly.
4. Locate the 2-pin wire connection labeled ‘compressor’ on circuit board, and
carefully disconnect connector from the circuit board.
5. Disconnect both wire connections from capacitor.
6. Remove the compressor by gently lifting it up and pulling it towards you at the
same time.
7. Disconnect output tubing from left side of compressor assembly.
Compressor Assembly Installation
To install compressor assembly, follow the steps below:
1. Locate new compressor assembly.
2. Attach output tubing to compressor. Turn tubing ¼ turn in counter-clockwise
direction and hold in that position while tightening fitting. If this is not done, the
compressor will lean forward and contact the enclosure cover.
3. Assure compressor assembly is installed correctly. All four compressor springs
must be installed on to their corresponding spring guides located on the bottom of
the compressor compartment.
4. The end of the temperature probe must be located within the compressor
compartment and positioned behind the compressor wires before installing the
compressor cover.
5. Care should be taken when reconnecting wire connections to the circuit board and
capacitor. Both sets of wires from compressor must be routed properly through
the loop on tie wrap mount located inside of the compressor compartment, up
through the small recessed area of compressor compartment in front of
temperature probe, and alongside the back of capacitor to avoid possible damage
when front cover is installed.
6. Compressor wires must be allowed to freely move within tie wrap loop. Care
must be taken to assure compressor wires are not pulled by loop of tie wrap
mount when properly installed. If new tie wrap is needed, it is important to
engage only the first few notches of the tie wrap.
7. Before installing compressor cover, assure compressor wires are not in contact
with compressor.
8. Leak test output tubing connection of compressor.

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4.3.2 Capacitor Replacement
The capacitor starts the compressor. If the compressor cannot start, the capacitor may be
defective and require replacement. To replace the capacitor, follow the steps below:
1. Set the unit’s I/0 switch to the “0” position and unplug the power cord.
2. Remove front panel and locate capacitor.
3. Gently slide entire compressor enclosure towards you to allow easier access to the
capacitor. (Do not pull out enclosure too far as damage may occur to certain
components within concentrator).
4. Carefully disconnect both wire connections from the capacitor, slide capacitor out
from tie-wrap.
5. To install new capacitor, slide capacitor into the tie-wrap holding it in place, and
connect both wire connections to capacitor. Tie-wrap should be centered on
capacitor when properly installed.
6. Return compressor enclosure to its original position, reinstall front cover.
4.4 Solenoid Valves
The VisionAire uses five two-way solenoid valves: two feed, two waste, and one equalization.
Each valve has an open (energized) and closed (de-energized) position. As the VisionAire
operates, two or three valves are always energized. The solenoid valves of the VisionAire unit
require no scheduled maintenance.
4.4.1 Valve Manifold Replacement
Valve Manifold Removal
To remove the valve manifold, follow the steps below:
1. Set the unit’s I/0 switch to the “0” position and unplug the power cord.
2. Remove both front and back panels.
3. Remove the compressor assembly by following the compressor removal
procedure outlined under section 4.3.1.
4. Remove tubing attached to the exhaust muffler assembly. Do not remove muffler
assembly.
5. Disconnect small tubing from the in-line adaptor leading to the sensor located on
the circuit board.
6. Disconnect the wire connectors labeled AC Power and PowerSw from circuit
board. (If equipped with an O2 oxygen monitor, also disconnect wire connectors
labeled O2 LED and Sensor).
7. From back of unit, disconnect tubing connections at the equalization valve and
disconnect fittings from top of both sieve beds.
Temporarily seal sieve bed openings with tape to prevent the sieve material from
being exposed to the moisture in room air. Prolonged exposure to room air
results in contamination and permanent damage to the sieve material.
8. With adjusting compressor enclosure (alternating pulling out top and bottom),
gently remove the compressor enclosure from the center section of unit by sliding
it out through the front.
9. With the compressor enclosure completely removed, carefully remove all valve
retainer clips and coils from each valve stem. Wire connectors can remain

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MN138-1 Rev J
attached to coils for easier installation. ( Please refer to the Valve Wire Harness
drawings WH105-1 located on page C in the Appendix section of this manual as
needed)
Care must be taken when removing and installing valve coil retainer
clips.
10. Using 1/8-inch Allen wrench, remove mounting bolt securing the manifold to the
center section. Remove manifold assembly from compressor enclosure.
11. With the tubing still attached from the exhaust muffler and compressor, remove
the fittings and tubing located on the underside of the valve manifold using a
7/16-inch open end wrench.
12. Disconnect fittings and remove the sieve bed feed tubing from manifold using a
9/16-inch open end wrench.
13. Disconnect small tubing from both sides of the valve manifold.
Valve Manifold Installation
To replace the valve manifold, follow the steps below:
To follow this procedure easier, view the manifold from the front when reassembling
components to manifold. Equalization valve will be positioned in the front of manifold
when viewed this way.
1. Perform the valve manifold removal procedure in reverse order.
2. When installing the fittings from the sieve bed tubing, do not over tighten.
3. Remove original sealant tape from threads on fittings which will be installed to
underside of manifold. Apply new sealant tape to fittings before installation.
a. Fitting with braided tubing attached (compressor) must be installed to the
left underside of manifold. Fitting with tubing attached (exhaust muffler)
must be installed to the right underside of manifold.
b. Foam pieces should be in place over fittings before installing manifold to
compressor enclosure.
4. Valve manifold must be positioned properly before installation. When positioned
correctly, the front of the valve manifold will face towards the back of the
compressor enclosure, and will rest on the support pins on top of the enclosure.
5. When installing coils onto manifold valve stems, view manifold from the front.
a. The front valve stem is the equalization valve and its coil should be
installed having the wire terminals positioned on the bottom of the valve
stem. The other coils must be installed having their wire terminals located
on top of their valve stems.
b. The outside (feed) valve coils must be installed so their wire terminals are
pointing towards the front of manifold.
c. The inside (exhaust) valve coils must be installed so their wire terminals
are pointing towards the back of manifold.
d. Valve coil retainer clips must be installed correctly so that the open ends
are pointing downward on top of valve coil.
6. Periodic adjustment of the compressor enclosure may be required when
reinstalling into center section.

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a. Care must be taken not to pinch any wires or tubing between the
compressor enclosure and center section before final installation.
b. The wire harness for both the left feed valve and the equalization valve,
along with the wire harness for the right feed valve, must be routed
outside of the valve manifold assembly before connecting to valve coils.
c. The AC I/0 power switch wire harness and the pressure tubing to the
circuit board sensor must be routed to the outside of the manifold
assembly and along the back of the capacitor before installation.
7. When reinstalling fittings to top of the sieve beds, ensure wires and tubing on
both sides are located inside of these connections.
8. If equipped with an O2 oxygen monitor, be sure to reconnect wire connections
labeled O2 LED and Sensor to circuit board.
9. When reattaching tubing to exhaust muffler, be sure to secure with tie-wrap.
10. Install the compressor assembly by following the compressor assembly
installation procedure outlined under section 4.3.1.
4.4.2 Solenoid Valve Coil Replacement
An ohmmeter can be a useful tool in determining the condition of a valve coil. When
using an ohmmeter, each valve coil should be between 713 –837ohms.
To replace a solenoid valve coil, follow the steps below:
1. Set the unit’s I/0 switch to the “0” position and unplug the power cord.
2. Remove back panel.
3. Carefully remove valve retaining clip from coil to be replaced.
4. Disconnect both wire connectors from solenoid valve, lift coil off of valve stem.
5. Install new coil on valve stem, reinstall coil retaining clip, and reconnect both
wire connectors to coil.
6. Valve coil retainer clips must be installed correctly so that the open ends are
pointing downward on top of valve coil.
4.5 Sieve Beds
The VisionAire unit utilizes two sieve beds each containing molecular sieve. The unique
property of molecular sieve enables it to physically attract nitrogen when air passes through this
material, thus producing high concentrated oxygen.
While one sieve bed produces high-concentration oxygen, the other is purged of the nitrogen it
adsorbed (collected) while it concentrates oxygen. Each adsorber (sieve bed) produces oxygen
and delivers it to the mixing tank.
4.5.1 Sieve Bed Replacement
Temporarily seal sieve bed openings with tape to prevent the sieve
material from being exposed to the moisture in room air. Prolonged
exposure to room air results in contamination and permanent damage to
the sieve material.
VisionAire 2 uses different sieve beds (BE187-4) thanVisionAire or
VisionAire 3 (BE187-2). The beds look the same but use different
molecular sieve (SI015-1 for V2).

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MN138-1 Rev J
Leaks can be so small in air loss that oxygen concentration is not affected
immediately. The sieve material can become contaminated gradually.
Careful leak testing is important as the sieve material can become
contaminated gradually with very small leaks.
If replacement is necessary, you must replace both sieve beds at the same
time.
Sieve Bed Removal
To remove sieve beds, follow the steps below:
1. Set the unit’s I/0 switch to the “0” position and unplug the power cord.
2. Remove back panel.
3. Remove the fitting on the top of each sieve bed.
4. While keeping the four large sieve bed tie-wraps in place, gently pull upwards on
the top tie-wrap and remove each bed.
5. Lift each sieve bed from bottom tie-wrap and disconnect product tubing located at
bottom of each bed connection.
Sieve Bed Installation
To install the sieve beds, follow the sieve bed removal procedure in reverse order.
All tubing connections must be tightened properly to eliminate leaks. (Do not over
tighten fittings.)
To check for leaks, take the following steps:
1. Plug unit in and set the unit’s I/0 switch to the ‘I’ position.
2. Allow unit to run for three minutes.
3. Apply soapy water solution around tubing connections on both sieve beds, and
check for leaks.
4.6 Cabinet Fan
The cabinet fan pulls ambient air into the VisionAire unit. As this air is drawn in, the air cools
internal components (including the compressor) and exits out the bottom of the unit.
4.6.1 Cabinet Fan Replacement
Periodic adjustment of the compressor enclosure may be necessary
during this process.
Cabinet Fan Removal
To replace the cabinet fan, follow the steps below:
1. Set the unit’s I/0 switch to the “0” position and unplug the power cord.
2. Remove both front and back panels.
3. From back of unit, disconnect tubing connections at the equalization valve and
disconnect fittings from top of both sieve beds (Temporarily seal sieve bed
openings with tape to prevent the sieve material from being exposed to the
moisture in room air.)
4. From the front of the unit, disconnect small tubing from the in-line adaptor
leading to the sensor located on the circuit board.