A.O. Smith CEWHR Series User manual

Intelligent Water Heater
(CEWHR)
CEWHR-40PE6/CEWHR-40
CEWHR-50PE6/CEWHR-50
CEWHR-80PE6/CEWHR-80
CEWHR-100PE6/CEWHR-100
User Guide

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 .....................................................................4
Dimensions
Key Features ......................................................................5
Blue Diamond Dual Elements
Blue Diamond Tank
Touch Control Panel
Hot Water Display
Instant Heating
MAX Function
Intelligent Dormancy
Programmable Timer
3 Year Full Warranty
Thermal Cut Out
High Efficiency Insulation
Pressure Relief Valve
Anode Protection
Installation .........................................................................7
Mounting
Mounting Procedures and Precautions
Mounting Guidelines
Plumbing Connection
Water Inlet and Outlet Connection
Power Connection
Water Filling
Control Panel Concealed Installation
Directions for use ...............................................................11
Maintenance Instructions ...................................................16
Maintenance
Troubleshooting .................................................................17
Wiring Diagram
3

Specifications
Type
CEWHR -Intelligent Water Heater
Rated volume (L)
40 50 80 100
Power (kW)
2.0/3.3 2.0/3.3 2.0/3.3 2.0/3.3
Voltage/Frequency (V/Hz)
230/50 230/50 230/50 230/50
Temperature range (
°C) 35-75±5 35-75±5 35-75±5 35-75±5
Rated water pressure
(MPa) 0.8 0.8 0.8 0.8
Minimum
inlet water pressure (MPa) 2.0 2.0 2.0 2.0
Maximum inlet water pressure (MPa)
3.0 3.0 3.0 3.0
Inlet/outlet connection (inches)
½½½½
Waterproof grade
IPX4 IPX4 IPX4 IPX4
A. O. Smith reserves the right to make product changes or improvements at any time without notice.
Dimensions
Model
CEWHR-40 CEWHR-50 CEWHR-80 CEWHR-100
L(
mm) 718 838 863 1028
L1(
mm) 275 340 365 446
S (mm)
217 217 250 250
D (mm)
Ø395 Ø395 Ø463 Ø463
4

Key Features
Blue Diamond Dual Elements (Patent ZL200510037670.1)
This water heater has two patented Blue Diamond heating elements which increase
heating efficiency by up to 50%.
Blue Diamond Tank (Patent US6303183)
Patented A. O. Smith Blue Diamond Tanks provide superior durability. The longest
lasting Blue Diamond tank in the world was used for 52 years.
Touch Control Panel
Access all modes of the water heater or reduce your water heating bills by turning
down your water heater’s thermostat from the control panel.
5
Hot Water Display
Temperature sensors in the heater provide a visual display of hot water from the
control panel.
Instant Heating (Patent ZL200820185859.4)
Upon activation of the patented instant heating function, users will have hot water to
take a shower within 2 minutes.
MAX Function (Patent ZL200820185859.4)
The patented MAX function allow users to get up to four times the capacity of hot
water from a regular water heater.
Intelligent Dormancy
During periods when water is not used, the heater goes into power-saving mode.

3 Year Full Warranty
With the highest manufacturing standards and strict quality control, we assure users
durability with a 3 year full warranty on the whole unit, the longest warranty in
Singapore.
3years
Programmable Timer
The timer turns on the water heater for you so you don’t have to turn it on manually. It
also switches your heater to energy saving mode when not in use.
6
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.
High Efficiency Insulation
A polyurethane foam insulating layer without freon is used, which provides a good
insulation and reduces heat loss effectively.
Pressure Relief Valve
The safety valve will relive pressure automatically through droplets of water when
the system exceeds the rated pressure.
Anode Protection
A strong steel core anode rod is used for protecting the inner tank. It greatly
prolongs the service life of the water heater.

Installation
CAUTION:
•Please wait for 30 minutes before using the heater for the first time.
•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 installed by a qualified personnel.
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.
Mounting Procedures and Precautions
The surface for installation 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 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.
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.
Model L (mm)
CEWHR-40 260
CEWHR-50 380
CEWHR-80 380
CEWHR-100 380
7

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 on 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.
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.
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 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.
CAUTION:
•Apply proper sealant to the pipe joints to prevent leakage. Do not over-tighten the safety valve
to avoid damage.
8
correct installation incorrect installation100mm depth

Water Inlet and Outlet Connection
Power Connection
Profile of heater right side up
9
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. The
insulation of the fixed wiring must be protected by an insulating sleeving with a temperature rating
of at least 80°C.
Ensure the water heater is reliably grounded. The earth wire must be longer than the current carrying
conductors. The maximum power of this water heater is 3300W, 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.
Thermal cutout
Live wire (L)
Neutral wire (N)
3000W heating element
Earth wire
2000W heating element

Control Panel Concealed Installation
For the convenience of operation, the control panel may be installed on a wall near the water heater.
Installing the remote panel in the wall:
•Dismantle the control box and remove the wire connected to the panel and the heater
•Thread the wire cable through the fixing panel and back cover
•Assemble the layers in the order as shown. Fix the control box to the wall by pressing firmly against
the front cover.
10
Front cover
Digital display
Back cover
Wall for
concealed
installation
Fixing panel
Wall opening
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.