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MODELS
EQ 280 G
EQ 380 G
INSTALLATION- AND USER
INSTRUCTION
UNITED KINGDOM / IRELAND
WATERSTORAGEHEATERS
Read these installation instructions first before installing the appliance. Carefully read
the user instructions before igniting the appliance. Failure to follow these instructions
may lead to risk of explosion and/or fire and could cause material damage and/or bodily
harm.
Installation and commissioning should be carried out by a qualified competent installer.
The type of gas and the value at which the appliance is set standard in the factory are
registered on the rating plate. The appliance may only be installed in a room if this room
meets the ventilation requirements.
A.O.SMITHACCEPTSNORESPONSIBILITYFORWARRANTY,SERVICEAND/OR
PRODUCTLIABILITYINCASEOFUNAUTHORIZEDALTERATIONS,PRODUCT
MODIFICATIONSORREPAIR.
2
CONTENTS
PAGE
1.
General. ......................................................................................................... 4
1.1 - Description of the appliance .......................................................................... 4
1.2 - Technical safety equipment ........................................................................... 6
1.3 - Technical description ..................................................................................... 8
1.3.1 - Dimensions .................................................................................................... 8
1.3.2 - Technical data ............................................................................................. 10
2.
For the installer. ......................................................................................... 12
2.1 - Installation instructions ................................................................................ 12
2.1.1 - Installation .................................................................................................... 12
2.1.2 - Water connection ........................................................................................ 12
2.1.3 - Gas connection ........................................................................................... 13
2.1.4 - Flue system ................................................................................................. 14
2.1.5 - Flue down draught safety device................................................................ 14
2.2 - Commissioning ............................................................................................. 15
2.3 - Pilotadjustment ............................................................................................ 16
2.4 - Putting out of operation ................................................................................ 16
2.5 - Temperature regulation ................................................................................ 16
2.6 - Setting the nominal heat input ...................................................................... 17
2.7 - Conversion procedure ................................................................................. 17
2.8 - Maintenance ................................................................................................ 19
2.8.1 - Sacrificial anode .......................................................................................... 19
2.8.2 - Cleaning ....................................................................................................... 19
2.8.3 - Decalcification ............................................................................................. 20
2.8.4 - Spare parts.................................................................................................. 20
2.9 - Inletcombination .......................................................................................... 20
2.10 - Fault finding ................................................................................................. 20
2.11 - Gas smell ..................................................................................................... 21
2.12 - Condensation............................................................................................... 21
2.13 - Important warning........................................................................................ 21
3.
For the user. ............................................................................................... 22
3.1 - Commissioning ............................................................................................. 22
3.2 - Use .............................................................................................................. 22
3.3 - Putting out of operation ................................................................................ 22
3.4 - Fault finding ................................................................................................. 23
4.
Guarantee. .................................................................................................. 24
3
1. GENERAL
exceeding 25 mm. maximum dead leg
3.0 metres.
1.1 Description of the appliance
Construction of the water heater is
in accordance with the European
standard for gas heated water storage
heaters for sanitary application (EN 89).
The appliance thus meets the European
Directory for Gas Appliances and is
therefore entitled to carry the CE-
marking. It is an open flued appliance
without ventilator and with a flue gas
down draught safeguard (category
B11BS). The water heater is suitable
for a maximum working pressure of 8
bar. The water-heater tank is
manufactured from low carbon sheet
steel and is glass-lined on the inside. In
addition the tank is fitted with a
sacrificial anode as an extra protection
against corrosion. A thick PU-insulation
layer covered in a steel jacket reduces
unnecessary heat loss. When the
appliance is filled with water it
continuously is under water pressure.
As hot water is drained from the tank,
cold water is added immediately. Four
flue baffles has been placed in the flue
tube to improve heat transfer. The flue
gasses pass their heat on to the water
by means of radiation and convection.
The flue gasses are guided to the
chimney via the draught diverter. The
exhaust of the flue gasses is realized
by natural thermal draught (see drawing
1).
Dead legs on a hot water installation
are undesireable. Where possible they
should be avoided. Where the inclusion
on the system of a dead leg is
unavoidable the following restrictions
should be applied:
-
for pipes not exceeding 19 mm.
inside diameter; maximum lengh of
dead leg permitted 12.0 metres;
for pipes exceeding 19 mm. but not
exceeding 25 mm. inside diameter;
maximum length of dead leg 7.5
metres;
-
-
for pipes with an inside diameter
4
Drawing 1 - Cross-section of the
appliance
8) T&P safety connection
9) Steel jacket
10) Flue baffle
11) Sacrificial anode
12) Drain tap
13) Atmospheric burner
14) Pilot light burner with
thermocouple
1) Draught diverter
2) Hot water outlet
3) Insulation material
4) Flue tube
5) Glass lined tank
6) Gas control valve
7) Cold water inlet pipe
5
1.2 Technical safety equipment
Thermal Reflux Safeguard
The heater is fitted with a flue gas
blowback safety device. The
functioning of the safety device is
based upon the principle of the Thermal
Reflux Safeguard – TRS for short –
shown in Fig.2.
Gas control block
The water heater has been fitted
with a gas control block consisting of a
thermo-electrical pilot flame safeguard,
pilot flame pressure regulator, burner
pressure regulator, a control thermostat
(adjustable between 30°C and 71°C)
and a safety thermostat (82°C). This
gas control block with its simple and
secure control respectively switches
the gas supply to the main burner on or
off.
This TRS can be recognized by the
copper coloured spiral that is fitted to
the lower edge of the draught diverter.
The spiral is connected to a thermostat
by means of a capillary tube. The wiring
of the thermostat must be connected to
the thermocouple circuit.
This gas control block is suitable for
gasses from the first, second and third
gas family. The maximum inlet pressure
is 50 mbar.
1) T.R.S.thermostat
2) Sensor T.R.S. thermostat
3) Thermocouple with built-in
interrupter
Drawing 2 - Gas control block with T.R.S.
4) Thermocouple
5) Gas control block
6) Reset button
7) Pilot burner
8) Temperature regulator knob
6
It is the aim of the T.R.S. to prevent
flue gasses from the water heater
entering the room where the water
heater has been placed, instead of
passing through the flue to outside
atmosphere. The thermo-couple circuit
is interrupted and the gas supply is
disconnected as soon as the T.R.S. is
activated by heating of the sensor by
the hot gasses.
After the cause of the reentry of
flue gasses has been traced the device
can be put back into operation again. In
case of T.R.S. the RESET button has to
be pressed first.
If this failure occurs frequently, this
indicates that the flue suffers from
down draught conditions. We advice
that necessary remedial actions be
carried out by a competent person.
Important
If the water heater is put out of
operation by a failure, this may be
caused by the T.R.S.. If there is a
RESET button on the thermostat this is
visible because the button rose. The
device can be put back into operation
by pressing the RESET-button.
The T.R.S. should never be put
out of operation. Reentry of flue
gasses to the building could be
harmful and cause poisoning or
death.
Attention:
Instruction addition for installer.
Fitting the Thermal Reflux Safeguard:
1. Remove the two screws from the lid;
2. Position the support (with pre-
assembled TRS) onto the lid;
3. Secure the support, using both
screws;
4. Interconnect the male and female
connectors on the lid.
7
1.3 Technicaldescription
1.3.1 Dimensions
These water heaters are only
suitable for a flue tube with minimal the
announced diameter (dimension G).
Dim.
EQ280
EQ380
(ziefig.3)
A
B
D
F
G
K
L
1585
1450
645
1780
1640
675
730
765
130
130
390
390
375
385
M
N
R
S
V
1
1505
1505
285
1685
1685
275
1280
410
1460
410
Cold water inlet
2
Warm water outlet
Gas control block
Drain tap
3
4
5
T&P relief valve tapping
All dimensions are given in mm. (rounded off on 5 mm).
8
Drawing 3 - Dimensions
9
1.3.2 Technical data
Device category: II2H3+
DESCRIPTION
unit
EQ280
EQ380
DATA NATURAL GAS G20 - 20 mbar:
Nominalheatinput(lowervalue)
Nominalpower
kW
kW
22.6
19.2
20
24.0
20.4
20
Inlet-pressure(G20)
mbar
mbar
m3/h
mm
Burnerpressure(G20)
12.5
2.4
8.7
Gasconsumption(G20)*
Diametermainorifice(G20)
Diameterpilotorifice(G20)
Warming-up time DT= 45 K
DATA BUTANE G30 - 30 mbar:
Nominalheatinput(lowervalue)
Nominalpower
2.5
3.90
2X0,27
56
4.50
2X0,27
61
mm
min.
kW
kW
22.6
-
24.0
-
Inlet-pressure(G30)
mbar
30
30
Burnerpressure(G30)
mbar
kg/h
mm
30
1.8
30
1.9
Gasconsumption(G30)*
Diametermainorifice(G30)
Diameterpilotorifice(G30)
Warming-up time DT= 45 K
DATA PROPANE G31 - 37 mbar
Nominalheatinput(lowervalue)
Nominalpower
2.30
2x0.16
-
2.35
2x0.16
-
mm
min.
kW
kW
21.1
-
22.9
-
Inlet-pressure(G31)
mbar
37
37
Burnerpressure(G31)
mbar
kg/h
mm
37
1.6
37
1.8
Gasconsumption(G31)*
Diametermainorifice(G31)
Diameterpilotorifice(G31)
Warming-up time DT= 45 K
2.25
2x0.16
-
2.35
2x0.16
-
mm
min.
10
DESCRIPTION
unit
EQ280
EQ380
GENERAL
Storagecapacity
Waterconnections**
Gasconnection
Draintap
litres
265
355
-
-
-
-
1" - 14 NPT
11/4" - 14 NPT
ISO 7
/
1 Rp 1/2
ISO 7 1 Rp 1/2
/
3/4" - 14 NPT
3/4" - 14 NPT
3/4" - 14 NPT
3/4" - 14 NPT
Anode
T&P-plug
-
3/4" - 14 NPT
3/4" - 14 NPT
Maximumworkingpressure
Emptyweight
bar
kg
8
8
153
178
*
Gasconsumptionat1013,25mbarand15°C
** Foraleak-proofsealedconnectionEuropeancouplingpiecescanbeusedontheNPT-connectionnippleswithapipethread
ofISO228/1
11
2. FORTHEINSTALLER
6644, 6700, 6798 and 6891.
2.1 Installationinstructions
Some chemicals produce vapours
which can cause rapid failure of
thermocouples, burners and storage
tanks if they are drawn into the
combustion air supply.
This water heater must be fitted in a
location which will permit the provision
of an approved flue system and
adequate ventilation.
Therefore if this water heater will
be used to supply hot water to:
A service clearance of 15 cm at the
sides and rear of the unit and 60 cm at
the front of the unit should be allowed
for ease of servicing. Adequate
distance must be allowed between the
top of the unit and any obstruction or
ceiling to allow the flue baffle and
anode to be inspected, cleaned or in the
case of the anode replaced if
-
-
-
hairdressers,
dry cleaners
industrial degreasing processes
or any other area where
compounds containing halogens are
used and stored, care should be taken
that all primary and secondary air is
drawn from outside atmosphere free of
such contaminents.
necessary.
For further advise contact A.O.
SMITH.
The water heater must stand on a
level surface resistant to heat and with
sufficient strength to support the weight
of the unit when full of water.
2.1.2 Water connections
A.O. Smith water heaters are
suitable for connection to vented,
unvented and pumped pressurised
systems. In each case appropriate
valves and fittings should be used to
ensure the system complies with the
requirements of the water by laws, and
appropriate building regulations.
When fitting it is essential the rules
of 'good practice' are applied at all
stages of installation.
This water heater must not be
installed in a bath room, bedroom or in a
cupboard opening on to such rooms.
This water heater must not be installed
in any area where flamable materials
are used or stored.
Insufficient ventilation may give rise
to a risk of fire, explosion or
suffocation. If in doubt consult the
national and local regulations governing
the installation of gas appliances or
your local British gas service depart-
ment.
Vented systems
If the water heater is to be
connected to a cold feed tank or cistern
the hot water supply pipe must include
an open vent which discharges over
the cold feed cistern. The cold feed
cistern must have an actual capacity of
greater volume than the hourly recovery
rate of the water heater(s) which it
supplies.The minimum actual capacity is
50 gallons or 227 litres.
2.1.1 Installation
The installation of this water heater
should be carried out by a suitably
qualified competent person. It is a
criminal offence for unqualified persons
to install gas equipment.
Unvented
Installation should be carried out in
accordance with all local authority and
building regulations, local water
authority and fire regulations and the
following British standards: 5440, 5546,
To install an A.O. Smith water
heater on an unvented cold water
supply system a kit of valves and
fittings listed by the water research
centre and complying with part G3 of
12
Drawing 4 - Connection diagram
(unvented system)
1) Gas cock
8) Pressure limiting valve
2) Stop valve
9) Pressure relief valve
A) Gas supply
B) Hot water outlet
C) Cold water inlet
D) Hot wayer outlets
E) Return circulation loop
3) Expansion vessel
4) T&P safety valve
5) Non return valve
6) Circulationpump
7) Drain valve
the current building regulations should
be used. Installation should be carried
out generally as shown on the following
diagram. See drawing 4.
2.1.3 Gas connection
The gas supply to this appliance
must be installed in accordance with BS
6891 (1988).
A.O. Smith water heaters are tested
to a maximum pressure of 12 bar and a
maximum working pressure of 8 bar.
Fit the 1/2" gas supply cock
supplied with this unit immediately
before the gas control block. No heat or
soldered joints should be applied in the
vicinity of the gas control block, as they
could cause damage to the control.
13
All connections and joints should be
tested for gas soundness with a
suitable leak detector (do not use a
naked flame).
2.1.4. Flue system
The water heater should be fitted
with a flue system connected to the
draught diverter. The flue pipe should
rise for at least 50 cm. vertically before
the inclusion of any bends. If a horizon-
tal run of flue is required this should be
kept to the minimum length possible and
incorporate a rise of 6 cm. per metre of
run. A split clip or flange should be
provided in the flue close to the draught
diverter for ease of servicing.
All flue materials should be
corrosion resistant i.e. stainless steel or
galvanised and must include a tested
and approved terminal to BS 5440 part I.
If the flue passes through any
combustible material measures must be
taken to protect against the possibility of
fire.
All flues must terminate in free air
space approx. 1.5 metres from any
vertical surface of structure i.e.
chimney stacks, roof parapets, etc. If
an existing chimney or flue is to be used
this should be swept clean and be free
of debris before an approved liner is
installed and connected to the water
heater.
2.1.5 Draught diverter
The draught diverted is fitted with a
temperature sensor to signal the
blowback of flue gases.
Important
The T.R.S. should never be put
out of operation. The reentry of
flue gasses may cause poisoning.
14
2.2 Commissioning
5. Keep the control button (✸) pushed-
in for approximately 20 seconds.
After releasing the button the pilot
should remain burning. If the pilot
extinguishes you should wait 5
minutes before repeating the ignition
procedure. The size of the pilot flame
can be adjusted (see also “Pilot
adjustment”).
Filling the water heater
1. Close the drain tap.
2. Open the cold water tap to the water
heater and open all taps where hot
water can be drained for de-
aeration. The water heater is filled
as soon as cold water flows from all
taps.
6. Fit the outer door;
7. Turn the control button to the ‘ON’ ( )
position.
3. Close all hot water taps.
8. Check the burner pressure setting
(see drawing 9) and, if necessary,
adjust this in accordance with the
technical data (see page 10).
9. Place the temperature control button
in the correct position, preferably
position 4 (approximately 60°C). The
appliance will now operate fully
automatically.
Putting into operation
1. Check whether the water-heater
has been filled with water and
whether the gas supply to the water
heater is open.
2. Turn the temperature control knob
clockwise and place the control knob
in the ‘PILOT’-position (✸).
3. Remove the outer door of the
combustion chamber.
4. Keep the control knob pushed-in and
press the piezo-ignitor several times
until the pilot burns (see drawing 6).
Drawing 6 - Operation of the gas
control block
15
2.3
Pilot adjustment
and tilted slightly in the direction of
the drain tap.
The pilot can be adjusted by means
of the regulating screw under the
plastic cover on the right hand side of
the gas control block.
Turn the screw clockwise to
reduce the gas pressure and anti
clockwise to increase the pressure.
Care should be taken to ensure the pilot
covers the thermocouple element
correctly.
2.5 Temperature regulation
The appliance is under water
supply pressure (maximum 8 bar). The
amount of cold water that is added is
equal to the amount of hot water used.
The gas control block automatically
regulates the gas supply. The main
burner will ignite as soon as a reduction
in water temperature is sensed by the
thermostat. The main burner will shut
down as soon as the preset
2.4 Putting out of operation
temperature is achieved.
1. For short periods of time the control
knob should be turned to (✸); the
pilot keeps burning.
2. For longer periods of time the knob
should be turned to the (●) position;
the pilot is extinguished.
Position 1 = approximately 30°C
Position 2 = approximately 40°C
Position 3 = approximately 50°C
Position 4 = approximately 60°C
Position 5 = approximately 70°C
3. Close the gas tap in the supply pipe.
In case of longer interruptions or in
the event of risk of frost it is
At high water temperatures there is
more scale buildup in the appliance. It is
for this reason that it is recommended to
place the temperature control knob in
position 4 as the accumulation of scale
will be reduced. In addition a safety
thermostat has been fitted. This
recommended to also close the cold
water tap and to drain the appliance
after cooling (open the drain tap; it is
possible to connect a drain hose to
the drain tap; open the nearest hot
water drain point to prevent air
locks).
thermostat completely shuts off the gas
supply if the water temperature
To be able to drain the appliance
completely it should be disconnected
reaches 82°C, also extinguishing the
pilot burner.
Drawing 8 - Setting the pilot
16
2.6 Setting the nominal heat
input
The gas control has been factory
preset to the water heater nominal heat
input.
A further check of the burner
pressure should be carried out during
the commissioning of the unit after
installation. The following procedure
should be followed.
straight forward, making the “pr adj”
visible. Turning clockwise reduces
the pressure; turning anti clockwise
increases the pressure. It is
recommended to check the heat
input by means of the gas meter.
4. Turn off the appliance and remove
the manometer hose and replace the
adjusting screw.
5. Relace the thermostat control knob.
6. Put the appliance into operation.
1. Remove the protruding cover screw
on the right side of the gas control
block and connect a U-gauge
2.7 Convertingtoanothertype
of gas
manometer to the outlet.
2. Put the appliance into operation and
ignite the burner.
For conversion of the appliance
from natural gas to another type of gas,
or vice versa, it is necessary to
exchange the pilot injector and the main
injector. The conversion may only be
executed by a qualified competent
person.
3. Check the burner pressure and, if
necessary, reset by means of the
adjusting screw “pr adj” (pressure
adjustment; see drawing 9). To make
this possible the temperature control
knob should be removed by pulling it
Drawing 9 - Setting the nominal load
17
EQ280
EQ380
Unit
G20
G30
G31
G20
G30
G31
Inletpressure
mbar
mbar
mm
20
30
37
20
30
37
Burner pressure
12.5
3.90
30
37
8.7
30
37
Diametermain
injector
2.30
2.25
4.50
2.35
2.35
Diameterpilot
injector
2x
2x
2x
2x
2x
2x
mm
0.27
0.16
0.16
0.27
0.16
0.16
Procedure:
1. Close the main gas tap in the gas
supply.
2. Demount the burner (see “Cleaning”).
3. Replace the injector of the main
burner and the pilot burner with the
correct injectors from the conversion
set (see table above).
Conversion from LP-gas to natural
gas:
- Put the pressure regulator into
operation. To do this the
temperature regulating knob should
be pulled straight forward. Next
the red plastic cover that is now
visible, should be removed. Turn
the ‘no pr’ (no pressure regulation)
screw completely up (see drawing
10).
Conversion from natural gas to LP-
gas:
- Seal this setting with lacquer.
- Remount the burner in reverse
order.
- Open the main gas tap.
- Set the correct burner pressure
(see table above).
- Put the pressure regulation of the
gas control block out of operation.
To do this the temperature
regulating knob should be pulled
straight forward. Turn the ‘no pr’
(no pressure regulation) screw
down tight (see drawing 10).
- Seal this setting with lacquer.
- Remount the burner in reverse
order.
5. If necessary adjust the pilot correctly
(see “Pilot adjustment”).
6. Fit the correct sticker from the
conversion set on the appliance so
that it is clear that the appliance has
been converted and on which gas
the appliance operates.
- Open the main gas tap.
18
Drawing 10 - Conversion to another gas
2.8 Maintenance
anode it should always be replaced by
one of the same type.
To ensure safe and efficient
operation of the water heater it is
recommended that it is cleaned and
serviced at least once a year by a
qualified competent person.
The type of anode required can be
determined on the basis of the type of
the appliance and the serial number.
2.8.2 Cleaning
1. Close the gas supply and demount
the burner after it has cooled down;
2. Disconnect the burner, pilot pipe and
thermo couple from the gas control
block (see drawing 11);
3. Remove the complete burner
assembly;
4. Clean the burner with a soft brush;
5. Check the pilot burner and clean it if
so required;
2.8.1 Sacrificial anode
The life cycle of the anode is
determined by the quality and the
quantity of the water flowing through
the apparatus. It is therefore
recommended that the anode be
inspected and replaced if necessary at
least once a year.
1. Close the stop cock in the cold water
supply pipe.
6. Check the combustion chamber, flue
tube and flue baffle and clean these
if required;
7. Re-mount in reverse order. Tighten
the thermo couple connection on the
gas control block hand tight and
tighten it further with a wrench to a
maximum of 1/4 turn as it only needs
to make contact.
After cleaning of the pilot- and main
burner the operation of these should be
checked. If necessary the burner
pressure of the main burner should be
reset.
2. Open the nearest hot water tap in
order to allow the pressure to drop
from the water heater and the pipes.
3. Slacken the anode with a fitting
wrench.
4. Check the anode and replace it if it
has been reduced in diameter by
60% or more at any point on its
length.
5. Check for water leaks.
If it is necessary to replace the
19
2.8.3 Decalcification
2.9 Inletcombination
Not applicable in U.K. and Ireland.
2.10 Faultfinding
Formation of lime scale depends on
the quality and quantity of the water
used. In addition higher water
temperatures lead to more deposit in the
appliance. A temperature setting of
60°C is recommended in order to keep
the calcification at a low level.
Decalcification should be attempted with
the proper means. For extensive
information a decalcification instruction
is available.
In case of failure the following
should be checked.
Safety thermostat
All appliances have been fitted with
a safety thermostat that shuts off the
gas supply when the water
2.8.4 Spare parts
temperature is too high. The safety
thermostat remains activated until the
water temperature drops below the
safety temperature. The water heater
must be reignited manually. The
regulation thermostat should be set to a
lower water temperature. If the pilot is
extinguished repeatedly at higher
temperatures than normal, this indicates
that the safety thermostat is operating.
To be able to order spare parts it is
important to note the type of appliance
as well as the serial number of the
appliance. Based on this information the
data concerning the spare parts can be
determined.
Drawing 11- Mounting burner-set
20
Flue down draught safety device
If the flue tube safety device has
persists, alert the local gas company
and/or your installer.
switched off the appliance, the
appliance can be put back into operation
through the normal procedure. If the flue
tube safety device repeatedly puts the
appliance out of operation then this
points to problems with the flue. The
only remedy is to determine the cause
of the problem (for instance a blocked
chimney) and to solve the problem.
2.12 Condensation
If the appliance is filled with cold
water or if the hot water consumption is
very high, condensation of flue gasses
will occur on the cold surfaces of the
combustion chamber and the flue tube.
The water drops will fall on the burner
and cause a sizzling noise. This is a
normal phenomenon that will disappear
as soon as the appliance reaches its
normal operating temperature.
Hot water temperature too low
1. Check the setting of the temperature
control knob;
2. Check whether the pilot is alight. If
necessary ignite (see “Putting into
operation”);
2.13 IMPORTANTWARNING
3. Check whether there are any leaks
or open taps;
4. Is the gas supply adequate? Check
and correct if necessary;
5. Perhaps the hot water consumption
is higher than was originally
calculated;
The applicance should NEVER be
taken into operation with a closed
cold water supply!
Provision should always be made
for expansion.
6. Check whether the cold water inlet
has been correctly connected.
7. Check the thermostat sensor for
scale build up.
Hot water temperature too high
Check whether the control
thermostat is set too high.
Possible water leakage
1. Check whether the drain tap is fully
closed;
2. Check whether all water
connections are water tight;
3. Check whether the possible water
leakage could be caused by
condensation.
2.11 Gas smell
Warning
Immediately shut the main gas tap.
Do not light any fire or switch on any
lights, do not use any electrical
switches or alarm bells. Open
windows. Thoroughly inspect all gas
connections and, if the gas smell
21
3.
FORTHEUSER
supply pressure (with a maximum
of 8 bar). The amount of cold water that
is added is equal to the amount of hot
water used. The gas control block
automatically regulates the gas supply.
The main burner will ignite as soon as a
reduction in water temperature is
sensed by the control thermostat. The
main burner will shut down as soon as
the water temperature returns to the
preset temperature.
3.1 Commissioning
Warning
Installing and commissioning of this
water heater should only be carried out
by a qualified competent heating
engineer.
Filling the water heater
Position 1 = approximately 30°C
Position 2 = approximately 40°C
Position 3 = approximately 50°C
Position 4 = approximately 60°C
Position 5 = approximately 70°C
1. Close the drain tap.
2. Open the cold water tap to the water
heater and open all taps where hot
water can be drained for de-
aeration. The water heater is filled
as soon as cold water flows from all
taps.
Higher water temperatures will
cause more scale build up in the
appliance. It is for this reason that it is
recommended to place the temperature
control knob in position 4 as the
accumulation of scale will be reduced at
lower temperatures. In addition a safety
thermostat has been fitted. This
thermostat completely shuts off the gas
supply if the water temperature
reaches 82°C, also extinguishing the
pilot burner.
3. Close all hot water drain taps.
Putting into operation
1. Check whether the device has been
filled with water and whether the
gas supply to the water heater is
open.
2. Turn the temperature control knob
clockwise and place the control knob
inthe‘PILOT’-position(X).
3. Remove the outer door of the
combustion chamber.
3.3 Puttingoutofoperation
4. Keep the control button pushed-in
and press the piezo-ignitor several
times until the pilot burns (see
drawing 6).
5. Keep the control button (✸) pushed-
in for approximately 20 seconds.
After releasing the button the pilot
should remain burning. If the pilot
extinguishes you should wait 5
minutes before repeating the ignition
procedure.
1. For short periods of time the control
knob should be turned to (✸); the
pilot keeps burning.
2. For longer periods of time the knob
should be turned to the (●) position;
the pilot is extinguished.
3. Close the gas tap in the supply pipe.
In case of longer interruptions or in
the event of risk of frost it is
recommended to also close the cold
water tap and to drain the appliance
after cooling (open the drain tap; it is
possible to connect a drain hose to
the drain tap; open the nearest hot
water drain point to prevent
6. Fit the outer door;
7. Turn the control button to the ‘ON’ ( )
position.
8. Place the temperature control button
in the correct position, preferably
position 4 (approximately 60°C). The
appliance will now operate fully
automatically.
airlocks).
To be able to drain the appliance
completely it should be disconnected
and tilted slightly in the direction of
the drain tap.
3.2 Use
The appliance is under water
22
3.4 Faultfinding
Failure
Cause
Measure
Gas smell
Ifyousmellgasyoushouldimmediatelyclosethemaingas
tap youshouldnotlightanyfireorswitchonlight,electrical
switchesorbells.Openwindowsandimmediatelycontact
yourinstallerorthelocalgascompany.
Cleanthepilotburner
Pilotextinguishes
Blockedpilotburner
Findthecauseandremoveit.
Setthetemperatureregulatoratalowertemperature.
Replacethethermocouple
Blockedchimney
Safetythermostat
Thermocoupledefective
Thermocouplemakesnocontact
Gassupplyclosed
Restoretheconnection
Openthegastap
Setthetemperatureregulatoratahighertemperature
Insufficientorno
hotwater
Temperatureissettoolow
Turnthetemperatureregulatorcompletelyclockwise;turn
controlbuttonto“on”( );turnthetemperatureregulatorto
thedesiredposition,preferablyposition4.Theappliance
nowoperatesfullyautomatically.
Controlknobinposition(✸)(pilot
burns)
Puttheapplianceintooperation.
Controlknobinposition(l)
Presstheresetbutton-ifpresent-onthesafetythermostat
andputtheapplianceintooperation.Ifthisoccursmore
oftenthenyoushouldinformyourinstaller.
Fluesafetydeviceclosedthegas
supply
Openthegastapandputtheapplianceintooperation.
Gassupplyclosed
Setthetemperatureregulatoratalowertemperatureand
reignitethepilotburner.
Safetythermostathasclosedthegas
supplybecausethewater
temperaturewastoohigh
Reducetheconsumptionofhotwater.Allowtheappliance
timetoheatthewater.
Hotwaterstorageempty
Turnthecontrolbuttontothe(l)position.Closethegastap
andinformyourinstaller.
Causecannotbedetermined
Condensationof(flue)gasses
See“Condensation”.
Waterleakage
Tightenthethreadedconnections.
Insufficientsealingofthewater
connections(thread)
Tracethecause.
Leakagefromotherwater-appliances
orpipesnearby
23
4.GUARANTEE
d) in a non corrosive atmosphere or
area;
The following conditions form the
guarantee agreement between A.O.
Smith Water Products Company (the
warrantor) and the owner of the water
heater.
e) with an approved temperature and
pressure relief valve of adequate
capacity not exceeding the working
pressure rating shown on the water
heater, and installed in conformity
with A.O. Smith Water Products
Companies installation instructions;
f) when anode(s) have been inspected
and renewed, if they are worn or
erroded by 50% of more at any point
of their length.
4.1 Guarantee in general
If within one year of the original
installation date of the water heater any
part or component other than the tank
shall prove upon examination by the
warrantor or authorised agent to be
defective in material or workmanship,
the warrantor will exchange such part
or component.
4.4 Exclusions
The guarantee will be null and void:
a) if the water heater has been
damaged by an external cause;
b) in case of misuse, neglect (including
frost damage) or incorrect use of the
water heater;
c) in case of unauthorised alteration,
modification or repair;
d) in case of ingress into the water
heater of chemicals, pollutants or
contaminants;
4.2 Guarantee of the tank
If within 3 years of the original
installation date, the tank fails due to
rust or corrosion from the water side,
the warrantor will supply a complete
new water heater of equivalent size
and duty (excluding delivery and
installation charges). On the
replacement water heater a guarantee
will be granted sufficient to cover the
unexpired portion of the original 3 year
guarantee of the originally installed
water heater.
e) if the hardness of the incoming
water is, or has been, softened
below 60 ppm CaCO3 ;
f) if the water heater is effected by
corrosive vapours such as those
found in hairdressers, dry cleaners
and laundries or where some
industrial degreasing products are
used and stored (for further
information and advise please
contact the A.O. Smith Technical
Department).
4.3 Conditionsforinstallation
and use
The guarantee applies to the heater
only while it remains in its orignial
location, and is installed in accordance
with local plumbing and building
regulations and all relevant Codes of
Practice.
4.5 Range of guarantee
All replacement water heaters supplied
under the terms of this warranty will be
supplied ex stock on an F.O.B. basis.
A.O. Smith accepts no responsability
for carriage, labour or other installation
costs.
The water heater should also have
been used only:
a) for potable water free to circulate at
all times and with the tank free of
damaging scale deposits;
b) at temperatures not exceeding the
maximum setting of its thermostat
and ECO (Energy Cut Off device);
c) at water pressures and/or energy
inputs which do not exceed those
stated on the rating plate of the
water heater;
4.6 Claims
Any claim under this warranty
should be initiated with the dealer who
originally sold the water heater or with
any other dealer or stockist of the
warrantors products.
24
4.7
No other guarantee or
warranty either expressed
or implied is made on
behalf of A.O. Smith Water
ProductsCompany.
With respect to the water heater in
question further A.O. Smith does not
guarantee this water heater as suitable
for purpose except within the terms of
warranty detailed above.
A.O. Smith Water Products
Company will not be liable by virtue of
this guarantee or otherwise for damage
to any persons or property when
arising out of contracts or tort.
The terms of this guarantee do not
effect your statutory rights under United
Kingdom Consumer Legislation.
25
26
Important
This form should be filled in completely
within two weeks of installation.
MODEL: .........................................................................................................................
SERIALNUMBER: .........................................................................................................
ORIGINALDATEOFINSTALLATION: ............................................................................
NAMEOWNER: .............................................................................................................
ADDRESS: ....................................................................................................................
TOWN: ..........................................................................................................................
(STAMP)INSTALLER: ...................................................................................................
27
0308 645 R0
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