A.O. Smith Epsilon EB-40 Manual

0310 349
Innovation has a name.
Light Commercial High Efficiency
Condensing Boiler
EB - 40/50
Epsilon
Installation and Service
Manual
These instructions should be retained by user.
XX.XX.XXX/XX.XX
Changes reserved. E.& O. E.
8G.51.90.04 / 10.17 Changes reserved. E. & O. E.

Installation and Service Manual Epsilon-Series
2
Central heating  on/o
Domestic hot water (DHW) on/o
Pump program on/o
Reset key Unlocking the boiler
in case of error
Step key Selecting chapters
display
Explanations of symbols and signs on the Control Tower display.
1
2
No heat requirement
Ventilation phase
Ignition phase
Burner active on central heating
Burner active on hot water
Fan check
Burner o󰀨 when room thermostat is demanding
Pump overrun phase for central heating
Pump overrun phase for hot water
Burner o󰀨 because of to high ow water temperature
Automatic venting program
3
4
5
6
7
8
9
A
Water pressure is to low (<1,0 bar), a-
shing FILL will alternate with indication
of water pressure, boiler power of 50%
is possible. The installation needs to be
topped up.
Operation indication
(in the rst display position by technical read out)
Last postion shows the actual ow temperature
Mode key Selecting chapters
Water pressure is to high (>2,8 bar), if
HIGH indication remains continuously vi-
sible, the boiler is taken out of operation.
The installation pressure needs to be
decreased by draining water.
Water pressure is to low (<0,7 bar), FILL
indication remains continuously visible,
the boiler is taken out of operation. The
installation needs to be topped up.
0
From Good-read out to Technical read out (and vice versa):
- Press 5 sec. on the STEP key.

Installation and Service Manual Epsilon-Series
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Content
1 Introduction ....................................................................................................................................4
2 Rules ............................................................................................................................................6
3 Scope of the supply........................................................................................................................8
4 Description of the boiler .................................................................................................................8
5 Mounting the boiler.........................................................................................................................9
6 Connecting the boiler ...................................................................................................................10
6.1 Central heating system .....................................................................................................10
6.2 Expansion vessel ..............................................................................................................12
6.3 Water quality .....................................................................................................................12
6.4 Underoor heating system (plastic pipes).........................................................................15
6.5 Gas connection .................................................................................................................15
6.6 Condensation drain pipe ...................................................................................................16
6.7 Flue gas exhaust system and air supply system ..............................................................17
6.7.1 Dimensions of the ue gas and air intake duct .................................................................21
7 Electrical connection ....................................................................................................................21
8 Boiler controls ..............................................................................................................................23
8.1 Explanation of the function keys .......................................................................................24
9 Filling and venting the boiler and installation ...............................................................................25
10 Commissioning the boiler.............................................................................................................26
10.1 Central heating system .....................................................................................................26
10.2 Adjustments ......................................................................................................................27
10.3 Activating factory settings (green key function) ................................................................29
11 Isolating the boiler .......................................................................................................................30
12 Commissioning.............................................................................................................................30
12.1 Checking for contamination ..............................................................................................31
12.2 Checking the O2...............................................................................................................32
12.3 Maintenance activities.......................................................................................................33
12.4 Draining the installation.....................................................................................................37
12.5 User's instructions.............................................................................................................37
12.6 Maintanance frequency.....................................................................................................37
13 Error indication .............................................................................................................................38
14 Warranty conditions......................................................................................................................39
14.1 General warranty ..............................................................................................................39
14.2 Heat exchanger warranty..................................................................................................39
14.3 Conditions for installation and use ....................................................................................39
14.4 Exclusions.........................................................................................................................40
14.5 Scope of the warranty .......................................................................................................40
14.6 Claims ...............................................................................................................................40
14.7 Obligations of A.O. Smith Water Heaters..........................................................................40
Annex A Technical specications .................................................................................................41
Annex B System water additives..................................................................................................42
Annex C Dimensions....................................................................................................................43
Annex D Installation examples.....................................................................................................45
Annex E Declaration of conformity...............................................................................................47
Work on the installation should only be carried out by qualied personnel with
calibrated equipment.

Installation and Service Manual Epsilon-Series
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1 Introduction
These instructions describe the functioning, installation, use and primary maintenance of
A.O. Smith central heating units for the United Kingdom and Ireland. Where necessary
the di󰀨erent regulations for each country are separately described.
These instructions are intended for the use by Gas Safe Register approved contractors or
registered Bord Gais installers in connection with the installation and putting into operation
of A.O. Smith boilers. It is advisable to read these instructions thoroughly, well in advance
of installation. Separate instructions for use are supplied with the boiler for users of A.O.
Smith central heating boilers. A.O. Smith is not liable for the consequences of mistakes or
shortcomings which have found their way into the installation instructions or user’s manual.
Further, A.O. Smith reserves the right to alter its products without prior notication.
When delivering the unit, give the customer clear instructions concerning its use;
present the customer with the user’s manual.
Each unit is tted with an identication plate. Consult the details on this plate to verify
whether the unit is compliant with its intended location, e.g.: gas type, power source and
exhaust classication.

Installation and Service Manual Epsilon-Series
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1 heat exchanger
2 ignition unit
3 fan unit
4 air inlet damper
5 gas valve
6 safety valve
7 automatic air vent
8 ceramic burner cassette
9 operating panel
10 Control Tower (CMS)
11 water lter return CH
12 circulation pump
13 ue gas discharge
14 combustion air supply
T1 ow sensor
T2 return sensor
P1 water pressure sensor
EpsilonEB40            gure1.a
4 2 1 3 145 13 7 15 6
C
12
G
16 9
T1
8
10
T2
P1
RA
15 air box
16 identication plate
G gas pipe
A ow connection central heating
R return connection central heating
C condensate pipe
11

Installation and Service Manual Epsilon-Series
6
2 Rules
The following regulations apply to installation of A.O. Smith central heating boilers:
Legislation and Regulations.
Gas Safety (Installation and Use). All gas appliances must by law, be installed by a competent
person, eg. Members of Gas Safe Register and in accordance with the current Gas Safety
Regulation. Failure to install appliance correctly could lead to prosecution.
All Gas Safe registered installers carry a Gas Safe ID card and have a registration number.
You can call Gas Safe Register directly on 0800 408 5577.
In addition to the above regulations this appliance must be installed in compliance with the
current IEE Regulations, the Building Standards (Scotland Consolidation) Regulations.
Regulations and byelaws of the Local Water Authority and the Current Health and Safety
Regulation.
Ireland:
- Irish standard 813
- Domestic gas installations
The current, Electricity at Work Regulation must be complied with and also be in
accordance with the relevant and current editions of the British Standards.
The A.O. Smith Epsilon boiler is a certied appliance and must not be modied or installed
in any way contrary to this Installation Manual. Manufacturers instructions must not be
taken in any way as overriding statutory obligations.
The Epsilon is a central heating unit with an optional integrated hot water function. These
units must be connected according to these instructions and all installation norms in
respect of the part of the unit to be connected.
The appliance is not to be used by children or persons with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction
Children being supervised not to play with the appliance
Observe the following rules of safety:
- All work on the boiler must take place in a dry environment.
- Epsilon boilers may never be in operation without their housing, except in connection
with maintenance or adjustments (see Chapter 12).
- Never allow electrical or electronic components to come into contact with water.
Carry out the following tasks in connection with maintenance, etc. to an already-installed
unit:
- Shut down all programs
- Close the gas tap
- Remove the plug from the wall socket
- Close the stop cock of the unit’s intake connection

Installation and Service Manual Epsilon-Series
7
Take note of the following when maintenance or adjustments are needed:
- The unit must be able to function during these activities; for this reason, the unit’s
supply voltage, gas pressure and water pressure must be maintained. Ensure that
these is not a source of potential danger during these activities.
Following maintenance or other activities; always check the installation of all parts
through which gas ows (using leak-search spray).
Following maintenance or other activities, always replace the housing and secure
it with the screw behind the door at the front of the casing.
The following (safety) symbols may be encountered in these installation instructions and
on the unit:
This symbol indicates that the unit must be stored away from frost.
This symbol indicates that the packaging and/or contents can be damaged as a
result of insu󰀩cient care taken during transport.
This symbol indicates that, whilst still in its packaging, the unit must be
protected from weather conditions during transport and storage.
KEY-symbol. This symbol indicates that assembly or dismantling, must be
carried out.
ATTENTION symbol. This symbol indicates that extra attention must be paid in
connection with a particular operation.
Useful tip or advice

Installation and Service Manual Epsilon-Series
8
3 Scope of the supply
The boiler is supplied ready for use. The supply kit is composed as follows:
• Boiler with casing; • Gas isolation valve;
• Automatic vent (inside the boiler); • Template on the package wrapper;
• Safety valve (inside the boiler); • Installation and Service Manual;
• Suspension bracket; • User Manual.
• Draining valve with T-piece;
• Fixing material consisting of plugs and
screws;
4 Description of the boiler
The Epsilon boiler is a room sealed, condensing and modulating central heating boiler.
The boiler is provided with a compact stainless steel heat exchanger with smooth tubes.
A well thought out principal using durable materials.
The boiler burns gas for supplying warmth. The heat is transferred in the heat exchanger
to the water in the central heating system. By cooling down the ue gasses condensate is
formed. This results in high e󰀩ciency. The condensate, which has no e󰀨ect on the heat
exchanger and the function of the boiler, is drained through an internal siphon.
The boiler is provided with an intelligent control system (CMS Control Management
System). The boiler anticipates the heat demand of the central heating system or the
hot water facility.
When an outside sensor is connected to the boiler works weather dependantly. This
means that the boiler control measures the outside temperature and ow temperature.
With this data the boiler calculates the optimal ow temperature for the installation.
Explanation of the type indication: Epsilon EB 40
Epsilon = Serie
EB = Type
40 = Load indication in kW
The boiler has been tested according to valid CE standards.
Statement: No banned materials including asbestos, mercury, CFC's have not or will not
be included in the product.
Room sealed boiler
The boiler retreives its
combustion air to out-
side then discharges
the ue gasses to the
outside.
Condensing
Retrieves heat from
the ue gasses. Water
condensates on the
heat exchanger.
Modulating
Higher or lower burning
according to the heat
demand.
Stainless
Super solid kind of
steel which keeps its
quality for life. It will
not rust or erode in
contrast to composition
materials, like alumi-
nium.

Installation and Service Manual Epsilon-Series
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5 Mounting the boiler
Install the boiler in a well-ventilated boiler room in accordance to the actual
regulations.
The room where the boiler will be placed must always be frost free.
It is NOT necessary to have a purpose provided air vent in the room or internal space in
which the boiler is installed. Neither is it necessary to ventilate a cupboard or compartment
in which the boiler is installed, due to the extremely low surface temperature of the
boiler casing during operation. Therefore the requirements of BS 6798, Clause 12, and
BS5440:2 may be disregarded.
The boiler can be mounted practically to any wall with the suspension bracket and the
enclosed xing equipment. The wall must be at and of su󰀩cient strength in order to be
able to carry the boiler weight with its water content.
Above the boiler there must be at least 250 mm working space in order to be able to t a
coaxial ue system or a twin supply. On the left side of the boiler at least 50 mm and on
the right side 10 mm must be reserved to allow tting or removing of casing. The location
of the boiler can be determined by using the template located inside the boiler packaging.
Lift the boiler only by the boilers rear wall.
Lifting and carrying precautions:
- Lift only a manageable weight, or ask for help.
- When lifting the boiler, bend the knees, and keep the back straight and feet
apart.
- Do not lift and twist at the same time.
- Lift and carry the boiler close to the body.
- Wear protective clothing and gloves to protect from any sharp edges.

Installation and Service Manual Epsilon-Series
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6 Connecting the boiler
The boiler has the following connection pipes;
- The central heating pipes.
Thesecanbeconnectedtotheinstallationbymeansofcompressionttings;
- The gas pipe.
Itisprovidedwithafemalethreadintowhichthetailpieceofthesuppliedgasisolation
valvecanbescrewed;
- The condensation drain pipe.
It consists of an oval 24 mm plastic pipe. The drain pipe can be connected to this by
meansofanopenconnection.Iftheopenconnectionisttedinadierentlocation,
thenthepipecanbelengthenedbymeansofa32mmPVCsleeve;
- The ue gas exhaust system and air supply system.
Itconsistsofaconcentricconnection80/125mm.
It is recommended that isolation valves are tted to all heating and hot water
connections to facilitate ease of future maintenance.
It is advisable to spray-clean all of the unit’s connecting pipes and/or to spray-
clean/blow-clean the installation before connecting it to the unit.
6.1 Central heating system
Connect the central heating system according to the actual regulations.
The boiler pipes can be connected to the installation by means of compression ttings.
Reducers should be used for connecting to thick-walled pipe (welded or threaded).
When removing the plastic sealing caps from the pipes, contaminated testing
water may be released.
The boiler has a self-adjusting and self-protecting control system for the load and the pump
capacity. By this means the temperature di󰀨erence between the ow and return water is
checked. Table 6.1.a shows the water displacement which supplies the circulation pump
at certain installation resistance.
A low velocity header must be connected to the EB 50 to prevent ow problems
over the boiler.
A.O. Smith supplies the low velocity header for 1 boiler with art.nr. 0310372. This can
be connected directly under the boiler on the ow and return pipe.
Boiler type Pump type
UPM2 l/min l/h kPa mbar
EB 40 20-70 24,6 1478 20 200
EB 50 20-70 Low velocity header required
Permissible installation
restistanceWater flow rate
Installationresistance        table6.1.a

Installation and Service Manual Epsilon-Series
11
If the installation resistance is higher than the stated value the pump will rotate at
maximum pump capacity and the load will be adjusted until an acceptable temperature
di󰀨erence between ow and return water has been obtained. If, after this, the temperature
di󰀨erence remains to much then the boiler will switch itself o󰀨 and wait until an acceptable
temperature has arisen.
If an unacceptable temperature is detected, then the control will repeatedly try to achieve
water ow, and if this does not work then the boiler will switch o󰀨.
If the capacity of the boiler pump is insu󰀩cient, an extra external pump can be installed
in combination with a low velocity header in series with the boiler. The electrical side of
this external circulation pump can be connected in the Control Tower, by which means
this pump switches at the same times as the boiler pump.
The maximum absorbed current consumption of the external circulation pump may be
230 W (1 Amp). The extra external pump must be selected according the installation
resistance and required ow.
pumpindexlines    graph6.1.a
As standard the boiler is provided with a water lter in the return pipe of the boiler. With
this, possible contamination of the central heating water is prevented from ending up in
the boiler. The boiler is also provided with an internal safety valve set at 3 bar. This is
connected to the waste discharge together with the condensation discharge.
If all, or a large part of the radiators are provided with thermostatic radiator valves it is
advisable to use a pressure di󰀨erence control (bypass) in order to prevent ow problems
in the installation.
The boiler is designed to be used on sealed system only.
Additives in the installation water are only permitted in consultation with the
country distributor.
external installation pump with low
velocity header
gure 6.1.a
Q(m³/h)
EB 40
H(m)

Installation and Service Manual Epsilon-Series
12
6.2 Expansion vessel
The central heating system must be provided with an expansion vessel. The expansion
vessel which is used should be geared to the water content of the installation. The pre-
charge pressure depends on the installation height above the mounted expansion vessel.
See table 6.2.a.
The Solo boilers EB 40 and EB 50 are not provided with an expansion vessel
connection. When one of these Solo boilers is combined with a cylinder then
one has to take into account that the expansion vessel should be connected
between the three-way valve and the boiler circulation pump.
6.3 Water quality
Fill the installation with drinking water.
In most cases, a heating system can be lled with water according to national standards
for water and is treatment of this water not necessary.
In order to avoid problems with the CH-installations, the quality of the lling water has to
meet the specications mentioned in table 6.3.a:
If the lling water does not meet the required specications, you are advised to treat the
water to such an extent that it does meet the required specications.
The warranty becomes invalid, if the installation is not being ushed and/or the
quality of the lling water does not meet the specications recommended by
A.O. Smith. Always contact A.O. Smith in advance, if things are not clear or you
wish to discuss any deviations. Without approval, the warranty becomes invalid.
Installation:
- The use of groundwater, demi-water and distilled water is prohibited. (on the next
page you will nd an explanation of these denitions)
- If the drinking water quality meets the specications mentioned in table 6.3.a, you
can start ushing the installation before installing the device.
- Whilst ushing, corrosion products (magnetite), tting products, cutting oil and other
undesirable products have to be removed.
- Another possibility is to remove the pollution by installing a lter. The lter type has
to t the type and grain size of the pollution. A.O. Smith recommends lter usage.
- In this case, the whole piping system should be taken into consideration.
- The CH-installation has to be properly vented before using the system. For that pur-
pose, we refer to the commissioning chapter.
- If a regular water top up is required (>5% on an annual basis), then there is a structural
problem and an installer has to solve the problem. Regularly adding fresh water to the
system also adds additional calcium and oxygen implying that magnetite and calcium
residues can continue. The result may be blockages and/or leakages.
- The use of anti-freeze and other additives requires periodical quality checks of the
lling water in accordance with the period laid down by the additives supplier.
- Chemical additions are to be avoided and should only be used after A.O. Smith has
approved their corresponding use.
choiceofexpansionvessel       table6.2.a
installation height above
the expansion vessel
pre-charge pressure
of the expansion vessel
5 m 0,5 bar
10 m 1,0 bar
15 m 1,5 bar

Installation and Service Manual Epsilon-Series
13
- Should you wish to achieve the required water quality by using chemical addi-
tives, then this is your own responsibility. The warranty on the product delivered by
A.O. Smith expires, if the water quality does not meet A.O. Smith's specications or
the chemical additives have not been approved by A.O. Smith.
- On installation and during additions or changes at a later stage, A.O. Smith recom-
mends to keep a record of the type of water used, its quality at the time, and if ap-
plicable, which additives and quantities were added.
Parameter Value
Water type Potable water
Softened water 6.0-8.5
pH 6.0-8.5
Conductivity (at 20°C in µS/cm) Max. 2500
Iron (ppm) Max. 0.2
Hardness (°dH)
Installation volume/capacity 1-7
<20 l/kW 1-12
Installation volume/capacity Refer to Additives Attachment
>=20 l/kW 1-7
Oxygen No oxygen di󰀨usion allowed during ope-
ration.
Max. 5% lling water addition annually Refer to Additives Attachment
Corrosion inhibitors Refer to Additives Attachment
pH increasing or lowering agents Refer to Additives Attachment
Anti-freeze additives Refer to Additives Attachment
Other chemical additives Refer to Additives Attachment
Solid substances Not allowed
Residues of processing water not for-
ming part of the drinking water
Not allowed
table 6.3.a
Water type denition:
Potable water: Tap water compliant with the European drinking water guideline:
98/83/EG dated 3 November 1998.
Softened water: Water with partly de-ionised calcium and magnesium.
Demi-water: Virtually completely demineralised water (very low conductivity)
Distilled water: Water no longer containing minerals.

Installation and Service Manual Epsilon-Series
14
6.4 Underoor heating system (plastic pipes)
When connecting or using an underoor heating system, designed with plastic pipes, or
plastic pipes are used elsewhere in the installation,one should ensure that the plastic
pipes used comply with the DIN 4726/4729 standard. It is set out in this standard that the
pipes may not have oxygen permeability higher than 0.1 g/m³.d at 40°C. If the system
does not comply with this DIN standard, the underoor heating component will have to
be separated from the central heating appliance by means of a plate exchanger.
No recourse can be made to the terms of the warranty in the event of failure to
observe the regulations pertaining to plastic underoor heating pipes.
6.5 Gas connection
The appliance pipe is tted with an internal thread, into which the tail piece of the gas
isolation valve can be screwed.
United Kingdom:
The gas supply must comply to the current Gas Safety, Installation & Use Regulations.
Ireland:
- Irish standard 813
- Domestic gas installations
The connection to the appliance must include a suitable method of disconnection and a
gas control cock must be installed adjacent to the appliance for isolation purposes. The
nominal inlet working gas pressure measured at the appliance should be 20 mbar for Nat
gas (G20).
With regard to new lines in particular, ensure that the gas line does not contain
any residual pollution.
The Epsilon boilers can be converted from natural-gas to propane/lpg and from propane/
lpg to natural-gas. When the boiler has to be converted, A.O. Smith provides special kits
for this purpose. Special instructions are supplied with the kit.
The lpg-gas has to have a propane purity of at least 90%. When the butane-level
is greater then 10% the warranty conditions on the heat exchangers are not
valid.
Following maintenance tasks always check all gas-conducting components on
leakages by means of leakage detection spray

Installation and Service Manual Epsilon-Series
15
6.6 Condensation drain pipe
All A.O. Smith wall hung gas red condensing boilers contain a syphonic condensate
trap to collect and release condensate.
The amount of condensate formed is determind by the type of boilers and the water
temperature produced by the boiler.
Condensate pipework.
Press the supplied plastic ribbon tube onto the condensate drain at the bottom of the
boiler (g. 6.6.a). Connect the tube to the main condensate drain (minimum diameter=
40mm) by means of an open connection to avoid sewage gasses coming into the boiler.
Fit a pipe work header for the condensate drain behind the hydraulic system. For that
purpose, the ange plates have holes allowing the installation of a PVC drain of ø40mm
max. Use this drain to connect the individual condensate drains of each boiler.
The syphon of a ue gas system can also be connected, if required, by means of an
open connection.
Routing of the pipework,
Wherever possible, the condensate pipework should be routed internally to prevent
freezing.
The condensate pipework must fall at least 50mm per metre towards the outlet and take
the shortest possible route
Support the pipe at least every 50 cm for near horizontal sections and 1 metre for vertical
sections
External pipework
The pipework should be kept to a minimum and the route as vertical as possible.
Do not exceed 3 metres outside the dwelling.
The condensate pipe must be run using suitable corrosion resistant materials (eg. plastic).
Terminate as close to the ground or drain as possible (below the grating and above the
water level) while still allowing for safe dispersal of the condensate.
Connection of a condensate drainage pipe to a drain may be subject to local building
controls.
Pipework subjected to extreme cold or wind chill conditions should be in a 40mm diameter
pipe.
Protect all external pipework with weather resistant insulation and, if necessary, box in,
to reduce the risk of freezing.
Making it safe.
Condensate pipework must not leak, freeze or block up.
Condensate traps must be lled before ring the boiler to prevent the possibility of potential
harmful ue products evacuating via the condensate route.
Do not dispose condensate into a water recovery system where it is reclaimed for reuse.
Condensate can be discharged into a rainwater hopper which is part of a sewer carrying
both rain water and foul water.
Condensate drain connection
  gure6.6.a

Installation and Service Manual Epsilon-Series
16
Final discharge options.
The condensate pipe can only terminate into any one of the ve areas as shown in the
gures on this page.
Draining of the condensation water to the external rain guttering is not
permitted in view of the danger of freezing.
Before putting the boiler into operation ll the syphon with 600 ml of
water.
A -Condensate from boiler syphon/trap
B -Sink with internal overow
C -25mm dia. Plastic condensate pipe
D -External drain or gully
E -Internal soil and vent stack.
F -Serviceable condensate trap (75mm min.)
G -300mm x 100mm dia. sealed plastic tube.
H -Ground level
J -Drainage holes facing away from the building
K -Lime stone chippings
L -Weather resistant insulation
Drainrequirements     gure6.6.b 
K

Installation and Service Manual Epsilon-Series
17
6.7 Flue gas exhaust system and air supply system
The ue gas exhaust system and air supply system consists of:
- Flue gas pipe;
- Air supply pipe;
- Roof or wall terminal.
The ue gas exhaust system and air supply system must comply with:
United Kingdom:
The ue gas outlet and air supply installation must comply with the current regulation
requirements. IG UP 10 and BS 715.
Ireland:
- Irish standard is 813 section 9.10.1
Open boiler
Room sealed system
SS
P
SS
P
P
SS
P
Openboilerenroomsealedsystem          gure6.7.a
P
P/A P/A P/A
All ue gas parts, which are outside the re
resistant cover, need to be in stainless steel.
Boiler Class C
Permitted only
when the air
intake and the ue gas
outlet are in the same
pressure area.
BoilerClass B
Free exhaust area
Airlter
Legenda:
SS = Stainless Steel
P = Polypropyleen
A = Aluminium

Installation and Service Manual Epsilon-Series
18
Furthermore:
- Boiler Class indicated on the boiler’s type plate (Flue category)
- Locally applicable rules.
- The supplier’s installation instructions
When in doubt or if you have any questions, always contact A.O. Smith.
The appliance connection diameter is 80/125 mm, to which the ue gas outlet and air
supply system can be tted, with or without elbow pieces. The maximum permissible
pipe length is set out in Table 6.7.1.a.
Boiler conversion from concentric to parallel
It is also possible to use a parallel pipe connection of 2x 80mm. In this case a conversion
kit 'concentric to parallel' should be ordered. Art.nr. 0310373(S).
A. 1. Push the 2 clips slightly outwards.
B. 2. Pull the concentric adaptor out of the boiler.
3. Press the cover in the connection at the back from inside out.
C. 4. Pull the rubber seal around the bottom of the ue connector.
5. Push the ue connector in the boiler, in the boiler ue pipe until
‘CLICK’.
6. Push the ø125mm cover over the ue connector in the ø125mm
opening until ‘CLICK’.
7. Push the rubber plug in open position in the O2measuring opening and
close the stop.
8. Push the gasket around the top of the ue connector.
D. Connect the parallel ue gas and air intake system (2x ø80mm).
A
1
B
2
3
C
4
7
5
6
8
D
boiler conversion from concentric to
parallel
  gure6.7.b

Installation and Service Manual Epsilon-Series
19
We advise to build a simple ue gas system and air supply system. For further information
about the available components of the ue gas and air supply system we recommend
you to contact A.O. Smith.
The A.O. Smith ue gas system is meant and designed solely the use on
A.O. Smith central heating boilers adjusted for Nat gas or LPG. The maximum ue gas
temperatures are below 70°C (full load 80/60°C)
The proper operation can be inuenced harmfully by changes of or adjustments to the
correct set up.
Possible warranty claims will not be honoured if incorrect changes result in non compliance
with the installation manual or local rules and regulations.
The ue gas system should be built up using only A.O. Smith program products. Com-
binations with other brands or systems are without written permission from A.O. Smith
is not permitted.
Horizontal ue system should always be installed sloping towards the boiler, in order to
avoid condensate lying in the ue system.
The minimum gradient is 50mm/Mtr. With the condensate running back to the boiler the
risk of ice forming at the terminal is reduced.
The terminal should be located where dispersal of combustion products is not impeded
and with due regard for the damage or discolouration that might occur to building products
in the vicinity (see g 6.7.c).
In certain weather conditions condensation may also accumulate on the outside of the
air inlet pipe. Such conditions must be considered and where necessary insulation of
the inlet pipe may be required.
In cold and/or humid weather water vapour may condense on leaving the ue terminal.
The e󰀨ect of such ‘plumeing’ must be considered.
terminal position for fan assisted boiler minimum
distance
Adirectly below an open window or other opening
(e.g. air brick) mm 300
Bbelow gutters, soil pipes or drain pipes mm 75
Cbelow eaves mm 200
Dbelow balconies or car port roof mm 200
Efrom vertical drain pipes and soil pipes mm 75
Ffrom internal or external corners mm 300
Gabove ground or below balcony level mm 300
Hfrom a surface facing a terminal mm 600
Ifrom a terminal facing a terminal mm 1200
Jfrom an opening in the car port (e.g. door
window) into dwelling mm 1200
Kvertically from a terminal on the same wall mm 1500
Lhorizontally from a terminal on the same wall mm 300
Mhorizontally from a vertical terminal to a wall mm 300
Dimensions     table6.7.a
gure 6.7.c

Installation and Service Manual Epsilon-Series
20
The terminal must not be located in a place where it is likely to cause a nuisance.
For protection of combustibles, refer to IS 813 section 9.10.1. where the terminal is less
than 2m (6.6ft) above a pavement or platform to which people have access (including)
any balcony or at roof the terminal must be protected by a guard of durable material.
Contact A.O. Smith for a suitable guard.
Where a terminal is tted below a window which is hinged at the top, and where
the hinge axis is horizontal, and the window opens outwards, the terminal shall
be 1m below the bottom of the window opening.
If the boiler is to be located under stairs, a smoke alarm meeting the
requirements of I.S. 409 or equivalent must be tted.
The ue must be terminated in a place not likely to cause a nuisance.
For horizontal sections, the outlet system should always be tted on an incline (50
mm/m) sloping down towards the appliance so that no condensation water is able to
accumulate in the outlet system. The chances of icicles forming on the roof outlet is
minimised by causing the condensation water to run back towards the appliance. In the
case of horizontal outlets the inlet system should be tted on an incline sloping down
towards the outside to prevent rainwater from coming in.
The appliance produces a white wisp of condensation (plumeing). This wisp of
condensation is harmless, but can be unattractive, particularly in the case of outlets in
outside walls.
The connection for the ue gas/air intake system is from standard concentric 80/125mm.
The ue gas duct for the 80/125 is a push t connection and can be increased to 100/150
by means of an adapter tting. See table 6.7.1.a for maximum ue length.
Cutting the pipe goes as follows:
- Cut just as much from the air intake part as from the ue gas part using a hand saw;
- Take o󰀨 the burrs from the cutting edge to prevent cutting the seals;
When mounting the ue gas system, pay attention to the ow direction (See gue 6.7.e).
It is not permitted to mount a system upside down and will lead to complaints.
Use a soap solvent or special grease to simplify the tting.
FlowdirectionFigure6.7.e
InstallationheightFigure6.7.d