VARON NT-4/VH03 User manual

Oxygen Concentrator
Instruction manual
Model :NT-4/VH03
Please read the instruction manual carefully before using the product.The picture is for reference only.Please refer to the actual product！

01CONTENTS
Precautions
Working Principle
Product Description
List of Attachments
Technical Specifications
External View
Operation Steps
Instructions for the Panel
Instructions for the Remote Control
Specific Functions
Maintenance and Repair
Trouble Shooting
Other Matters
02
03
04
04
05
06
07
10
11
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021. Precautions
Warning: This is not a medical device and is not considered life-sup-
port or life-sustaining equipment.
Warning signs on the product are designed to help users understand and
use this product correctly to prevent damage and a property loss.The
main warning signs and meanings are as follows:
▲The machine shall be placed indoors. Keep the room well-ventilated
and avoid direct sunlight. Keep the product more than 30 meters away
from the walls and other objects.
▲Do not place miscellaneous items and liquid containers on the machine
case.
▲It is prohibited to stack sundries at the ventilation hole on the back of
the machine to prevent clogging of intake and exhaust, which may lead to
excessive temperature and thus cause improper shutdown or a decrease
in oxygen concentration.
▲To avoid the machine being interfered by strong electromagnetic
environment or interfering with other electrical appliances, please keep it
at least 3 meters away from other household appliances when using.
▲Do not place the machine upside down or laid it horizontally.
▲If the voltage is unstable and exceeds the range of 220±15V, please
connect the voltage regulator before use.
▲Please use a safe and qualified socket and a terminal block with safety
electrician certification.
▲Oxygen is a combustion-supporting gas. Therefore, when using the
machine,do not smoke and keep away from the fire source to avoid a fire
hazard.
▲Do not turn on and off the machine too often. Turn off the machine for
3-5 minutes before restarting to maintain the normal service life of the
machine.
Prohibited action
Required action
Keep dry
Caution (Warnings and dangers)
Class II equipment
This side up

032. Working Principle
▲No oil or greasy substance should be used in any part of the machine.
▲Do not use the machine without an air filter.
▲Do not bend the oxygen-inhalation tube when using the machine,
otherwise, it will affect the normal output of oxygen.
▲Unauthorized personnel should not disassemble the cover.
▲Do not bend the oxygen-inhalation tube when using The machine
otherwise it will affect the normal output of oxygen.
▲Unauthorized personnel should not disassemble the cover.
Air enters the compressor after being filtered through the inlet filter device,
and is compressed into the molecular-sieve tower for oxygen-nitrogen
separation. Oxygen passes through the molecular-sieve tower and enters
the fine sieve tower, while nitrogen is adsorbed by the molecular sieve
and discharged into the atmosphere through the separation valve. With
the increase of oxygen concentration in the fine sieve tower, oxygen is
finally delivered to the user through the oxygen delivery pipe under the
control of the electronic flow control valve.
Schematic Diagram of Oxygen Machine
Air
Filter
Separating
Valve
Oil free air compressor
Cooling System
Molecular Sieve
Tower
Oxygen Gas
Control
Valve

3. Product Description
4. List of Attachments
This product is applicable to AC 230V/50Hz(110V/60Hz) voltage. It is
equipped with a pure copper oil-free compressor and a high-quality
molecular sieve. It uses air as raw material to produce high-purity oxygen
through a new Pressure Swing Adsorption method (PSA) at room
temperature, which can be used for household supplementary oxygen
absorption.
The product is designed according to a standard higher than the standard
for household appliances. It is fitted with a large clear LED display screen.
With intelligent chips controlling the circuit, the machine has automatic
fault alarm function, timing function and overheating circuit protection
function. When the working temperature of the compressor is too high, it
will automatically stop working to better protect the safety of the compres-
sor and the whole machine.
This product is easy to operate, lightweight and portable. It is not only
suitable for home use, but also can be used in a car by using the automo-
bile power supply.Suitable for household oxygen supplement.
Main machine
Oxygen inhaler kit
Parts for nebulization (NT-4/VH03 model only)
Remote control (NT-4/VH03 model only)
Instruction manual
Certificate of Conformity (attached to the manual)
Power cord
X1
X1
X1
X1
X1
X1
X1
After unpacking, please first check whether the appearance of the product
is intact. Then count the items in the package one by one according to the
list of attachments above. In case of any omission, please contact the
after-sales customer service. 04

5. Technical Specifications
Product name: Oxygen Concentrator Model: NT-4/VH03
Oxygen production method: Pressure Swing Adsorption method (PSA)
Rated voltage: AC230V/50Hz; AC110V/60Hz
Input power: 120VA
Oxygen flow rate: 1-7L/min adjustable
Oxygen concentration: 28-90%
Oxygen output pressure: 20-70kPa
Carbon dioxide: Qualified according to the specified test
Carbon monoxide: Qualified according to the specified test
PH.: Qualified according to the specified test
Morphological identification: Colorless and odorless combustive gas
Voice speaker: 0.5W/8Ω (NT-4/VH03 model only)
Maximum Timer Duration: 180 minutes
Atomization rate: ≥0.2mL/min(NT-4/VH03 model only)
Operating noise: ≤42dB(A weighting)
Electrical classification: Class II
Product size: 204x214x280mm
Net weight: 4.8kg
Normal working conditions
Ambient temperature: 5℃~40℃
Relative humidity: ≤80%RH
Atmospheric pressure: 86kPa-106kPa
※When the temperature is lower than 5 ℃, the equipment shall be
placed under normal working conditions for more than four hours before
use.
Transportation and storage conditions
Ambient temperature: -20℃~60℃
Relative humidity: <93%RH 05

ON/OFF
Oxygen concentration display
Timing & Total
running time
Power jack
Timer
Flow rate
Oxygen flow rate
Oxygen Outlet
Handle
Nebulizing Outlet
(Only available for NT-4/VH03)
Power switch
Fuse
mins1
L/min
2
3
4
5
6
7
Nebulizing Outlet
TI MEFLOW
Oxygen Outlet
6. External View 06

Nebulizing Outlet
mins1
L/min
2
3
4
5
6
7
Oxygen Outlet
Oxygen inhalation tube
① Connect the power cord
Insert the output terminal of the power cord
into the power port on the machine first (as
shown in the left figure), and then insert the
other terminal of the power cord into the
socket.
②Connect the oxygen tube
Insert the large diameter end of the oxygen
inhalation tube into the "Oxygen outlet"
port.
7. Operation Steps 07

Nebulizing Outlet
Atomizing tube
Nasal cannula
③ Connect the atomizing tube.(NT-4/VH03
only) As shown in the figure, connect the
atomizer to the "Nebulizing outlet". Adjust it
to the right position, and wear it well.
④ Wear the oxygen inhaler
Wear the oxygen inhaler correctly as shown.
When using a Nasal cannula, align the two
vents with the nostrils and tighten the rubber
ring. 08

ON/OFF ⑥ Check the "Air filter"
Open the air inlet cover and check.
Make sure the air filter is clean and is
installed in place.
⑤ Start the oxygen machine
Turn on the "Power switch" and touch the
“ON/OFF” button, the machine will start to
produce oxygen.
※Please adjust the oxygen concentration to the appropriate gear
according to your own conditions. The recommended oxygen
concentration: 70%~90% for special people (if not recommended
by a doctor, do not inhale high concentrations of oxygen); 50%~70%
for the elderly and pregnant women; 30%~50% for office workers
and students. Please consult a physician for specific use.
09

8. Instructions for the Panel
Introduction to the display
Function buttons
1. Oxygen concentration
2. Timing & Total running time
3. Oxygen flow rate
Turn on the power switch, the display will show the total operating time
and enter the standby state.
ON/OFF
Gently touch the "ON/OFF" key, and the machine will start making
oxygen. The oxygen concentration value on the screen will gradually rise
to the corresponding value of the selected flow gear.
Flow button
Press the "Flow" button to adjust the oxygen concentration to your
prescribed level; the greater the gas flow, the lower the oxygen concentra-
tion. There are seven flow levels: 1 liter, 2 liters, 3 liters, 4 liters, 5 liters, 6
liters, and 7 liters. The corresponding oxygen concentration percentages
are 90%, 60%, 45%, 40%, 35%, 30%, and 28%. Default flow rate in the
power off state is 1L. When the system is rebooted in standby mode, the
flow value set before will retain. 10mins1
L/min
2
3
4
5
6
7

9. Instructions for the Remote Control
"Timing" button
Touch the "Timing button" to adjust the timing. Each time you press, the
duration increases by 15 minutes; the maximum duration is 180 minutes.
After 3 seconds of no operation, the timer starts to count down.
"Timing" button on remote control: The duration increases or decreases
by 15 minutes after each press.
Sleep mode
Press "SLEEP" when in the working state, the icon will flash 3 times, and
the display will enter sleep mode and shut off. Press any function key on
the remote control or on the panel to wake up the display.
1. Turn on/off
2. Flow plus
3. Flow minus
4. Timing plus
5. Timing minus
6. Sleep mode
7. One click for help
（Only for NT-4/VH03 model）11ON/OFF
SLEEP
FLOW-
FLOW+
SOS
TIME+
TIME-

10. Specific Functions
SOS voice
Press the "SOS" button when in the standby or working state, there will be
a voice broadcast of "I need help" to help the user ask for help. The voice
will not stop until you press the "SOS" button again.
※Operation of the rest buttons are the same as the corresponding
function buttons on the host machine.
Power saving mode
In the working state, the display, in the absence of operation for a minute,
will enter the power saving mode with the display brightness reduced,
making your life more eco-friendly.
Sleep mode (Only for NT-4/VH03 model)
In the working state, press the "sleep mode" button on the remote control,
the display will shut off to create a better sleeping environment for you.
Cumulative timing
The machine is designed with the function of recording the total running
time. After working for one hour, the cumulative time value on the panel
will increase by "1".
Self-checking function
This machine has a self-checking function. It helps you find out where and
the fault is.
Fault detection of cooling fan: If the cooling fan fails during the use of the
machine, the display screen will display the fault code "E1", accompanied
by a buzzer alarm.
SOS voice (NT-4/VH03 model only)
Press to broadcast "I need help" , which will not stop until you press the
button again, to help the user ask for help.
※To use this function, please keep the host machine powered on and the
remote control fully charged. 12

11. Maintenance and Repair
Clean the shell
The shell surface should be cleaned at least once a month. Cut off the
power supply and wipe it with a clean, soft, slightly wet cloth soaked in
disinfectant. Prevent the liquid from seeping into the interior of the
machine.
Clean or replace filter and filter pad
The white air filter at the back of the machine can reduce noise, keep the
dust out and purify air. Timely cleaning and replacement of the filter are of
great importance to protect the compressor and molecular sieve and
prolong the service life of the machine. So please clean or replace it in
time.
Do not operate the oxygen concentrator when the filter and filter pad
are not installed or are wet, which could cause permanent damage to the
machine.
Generally, filters and filter pads shall be cleaned or replaced every 100
hours.
Use of atomization function (NT-4/VH03 model)
1. Unscrew the nut on atomizing port anticlockwise before starting the
machine.
2. Connect one terminal of the Atomizing tube to the atomizing port.
Please use it as needed or under the guidance of a professional doctor,
and wear it as required.
3. Turn on the machine, press “ON/OFF” and confirm the gear is set to 1L,
and then the oxygen machine will be switched to atomization purpose.
※When the atomization is finished, press "ON/OFF" key to shut down the
machine. Remove the atomizer connecting pipe and install the atomiza-
tion port nut back in place and tighten it.
13

▲ Disassembly: Pull out the air inlet cover outward from the back of the
machine to remove the filter.
Whether to clean or replace the filter and filter cotton shall be determined
according to the actual use conditions. If the filter is dirty or clogged, it
should be cleaned or replaced immediately regardless of the using time.
Note: Filters and filter pads are consumables and need to be replaced
regularly.
▲ Cleaning: Clean with diluted detergent first and rinse with water. Install
it on the machine after it is completely dry.
Clean the oxygen inhaler and atomization components
Cleaning should be done after each use. The nasal suction heads on the
nasal cannula should be cleaned and disinfected after each use. Soak in
5% potassium permanganate solution for 5 minutes, and then clean it with
clean water; or wipe it with alcohol.
Fuse replacement
Unplug the power, use a slot screwdriver to pry open the fuse cap (as
shown in the diagram), remove the invalid glass fuse, and then install a
new one. Put the fuse cover back in place and tighten it.
14Air inlet cap
Filter
Filter cotton

Long-term idle
Make the following preparations if the machine shall be in long-term idle.
1. Cut off the power supply and put away the power cord.
2. Store the machine in a dry environment at room temperature. Do not
bend the tube.
3. Avoid direct sunlight and pollution.
4. Place the machine out of reach of infants and children.
Make the following preparations before using the machine which has
been in long-term idle.
1. Check the power cord for normal use.
2. Clean the oxygen tube and inhaler to avoid clogging or bending.
15Prize up the fuse cover with
a small slotted screwdriver
Remove the damaged fuse
Spare part
During use
Install a valid fuse
Install the fuse cover

12. Trouble Shooting
※If the machine does not operate normally after following the above
methods, please call the customer service hotline for advice. Do not
disassemble the machine. 16No. Problems
Odor in the air stream When the machine is used for the first
several times, the connection tube and
other plastic parts will emit a smell,
which is normal.
This odor is a normal smell emitted by
silicone tubes and ABS plastic parts. It
has been tested to be non-toxic and
harmless. With the use of the machine,
it will gradually disappear.
The machine makes a
chuffing sound every few
seconds.
The machine runs normally
after starting up, but the flow
rate is small.
After powering on, the
indicator light is normal, but
the machine fails to work
properly (abnormal working
sound )
This is the sound of nitrogen discharge
when the machine is normal, which is
a sign of the good operation of the machine.
Low flow rate has been set. Turn up the level of flow rate.
Tube is twisted or blocked. Straighten the tube.
The connecting tube inside the machine
is disconnected or broken.
Disconnect the power supply and have it
repaired by professional maintenance
personnel.
Compressor failure Disconnect the power supply and have it
repaired by professional maintenance
personnel.
Ambient temperature is too high.
Self-protection program of the oil-free
compressor is activated.
The connecting tube inside the machine
is disconnected or broken.
This is a normal phenomenon. The
machine will restart automatically when
the temperature lowers down.
Disconnect the power supply and have it
repaired by professional maintenance
personnel.
Possible causes Solutions
1
2
3
4

▲ The date of production can be found printed on the product label.
General service life is five years (excluding consumables, such as
atomization accessories, oxygen tubes, etc.).
▲ The disposal of waste shall be carried out in accordance with
relevant laws and regulations of the state or local governments.
▲ Pictures in this user manual and on other printed materials are for
illustration purposes only, the actual product shall prevail.
▲ The company reserves the right to change the product technology and
appearance at any time. Subject to change without prior notice.
13. Other Matters 17Certificate of Conformance
Product Name:
Model Number:
Test Date:
Inspector:
Oxygen Concentrator
NT-4/VH03

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