A.O. Smith ELJH-30 User manual

Storage Water Heater
ELJH-30
ELJH-40
ELJH-50
ELJH-80
ELJH-100

1
About A.O. Smith
In 1936, A. O. Smith developed and patented a technology to glass-line water heaters. Over the years, A.
O. Smith has gained the respect and support of homeowners, contractors, architects and specifying
engineers in over 60 countries by providing innovative energy efficient products designed for years of
trouble-free service.
Today A. O. Smith Water Products Company, the largest water heater manufacturer in the world, is a
global leader in innovative technology and energy efficient solutions.
What’s in the box?

2
Contents
Specifications ....................................................................................3
Component Description .....................................................................4
Key Features .....................................................................................5
Glass Coated Element
Blue Diamond Glass Lining
Anode Protection
Safety Valve
Thermal Cut Out
Installation ..........................................................................................6
Mounting
Mounting procedures and precautions
Mounting guidelines
Plumbing connection
Water inlet and outlet connection
Power connection
Wiring diagram of water heater
Water filling
Directions of use ..............................................................................10
Temperature setting operation
Maintenance Instructions .................................................................10
Maintenance
Troubleshooting ..............................................................................12

3
Specifications
Type
ELJH-Horizontal Wall Mounted
Rated volume (L)
30
40
50
60
80
Power (W)
2000
2000
2000
2000
2000
Voltage/frequency (V/Hz)
220/50
220/50
220/50
220/50
220/50
Temperature range (°C)
35-75±5
35-75±5
35-75±5
35-75±5
35-75±5
Rated water pressure (MPa)
0.8
0.8
0.8
0.8
0.8
Minimum inlet water pressure
(MPa)
2.0
2.0
2.0
2.0
2.0
Maximum inlet water pressure
(MPa)
3.0
3.0
3.0
3.0
3.0
Inlet/outlet connection (inches)
½
½
½
½
½
Waterproof grade
IPX1
IPX1
IPX1
IPX1
IPX1
Weight (kg)
17
19
21
24
31
Overall dimensions (mm)
Ø360x605
Ø360x710
Ø360x830
Ø360x962
Ø463x860
A. O. Smith reserves the right to make product changes or improvements at any time without notice.

4
Component Description
Part Description
1. Temperature indicator
7. Multi-function safety valve
2. Heating element
8. Stopcock (not included with water heater)
3. Anode
9. Pilot light
4. Cold water inlet pipe with diffuser
10. Inlet
5. Hot water outlet pipe
11. Outlet
6. Thermostat
12. Thermal cut out

5
Key Features
Glass Coated Element
Scale and sediment build up on the surface of standard elements lead to premature
failure. An A. O. Smith glass coated element helps to prevent scale formation on the
element, extending the life of the element.
Blue Diamond Glass Lining
A. O. Smith water heaters come with special glass lined inner containers. This lining is
achieved through a specialized fusion process carried out at 870ºC. Inner tanks are
designed to pass the 100,000 cycle fatigue life test in accordance with relevant UL
(Underwriters’ Laboratories) Standards. This makes our tanks one of the best inner
containers, resistant to rust and scaling.
Anode Rod Protection
The tank has an anode rod system with a stainless core that is designed to protect the
tank from corrosive elements. The system uses a special cathodic action to fight the
corrosive elements, prolonging the life of the water heater.
Safety Valve
This water heater has a pressure safety valve. This valve is designed to automatically
relieve and discharge water in case the pressure or temperature exceeds the preset
limits.
Thermal Cut Out
The water heater employs a thermal cut out. In case any fault occurs and the water
temperature exceeds the highest preset temperature (93°C), the switch rapidly cuts off the
live and neutral line for user’s safety.

6
Installation
Mounting:
Mounting
This water heater should be installed at a location that is close to a power source, floor drain and water
utilization point. In the installation area, it should be ensured that the water leakage from the heater or
pipeline joints may not cause damage to the articles in adjacent regions or lower layers of the building.
When installing the water heater, be sure to mount the water inlet and outlet pipes at the bottom of the
heater.
Vertical installation of the water heater is strictly prohibited.
Mounting procedures and precautions
The installation surface must be capable of supporting at least three times the weight of the water heater
when filled with water. If the water heater is not installed on the weight bearing wall or is mounted on
hollow brick wall, corresponding protective measures must be provided.
This water heater must be installed with the fixing accessories provided. The heater must be hung until the
accessories are fixed firmly or else the heater may fall off, and serious injuries might be caused.
CAUTION:
•The heater should only be connected to a power source after a full installation which ensures secure
mounting, piping, wiring and filling of the tank with water.
•To prevent injuries from lifting heavy equipment, the water heater should be installed by at least 2
persons.
•The water heater must be lifted in an upright position. Do not tilt over a 45º angle. Disassembly and
assembly by end users are prohibited.
•The water heater must be installed by a qualified personnel
CAUTION: Please wait for 30 minutes before using the heater for the first time.

7
Mounting guidelines
Drill two holes at least 90 mm in depth using an electric impact drill with a Ø 10mm bit. The holes must be
level. Space between the two holes should be as shown in the table.
A
plastic expansion tube must be placed into the drilled
holes before the brackets are inserted.
It is necessary to use a special inner hexagon spanner to fasten the bolts into the expansion tubes, no other
tools are permitted. Ensure the screw is not excessively tightened. This may damage the expansion tubes.
Insert the square holes of the upper of supporting rack at the back of the water heater onto the brackets,
then press the water heater down firmly to ensure the holes are lodged against the brackets.
Model
L (mm)
ELJH-30
260
ELJH-40
260
ELJH-50
380
ELJH-60
380
ELJH-80
380
ELJH-100
380
CAUTION:
•The mounting accessories provided can only be used for solid walls, as shown in the drawing above.
Improper installation may cause the water heater to dislodge.
100mm depth
correct installation
incorrect installation

8
Plumbing connection
Do not alter the installation position or block the relief valve. Connect the safety valve provided with this
unit to the inlet of the water heater (inlet pipe has a blue cap). The arrow points to the direction of water
flow (to the heater). The storage heater must be permanently connected to the water mains and the use of a
hose set is prohibited. The safety valve must be connected to the discharge pipe, mounted downwards to a
floor drain in a frostless environment. As water may drip from the discharge pipe during operation of the
heater, a floor drain should be provided nearby. The pipes should not be blocked. The relief valve is to be
operated regularly to remove lime deposits and to verify that it is not blocked.
The hot water pipe is connected to the water outlet (outlet pipe has a red cap). If the water pressure of the
inlet pipe approaches or exceeds the relief limit (0.80 MPa) of the safety valve, the valve will relieve
pressure automatically. Refer to the following diagram for the pipe connection. Nylon hoses should be used
for the connection between the tapping pipe and the heater.
We recommend the use of a double check valve assembly for the installation of the water heaters. The
double check valve assembly is a safe and effective measure for preventing backflow and back-siphonage
of water from the water heaters through the inlet pipe.
Water inlet and outlet connection
CAUTION:
•Apply proper sealant to the pipe joints to prevent leakage. Do not over-tighten the safety valve to
avoid damage.

9
Power connection
This water heater must be permanently connected to the electrical supply through a double pole switch
having a contact separation of at least 3mm in all poles incorporated in the fixed wiring. Use an
independent high-quality socket that is reliably grounded. Its rated current should not be less than 16A.
Ensure reliable contact with the power source.
The maximum power of this water heater is 2000W, hence a single dedicated power supply circuit is
proposed. The core area of the electric supply wire should not be less than 2.5 mm². If the supply cord is
damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order
to avoid a hazard.
Wiring diagram
1. Thermostat setting knob
4. Power supply connection
2. Pilot light
5. Ground connection
3. Thermal cut out reset button
6. Heating element
Water filling
After all the pipes are connected, open the discharge valve of the water heater and then the feed valve.
Fill the water heater with water and exhaust the air till a uniform water stream flows out of the hot water
outlet. This indicates that the water heater has been filled up. Close the hot water discharge valve and
check all connections for any leakage. If leakage occurs, empty the water tank, repair the leaked
connection and then refill the heater with water. Do not close the feeding valve during the filling of water.
Live wire
Neutral wire
Earth wire

10
Directions for use
Before using the water heater, make sure it is filled with water and that the power source has been
connected properly. Please wait for 30 minutes before using the heater for the first time.
Temperature setting
Set the temperature by adjusting the temperature setting knob on the right side of the water heater. The set
temperature goes up when turning down the knob and goes down when turning upwards. The default
temperature setting is the highest temperature.
Operation
After making sure the heater is filled up, turn the power on. The indication light will be lit as the water is
heating. The indication light will go off when the water has been heated to the set temperature.
Note: Water dripping from the safety valve outlet during heating is a normal occurrence. Under normal
conditions, the safety valve lever should be opened periodically. If water flows from the valve, it is in good
working condition. Otherwise, please contact a local authorized A. O. Smith dealer.
Maintenance instructions
DECLARATION: Only an A. O. Smith authorized service personnel may maintain and repair this water
heater. Improper methods could result in serious injury or property damage.
WARNING - Electric shock: Before repairing the water heater, be sure to disconnect the water heater from
the power source.
CAUTION: Prior to repair works, please refer to the troubleshooting chart.
Maintenance
If the water heater needs to be serviced, close the water inlet valve, then open the drain valve. Rotate the
handle of the relief valve, release the nut connected to the water outlet joint of the inner tank and drain the
water from the discharge pipe.
It is recommended that the tank be flushed to remove sediments which may have built up during operation.
Specific operating procedures are as follows:
1. Disconnect the power.

11
2. Screw off the relief valve and remove the internal water inlet pipe of the water heater.
3. Connect the water outlet pipe connection of the water heater to the tap water pipeline and fill water
from this end. The water inlet pipe connection is connected to floor drain by pipes. Discharge water
from this end.
4. Open the water inlet valve to get the maximum tap water flow and flush the tank till the drained water
from the tank becomes clean.
5. Connect the water inlet and outlet pipes again and put the water heater to use after a leakage test.
CAUTION:
•The drained water might be very hot and may scald.

12
Troubleshooting
Problem
Possible causes
Corrective action
No indication light
No hot water
1) No power to heater
2) No power at electric socket
3) Failure in control circuit or
internal wiring
1) Switch on power to heater
2) Check power socket
3) Contact local authorized
dealer
No indication light
High water temperature
1) High temperature limit switch
tripped
2) Electrical circuit failure
1) Switch off power supply
2) Contact local authorized
dealer
Indicator light on, no hot water
Heating element or internal circuit
failure
Contact local authorized dealer
Dripping from pipe joints
Unsealed joints
Reconnect pipes of the water heater
and be sure to use sealant
Dripping from enclosure
1) Tank or accessories leakage
2) Drain blocked
3) Condensation pipe distorted
or not downward facing
1) Disconnect power to heater
immediately
2) Check and direct condensation
pipe downwards
3) Contact local authorized
dealer
CAUTION:
•Before installing the heater, ensure that the power source and wires are suitable
•The heater should be earthed reliably. Ensure the earth wire is not in contact with the neutral wire or
any pipes
•Once the temperature has been set and the relief valve installed, end users should not alter the
installation location or tamper with the relief valve
•Hot water over 50°C will scald. Always test the water temperature by mixing it with cold water
before coming into contact with it.
•This appliance is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilities or lack of experience and knowledge, unless they have been given supervision
or instructions concerning use of the appliance by a person responsible for their safety.
•Children should be supervised to ensure that they do not play with appliance.