Atag Q 25S Release note

8G.51.40.06/08.15 Changes reserved.
Installation & Servicing
Instructions
These instructions to be retained by user.
Boiler G.C No
Q 25S 41-310-08
Q 38S 41-310-09
Q 51S 41-310-10
Q 60S 41-310-11
Q 25C 47-310-10
Q 38C 47-310-11
Q 51C 47-310-12
CE PIN 0063BQ3021

Installation & Servicing Instructions ATAG Q-Series
2
Central heating on / off
Domestic hot water (DHW) on / off
Pump programme on / off
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 off when room thermostat is demanding
Pump overrun phase for central heating
Pump overrun phase for hot water
Burner off because of to high ow water temperature
Automatic venting programme
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)
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 & Servicing Instructions ATAG Q-Series
3
Content
1 Introduction ....................................................................................................................................4
2 Rules ............................................................................................................................................4
3 Scope of the supply........................................................................................................................6
4 Description of the boiler .................................................................................................................6
5 Mounting the boiler.........................................................................................................................8
6 Connecting the boiler .....................................................................................................................9
6.1 Central heating system .......................................................................................................9
6.2 Expansion vessel .............................................................................................................. 11
6.3 Underoor heating system (plastic pipes).........................................................................12
6.4 Water quality .....................................................................................................................12
6.5 Gas connection .................................................................................................................14
6.6 Hot water supply ...............................................................................................................14
6.7 Condensation drain pipe ...................................................................................................15
6.8 Flue gas exhaust system and air supply system ..............................................................18
6.8.1 Dimensions of the ue gas and air intake duct .................................................................22
7 External hot water cylinders .........................................................................................................23
8 Electrical connection ....................................................................................................................24
9 Boiler controls ..............................................................................................................................26
9.1 Explanation of the function keys .......................................................................................27
10 Filling and venting the boiler and installation ...............................................................................28
10.1 Hot water supply ...............................................................................................................28
11 Commissioning the boiler.............................................................................................................29
11.1 Central heating system .....................................................................................................29
11.2 Hot water supply ...............................................................................................................29
11.3 Adjustments ......................................................................................................................30
11.4 Activating factory settings (green key function) ................................................................32
12 Isolating the boiler .......................................................................................................................33
13 Commissioning.............................................................................................................................33
13.1 Checking for contamination ..............................................................................................34
13.2 Checking the O2...............................................................................................................35
13.3 Maintenance activities.......................................................................................................36
13.4 Draining the installation.....................................................................................................38
13.5 User's instructions.............................................................................................................39
13.6 Maintanance frequency.....................................................................................................39
13.7 Warranty............................................................................................................................39
14 Error indication .............................................................................................................................40
Annex A Technical specications ....................................................................................................41
Annex B Additives ...........................................................................................................................42
Annex C Dimensions .......................................................................................................................43
Annex D Installation examples ........................................................................................................45
D.1 Radiator installation without thermostatic radiator valves .................................................45
D.2 Radiator installation with underoor heating zone ............................................................46
Annex E Resistance table sensors..................................................................................................47
Annex F Declaration of Conformity .................................................................................................48
Annex G Kiwa certicate..................................................................................................................49
Benchmark Checklist............................................................................................................................50
Service Record.....................................................................................................................................51
Work on the installation should only be carried out by qualied personnel with
calibrated equipment and appropriate tools.

Installation & Servicing Instructions ATAG Q-Series
4
1 Introduction
These instructions describe the functioning, installation, use and primary maintenance of
ATAG central heating units for the United Kingdom and Ireland. Where necessary the
different 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 ATAG 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 ATAG
central heating boilers.ATAG is not liable for the consequences of mistakes or shortcomings
which have found their way into the installation instructions or user’s manual. Further,ATAG
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 and card.
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.
On completion of the installation the installer or commissioning engineer must ll out
and complete the Benchmark Commissioning Checklist found on page 45 of this manual
and hand this to the customer for future record keeping. The Benchmark Service Record
must also be completed by the service agent following each service call, and return to
the customer. A copy of the Benchmark Commissioning Checklist must be returned to
ATAG Heating along with the warranty registration card to register the appliance for the
standard warranty benets.
Relevant Installation, Service and User manuals:
- ATAG Cascade Hydraulic cascade system
- ATAG Duopass Flue system individual
- ATAG BrainQ Digital room thermostat
- ATAG MadQ Cascade-/Zone controller
2 Rules
The following regulations apply to installation of ATAG central heating units:
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 Register approved contractors carry a Gas Safe Register ID Card and have
a registration number. You can call Gas Safe Register direct on 01256 372300
In addition to the above regulations this appliance must be installed in compliance with
the current IEE Regulations, the Building Standards (Scotland Consolidation) Regulati-
ons. Regulations and bye laws of the Local Water Authority and the Current Health and
Safety Regulation.
The Benchmark Scheme
Benchmark places responsibilities on both manufacturers and installers. The purpose
is to ensure that customers are provided with the correct equipment for their needs,
that it is installed, commissioned and serviced in accordance with the manufacturer’s
instructions by competent persons and that it meets the requirements of the appropriate
Building Regulations. The Benchmark Checklist can be used to demonstrate compliance
with Building Regulations and should be provided to the customer for future reference.

Installation & Servicing Instructions ATAG Q-Series
5
Installers are required to carry out installation, commissioning and servicing work in ac-
cordance with the Benchmark Code of Practice which is available from the Heating and
Hotwater Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.
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 ATAG Q 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 ATAG Q 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 device may be operated only by authorized persons who have been instruc-
ted on the operation and use of the device. Improper use may cause damage to
the device and / or to the connected installation.
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 instructions.
Children being supervised are not to play with the appliance.
Observe the following rules of safety:
- All work on the unit must take place in a dry environment.
- ATAG units may never be in operation without their housing, except in connection
with maintenance or adjustments (see Chapter 13 and 14).
- 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 programmes
- Close the gas tap
- Remove the plug from the wall socket
- Close the stop cock of the unit’s intake connection
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 detection uid (LDF).
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 insufcient care taken during transport.

Installation & Servicing Instructions ATAG Q-Series
6
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
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); • Concentric ue adapter 80/125 (Q51/60S);
• Safety valve (inside the boiler); • Template on the package wrapper;
• Suspension bracket • Installation instructions;
• Draining valve with T-piece; • Operating manual;
• Fixing material consisting of plugs and • Warranty card;
screws; • Benchmark logbook.
4 Description of the boiler
The ATAG Q boiler is a room sealed, condensing and modulating central heating boiler,
with or without an integrated hot water facility.
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 efciency. The condensate, which has no effect 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: ATAG Q 51C
Q = Type
51 = Nominal load in kW
C = Combi (S = Solo)
The boiler has been tested according to valid CE* standards and has a CE* certicate
and SEDBUK A-rating.
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 & Servicing Instructions ATAG Q-Series
7
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 cylinder DHW (Combi)
10 operating panel
11 Control Tower (CMS)
12 water lter return CH
13 three-way valve
14 circulation pump (A-label)
15 thermostatic mixing valve
16 ue gas discharge
T1 ow sensor
T1a secondary ow sensor (Q60S)
T2 return sensor
T3 cylinder sensor DHW (combi)
P1 water pressure sensor
ATAG Q gure 4.a
4 2 1 3 175 16 7 6 918
CE
13 14 15
W
G
19 10
T1
8
11
T2
T3
P1
KRA
17 combustion air supply
18 air box
19 type plate
G gas pipe
A ow connection central heating
R return connection central heating
C condensation / safety discharge
pipe
E expansion vessel pipe (Q25S,
Q38C and Q51C)
K cold water pipe (combi)
W hot water pipe (combi)
12
T1a

Installation & Servicing Instructions ATAG Q-Series
8
5 Mounting the boiler
Install the boiler in a well-ventilated boiler room in accordance to the actual
local regulations BS5440-2:2000.
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 suf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 & Servicing Instructions ATAG Q-Series
9
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 different 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. The Q51S and Q60S are supplied
with this feature for converting from the standard 2x 80 mm to concentric 80/125 mm.
- Cold and hot water pipes.
Only Combi boilers: These consist of 15 mm copper pipe and can be connected to
the installation by means of compression ttings.
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. This means the temperature difference 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 Q51C, Q51S and Q60S to
prevent ow problems over the boiler.
ATAG supplies the AA1OV09U Low velocity header for 1 boiler. 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
Q25C 20-70 15,8 950 25 250
Q38C 20-70 24,0 1440 20 200
Q51C 20-70
Q25S 20-70 15,8 950 25 250
Q38S 20-70 24,0 1440 20 200
Q51S 20-70
Q60S 20-70
Low velocity header required
Low velocity header required
Solo
Water flow rate
Permissible installation
restistance
Combi
Low velocity header required
Installation resistance table 6.1.a

Installation & Servicing Instructions ATAG Q-Series
10
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
difference between ow and return water has been obtained. If, after this, the temperature
difference remains to much then the boiler will switch itself off and wait until an acceptable
temperature has arisen (DT 20°C).
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 off.
If the capacity of the boiler pump is insuf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, 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.
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 substantial part of the radiators have thermostatic radiator valves or if 2-port
zone valve are installed, an automatic by-pass valve must be used to prevent ow
rate problems. The automatic by-pass valve used should have the same diameter as
the connecting diameter of the supply and return pipe of the boiler. A decrease of pipe
diameter between boiler and by-pass is not allowed. See also Annex C.
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. See chapter 6.5.
When using more than one boiler in an installation please refer to the cascade installation
instructions.
external installation pump
with low velocity header
gure 6.1.a

Installation & Servicing Instructions ATAG Q-Series
11
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.
All Combi boilers are provided with an expansion vessel connection. This pipe is
connected between the three way valve and boiler pump. This prevents the expanding
water, during hot water production, from being closed off from the expansion vessel,
when the thermostatic radiator valves are fully closed. A second expansion vessel in the
installation is not a problem.
The Solo boilers Q25S and Q38S are provided with an expansion vessel connection.
When this boiler is combined with a cylinder, the expansion vessel connection is
included in the internal piping of the cylinder circuit, to which the expansion vessel can
be connected.
In connection with correct functioning of the boiler it is necessary for the
expansion vessel to be connected to the expansion vessel pipe of the boiler.
The Solo boilers Q51S and Q60S 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.
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 & Servicing Instructions ATAG Q-Series
12
6.3 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.
6.4 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 treatment of this water is 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 6.4.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 has not been ushed and/or
the quality of the lling water does not meet the specications recommended
by ATAG Heating UK Ltd. Always contact ATAG Heating UK Ltd 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 6.5.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. ATAG Heating UK Ltd 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
purpose, 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 ATAG Heating
UK Ltd has approved their corresponding use.
- Should you wish to achieve the required water quality by using chemical additives,
then this is your own responsibility. The warranty on the product delivered by
ATAG Heating UK Ltd expires, if the water quality does not meet ATAG Heating's
specications or the chemical additives have not been approved by ATAG Heating
UK Ltd.
- On installation and during additions or changes at a later stage, ATAG Heating UK
Ltd recommends to keep a record of the type of water used, its quality at the time,
and if applicable, which additives and quantities were added.

Installation & Servicing Instructions ATAG Q-Series
13
Parameter Value
Water type Potable water
Softened water
pH 6.0-8.5
Conductivity (at 20°C in µS/cm) Max. 2500
Iron (ppm) Max. 0.2
Hardness (°dH):
Installation volume/capacity
<20 l/kW
1-12
Installation volume/capacity
>=20 l/kW
1-7
Oxygen No oxygen diffusion allowed during
operation.
Max. 5% lling water addition annually
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 6.4.a
Water quality in DHW facility
Parameter Value
Water type Potable water
pH 7.0-9.5
Conductivity (at 20°C in µS/cm) Max. 2500
Chloride (ppm) Max. 150
Iron (ppm) Max. 0.2
Hardness (°dH) 1-12
Number of bacterial colonies at 22°C
(number/ml). pr EN ISO 6222
Max. 100
table 6.4.b
- When the amount of chloride is above the required specications mentioned above
in table 6.4.b, it is necessary to apply an active anode in case of the use of a DHW
cylinder.If this is not met it will void the warranty for DHW parts of the installation.
- When the amount of chloride is above the required specications mentioned above in
table 6.4.b, in case of the use of a combi boiler will void the warranty for DHW parts
of the boiler.
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 & Servicing Instructions ATAG Q-Series
14
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 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).
Make sure that the gas pipe work does not contain dirt, particularly with new
pipes.
When the boiler has to be converted from natural gas to LPG, ATAG provides special
kits for this purpose. Special instructions are supplied with the kit.
Always check the installation of all of the parts through which gas ows using
leak detection uid (LDF).
6.6 Hot water supply
Connection of the drinking water installation should be done according to the national
water laws.
The sanitary water pipes can be connected to the installation by means of compression
ttings. The cold water inlet on the Combi boilers must be provided with the following
(counted in the water ow direction):
Flow restrictor (supplied), Safety group, Expansion vessel 6bar (potable water, blue).
A ow restrictor must be tted in the cold water pipe. The ow restrictor ensures that
a quantity of water is supplied which has a guaranteed outlet temperature of 60°C
(assuming a cold water temperature of 10°C). The quantity of water is virtually unaffected
by the water pressure.
With a water pressure lower than 1.5 bar it is advisable to remove the inside mechanism
of the ow restrictor.

Installation & Servicing Instructions ATAG Q-Series
15
6.7 Condensation drain pipe
ATAG Condensing boilers have the top SEDBUK band A Classication for high energy
efciency in heating and domestic hot water.
All ATAG wall hung gas red condensing boilers contain a syphonic condensate trap to
collect and realease condensate.
The amount of condensate formed is determind by the type of boilers and the water
temperature produced by the boiler.
Condensate pipework.
Use plastic pipework of a diameter no less than 25mm.
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
harmfull ue products evacuating via the condensate route.
Do not dispose condensate into a water recovery system where it is recaimed for reuse.
Condensate can be discharged into a rainwater hopper which is part of a sewer carrying
both rain water and foul water.

Installation & Servicing Instructions ATAG Q-Series
16
Final discharge options.
The condensate pipe can only terminate into any one of the ve areas as shown in the
diagrams 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 300 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 -Servicable 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 6.7.a
K

Installation & Servicing Instructions ATAG Q-Series
17
6.8 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:
IGE/UP/10; Installation of ued gas appliances in industrial and commercial
premises
BS EN 1856-1; Chimneys - Requirements for metal chimneys -
Part 1: System chimney products
BS EN 1856-2; Chimneys - Requirements for metal chimneys -
Part 2: Metal liners and connecting ue pipes
BS EN 15287-1; Chimneys - Design, installation and commissioning of chimneys -
Part 1: Chimneys for non-room sealed appliances
BS EN 15287-2; Chimneys - Design, installation and commissioning of chimneys -
Part 1: Chimneys for room sealed appliances
BS EN 13384-2; Chimney - Thermal and uid dynamic calculation methods -
Part 2: Chimneys serving more than one heating appliance
Clean Air Act; For multiple boiler application where total heat input exceeds
366.4 kW [ or 150 kW as advised within the CAAM, refer to local
authority ]
Ireland:
- Irish standard is 813 section 9.10.1
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 ATAG HEATING.

Installation & Servicing Instructions ATAG Q-Series
18
The boiler can be tted with a parallel connected ue gas outlet and air supply system
or a concentric ue gas outlet and air supply system.
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 next page descibes the
conversion from concentric to parallal.
The Q51S and Q60S boiler has a connection of 2x 80mm from factory. The boiler is
supplied with a ue adapter 80/25 mm to convert the boiler from parallel to a concentric
connection.
The maximum permissible pipe length is set out in Table 6.8.1.a.
Open boiler
Room sealed system
SS
P
SS
P
P
SS
P
Open ued en room sealed system gure 6.8.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

Installation & Servicing Instructions ATAG Q-Series
19
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. S4440520.
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).
Q51S and Q60S Boiler conversion from parallel to concentric
It is possible to convert the Q51S and Q60S boiler from the standard 2x 80 mm parallel
to a concentric ue connection ø80/125mm. In this case use the concentric ue adapter
ø80/125 mm supplied with the boiler.
Conversion of the boiler should be done following the description above in reverse order.
A
1
B
2
3
C
4
7
5
6
8
D
boiler conversion from
concentric to parallel
gure 6.8.a

Installation & Servicing Instructions ATAG Q-Series
20
We suggest you design a simple ue gas system and air supply system using table 6.
For further information about the available components of the ue gas and air supply
system we recommend you consult the Duopass Flue system literature.
The ATAG ue gas system is meant, and designed, solely for the use on ATAG central
heating boilers adjusted to Nat gas or LPG. The maximum ue gas temperatures are
below 70°C (full load 80/60°C)
The proper operation may be adversely inuenced 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 systems described in this document are solely suited for ATAG central
heating boilers of the ATAG boiler range. For this purpose the CE Certicate has been
supplemented under the Gastec nr: 0063BR3405, 0063BQ3021, 0063AS3538 and
0063AU3110. 0063BQ3021, 0063BT3195 en 0063CM3648
The ue gas system should be built up using only ATAG program products. Combinations
with other brands or systems, without written permission from ATAG Heating, are 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 6.8.b).
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 6.8.a
gure 6.8.b