A.O. Smith CEWHR 35 User manual

User Guide
Water Heater
CEWHR 35, 50, 70 and 100 Litres
Quick heating.
Wired remote control.
EXPERT COMPANY SERVICE
www.aosmithindia.com
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 centrebefore 4 pm only. For more details please call
our TollFree No. 1800-103-2468 or log on to www.aosmithindia.com.
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POWER
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#
DAY RESOLUTION
TIME FIX
HOUR RESPONSE
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DAY RESOLUTION
TIME FIX

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 tank. 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. 1800-103-2468.
Or
Factory Address:
A. O. Smith India Water Products Private Limited
(formerly known as A. O. Smith India Water Heating Private Limited)
Plot 300, Phase - II, KIADB Industrial Area, Harohalli, Kanakapura Taluk,
Ramanagara District, Karnataka – 562 112, India.
CIN: U31909KA2006PTC040282
A. O. Smith India Water Products 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 started 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 is the 16th A. O. Smith manufacturing facility worldwide. In 2013, additional
150,000 sq. ft. was added in Bengaluru factory. 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.
About A. O. Smith

Read Before Operation.......................................................... 1
General.................................................................................. 2
Specifications........................................................................ 3
Key Features .......................................................................... 5
Safety Precautions................................................................. 6
Installation ........................................................................... 6
Connecting Safety Valve ....................................................... 9
Connecting to Water Supply................................................. 10
Operation .............................................................................. 12
Troubleshooting.................................................................... 18
Circuit Diagram .................................................................... 19
Warranty................................................................................ 20
Jurisdiction............................................................................ 21
Expert Company Service ....................................................... 21
Service and Maintenance ..................................................... 23
Contents
What's in the box?
Electric Water Heater with
wired Remote control Wall Mounting Accessories
Safety Valve Discharge
Tube
User Guide
Remote
Accessories

1
Read Before Operation
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 factory.
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 packaging if any 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 CEWHR water heater.
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. Always install, operate, inspect and maintain this product in accordance with
all applicable standards. Please store this user manual carefully for any future reference.

2
General
Indicates a potentially hazardous situation, which if not avoided, could
result in death or serious injury.
ndicates a potentially hazardous situation which, if not avoided, may result
in minor or moderate injury or property damage.
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”.
DANGER
WARNING
CAUTION
Important
These instructions have been written as a guide for the proper installation and operation of
your water heater. 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 heater must be installed by a Qualified Service
Technician.
Before proceeding with the installation instructions:
1. Inspect the water heater and its component parts for possible damage. Do Not
install or attempt to repair any damaged component parts. If you detect any
damage in the water heater, please contact the Dealer where the water heater
was purchased or call A. O. Smith Customer care.
2. Verify that the voltage being supplied corresponds to that which is marked on the
water heater manual.
DO NOT use this water heater if any part has been under water. Immediately contact a
Qualified Service Technician to inspect the water heater and contact A. O. Smith Service
personnel to replace any part of the control system which has been under water. Failure to
follow this instruction can result in property damage, serious injury or death.
WARNING
Safety
Your safety and the safety of your loved ones is paramount. There are several safety related
messages in this manual, which have been provided during various steps such as the
installation, operation and maintenance of your CEWHR water heater. 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 user manual.

3
Specifications
Note: Image may vary from the actual product.
Dimensions
Model CEWHR CEWHR CEWHR CEWHR
35 50 70 100
A [mm] 760 880 905 1070
øB [mm] 395 395 463 463
C [mm] 100 100 100 100
Figure 1
AB
C
Ø
Model (Horizontal Wall Mounted) CEWHR 35 CEWHR 50 CEWHR 70 CEWHR 100
Volume [L] 35 50 70 100
Power [kW] 1/1.5/2.5
Voltage/Frequency [V/Hz] ~220-230/50
Actual Stdg. Loss [kWh/24h/45°C diff.] 0.684 NA 0.920 NA
Reheating Time for 35°C rise [in min.] 49 67 88 110
Temperature range [°C] 35-75 ± 5
Rated water N/cm2 80
pressure Water head (metres) 80
Inlet/Outlet connections [inch] ½ BSP
Net Weight (kgs) 22 24 31 34

4
Figure 2
1 Cold water inlet pipe with diffuser
2 Hot water outlet pipe
3 Safety Valve
4 Wired Remote control
5 Blue Cap
6 Red Cap
7 Anode
8 Heating Element
9 Thermal Cut-out
10 Installation Bracket
Item Description
1
3
7
9
8
10 2
5
4
6
Without Service Cover With Service Cover

5
Key Features
Note: A. O. Smith reserves the right to amend or modify the specifications and features at any
time, as and when required without any prior notification.
Blue Diamond®Glass Lining
Blue Diamond®technology increases the life of the inner tank. The lining is
stronger and more corrosion resistant than any other in the industry.
Safety Valve
The safety valve is designed to automatically relieve and discharge water, in case
the pressure overshoots the preset limits.
Dual Glass Coated Heating Elements
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 elements. Dual element helps in quick
water heating.
Anode Rod
The tank has an anode rod which has stainless steel core that is designed to
protect the tank from corrosive elements. The anode rod uses a special cathodic
action to fight these elements and thus prolong the life of the water heater.
Remote Controls
The LED displays set temperature, actual temperature, timer, clock, etc. The user
can select the set temperature within the range of 35°C to 75°C. It is easy to
operate the water heater with wired remote control even if the water heater is
placed in an enclosed area.

Do not install the water heater where there is
direct sunlight or rain. It is has to be installed
indoor only.
During Installation
6
Figure 3
Do not install the water heater where water
splashes on the water heater.
Figure 4
Safety Precautions
Installation
Before installing, ensure that the following tools are available:
Figure 5
Tools Required
Hammer
Bubble Level Indicator Measuring Tape Impact
Drill Tool
Adjustable
Wrench Teflon Tape Ruler
CAUTION
CAUTION

7
Figure 6
Mounting the Water Heater
 Before locating the position for
installation of the water heater, make sure
that there is sufficient clearance between
the ceiling and the side wall.
 Select a place to mount water heater
horizontally with water connection at the
bottom.
 Water heater must be located within 3-1/2ft. (approx.) from a grounded 220V-230V
electrical outlet.
 Make sure that the wall can withstand at least twice the weight of the water heater
when completely filled with water.
 /RFDWHZDWHUKHDWHULQDQDUHDZKHUH
leakage of the tank or connections will
not result in damage to the area
adjacent or to lower floors of the
structure.
 7KH6DIHW\YDOYHFDQGULSGXULQJWKH
heating cycle of the water heater to
relieve excess water due to heat
expansion. So, the drain should always
be exposed to the atmosphere and
should not be blocked. Make sure the
Discharge tube is continuously facing
downward and is in a frost free
ambience.
Figure 7
Figure 8
Water
Heater
Ceiling Wall
3-1/2 ft
Solid
Concrete
Wall False
Wall

8
 8VHDGULOOELWZLWKGLDPHWHURIPPWR
drill 2 holes at least 90mm deep in the
wall (Step 3). The two holes should be
aligned horizontally.
 7KHKRUL]RQWDOGLVWDQFH'EHWZHHQ
holes is given in the below table (Step 2).
 ,QVHUWWKH([SDQVLRQDQFKRULQWRWKHKROH
(Step 1).
 3ODFHWKH+DQJHUKRRNRYHUWKH
Expansion anchor and insert the screw
over the Expansion anchor and tighten
the screw by rotating it till it gets fixed
steadily (Step 2).
 3ODFHWKHZDWHUKHDWHURQWKH+DQJHU
hook through Installation bracket. Tug
downwards on the water heater to
ensure that the water heater is fixed
steadily.
Figure 9
Figure 11
Figure 10
Model D (mm)
CEWHR-35 260
CEWHR-50 380
CEWHR-70 380
CEWHR-100 380
D
1
2
3
Hole
Concrete
Wall
90 mm
D
Drilling
Tool
Hole
Concrete
Wall
Expansion
anchor
Expansion
anchor
Hanger hook
Hanger
hook
Screw
1
2
Water
Heater
Concrete
Wall
1
Water
Heater
Wall
2
1
23
Wall
Water
Heater
3
Hanger hook
Installation
Bracket
Water
Heater
Water
Heater

9
Figure 14
Connecting Safety Valve
Figure 12
Wrap the threaded part of the cold water
inlet pipe with Teflon tape.
Connect the one end of the Discharge tube to the Safety vavle and connect the other
end of the Discharge tube to drain.
Figure 13
Connect the Safety valve to cold water inlet
pipe with Teflon tape wrapped on the inlet
pipe and rotate it in clockwise direction till
it get fixed.
Blue Cap
Cold water
inlet pipe
Teflon
Safety
Valve
To Drain
Blue Cap
Safety Valve
Discharge Tube
DANGER
Hot Water is dangerous, especially for children, aged or the disabled. The
Water Heater allows you to control the temperature of your hot water. Water
Temperatures over 52°C can cause severe burns instantly or death from scalds.
Do not leave a child or an infirm person in the bath unsupervised.
HOT
Scalding

10
Make sure a suitable Teflon tape is used for all plumbing connections to prevent
leakage.
  'LVFKDUJHWXEHVKRXOGEHLQVWDOOHGGRZQZDUGVZLWKRXWDQ\ORRSVIROGVRUNQRWV
Ensure that the free end of the Discharge tube is placed over a suitable drain and
away from the users.
  'LVFKDUJHWXEHLVSURYLGHGWRUHOHDVHWKHGLVFKDUJHIURPWKHZDWHUKHDWHUWKURXJK
the Safety valve) in case excessive pressure is developed. The contents of the
discharge from the Safety valve may be hot and may cause burns to the users and
damage nearby objects if not properly routed to a drain.
  ,WLVUHFRPPHQGHGWRRSHUDWHWKH'LVFKDUJHOHYHULQWKH6DIHW\YDOYHRQDUHJXODU
basis to ensure that there are no blockages and also to remove any lime deposits
that would have been formed inside the water heater.
  (QVXUHWKDWWKHZDWHUKHDWHULVLQSRZHU2))FRQGLWLRQZKHQWKH'LVFKDUJHOHYHULV
being operated. Ensure that the water is filled completely in the water heater before
switching it ON.
  8VHRQO\1\ORQ6WDLQOHVV6WHHO66EUDLGHGKRVHV)OH[LEOH+RVHVKDYLQJDPLQLPXP
pressure rating of 8 Bar and hoses should be compatible for hot water applications.
  )DLOXUHWRIROORZWKLVLQVWUXFWLRQFDQUHVXOWLQSURSHUW\GDPDJH
CAUTION
*Flexible Hoses to be procured by the customer, not part of standard product.
 0DNHQHFHVVDU\SOXPELQJZLWKUHIHUHQFH
to the Installation Diagram (Fig. 15).
 $26PLWKUHFRPPHQGV1\ORQ6WDLQOHVV
Steel (SS) braided hoses (Flexible Hoses)
having a minimum pressure rating of 8
Bar and hoses should be compatible for
hot water applications.
 &RQQHFWWKHFROGZDWHUSLSHWRWKHLQOHW
[Blue Cap].
 &RQQHFWWKHKRWZDWHUSLSHWRWKHRXWOHW
[Red Cap].
 $WWDFKWKH'LVFKDUJHWXEHWR6DIHW\YDOYH
as shown in Installation Diagram (Fig.15).
Connecting to Water Supply
Figure 15 Installation Diagram
Hot Water Tap
Cold
Water
Tap
*Flexible Hose To Drain
Red Cap
Blue Cap
Safety Valve
Lever
Discharge Tube

11
Installation of wired Remote control
For convenience of operation, please install the wired Remote control bracket on the wall near
the water heater. The length of the wire for the wired remote control is approximately 8 feet.
1. Mark the holes on the wall. The 2 holes should be aligned vertically. The vertical
distance between the 2 holes should be 24mm (Fig. 17).
2. Drill 2 holes of 30mm depth on the wall by using an electric Impact Drill tool (Fig. 8)
of diameter 6mm bit.
3. Fix the bracket on the wall by Expansion anchor and screw as shown in (Fig. 16).
Installation of Bracket for wired Remote
control Bracket for wired Remote control
Figure 16 Figure 17
Wall Screw
Bracket
Expansion anchor
24mm
 'RQRWLQVWDOOWKHZLUHG5HPRWHFRQWUROZKHUHZDWHUVSODVKHVRQWKH5HPRWHFRQWURO
 ,WLVUHFRPPHQGHGWKDWWKHZLUHG5HPRWHFRQWUROVKRXOGEHLQVWDOOHGRQWKH5HPRWH
Bracket.
 'RQRWXVHZHWKDQGVZKLOHRSHUDWLQJWKH5HPRWH
 0DNHVXUHWRLQVWDOOWKHZLUHG5HPRWHFRQWUROFORVHWRWKHZDWHUKHDWHU
WARNING

12
Connecting to Electrical supply
Figure 19
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
firm contact with the plug. Ensure that
reliable earthing has been done.
CAUTION
 Connect the water heater using independent sockets, do not use any adapters. Use
multimeter to check whether the live line and neutral line are not reverse, to ensure
complete safety.
 Before installing the water heater, confirm that the power of water heater matches electric
meter capacity and supply wire.
 The water heater should be earthed reliably. It is prohibited to connect the earth wire to
neutral wire or faucet water pipe.
Filling the Tank
Operation
1. Open a nearby hot water faucet to permit
air to escape.
2. Open the cold water inlet valve fully,
filling the water heater and the piping.
3. Close hot water faucet when water flows.
4. Check all the connections to see if there is
any leakage. In case of a leakage, drain
the water completely, repair the leaking
joint and then refill the water heater.
CAUTION
 This water heater should not be operated with insufficient amount of water. Failure to
do so may result in damage to the water heater and injuries to the user. This will also
make the warranty null and void.
 Once the Mounting, Safety valve, Plumbing and Water filling is completed, then only the
power supply should be switched ON.
Figure 18

13
Figure 20
Wired Remote Control
The wired Remote control for the water heater allow the customer to control the functions of
the water heater and to diagnose certain fault conditions
Power ON/OFF
To turn the wired Remote control on or off,
press the Power button. While heating, the
display shows actual temperature of water
inside the tank and the LED display glows as
shown in (Fig. 22).
Figure 22
Backlight LED indicators
Power button
Clock Set
Used to switch ON/OFF the
water heater.
Used to set the Real Time clock.
LED display
Indicates the water temperature,
clock, timer and Error messages
flash in the event of a failure.
Indicates the different modes of the
water heater.
Override Heating
Used to switch ON the water heater
instantly in the timer mode.
Power Selecting
Used to select the Power option
i.e., 1000W, 2000W or 3000W.
Timers
Used to set the ON/OFF time for the
water heater to switch ON/OFF
automatically.
Thermostat
Increases or decreases the set temperature or time
(when the timers or Clock Set is pressed.
Initial Power
When the water heater power supply plug is
connected, it is in initial power on state, i.e.
the water heater is ready for heating the
water. The wired Remote control will perform
the diagnosis function and all LED indicators
will glow and then switch off as shown in
(Fig. 21).
Figure 21

Clock Set Temperature Setting
The clock is Real Time Clock. Press “Clock
Set” button for 3 seconds, the hour time
(first two digits) starts blinking. Adjust the
hour time by pressing Sor Tbutton and
press “Clock Set” button to set the hour time
and press “Clock Set” button again, the
minutes time (last two digits) starts blinking.
Adjust the minute time by pressing Sor T
button and press “Clock Set” button to set
the minute time. Now the clock time is set as
shown in (Fig. 23).
Press the Sor Tbutton until the required
temperature is displayed on the LED
display. Wait for few seconds without
pressing any buttons, the value flashing in
the LED display will be changed as set
temperature and stored in memory. It will
return to its normal mode and the heating
of the water is based on the new set
temperature. While setting, the LED display
glows as shown in (Fig. 24).
Figure 23 Figure 24
You can know the time by pressing the “Clock Set” button in power on mode. The time will
display for ten seconds, then return to temperature display mode as shown in (Fig. 22).
NOTICE
 The clock time to be set before setting the Timing mode.
 Default set temperature (factory setting) is 70°C.
NOTICE
14
or
or
3 sec
or
or

Modes
There are two types of modes depending on the actual water temperature inside the inner
tank of the water heater:
When the temperature of the water drops by 5°C from the set temperature due to usage of
water, the water heater again enters into the Heating mode.
15
Figure 25
Heating mode Standby mode
When the actual temperature of the water
is less than the set temperature, it enters
into Heating mode. The Heating LED
indicator glows as shown in (Fig. 25).
After the water heater reaches set temperature,
it will enter into the Standby mode due to
thermostat cut-off and Heating LED indicator
switch off as shown in (Fig. 26).
Figure 26

16
Timing Modes
There are two types of Timing modes used to set the ON/OFF time for the water heater to
switch ON/OFF automatically.
Time ON mode
 This mode is used to set the ON time for
the water heater to switch ON
automatically
 Press and hold “Timers” button for
3 seconds (Step 1) to enter “Time ON”
mode, the hour time (first two digits)
starts blinking. Adjust the hour time by
pressing Sor Tbutton (Step 2) and
press “Timers” button again, the minute
time (last two digits) starts blinking.
Adjust the minute time by pressing
Sor Tbutton and press “Timers”
button to set the minute time and the
LED display glows as shown in (Fig. 27).
Time OFF mode
 This mode is used to set the OFF time
for the water heater to switch OFF
automatically
 Press “Timers” button again to exit the
“Timing ON” mode and “Time OFF“
flashes indicating you are now in the
“Time OFF“ mode and the “Timing OFF”
values will flash.
 Press and hold “Timers” button for 3
seconds (Step 1) to enter “Time OFF”
mode, the hour time (first two digits)
starts blinking. Adjust the hour time by
pressing Sor Tbutton (Step 2) and
press “Timers” button again, the minute
time (last two digits) starts blinking.
Adjust the minute time by pressing
Sor Tbutton and press “Timers”
button to set the minute time and the
LED display glows as shown in (Fig. 28).
Figure 27
Figure 28
1
2
or
or
or
Press and
hold for
3sec
2
or
or
1
or
Press and
hold for
3sec

Draining the Tank
Figure 31
Whenever the water heater is not used for an
extended period, unplug the unit and drain. If
it is below freezing temperature, you will
need to unplug the unit and drain it.
Please turn off the power supply to the water heater prior to draining the water heater.
CAUTION
Power Selecting
The water in the tank heats quick by changing
the power options. The default power
selection is 2000W. It can be changed to
1000, 1500 or 2500 W by pressing the “Power
Selecting” button. The LED display glows as
shown in (Fig. 29).
Override Heating
By pressing the ”Override Heating” button,
the water heater enters the heating state
instantly after the “Time OFF” time. The
heating continues until the set temperature
is reached. You can exit the heating mode
by pressing the “Override Heating” button
again during the instant heating mode. The
LED display glows as shown in (Fig. 30).
Figure 29
Figure 30
17
Discharge Tube
Discharge Lever
Safety Valve Port
 Switch off the electric supply to the water
heater.
 Open the hot water tap until the water runs
cool.
 Close cold water supply.
 Drain the water by lifting the Discharge lever
of Safety valve upwards (Refer “Figure 31”).