A.O. Smith EWS 1 User manual

Size: 210mm (H) x 148mm (W)
Part No.: 323976-000_R3
Approved on: 10-05-2013
User Guide
* Conditions Apply
Water Heater
EWS 1 & 3 Litres
EWS 3 Litres
Fit it &
Forget it
Guaranteed* A. O. Smith
Service within 24 hours.
Call: 1.800.103.2468
EWS 1 Product Design: REGD/237701
EWS 3 Product Design: REGD/237702
EXPERT SERVICE
Why people prefer an A. O. Smith water heater...
Instant water heater with
Glass Coated Heating
Element.
INNOVATIVE
SUPERIOR QUALITY
Get the best quality that
ensures you have a water
heater that works in
Indian water conditions.
Heating technology that
will always give you hot
water… Guaranteed!
RELIABILITY

Congratulations!
And welcome to the A. O. Smith family.
We would like to thank you for the trust you have shown in choosing an A. O. Smith water
heater. You can be sure it will live up to your expectations. Thousands of delighted users all over
the world trust A. O. Smith water heaters for their families. This user guide will introduce you
to your water heater. Follow the instructions carefully and look forward to enjoying long years
of trouble-free service.
A. O. Smith is a company known for its innovative technologies and energy-efficient solutions.
®
Ours are the only water heaters with the Blue Diamond Glass lining for the inner container of
the storage water heater. This cutting edge technology prevents sediment and scaling, fights
corrosion and extends the life of your water heater.
Our customer-centric approach manifests itself in many other ways too. If you need any
information or assistance with your water heater, just call us from any phone, anywhere in the
country to our Toll Free Customer Care No. 1.800.103.2468.
Or
Factory Address:
A. O. Smith India Water Heating Private Limited
Plot No. 300, Phase-2, KIADB Industrial Area, Harohalli, Kanakapura Taluk,
Ramanagara District - 562 112, Karnataka, India.
About A. O. Smith
A. O. Smith India Water Heating Private Limited was established in 2006. Since then, the
A. O. Smith team has conducted numerous focus group studies and spent endless research
hours determining what India wanted in a water heater. Backed by 75 years of proven
technological advances, A. O. Smith India has created a stylish design with features demanded
by the Indian consumer.
The A. O. Smith plant with manufacturing facilities spread over 76,000 sq.ft. is located on
20 acres, just outside Bengaluru, in the KIADB Industrial Area, Harohalli. The India operations
th
is the 16 A. O. Smith manufacturing facility worldwide. A. O. Smith's India plant has extensive
engineering and technical resources and has the latest technologies incorporated. A. O. Smith
is the first manufacturer to invest in and produce glass lined water heaters in India.
Today, A. O. Smith Corporation is one of the largest water heater manufacturers in the world
and is a global leader in innovative technology and energy efficient solutions.

What's in the box?
Electric
Water Heater
User Guide Wall Mounting
Accessories
Contents
Specifications..............................................................................................1
Key features ................................................................................................2
Installation ..................................................................................................3
Operation instruction.................................................................................5
Troubleshooting..........................................................................................6
Circuit Diagram...........................................................................................6
Warranty .....................................................................................................7
Jurisdiction..................................................................................................8
Warranty Card.............................................................................................9
Service and Maintenance ...........................................................................10
User Guide
* Conditions Apply
Water Heater
EWS 1 & 3 Litres
EWS 3 Litres
Fit it &
F
orget it
Guaranteed* A. O. Smith
Service within 24 hours.
Call: 1.800.103.2468
EWS 1 Product Design: REGD/237701
EWS 3 Product Design: REGD/237702
EXPERT SERVICE
Why people prefer an A. O. Smith water heater...
Instant water heater with
Glass Coated Heating
Element.
INNOVATIVE
SUPERIOR QUALITY
Get the best quality that
ensures you have a water
heater that works in
Indian water conditions.
Heating technology that
will always give you hot
water… Guaranteed!
RELIABILITY

Caution: *Safety valve has been factory fit with the water heater and set at 0.8 MPa
(8 Bar) rated pressure.
Warning: Do not tamper or detach the safety valve from the water heater.
Specifications
Model EWS 3 EWS 1
Volume [litres] 3 1
No. of Element One One
Power [kW] 3/4.5 3/4.5
Voltage/Frequency [V/Hz] ~230/50 ~230/50
Temperature range [°C] 25-75 25-75
Working Pressure [Bar] 6.5 6.5
Inlet/Outlet connections [Inch] ½ ½
Tank Warranty [Year] 5 5
1
Dimensions
Model EWS 3 EWS 1
A [mm] 245 215
B1 [mm] 348 306
B2 [mm] 384 346
C [mm] 197 167
Part Descriptors
1 Outlet
2 Inlet
3 Safety Valve
4 Thermostat
5 Thermal - Cutout
6 Front Casing
7 Back Casing
8 Heating Element
9 Inner Container
10 Green Lamp Indicator
11 Red Lamp Indicator
12 Reset Button
EWS 3 Litre EWS 1 Litre
4
8
9
5
7
12
6
C
10
3
11
B1
21
A
B2
12
9
8
45
7
6
C
10
3
11
B1
21
A
B2

2
Key Features
The container has a high pressure withstanding capacity of 95 psi (6.5 bar
equivalent to 65 metres water head), which makes it suitable for high-rise
buildings.
Superior quality ABS outer body prevents rusting. The elegantly styled water
heater matches kitchen and bathroom décor.
This Instant Water Heater gives you a 3 year* warranty on the Glass Coated
Heating Element.
Scale and sediment build-up on the surface of the element can lead to
premature failure. A. O. Smith Glass Coating helps to prevent scale formation
and extends the life of the heating element.
It has a superior Thermostat. In case a fault occurs and the water temperature
exceeds the preset temperature, the Thermal Cutout cuts off the power supply
to assure safety.
The Inner Container is highly dependable, it comes with a 5 year replacement
warranty.
Glass Coated Heating Element
High-rated Pressure
6.5
BAR
Hi-tech Thermostat & Cutout
Rust-proof Outer Body
3 year Warranty on Heating Element
5 year replacement Warranty on Inner Container
*The heating element has a 2 year warranty that can be extended to 3 years if registered within the first two months of purchase.
3
YEAR
WARRANTY
5
YEAR
REPLACEMENT
WARRANTY

Installation
Mounting
1. Make sure that the wall can withstand at least twice the weight of water heater when
completely filled with water.
2. Use a drill bit with diameter of 6mm to drill 3 holes at least 35mm deep in the wall, as
shown in the above diagram.
3. Insert the expansion anchors into the holes, tighten the screws providing sufficient gap for
mounting the water heater.
4. Hang the water heater using the 3 screws on the wall and ensure the water heater is fixed
steadily.
EWS 3 Litre
54.5 mm
116 mm
EWS 1 Litre
65mm
173mm
Water heater must be mounted on the wall by fixing 3 nos. of screws (as provided)
Plumbing
1. Make necessary plumbing with reference to the above installation diagram.
2. It is recommended that suitable nylon/SS braided hoses should be used. These hoses
should have a minimum pressure rating of 6.5 Bar and should be compatible for hot water
applications.
3. Connect the cold water pipe to the inlet [blue].
4. Connect the hot water pipe to the outlet [red].
Attention: Make sure a suitable sealing tape is used for all water connections to prevent
leakage. Meanwhile, the hoses should not be tightened excessively over the inlet/outlet
tubes of the product. The hexagonal faces of the inlet outlet tubes must be held firmly by
means of a suitable wrench while fastening the hoses onto them. Failure to do so will
result in damages to the product and voids the guarantee.
3

Electrical Connections
4
Filling Water
EWS 3 Litre EWS 1 Litre
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.
 The Power cord is provided with this water heater. Customer should procure a suitable plug
with adequate ratings.
 For a 3kW unit , the power plug should be having a minimum 15 A rating.
 For a 4.5kW unit , the power plug should be having a minimum 20 A rating.
 The Power plug should be BIS certified in view of Product performance and Safety.
Warning:
Connect the water heater using independent sockets, adhering to national standards, to
ensure reliable earthing. Do not use adapters. Use pen multimeter to check whether the
live line and neutral line are not reverse, to ensure complete safety.
Note :
 The RED, BLACK and GREEN wires in the power cord corresponds to Live, Neutral & Earth
connections.
 These should be connected in the Plug accordingly. It is not permitted to leave out or
short the earth wire with Neutral.
 Reliable earthing in the circuit should be ensured by the customer before installation.
 Ensure that the Live, Neutral & Earth Terminals in the plug corresponds to the same in the
socket.
 Use a pen multimeter to check the socket for any reversed Live & neutral lines and take
corrective action by a qualified electrician if required.
Safety Valve
Cold water inlet
Hot water outlet
Safety Valve
Cold water inlet
Hot water outlet

1. Ensure the installation is done as per instructions (refer Mounting, Plumbing & Electrical
Connections section in pages 3 & 4).
2. Ensure the inner container is filled with water (refer Filling Water section in page 4).
3. Plug in the electrical power cord & switch on the electrical supply.
4. Once the water heater is switched on, both the red & green indicators will glow. Red light
indicates the heating & green light indicates the power supply to the water heater.
5. After the water reaches the preset temperature, the red light will switch off indicating that
the heating is completed & water heater is in standby mode. The water heater will be in
standby mode until the hot water is withdrawn from the outlet or the temperature of
the water drops due to passage of time.
6. Open the outlet faucet to get the hot water. Upon withdrawing sufficient amount of hot
water, the water heater will again enter into heating mode. This is indicated by glowing of
red & green lights.
7. After usage, switch off the electrical supply & close the outlet valve.
Caution: Hot water over 50°C will cause scalding. In order to protect you and your family
especially for the safety of children, ensure that the hot water flow & cold water mix is
adjusted in the faucet accordingly before usage. It is advised not to use the outlet from
this water heater directly in a shower or in a faucet. Suitable mixing with cold water is
required before usage.
Operation Instructions
Warning: This water heater should not be operated with insufficient amount of water.
Failure to do so may result in damage to the water heater & injuries to the users. This
will also make the warranty null & void.
Warning: The water heater should be connected to the mains using a power plug
conforming to national standards and suitable current carrying capacity (refer Electrical
Connections in page 4).
Do not switch on the heater, if the water in the inner container is in frozen condition.
5

Troubleshooting
Note: Call Customer Care Centre on 1.800.103.2468
Problem Possible Cause(s) Solution
• Green and Red No power to heater Turn on electrical switch. Check for
light off blown fuses or tripped breaker
• No hot water Thermal cutout switch open Press Reset button
Control circuit or internal Call Customer Care Centre
wiring error
• Green light on Non-functioning Call Customer Care Centre
Red light off thermostat
• No hot water Control circuit or internal
wiring error
• Water heats slowly Non-functioning element Call Customer Care Centre
• Thermostat does Non-functioning Call Customer Care Centre
not shut off thermostat
Improper calibration Call Customer Care Centre
• Piping connection Connection not sealed Call plumber
leaks
• Leaky cover Tank or parts leak Shut off power immediately and
Call Customer Care Centre
6
Circuit Diagram
G
N
L
1
5
2
4
3
1. Cut-out
2. Indicator Lamp Green
3. Thermostat
4. Indicator Lamp Red
5. Heating Element