A.O. Smith Z2 User manual

Size: A5 [148.5 mm (W) x 210 mm (H)]
Part No.: 333892-000_R0
Date: 21-12-2015
USER GUIDE
Water Purifier
www.aosmithindia.com
EXPERT COMPANY SERVICE
Toll Free No.: 1800-103-2468 or
SMS us: [phone] or
E-mail us: [email protected]
Monday to Friday: 9 am to 8 pm.
Saturday & Sunday: 9 am to 6 pm.
#For calls registered at A. O. Smith call centre before 4 pm only.
For more details please call our Toll Free No. 1800-103-2468
or log on to www.aosmithindia.com.
SUPERIOR TECHNOLOGY FOR ADVANCED PROTECTION.

Dear Customer,
Congratulations and welcome to A. O. Smith family.
We thank you for the trust you have shown in choosing the A. O. Smith water purifier.
A. O. Smith water purifier is one of the most advanced RO water purifier available in the
market today. It is specially designed keeping in mind today’s water quality and your
needs.
Millions of customers all over the world trust A. O. Smith Products for their quality
and workmanship.
Our customer-centric approach manifests itself in many other ways too. If you need any
information or assistance with your water purifier, just call us from any phone,
anywhere in the country to our Toll Free Customer Care No. 1800-103-2468.
Please go through this simple and easy to read instruction and installation manual to
get the best out of your A. O. Smith RO water purifier.
We once again thank you for choosing A. O. Smith.
Yours Sincerely,
Team A. O. Smith

Contents
Key Features of your A. O. Smith RO water purifier............................................ 01
Pre-instruction literature .......................................................................................... 02
General instructions ................................................................................................. 03
Introduction ............................................................................................................. 04
Water flow ............................................................................................................... 07
Electrical diagram..................................................................................................... 07
Safety precautions.................................................................................................... 08
How to use............................................................................................................... 10
Troubleshooting....................................................................................................... 11
Technical specifications ............................................................................................ 13
FAQs......................................................................................................................... 15
Warranty terms and conditions................................................................................ 17
Warranty card .......................................................................................................... 21
Service and maintenance ......................................................................................... 22
Disclaimer ................................................................................................................ 23
What’s in the box?
User Guide Mounting Accessories Tube & ConnectorsWater Purifier

Key Features of your A. O. Smith RO water purifier
01
ADVANCE ALERT TECHNOLOGY
For Sediment + Pre Carbon filter and RO membrane + Silver Activated Post Carbon
filter change.
ADVANCED PRE-FILTER & SEDIMENT FILTER
For effective removal of suspended solids and sediment from water and to ensure
better life of RO membrane.
ADVANCED PATENTED SSM TECHNOLOGY (SIDE STREAM RO MEMBRANE)
Suitable for water with low and high (upto 2000 ppm) TDS. Wastes less water and
improves pure water recovery.
PURITY THROUGH 5 STAGE PURIFICATION
5S TECHNOLOGY: Pre-filter + Sediment filter + Pre Carbon filter + Patented Side
Stream RO Membrane + Silver Activated Post Carbon filter. In A. O. Smith RO
water purifier 100% water passes through the RO membrane.
STORAGE CAPACITY
Purified water storage capacity of 5 litres.
DIGITAL
Digital display for simple and intelligent display of information.
GOOSENECK FAUCET
Swivel faucet for user convenience.
WQA CERTIFIED RO MEMBRANE
RO Membrane element in A. O. Smith RO water purifier is tested and certified
by WQA against NSF/ANSI 58 standards for material requirements.

On Receipt
It is our policy to promote safe delivery of all orders. This product shipment has been
thoroughly checked, packed and quality certified before leaving our plant.
Visible Loss or Damage
If any of the goods called for on the bill of lading or express receipt are damaged or the
quantity is short, do not accept them until the freight or express delivery agent makes an
appropriate notation on your freight bill or receipt.
Concealed Loss or Damage
When a shipment has been delivered to you in apparent good condition, but upon
opening the crate or container, loss or damage has taken place while in transit, inform
the carrier’s agent / A. O. Smith representative immediately.
About this Manual
This manual is a guide to good practice for operating and periodic maintenance of the
A. O. Smith Under Sink RO water purifier.
This does not contain the full servicing procedures necessary for continued successful
operation of this product. The services of A. O. Smith Company authorised service
technician must be employed periodically on the same.
Do not operate before reading manual supplied with this product.
Please follow instructions in this manual to ensure personal safety and proper operation
of this product. A. O. Smith assumes no liability for installation or servicing performed by
any unauthorised personnel. Always install, operate, inspect and maintain this product in
accordance with all applicable standards. Please store this user manual carefully for any
future reference.
Pre-instruction Literature
02

These instructions have been written as a guide for the proper installation and operation
of your A. O. Smith Under Sink RO water purifier. A. O. Smith will not accept any
liability where these instructions have not been followed. However, for your safety and
to avoid damage caused by improper installation, it is recommended that water purifier
must be installed by A. O. Smith Company authorised service technician only.
Before proceeding with the installation instructions:
1. Inspect the A. O. Smith Under Sink RO water purifier and its component parts
for possible damage. DO NOT install or attempt to repair any damaged component
parts. If you detect any damage in your A. O. Smith Under Sink RO water
purifier please contact the company through Customer care centre, details of which
are mentioned in this manual and on the product.
2. Verify that the voltage being supplied corresponds to that which is mentioned in the
A. O. Smith Under Sink RO water purifier manual.
IMPORTANT
Safety
Your safety and the safety of your loved ones is paramount to us. There are several
safety related messages in this manual, which have been provided during various stages
such as installation, operation and maintenance of your A. O. Smith Under Sink RO
water purifier. These messages point out potential hazards and also educate on how to
reduce any potential risks. Please always read and follow all safety messages as provided
in this manual.
General Instructions
03
This is the safety alert symbol. This symbol alerts you to potential
hazards that can hurt you and others. All safety messages will follow the
safety alert symbol and either the word “DANGER” or “WARNING”.
Indicates an imminently hazardous situation which, if not avoided, will
result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury or property damage.
DANGER
CAUTION
WARNING

Introduction
04
Stage 4 – RO (Reverse Osmosis) membrane
RO membrane contains semi-permeable membrane wherein the water is passed
through the semi-permeable membrane to remove TDS (Total Dissolved Solids) and
heavy metals like mercury, arsenic, lead, chromium, cadmium etc. It also removes
microorganisms like bacteria, virus, protozoa and cysts.
Stage 5 –
Silver Activated Post Carbon
Water is passed through Silver Activated Post Carbon which acts as polisher and
enhances the taste of water.
A. O. Smith Under Sink RO water purifier uses one of the latest technologies that
is used in water purification process. A. O. Smith Under Sink RO water purifier
works under the principle of RO (Reverse Osmosis) technology which is found to be
one of the most effective process. In this process water under pressure is passed
through a semi-permeable membrane. Purified water is collected for drinking in a
storage tank and impurities in the water are flushed to the drain.
Why water purification is important?
Water purification, today is essential due to the presence of harmful contaminants
present in the water supply. Rapid urbanisation and speedy industrial growth have led to
significant pollutants and contaminants being found in the water supply. Below is a list of
some of the harmful contaminants found today in the water supply which if consumed in
excess can be detrimental to human health.
• TDS (Total Dissolved Solids) like Nitrates, Chlorides, Sulphates etc.
• Pesticides and VOC (Volatile Organic Compounds).
• Heavy metals like Mercury, Arsenic, Lead, Chromium, Cadmium etc.
• Microorganisms such as pathogenic bacteria, virus, protozoa and cysts.
A. O. Smith Under Sink RO water purifier removes excessive TDS (Total Dissolved
Solids) in water by more than 95%. A. O. Smith Under Sink RO water purifier reduces
heavy metals and removes pathogens. By this, it ensures you safe and great tasting water.
A.O. Smith Under Sink RO water purifier has 5 stages of purification system, wherein
the water is passed through the various stages and progressively filtered to get purified
water which is stored in the inbuilt storage tank.
 Stage 1 – Pre-filter
The Pre-filter is used to remove physical contaminants such as dirt, dust, soil
particles, turbidity present in the water. This improves the life of the Sediment filter.
 Stage 2 – Sediment filter
The Sediment filter is used to remove fine and coarse physical contaminants present
in the water. This improves life of the Pre Carbon filter and ensures efficient working
of RO membrane.
 Stage 3 – Pre Carbon filter
The Pre Carbon filter uses carbon block with high adsorbtion capacity which reduces
harmful chemicals including pesticides, volatile organic compounds, residual chlorine
etc., from water. It also adsorbs bad taste and odour causing organic compounds
from water.
How does the A. O. Smith Under Sink RO water purifier work?

Figure 1
05
Stage 4 – RO (Reverse Osmosis) membrane
RO membrane contains semi-permeable membrane wherein the water is passed
through the semi-permeable membrane to remove TDS (Total Dissolved Solids) and
heavy metals like mercury, arsenic, lead, chromium, cadmium etc. It also removes
microorganisms like bacteria, virus, protozoa and cysts.
Stage 5 –
Silver Activated Post Carbon
Water is passed through Silver Activated Post Carbon which acts as polisher and
enhances the taste of water.
Note: The Pre-filter, Ball valve and Gooseneck faucet comes along with the product as
standard accessories.
1
3
5
2
12
3
4
8
To drain
7
6
5
LED Display Panel Indicators
1
3 5
2
Installation Overview
Part Description
1 Normal water supply
2 Hot water supply
3 Ball valve
4 Under Sink water purifier
5 LED display panel indicators
6 Pre-filter
7 Power adapter
8 Gooseneck faucet

06
This indicates that the purifier is functioning in normal condition.
Work indicator
When the water pressure is lower than required water pressure limits, this indicator
will start to blink continuously and the buzzer beeps for 8 times until the water
pressure becomes normal.
Source indicator
This indicates that the water purifier tank is full.
Tank full indicator
RO change indicator
This indicates that RO membrane needs to be replaced.
• RO change indicator glows when 5% life is remaining and buzzer beeps for 4 times,
indicating that it is time to replace RO membrane.
• When RO membrane life reaches its end, this indicator will start to blink continuously
and the buzzer beeps for 8 times indicating that RO membrane needs to be replaced.
Note: Call A. O. Smith Customer care centre to replace RO membrane.
Note: Call A. O. Smith Customer care centre if you notice continuous blinking of Source indicator.
Note: Call A. O. Smith Customer care centre to replace the respective filter.
Filter status indicator
This indicates the status of the Sediment filter , Pre Carbon filter and Silver
Activated Post Carbon .
• When the filter status indicator is green, it indicates that these filters are functioning
normal.
• Filter status indicator changes to orange when 5% life is remaining and buzzer beeps
for 4 times, indicating that it is time to replace respective filter.
• When the filter life reaches its end, this indicator changes to red and the buzzer
beeps for 8 times indicating that respective filter needs to be replaced.
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3 5
2
3
5
2

07
Water flow
Electrical Diagram
Figure 2
Figure 3
Faucet
Storage
Tank
Silver
Activated
Post Carbon
High
Pressure
switch
Check
valve
Low
Pressure
Switch
Pump Flow
Restrictor
RO
Tap
water Pre-filter Sediment
filter
Pre Carbon
Ball
Valve
Inlet water
3-way joint
Flush
Solenoid
valve
Inlet
Solenoid
valve
Waste
Water
Pure
Water
Low Pressure
Switch
High Pressure
Switch
SMPS
Pump and
Inlet SV
Flush
SV
Display
PCB
Water
Leakage
PCB
150V - 300V
50 Hz
1- φAC supply
P
N
Driver Board
24V DC
GND

08
Safety Precautions
Electrical Safety
Even though the product is designed keeping highest safety standards in mind, there are
certain Do’s and Dont’s which need to be followed while using this product.
Figure 4
Power plug must be used with a
grounded 230V outlet. It is recommended
to connect the product to the power
supply only with the plug that is provided
with the purifier. (Figure 4)
230V
CAUTION
Figure 5
Install the product away from direct
sunlight. It is recommended to install the
product under the sink only. (Figure 5)
Do not pull out or touch power plug with
wet hands to avoid electrical shock.
(Figure 6)
Figure 6
DANGER
Product should be installed only by
A. O. Smith Company authorised service
technician. (Figure 7)
Figure 7
CAUTION

09
Do not connect hot water supply to the
purifier. Make sure that the inlet water
temperature to the purifier should be
between 5°C to 45°C. (Figure 8)
Figure 8
Do not open the purifier for cleaning the
filters or for any part replacements. This
must be done only by A. O. Smith
Company authorised service technician.
(Figure 10)
Figure 10
Figure 9
Do not use the purifier if the power cord
is damaged or you notice strange noise,
burning smell or smoke. Switch off the
power, unplug the power cord
immediately and call Customer care
centre. (Figure 9)
Figure 11
Do not place any chemicals, thinner, soap
or any other cleaning items on the
product. (Figure 11)
CAUTION
Hot water
supply
CAUTION
CAUTION
CAUTION

10
How to use
Figure 12
Figure 14
Figure 13
Step 1 Step 2
Note:
• Discard the first cycle of pure water, before you start using it for consumption.
• Make sure to discard the water from the storage tank if you have not used the
purifier for more than 2 days.
Turn ON the water connection through
the ball valve. (Figure 12)
Step 3
To dispense water from the storage tank,
turn the faucet knob in anti-clockwise
direction. (Figure 14)
Switch ON the power supply. (Figure 13)
Faucet
knob

11
Troubleshooting
Your A.O. Smith Under Sink RO water purifier may not function at its desired
capability if used incorrectly. This may not necessarily mean that the product is faulty. For
instances like these, please follow the steps given below to troubleshoot the problem
without the help from a certified technician. If the problem still persists, please call the
Customer care centre immediately.
Problems Check-up Solution
Change in water taste. Has the purified water Drain the stored water
been stored in the tank from the storage tank
for long time? through faucet.
Filters / Membrane may Call Customer care centre
require replacement. for replacement.
Has the raw water quality Call Customer care centre.
changed?
Check if there is no water Switch OFF the water
flow through reject line. purifier and call Customer
care centre.
Decreased flow of Check whether the Open the tap / ball valve.
purified water. tap / ball valve is closed.
Filters / Membrane may be Call Customer care centre
clogged or damaged. for replacement.
Less / No reject water. Check if the reject water Clear the bent in the
tube is bent. reject water tube.
Check if the reject water Switch OFF the water
tube is blocked. purifier and call Customer
care centre.
Flow restrictor blocked. Switch OFF the water
purifier and Call Customer
care centre.
Less / No pure water. Check whether there is If not, take the help of a
water supply in the tap. plumber to set it right.
Check whether tap / ball Open the tap / ball valve.
valve is closed.
Water is completely drawn Wait until the storage tank
from the storage tank. gets filled.
None of the above. Call Customer care centre.

12
Buzzer beeps and all Water leak alarm is Switch OFF the water
indicators blinks triggered indicating purifier and call Customer
continuously. that there is a leakage care centre.
inside the purifier.
Buzzer beeps for 8 times Low pressure alarm is Check feed water supply
and source indicator blinks triggered indicating that the to the purifier. If problem
continuously. system input water pressure still persists, switch OFF
is not in the required range. the water purifier and call
Customer care centre.
Buzzer beeps for 8 times RO change alarm is Call Customer care centre
and RO change indicator triggered indicating that for RO membrane
blinks. the RO membrane needs replacement.
to be replaced.
Buzzer beeps for 8 times Filter status alarm is Call Customer care centre
and filter status indicator triggered indicating that the for filters replacement.
changes to red. filters need to be replaced.
Filter status indicator Filter status indicator glows Call Customer care centre
changes to orange and when 5% life is remaining for filters replacement.
buzzer beeps for 4 times. and filter status alarm is
triggered indicating that it
is time to replace filters.
RO change indicator glows RO change indicator glows Call Customer care centre
and buzzer beeps for when 5% life is remaining for RO membrane
4 times. and RO change alarm is replacement.
triggered indicating that it
is time to replace
RO membrane.
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53
2
53
2
53
2
53
2
53

13
Technical Specifications
Model A.O. Smith Under Sink RO
Product Dimensions (H x D x W) 420mm x 410mm x 270mm
Net Weight 11 kgs (approx.)
Gross Weight 13.5 kgs (approx.)
Flow rate* Upto 15 litres per hour
Storage tank capacity†5 litres (approx.)
Purification technology RO (Reverse Osmosis)
5 Stage Purifying Technology Pre-filter + Sediment filter + Pre Carbon
filter + Side Stream RO membrane and +
Silver Activated Post Carbon
Membrane type Thin film composite RO membrane
Material of construction for plastic Food safe, non-toxic, engineering grade
parts plastics
Pump type Diaphragm pump, 24VDC, 0.26 Amps,
Operating Pressure 125 psi (Max.)
Input Voltage 150 – 300 VAC, 50 Hz
Power rating (Max) 48 Watts
Pressure Rating*** 7 psi to 30 psi
% Recovery** Up to 30%
TDS reduction** ≥95% (approx.)
Input water temperature 5°C to 45°C
* Flow rate depends on variable factors such as feed water pressure, feed water
characteristics and condition of the membranes and filters.
** Recovery and TDS reduction percentages also depend on variable factors such as life and
condition of the membranes and filters, feed water pressure, feed water characteristics.
*** If input pressure exceeds 30 psi, a pressure reducing valve needs to be installed at the
feed line. If the pressure is lower than 7 psi, a booster pump needs to be installed.
Ensure you buy them from A. O. Smith Company authorised service technician.
†
Storage tank capacity depends on the storage tank bladder pressure.

14
Parameter Limits
Total Dissolved Solids (TDS) Up to 2000 ppm
Total hardness Up to 500 ppm
Turbidity Up to 5 NTU
Iron 0.3 ppm (max.)
Feed water pressure 7 psi to 30 psi
Feed water temperature 5°C to 45°C
RECOMMENDED FEED WATER QUALITY
Recommended input Feed water quality for the optimum
performance of your product
Warranty details/Recommended filter change:
Pre-filter change:
The Pre-filter needs to be replaced at 200 hrs or approximately after 2,500 litres
of purified water. Depending on the quality of the feed water the Pre-filter may
even be changed earlier than 200 hrs.
Sediment and Pre Carbon filters change:
The Sediment and Pre Carbon filters need to be replaced at 200 hrs or
approximately after 2,500 litres of purified water.
Silver Activated Post Carbon filter change:
Silver Activated Post Carbon filter needs to be replaced at 400 hrs or
approximately 6,000 litres of purified water.
RO Membrane change:
As per the warranty, the RO membrane needs to be replaced at 400 hrs
(approximately 6,000 litres purified water) or 800 hrs (approximately 12,000 litres
purified water) depending on the quality of the feed water.
Note: Please go through detailed warranty terms and conditions mentioned on Page No. 17 to 20.

15
FAQs
1. What is A. O. Smith Under Sink RO water purifier?
A. O. Smith Under Sink RO water purifier is advanced 5 stages RO from
A. O. Smith. It is 100% RO with no bypass of water for maximum purity.
2. What is 100% RO?
In ordinary RO+UV water purifiers, some amount of water is made to bypass the
RO membrane. With this, heavy metals, unwanted salts and pesticides also pass
through. In A. O. Smith Under Sink RO water purifier, 100% of the water is
passed through the RO membrane which ensures maximum purity of water.
3. How many stages A. O. Smith Under Sink RO has? And what are the
stages?
A. O. Smith Under Sink RO water purifier has 5 stages of purification which are
Pre-filter + Sediment filter + Pre Carbon filter + RO Membrane + Silver Activated
Post Carbon.
4. What is the storage capacity in the A. O. Smith Under Sink RO water
purifier?
The storage capacity in the A. O. Smith Under Sink RO water purifier is 5 litres
of pure water.
5. What is the purification flow rate of A. O. Smith Under Sink RO water
purifier?
Up to 15 litres per hour, purification capacity also depends on water quality,
condition of filters, storage tank bladder pressure and RO membrane.
6. Does the A. O. Smith Under Sink RO water purifier have service or filter
change alerts?
Yes, the A. O. Smith Under Sink RO water purifier has an alert system
technology which indicates when to change the Sediment filter, the Pre Carbon
filter and the
Silver Activated Post Carbon .
7. Does the A. O. Smith Under Sink RO water purifier come with a Pre-filter?
Yes, A. O. Smith Under Sink RO water purifier comes with a Pre-filter which is
part of the product.
8. When does the A. O. Smith Under Sink RO water purifier indicate a filter
change?
The first notification is indicated when the consumption of the filter life is at 95%.
When the filter life consumption is at 100%, the filter status indicator changes to
red.
9. What is the nature of indication for the change in filter?
On the first intimation when the filter life is at 95% the respective filter indicator
changes to orange. On 100% filter life consumption, the respective filter indicator
changes to red.

16
10. What is the Advanced SSM technology? How is it different from other
technologies and what are its advantages?
The Advanced SSM is an abbreviation for the side stream RO membrane
technology. Unlike traditional membranes, this membrane has water inflow from
2 sides which results in better rejection of dissolved solids. It also results in higher
membrane life.
11. What is the average life of the Pre-filter, Sediment filter and Carbon filter?
The Pre-filter, Sediment filter and Carbon filter needs to be replaced at 200 hrs or
approximately after 2,500 litres of purified water. Depending on the feed water
quality, the Pre-filter may be changed even earlier than 200 hrs. Sediment filter &
Pre Crabon filter needs to be replaced at 200 hrs or approximately after 2,500 litres
of purified water. The Silver Activated Post Carbon filter needs to be replaced at
400 hrs or after 6,000 litres of purified water.