A.O. Smith aosbath MAX4 User manual

Instruction Manual
Domestic RO Water Purifier, MAX4

Do not disassemble or modify this system.
Do not expose the system to corrosive
substances.
Disconnect the system from power source
during installation and troubleshooting. Do
not touch power plug with wet hands.
Do not use a power supply that
exceeds the specifications of the
machine. Ensure the power cord
and socket are in good condition.
Do not cover the appliance with
a cloth.
Do not place the machine close
to a fire source.
The system must be connected
to a socket with a reliable
grounding.
Do not place heavy objects on the
product.
Do not place in an environment below
4ºC.
Do not place system outdoors or
under direct sunlight.
Do not place in areas of high
temperature and humidity
Do not use without a proper
drainage
The water temperature of this
product should not be higher
than 38ºC
1. IMPORTANT
Please read this manual carefully before using the product and store it for future reference.
If the user installs the water filter by themselves or does it by using the self-prepared installation materials, AOS
Bath will not be liable for any adverse effects on the normal operation and service performance of the system.
The maintenance of this appliance requires the use of approved parts and the problems caused by the use of
unauthorized parts (degradation of performance or property damage) are not covered by the manufacturer's
limited warranty. If any components require a change, consumers should contact the local authorised dealer.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge.
Warning
: Failure to follow these instructions may lead to risk of fire and could cause property damage and or
personal injury or death

2. PRODUCT INFORMATION
FEATURES
The water filter system is fully automated.
•Self cleaning internal flush function, activated each time system is powered on or reset.
•Automatically prompt users if a cartridge change is required.
•RFID anti-counterfeit cartridge with intelligent identification microchip.
•Flow protection: If water is released for 20 minutes consecutively, system assumes user has forgotten to turn
off the faucet and will cut off power for 60 minutes. Switch off the tap and reset system to resume normal
operation.
SPECIFICATIONS
The Company reserves the right to modify these specifications at any time.
Rated voltage / frequency
220V / 50 Hz
Electric shock protection category
Type 1
Water inlet pressure
0.1 ~ 0.35 MPa
Work pressure
0.4 ~ 0.8 MPa
Inlet water temperature
5 ~ 38ºC
Executive standard
Q/320124 AONJ 043-2018
A. O. Smith integrated reverse osmosis water purifier
Raw water source
Municipal tap water, compliant with GB5749-2006
Water quality compliance
Compliant with Sanitary Safety and Functional Evaluation Specification
for Drinking Water RO Treatment Equipment (2001)
Net weight
15.5 kg
Dimensions (L x W x H)
445 x 140 x 43 mm
Note: The purified water flow is affected by the inlet water pressure and temperature. The above specifications
are measured at inlet pressure 0.2MPa and inlet temperature of 25ºC.
The rated total purified water volume is tested in accordance with the requirements of the Drinking Water
Quality Hygiene Safety Specifications for Reverse Osmosis Treatment Devices (2001).
Model Purified water flow
rate
Rated total volume of
purified water Rated power Health permit approval number
MAX4 1.8L/min 7500L 107W (2019) 3200-0033

3. OPERATION GUIDE
2. Faucet Display
When the system is powered on, the faucet icon will light up.
The indicator light colour on the faucet syncs to the indicator light
on the system. If the display colour is orange or red, call the
service hotline to request for product maintenance
INSTRUCTIONS
Particle
filter
Carbon
filter
Reverse
Osmosis filter
1. System Display
The indicator lights correspond to the remaining
service life of each filter.
White
: Product and filter life is normal
Orange
: The filter life is down to 5%, order
replacement filters.
Red
: The filter life is down to 0%, replace filter
immediately.
Indicator light
PREPARATION BEFORE INSTALLATION
•Determine installation location, dependent on the actual on-site environment
•Determine various tools required for installation (wrench, electric drill, hole opener, screwdriver, pipe cutter,
needle-nose plier).
•Cut off water and electric supply before installation.
•Inventory check of all required installation accessories
4. INSTALLATION AND INITIAL SETUP
The system must be installed by an authorized personnel from AOS Bath as the system can only be
activated with unique activation codes from the manufacturer

2. Installation of water inlet pipe
Incoming water
Purified water
Waste water
Faucet power supply
1. Remove water pipe from the accessory box and cut
out an appropriate length with a pipe cutter.
2. Connect one end of the water pipe to the three-
way valve inlet and the other end to the incoming
water supply.
3. The water pipe and the quick-connect joint must be
secure to prevent water leakage.
1. Installation of metal hose and 3-way valve
1. Fix the water inlet valve at ‘close’ position and
unscrew the metal hose.
2. Attach the base end of the three-way valve to the
inlet valve.
3. Attach one end of the metal hose to the top of the
three-way valve. The metal hose connects to the
faucet.
Metal hose
Washer
Inlet valve
3-way valve
Washer
INSTALLATION OF HOSE, 3-WAY VALVE, WATER INLET

INSTALLATION OF FAUCET
Drill a hole of 20-30mm in diameter to begin the installation.
1. Base installation
1. Insert the power cord though the rubber pad
and gasket. The rubber washer and gasket are
designed to have protrusions that should align
well against each other and with the center hole.
2. Take out two M4 screws, and insert one screw
into the washer and gasket through the base
hole so that both can rotate flexibly.
3. Place the base above the table hole, ensure the
washers are in place and drive the second screw
into the table from the base hole.
4. When installing the water outlet, the base
should face the corner of the sink.
5. Tighten the two screws.
2. Installation of faucet body
1. Cut a water pipe of appropriate length. Insert one end into
the socket of the main body and the other end through the
base, beneath the countertop.
2. Connect with the water outlet of the water purifier.
3. Insert the main faucet body into the base.
3. Installation of goose neck faucet
1. Ensure the three O-rings of the gooseneck faucet are all in the
O-ring groove.
2. Immerse the end of the O-ring in water and insert it into the
spout of the main body to complete installation of the faucet.
Countertop
Screw
Base
Rubber
washer Gasket
Power cord
Goose neck
faucet
Handle
Base
Facet body

Tip: Before insertion of water pipe into the faucet body, draw a line 16mm away from the end of the water
pipe as a guide. After the water pipe is inserted, the marking line should not be visible.
To prevent internal damage, do not force the main body while it rotates into the base.
Note: When cleaning the surface of the faucet, use a soft sponge. Avoid metal sponges to prevent scratches
and damage. A faucet damaged in this manner will not be covered under the warranty.
INSTALLATION OF WASTE WATER PIPE
Installers are advised to use the waste water clamp.
Use a 3mm drill bit to make a small hole in the existing drain pipe and fix the waste water clamp to the hole.
Connect one end of a flexible water hose into the waste water clamp hole.
Align and fix the waste water clamp, connecting the 2-way waste water pipe with the small hole of the drain
pipe. Ensure the inserted portion of the 2-way water pipe does not exceed 1.5 cm.
Tip: Before insertion, coat the connection of the 2-way pipe and the drain pipe with a little silica gel.
FIXING THE SYSTEM
The reverse osmosis water purifier is not to be wall-mounted. It
should be placed directly on the cabinet floor. Should the unit need
to be fixed on the wall, the user must purchase a separate tripod and
expansion screws for a secure wall-installation.
POWER CORD CONNECTION
Connect the power adapter to the system and insert the power plug into the electric socket.
•Remove the foam from the packing box
•Place the foam on the bottom of the product, as shown in the figure.
INSTALLATION PRECAUTIONS
•At the bottom of the system there is a water pump. The four screws at the base of the pump should be
removed before the installation or an abnormal noise will sound.
•Use the provided pipe plugs to fix the water pipes. All screw caps should also be used.
•Use the new hose assembly provided with the appliance.
•If the system is installed correctly, you should be able to slot in and install the filters easily. If this is not so,
do not use force the filters in. The use of force may cause permanent damage to the circuit board and filter
microchip. This will not be covered by the warranty.

INITIAL SETUP
Proceed to activate the system after checking that the pipe connections are secure and that the system is
connected to a water source and power supply.
•Ensure the stop valve on the incoming water pipe is ‘on’. Turn on the filter faucet and wait for the first
flow of water. Allow some time for the water to pass through all filters. If there is no water flowing out of
the faucet, check if the incoming water pressure is too low.
•When the filter faucet has been running for about 10 minutes, check the body of the filter for any visible
leaks. Ensure all pipe and wire connections are secure.
•Close off the filter faucet and check to see if the flow of water at the waste water tube stops. The flow
should stop within 30 seconds.
INSTRUCTIONS BEFORE USE
•Before the water can be consumed, the system requires a thorough flush of the the Reverse Osmosis
filter. You can do this by letting the filter faucet run for 20 minutes every 2 hours, repeated 7 times.
Alternatively, let the faucet run for as long as possible on the first day of installation.
•Gas solubility increases as tap water passes through the high-pressure RO filtration process. As a result,
users may notice tiny bubbles in the pure water, similar to that of bubbles of carbonated drinks. Because
pure water has no impurities, it takes a long time for the bubbles to dissipate. This is a normal physical
phenomenon and is harmless to the human body.
•Switch off the filter faucet when not in use.
•Used filters cannot be cleaned and recycled. They should be disposed off as solid domestic waste.
•If product has not been in use for a long time, reset the system, disconnect and reconnect the water
source, and perform a thorough flush before you use resume use.
•Should any of the following situations occur, disconnect the water source immediately and power down
the system:
-Leak detected at any part of the main body or connecting pipes
-Any part of the system is malfunctioning
•Should any part of the system be damaged, seek professional assistance from an authorised A. O. Smith
retailer. The manufacturer is not responsible for any loss as a result of failure to operate the system in
accordance with the instructions in this manual.

5. MAINTENANCE
RECOMMENDED FILTER REPLACEMENT CYCLE
•The recommended filter replacement cycles of this water purifier are based on statistics of international
average indicator.
•Local water quality and water consumption will affect the lifespan of each filter.
•If you notice a fault of blockage of the filter, please contact the authorised after-sales service department
immediately.
•The filter lifespan is based on an estimation of ordinary household water consumption. The system is not
designed to be installed in public places of high or commercial water consumption.
Filter Particles removed Estimated filter life Model
Particle filter
Suspended solids, rust,
sand, silt, organic matter,
smells, prevents
crystallization of calcium
and magnesium ions in
filtration system.
12 months MT-4 ∅85mm
Carbon filter
Removes odors, chlorine,
chloramine and improves
taste.
12 months CMF ∅85mm
Reverse Osmosis (RO)
membrane filter
0.0001μm precision
filtration, removes viruses,
bacteria, trace metals,
heavy metal ions and
pesticide residue.
48 months TW-303-700/∅115mm
REPLACING THE FILTER
1. Do not disconnect power supply.
Remove front cover and wait 1 minute
for the system to depressurize. The light
display will flash in this minute.
2. When the display stops flashing, raise
the handle of the filter to a horizontal
position. You will hear a click. Proceed to
pull the filter out.

3. Remove packaging from the new filter
and insert it into the slot until you hear a
click.
4. When successfully installed, the
relevant filter indicator light display will
turn white. Proceed to close the cover,
aligning the magnets at the top first.
NOTE:
1. After replacing any of the filters, switch on the faucet and let the waterrun from the filter tap for 15
minutes before consuming the water.
1. If the filter indicator display does not light up in white, adjust the water purifier so that it is at least
2cm away from the sides of the housing cabinet. Then, remove the filter and reinstall it.
2. If the faucet stops dispensing water after any filter replacement, switch off the faucet and check that
the filter is properly connected.

6. INSTALLATION DIAGRAMS
WATERFLOW DIAGRAM
ELECTRICAL COMPONENTS
EXPLODED VIEW
Main circuit board
Controls the entire water filtration process
Inlet valve
Controls the incoming flow of water
Pressure pump
Regulates system pressure to create a stable
environment for the RO membrane to
filtration process.
3-way valve
Incoming water supply
Inlet valve
Waste water
Particle
filter
RO
filter
Carbon
filter
Faucet
Pressure pump
Combination & stop valve
Backflow valve
Main
circuit
board
Stop valve
Faucet
Pressure
pump
Inlet
valve
Combination
valve
Power
supply
220V 36V
Left cover
Front cover (fixed)
Display panel
Pressure pump
Water
pump cover Right cover
Front cover (removable)
Filter
Filter handle
Top cover Frame Filter circuit board and components
Waterflow components and valves
Back cover
Fixing plate
Circuit board
Flow stabilizer (pump outlet)

7. TROUBLESHOOTING
Malfunction Possible cause Solution
Unable to switch on Power is not connected Check the power supply or power plug
The water inlet is blocked, or power
supply is disconnected
Check incoming water supply and water
pressure
Wires are damaged Replace wires
Circuit board faulty Replace circuit board
The front cover is not installed
correctly.
Close the cover, taking care to align the
magnets at the top first.
The faucet does not
produce water
The pressure pump is faulty Replace the pressure pump
The water inlet is faulty Replace the water inlet
One of the filters is at 0% life Replace the relevant filter
Filters are not properly installed Reinstall the filters
The main circuit board cannot shut off
the inlet valve
Check the inlet valve and replace if
necessary
Waste water is
released even when
faucet is off
The inlet valve is malfunctioning Replace the inlet valve
No or low flow of
purified water
Filters are at 0% life Replace the filters
Filters are blocked Reinstall the affected filters
Inlet valve is preventing incoming water
flow
Check if inlet valve is working, replace if
necessary.
Insufficient pressure in the system If waste water flows normally, the fault
lies with the inlet valve
Water inlet is clogged Clean or replace the water inlet
Faucet has no light
display
Connection to main circuit board not
secure
Check circuit board connection
Faucet display faulty Replace the faucet

8. WARRANTY AND PACKING LIST
WARRANTY
AOS Bath Pte Ltd (the warrantor) will cover defects or manufacturing faults of the AOS water purifier with
components or models of equivalent size and compatibility. The warranty covers all components and labour
charges for replacement of faulty parts for 1 year from date of installation. The water purifier is designed for
household use and the warranty will not apply should the system have been used for commercial purposes.
The warranty is valid only in Singapore.
This warranty shall apply only when the system
•Is owned by the original purchaser;
•Is properly maintained by the owner
•Is correctly installed in accordance to the AOS instruction manual;
•Has a serial number that is not altered or removed;
•Is installed indoors
•Is installed by a qualified installation team with no modifications to its design in any way
•Is accessible
•Is not subject to accidental damage or faults caused by negligence;
•Is not subject to damage from external sources such as transit, weather or power surges.
SERVICE AND LABOUR
After the 1st year of warranty, the owner is responsible for all other costs. Such costs may include but are
not limited to labour charges for service, removal or reinstallation of the system and delivery, handling and
administrative charges.
WARRANTY SERVICE PROCEDURE
Please register the product online within 7 days of installation. For assistance, please contact AOS Bath Pte
Ltd at 68420030.
•Proof of purchase and installation date are required to support a warranty claim from the original owner.
Please keep your purchase receipt in a safe place to ensure you have this information.
•In the event of a system malfunction, disconnect the water source, cut off the power immediately and
contact customer service at 68420030.
PACKING LIST
•Water purifier
•Particle filter MT-4 (1pc), carbon filter CMF (1pc), RO filter (1pc)
•Power adaptor
•Accessory kit
•Installation manual
•Faucet
•Several water pipes

Parts Harmful Substance
Lead
(Pb)
Mercury
(Hg)
Cadmium
(Cd)
Hexavalent
Chromium
(Cr(VI))
Polybrominated
Biphenyls (PBB)
Polybrominated
Diphenyl Ether
(PBDE)
Filter
components
o o o o o o
Metallic parts o o o o o o
Plastic parts o o o o o o
Rubber parts o o o o o o
Electronic
assembly
(device)
x o x o o o
Label printing
materials
o o o o o o
Remarks: Measured here are the mercury, lead, cadmium, and chromium (VI) precipitation of the water
samples and samples of the whole system after being soaked in pure water for 24. They are in compliance
with the Ministry of Health's "Drinking Water Quality Processor Hygienic Safety and Functional Evaluation
Specification for Anti-permeation Treatment Devices" (2001) and the requirements in GB5749-2006.
HAZARDOUS SUBSTANCES (CONTENTS)
Marked ‘o’: The content of the hazardous substances in all materials of the part is below the limit
requirement specified in GB/T 26572
Marked ‘x’: The content of the hazardous substances in at least one of the materials of the part exceeds the
limit requirement of GB/T 26572. The “x” parts are not in contact with water and comply with EU ROHS
requirements.

AOS Bath Service Hotline
68420030
For filter replacements
68420030
AOS Bath Pte Ltd
178 Paya Lebar Road #06-11, Singapore 409030
ww.aosbath.com