A.O. Smith EWS 6 User manual

EWS: Available in 6 to 25 litre capacities
Guaranteed Service
within 24 hours.
Call: 1800.103.2468
Blue Diamond
Glass-Lined Tanks.
Glass Coated Elements.
Colour Options.
Saves time.
Saves energy.
Saves money.
Heating technology
that will always give
you hot water…
Guaranteed!
Our new innovative
solutions are often
copied but never
equalled.
American technology
that ensures you have
a water heater that
works in Indian water
conditions.
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User Guide

Electric
Water Heater
What's in the box?
Wall Mounting
Accessory
Drain Pipe
Safety Valve
TM
A. O. Smith ColourMatch System
TM
A.O. Smith ColourMatch System allows you to match your water heater to the colour of your
bathroom.
Call the A. O. Smith Customer Care Centre [1.800.103.2468] to order one of the decorative front panel
colour options, and we will have it delivered to you free of charge.
The product in the box comes in either white or ivory
with a front panel of the same colour. You have the
option of changing this panel to match
the colour of your bathroom.
User
Guide

Dear Customer,
Congratulations! You have bought a world-class water heater from A. O. Smith Water Products Company, the largest
water heater manufacturer in North America. A division of A. O. Smith Corporation, it is a global leader in innovative
technology and energy efficient solutions.
Our customer-centric approach manifests in many ways. Ours is the only water heater company which provides you
with a dedicated Toll Free Customer Care Helpline from any phone - for convenience at your doorstep. We offer you a
wide range of colour options in front panels to match your bathroom décor.
Our many firsts in India
¢Ours is the only water heater manufacturing company in India using Glass Lining Technology.
¢We are also the only water heater company in India, and in the world, to offer the patented Blue Diamond
Technology for the Inner Tank which extends the life of the tank.
¢We offer you the widest range of colour options in decorative front panels to match the décor of your bathroom.
¢Ours is the only water heater company offering you a Toll Free Customer Care Helpline 1.800.103.2468 from
any phone.
¢A. O. Smith is the first company in India to offer a 4 year warranty on the glass coated heating element.
We look forward to a long and happy association in the years to come. Just follow the instructions in our User Guide
carefully and you will enjoy years of trouble-free performance. If you need any assistance, we will be right there, at
your doorstep.
For any assistance, kindly contact our Local Officer. We have a dedicated 24x7 A. O. Smith Toll Free Customer Care
Helpline 1.800.103.2468.
OR
Factory Address:
A. O. Smith India Water Heating Private Limited
Plot Number-300, Phase-2, KIADB Industrial Area, Taluka Kanakpura,
District Ramanagaram - 562 112, Karnataka State, India.
Kindly follow the instructions in this User Guide carefully and enjoy years of trouble free performance.

Contents
Specifications.................................................................2
Key Features...................................................................3
Glass Coated Element
Blue Diamond Glass Lining
Anode Rod Protection
Safety Valve
Thermal Cutout
Installation
Mounting........................................................................4
Plumbing ........................................................................4
Electrical Connections .......................................................5
Water Filling ....................................................................5
Operation Instructions.................................................5
Maintenance and Cleaning.........................................6
Changing the Decorative Front Panel.......................6
Troubleshooting ............................................................7
Circuit Diagram .............................................................7
Warranty
Terms and Conditions .......................................................8
General Terms of Warranty ................................................9
Post Warranty ..................................................................9
Warranty Card
Customer copy and Company copy ..................................10
Service and Maintenance..........................................12
1

2
Specifications
Dimensions and Parts
1 Outlet
2 Inlet
3 Safety Valve
4 Thermostat Knob
5 Decorative Front Panel
6 Front Jacket
7 Back Jacket
8 Anode
9 Heating Element
10 Tank
11 Installation Bracket
12 PU Insulation
13 Thermal Cutout
Part Descriptors
Model EWS-6 EWS-10 EWS-15 EWS-25
A [mm] 317 373 373 444
B1 [mm] 317 373 373 444
B2 [mm] 326 380 382 453
C [mm] 258 277 348 383
12
11
10
9
8
7
13
4
6
C
12
B2 B1 5
A
3
Model EWS-6 EWS-10 EWS-15 EWS-25
Volume [L] 6 10 15 25
Voltage/ Frequency [v/Hz] 230~50
Power [W] 2000 2000 2000 2000
o
Max Stdg. Loss [kWh/24h/45 C diff.] 0.792 0.99 1.138 1.386
[as per IS 2082:1993 amended in 2002]
0
Actual Stdg. Loss [kWh/24h/45 C diff.] 0.444 0.561 0.622 0.770
0
Reheating Time for 50 C rise [in min] 16 33 48 72
Rated Pressure [bar] 8 8 8 8
4

Key Features
ANODEROD
PROTECTION
The tank has an anode rod system with a stainless steel core that is designed to
protect the tank from corrosive elements. The system uses a special cathodic action to
fight the corrosive elements, and thus prolong the life of the water heater.
Anode Rod protects the tank from corrosion
BLUE DIAMOND
GLASS LINING
The new Blue Diamond technology with enhanced levels of zircon increases the life of
the water heater. The lining is proven to be stronger and more water-resistant than
any other in the industry.
Scale and sediment build-up on the surface of standard elements leads to premature
failure. An A. O. Smith Glass Coated Element helps to prevent scale formation on the
element extending the life of the element.
GLASS COATED
ELEMENT
SAFETY VALVE
This water heater has a temperature and pressure safety valve. The valve is designed
to automatically relieve and discharge water in case the pressure or temperature
overshoots the preset limits.
Safety Valve discharges water in case pressure or temperature exceeds preset limits
THERMAL CUTOUT
In case a fault occurs and the water temperature exceeds the highest preset
temperature on the thermostat, the breaker rapidly cuts off the live line and the zero
line simultaneously to guarantee safety.
Thermal Cutout cuts off electrical power to the unit if a fault occurs, ensuring safety
Blue Diamond Glass Lining offers the best protection against tank corrosion
Glass Coated Element increases the life of the heating element
3
ANODE ROD
PROTECTION

Installation
4
Mounting
1. Make necessary plumbing with reference to the installation diagram on the right page.
2. Connect the safety valve in the water inlet [blue]. It must be installed at the side of the inlet pipe. It
has been factory set at 0.8 MPa and is not adjustable. The discharge tube of this valve must face
downward and the discharged water must be piped up to or within 15cm above a suitable drain.
Under any circumstances, the drain line cannot be blocked and must be open to atmosphere.
Attention: The direction of arrow points to the water heater that indicates the direction of the water
flow current.
3. Connect the hot water pipe to the outlet [red].
Attention: Make sure a suitable sealing tape is used for all connections to prevent leakage. Meanwhile,
the safety valve must not be screwed too tight to prevent damage.
Plumbing
1. Make sure that the wall can withstand at least twice the weight of water heater when completely filled
with water.
2. Before locating the position for installation, make sure that there is a clearance of no less than 300
mm between the front of the heater and the wall. This allows easy opening of the decorative front
panel for maintenance or to reset the thermal cutout when necessary.
3. Use a drill bit with diameter of 10mm to drill 4 holes at least 90mm deep in the wall. The four holes
should be aligned horizontally and vertically. The horizontal distance between the 2 holes should be
120mm and the vertical distance should be 57mm, as shown in the above diagram.
4. Insert the expansion anchors into the holes. Place the wall bracket over the expansion anchors and
tighten the screws on the bracket.
5. Hang the water heater using the hanger hooks on the wall, through the 4 holes on its mounting
bracket. Move the water heater downward to ensure that the holes are pressed against the root of the
hanger hooks and ensure the water heater is fixed steadily.
Wall

The power cord and plug are connected with this water heater. Find a separate socket for power plug and
make sure the socket is in contact with the plug.
Electrical Connections
1. Switch on the water heater’s power supply. The
green indicator light comes on.
2. Turn the thermostat knob clockwise for the device
to commence heating and change the set
temperature. A red light will come on. [The set
temperature increases if the thermostat knob is
turned clockwise.] Temperature can be set in the
0 0
range of 25 C to 75 C. Recommended to keep
thermostat knob notch position always in
Medium or above level.
3. The red light’s switching off indicates the heater
has been heated to the set temperature.
Operation Instructions
Filling Water
1. Open a hot water faucet nearby to permit the air
to escape.
2. Open the cold water inlet valve fully, filling the
heater and the piping.
3. Close the hot water faucet when water flows.
4. Check all the connections to see if there is any
leak. In case of a leak, drain the heater
completely, repair the leaking joint and then refill
the heater.
Hot Water outlet
Mixing Valve
Cold Water Inlet
Tube
Lever
Safety Valve
Mixing Water Floor Drain
5
MEDIUM
HIGHLOW

Check proper functioning of the safety valve every two months by opening and closing the test lever. The
heating element should be checked annually for scale formation, caused by impurities in the water supply.
Also, the anode should be checked annually and replaced when worn out over 60%. For cleaning the
element or replacing the anode, use the following procedure:
1. Switch off the electric supply to the water heater.
2. Open the hot water taps until the water is not hot any more.
3. Close cold water supply.
4. Drain the water heater by removing the safety valve in the direction
of the arrow as indicated in the diagram shown alongside and open the hot water taps.
5. Take off the water heater from the hanger hook when the water heater is empty.
6. Remove the decorative front panel, unscrew the heating assembly flange.
7. Clean the container and the heating element assembly from scale by using a suitable acid or by gently
scraping the scale.
8. Replace anode, if required.
9. Remount the heating assembly flange.
10. Hang the water heater on the hanger hook on the wall through the 2 holes of its mounting bracket.
Move the water heater downward to ensure that the holes are pressed against the root of the hanger
hooks, and ensure the water heater is fixed steadily.
11. Open cold water supply until water flows without interruption from hot water faucets.
12. Close the hot water taps and check for eventual leakage around the flange.
13. When there is no leakage, replace the decorative front panel. Then switch on electric supply.
6
Maintenance and Cleaning
Changing the Decorative Front Panel

Troubleshooting
Circuit Diagram
Green and
Red light off
No hot water
Green light on
Red light off
No hot water
Problem Cause(s) Action
No power to heater
Thermal cutout switch open
Control circuit or internal
wiring error
Non-functioning
thermostat
Control circuit or internal
wiring error
Thermostat set is too high
Thermal cutout trips
Non-functioning element
Non-functioning
thermostat
Improper calibration
Connection not sealed
Turn on electrical switch. Check for
blown fuses or tripped breaker
Call Customer Care Centre on 1.800.103.2468
Call Customer Care Centre on 1.800.103.2468
Call Customer Care Centre on 1.800.103.2468
Thermostat may need to be replaced
Call Customer Care Centre on 1.800.103.2468
Call Customer Care Centre on 1.800.103.2468
Element may need to be replaced
Call Customer Care Centre on 1.800.103.2468
Thermostat may need to be replaced
Call Customer Care Centre on 1.800.103.2468
Thermostat may need to be replaced
Call plumber
Water temperature is
too high
Water heats slowly
Thermostat does not
shut off
Piping connection leaks
Tank or parts leak Shut off power immediately, and
Call Customer Care Centre on 1.800.103.2468
Leaky cover
7
Element
Black
Thermostat
Green
White
High limit
Green light Red light