Euroheat EVO Aqua Release note

Installation &
Servicing Instructions
EVO Aqua
EVO Aqua 9kW. EVO Aqua 15kW.
IN1231 Edition A Date July 2011
PART NUMBER
SERIAL NUMBER
This manual must be used in conjunction with document IN1173.
The Wood and Mutlifuel Chimney and Installation Guide.

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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Table of Contents
Model Identification .......................................................................................................................4
Dimensions .....................................................................................................................................5
Evo Components.............................................................................................................................6
Sectional Drawing Through Evo Aqvo and Rear View of Evo Aqua..............................................6
Important Information Prior to Installation and Commissioning .................................................7
Specialist Installation and Commissioning....................................................................................7
1 System Requirements .................................................................................................................8
1.1 Calculation of Heat Requirements...........................................................................................8
1.2 Application Possibilities ...........................................................................................................8
1.3 Water System, Output Consumption .......................................................................................9
2. Combustion Air Supply ..............................................................................................................9
3 Sighting of the Stove................................................................................................................ 10
3.1 Minimum Distances from Flammable Materials ................................................................. 10
3.2 Requirement for the Baseplate of a Tiled Hearth ............................................................... 11
3.3 Connections Positioned at Rear of Boiler............................................................................. 11
3.4 Connections for Under Floor Routing ................................................................................... 12
3.5 Noise Reduction ................................................................................................................... 12
3.6 Room and Ambient Temperatures/Humidity...................................................................... 12
3.7 Flue Connection..................................................................................................................... 12
4 Pellet Quality............................................................................................................................ 13
5 Boiler Return Flow Temperature.............................................................................................. 13
5.1 Buffer Cylinder....................................................................................................................... 13
6 Cleaning, Maintenance and Servicing..................................................................................... 13
7 Component Assembly .............................................................................................................. 14
7.1 Positioning the Boiler in the Living Room/Installation Room............................................ 14
7.3 Access to Hydraulic Connections........................................................................................... 15
8 Electrical Connection/Equipment Interfaces.......................................................................... 16
8.1 Power Supply/Main Fuse ..................................................................................................... 16
8.2 Pin Assignment in Main Control Unit ................................................................................... 16
8.3 Pump Connection.................................................................................................................. 17
8.4 Sensor Connection (buffer management)........................................................................... 17
8.5 Connection to the Heating Control System.......................................................................... 18
9 Flue Connection........................................................................................................................ 18
10 Hydraulic Connection ............................................................................................................. 19
10.1 Return Flow Temperature................................................................................................... 19
10.a Use of the Internal Return Flow Boost Assembly.............................................................. 19
10.b Use of an External Return Flow Boost Assembly .............................................................. 19
10.2 Hydraulic Diagrams............................................................................................................. 20
11 Initial Commissioning............................................................................................................. 21
12 Commissioning and Start Up ................................................................................................. 22
Menu Tree “Specialist”..........................................................................................................24/25
Menu Tree “Basic”....................................................................................................................... 26
Boiler/Pellet Conveyor System Check..................................................................................26/27

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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IMPORTANT
The installation of this appliance must comply with all local regulations, including those referring to National
and European Standards before it can be operated. The stove is not suitable for a shared flue. For England and
Wales, only, the coming into force on 1st April 2002 of SI 2002 No 440 exempts the householder from this legal
requirement for the installation of solid fuel fired appliance whose rated heat output is 50kW or less in a building
having no more than 3 storeys (excluding any basement) if a Competent Engineer is employed who is registered
under the Registration Scheme for Companies and Engineers involved in the Installation and Maintenance of
Domestic Solid Fuel Fired Equipment operated by HETAS Ltd. These registered Competent Engineers may also carry
out associated building work necessary to ensure that the installed appliance complies with Building Regulations
without involving the Local Authority Building Control Department.
 This appliance MUST be installed with a thermal store/buffer/accumulator. This is specialised work and should
only be undertaken by a suitably qualified heating engineer.
 Improper adjustment, alteration, maintenance or the fitting of replacement parts not recommended by the
manufacturer can cause injury or property damage. Do not operate the stove with faulty seals or damaged glass.
 Due to the high operating temperatures of this appliance it should be located away from pedestrian traffic and
away from furniture and draperies. Do not store flammable materials near the appliance. Any mats and rugs put in
front of the appliance should be fire proof and secured to prevent the possibility of tripping.
Advise all persons as to the stove’s high surface temperatures. If it is possible for children or infirm adults to
come into contact with the appliance, fit a suitable fire guard.
 It is imperative that all air passageways into, out of, and within the appliance are kept clean. All permanent
ventilation into the room provided for the stove must remain clear and unobstructed at all times. Consideration must
be given to the need for extra ventilation if another heating source needing air is to be operated simultaneously.
If an extraction fan is proposed to be fitted to a connecting area of the house, after the stove has been installed,
professional advice must be sought from a qualified engineer.
The user should be advised that the appliance should be inspected regularly and the chimney cleaned at
least annually. More frequent cleaning may be required and the advice of a qualified chimney sweep should be
sought.
 Our range of stoves is capable of operating with outstanding efficiency if the flue system is correct. Because so
little heat is wasted to the flue it is possible that moisture within the products of combustion will condense if the
heat losses within the flue way are too great and allow the flue gases to cool. For this reason we recommend that
the stove is fitted with a suitable flue liner, to prevent the possibility of acidic damage to the fabric of the chimney
and damage to the stove which will reduce the longevity of the stove.
 When correctly installed, the stove is designed to produce heat, safely. It cannot do so if the installation is less
than absolutely stable, constructed of materials suitable for such an installation and consideration has not been
given to the possibility of people with less than ideal common sense operating it.
Have the existing chimney swept by a chimney sweep. Although you will be lining the chimney, any deposits
left in the chimney will cause problems and may become a fire hazard.
 Your attention is drawn to the precautions and responsibilities under the Health and Safety at Work Acts, and
whatever new legislation being introduced during the life of this document.
 This appliance must only be operated by a competent person who has read and understands the operating
instructions supplied with this appliance.

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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The Model Range Explained
RIKA (SHT) and Euroheat insist on progressive development with all our products. Our aim is to produce stoves
with the latest innovations, to be user friendly and achieving the highest efficiency possible to give the lowest
heating costs and environmentally cleanest operation possible.
This manual offers installation information for the RIKA (SHT) Evo Aqua wood pellet stove.
Model Identification
The front page of this document has a label attached which confirms which model you have; this label also
advises you of the stoves unique serial number and is also attached to the stove and registration document.
The name plate can be found on the appliance beneath the front cover.
Important Ensure you retain all supplied documentation. In the event of a claim under the warranty or for
the subsequent delivery of spare parts, we will always require the serial number of the appliance. We cannot
accept any warranty claim without this information.
Please ensure the warranty registration form is completed if you are the installer and confirm with the user
that it is their responsibility to return it to Euroheat. In this way the model and its history will be recorded for
reference in the future.
For the latest versions of manuals, technical information, accessories and spare parts, visit the Euroheat web
site.
Stoves supplied through Euroheat authorized retailers.
For England, Wales, Scotland and Northern Ireland
Euroheat Distributors (H.B.S). Ltd.
Unit 2, Court Farm Business Park,
Bishops Frome,
Worcestershire. WR6 5AY.
www.euroheat.co.uk
[e-mail]
Whilst Euroheat’s technical department is always happy to assist with any technical advice, please ensure you
have read this manual and the chimney and installation guide IN1173.
First contact your supplying retailer for assistance. If you find this unsuccessful contact the Euroheat Technical
support team. Technical support telephone Number 01885 491117. E-mail [e-mail].
Before telephoning ensure you have the stoves serial number to hand and that you are a registered competent
engineer. If you are not a registered engineer seek one for assistance. A list of engineers can be obtained from
HETAS.
Euroheat are NOT able to offer support for appliances which were not supplied by Euroheat.
SHT Heiztechnik aus Salzburg GmbH
Rechtes Salzachufer 40
A-5101 Salzburg-Bergheim
Austria
+0043 662 450 444
www.sht.at

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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1138mm
584mm 685mm
flue
188mm
Technical Data:
* The type-tested output range is taken from the original test certificates and may deviate slightly from the specified values.
Model / Type
Output range* Fuel capacity Boiler water content Water, resistance at Δ10K Boiler / air flow rate
Boiler dimensions
Boiler weight Flue tube diameter (external) Minimum draught required Flow and return Emptying
Height
Height of flue
tube
Width
Depth
KW kg l mbar % mm kg mm Pa inches
EVO AQUA 9 2.7-
10 35 20 13.2 87:13 1138 188 584 685 265 100 5 ¾ ½
EVO AQUA 15 4.5-
14.9 35 20 33.1 90:10 1138 188 584 685 265 100 5 ¾ ½
Emissions:
Type Output range
Efficiency
Dust Carbon monoxide CO Organic carbon OGC Nitrogen oxides NOx
referred to
the rel.
energy
referred to
the O2
content of
referred to
the rel.
energy
referred to
the O2
content of
referred to
the rel.
energy
referred to
the O2
content of
referred to
the rel.
energy
referred to
the O2
content of
13% 13% 13% 13%
%mg/MJ mg/m³ mg/MJ mg/m³ mg/MJ mg/m³ mg/MJ mg/m³
EVO 9
NL 92.8 11 17 29 46 <2 266 105
TL 94.6 10 16 96 152 3 4 58 92
EVO 15
NL 94 813 26 40 2 3 74 113
TL 95.4 17 26 82 126 <2 <2 64 99
Test Type:
The EVO AQUA has been tested by the Technische Universität Wien (Technical University of Vienna) according
to EN 14785. The stove complies with the emission requirements according to Art. 15a B-VG concerning safety
precautions and efficiency. The original test certificates are held by the manufacturer.
Mains Voltage / Power Supply
The appliance is designed to operate with an electrical supply of 230 VAC/50 Hz. Voltage fluctuations from
-15% to +10% are acceptable.
Dimensions
Thermal discharge

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9
8
7
6
5
4
3
2
1
2
15
14
13
12
11
10
7
6
5
4
12
3
8910
11
15
14
13
12
Evo Components
Sectional Drawing Through Evo Aqvo Rear View of Evo Aqua
1 Pellet hopper lid
2 Front cover flame
3 Temperature sensor
4 Firebox door
5 Ash pan door
6 Refactory brick
7 Comb grate
8 Ash pan
9 Base plate
10 Comb grate motor
11 External air connection
12 Ignition element
13 Screw conveyor motor
14 Rotary valve
15 Screw conveyer
16 Pellet hopper
1 Pellet hopper lid
2 Top cover plate
3 Control panel
4 Fuse
5 STB safety cut out
6 Data connection socket
7 Flue outlet from stove
8 Flow connection with safety valve
9 Return connection
10 Access to fit cables
11 Connection for combustion air
12 Cover for screw conveyor motor
13 Rear panel
14 Vacuum filling cover (optional)
15 Side panel

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Important Information Prior to Installation and Commissioning
Carefully read through this information prior to installation and commissioning of the
stove.
SPECIALIST INSTALLATION AND COMMISSIONING:
Correct operation of the boiler/installation can only be achieved if installation is carried out by a trained
specialist (licensed installer or qualified heating engineer) according to all the relevant standards and legal
requirements. Initial commissioning can be carried out as required by a suitably trained and qualified heating
engineer. Prior to initial commissioning of the boiler by a specialist, the operator of the system must ensure
the system is ready for operation (i.e. electrical cabling, hydraulic connections, unobstructed and suitable flue,
suitable heat dissipation and appropriate fuel).
CORRECT OPERATION:
Please note that all heating equipment is potentially dangerous and that no heating equipment is childproof. It
must therefore not be operated by children or other unauthorised and untrained personnel. Training is given by
your specialist installer, authorised customer services or SHT customer services technician, when commissioning
or during servicing. In the event of unprofessional installation, commissioning, or incorrect operation involving
non-observance of the device-specific instructions, as given in the technical documentation accompanying this
product all warranties are void and no guarantee claims will be accepted. A system for ensuring the boiler
return flow temperature is maintained above 55°C and the use of a buffer cylinder are essential for correct
operation, as is hydraulic balancing of the system. The system heated by the boiler must allow the device to
run for a minimum time of 1.5 – 2 hours per combustion cycle with the boiler at a minimum of 50% of its rated
output.
FUEL AND SET-UP:
The stove must be operated by a competent operator using only the appropriate fuel, as specified in these
instructions, and in suitable, dry boiler rooms/installation locations. The fuel store must also be dry and meet
the fuel-specific requirements. The boiler room/installation room and fuel store must comply with the relevant
construction and safety regulations. The storage room must only be entered after prior ventilation and when
the stove has been switched off and disconnected from the power supply.
FLUE REQUIREMENTS FOR STOVES:
The stove requires a flue system that has been installed by a HETAS approved installer. Adequate provision must
be made for cleaning access.
PERIODIC CLEANING AND SERVICING OF THE INSTALLATION:
Each heating installation of this stove, including all associated system components must be serviced and
cleaned periodically to ensure correct functioning and efficient operation. Observe the cleaning and servicing
requirements in these instructions. Only a clean and correctly adjusted boiler is an efficient boiler. A coating of
only 1 mm of dust on the heat exchanger surfaces increases fuel consumption by approximately 7%.
THE CORRECT ASSEMBLY SEQUENCE:
Observe the correct assembly sequence given in these instructions. The insulating jacket, sheet-metal cladding
including insulation, must be fitted before the water is connected. Before commissioning fill the stove with the
heat transfer medium in accordance with the relevant standards and ensure a suitable operating pressure is
generated in the manifold lines.
OBSERVE ALL REGULATIONS AND SAFETY INSTRUCTIONS:
Ensure that you comply with all the requirements of the relevant laws, standards, building regulations and all
related safety requirements for heating systems, boiler rooms and fuel storage rooms. Further information can
be obtained from your competent installation company and building authority.

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1 System Requirements
The products of SHT Heiztechnik aus Salzburg GmbH are designed to work in combination with other components
of a heating system and to provide trouble free performance. The entire system should be designed to ensure
all components are compatible with each other and for the fulfilment of your heating requirements. For this
reason we recommend the system is designed by a qualified heating engineer who will be able to calculate
your heating load and be able to estimate reliably your expected fuel consumption.
Experience shows that a heating system is operated at rated load for a total of approximately 1500 hours
during a heating season. This is the total rated load and partial load hours added together. In this instance an
EVO 9 operating at 10kW for 1500 hrs. will produce 15000 kWh per year and burning pellets with a calorific
value of 4.8kWh/kg the annual consumption of pellets will be 15000 divided by 4.8 giving 3125kg.
1.1 Calculation of Heat Requirements
Choosing the right size of boiler to suit the specified heat requirements and the operating conditions is paramount
to ensuring satisfactory operation of the stove. For the stove to operate efficiently the boiler needs to be able
to produce heat at a minimum of 50% of its rated output for an operating time of between 1.5 to 2 hours or
higher at each burning cycle to ensure all tars and soot that may have been developed when the stove was
reaching its full operating temperature have been burned off.
The stove will need to dissipate aproximately 10% to 15% of its output to room and the remaining 85% to 90%
to be sent to the hydralic circuits. The heat generated in the boiler must be able to be discharged to the outside.
This is achieved to a lesser extent (approximately 10 to 15%) via the glass in the door and the outer shell of the
boiler. Most of the heat (85% to 90%) is transferred to the hot water circuit which is connected to the heating
system. Make sure that the system as a whole is also able to dissipate the amount of heat produced.
The heat requirements can only be calculated by taking the entire system into account. The system designer
is usually responsible for this task. Note that the boiler, connected to a buffer cylinder, must have a minimum
operating time of 1.5 to 2 hours running at least 50% of its rated output. This ensures the burner has time to
clear any tars and soot that may have been produced when the combustion chamber was below its normal
operating temperature and so maintain optimum efficiency.
1.2 Application Possibilities
As a main heating system: Operating as a central heating appliance in a low-energy requirement home.
As an additional heating system: Operating as an addition to other heat sources.
This distinction is important when designing the system especially when selecting components such as a buffer
cylinder or contemplating an additional thermal solar heating system.
Note: Domestic Water Heating in Summer Operation
The EVO AQUA is designed to give the majority of its heat output to its boiler and a minimum heating output
to the room of installation. At 9 kW the ratio is approximately 87% to boiler and 13% to room and at 15kW it
is 90% to boiler and 10% to room. However, as the output to room cannot be avoided entirely if it is to supply
domestic water heating during the summer months, undesirable room heating may occur. If this heating is
not required, we would recommend the addition of an alternative domestic water heating system such as an
electric immersion heater or a thermal solar heating system. Your heating engineer will be able to give you
suitable options.

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It should be remembered that if additional heating sources, such as solar thermal systems, are incorporated
into your heating system, it may be possible to provide domestic hot water and space heating without the EVO
AQUA running during periods of mild weather. For this reason we always recommend a radiator is fitted in the
room in which the stove is installed.
1.3 Water System, Output Consumption
Heating requirements and hot water storage facilities must provide for the appliance to operate for 1.5 to 2
hours for at least 50% of its rated output per combustion cycle. The minimum accumulator sizing, assuming the
input of no other heating devices is as follows:
Evo Aqua 9kW 400 litres
Evo Aqua 15kW 500 litres
2. Combustion Air Supply
Due to advances in energy-saving technology for residential buildings, building shells are becoming increasingly
sealed off from the atmosphere. If combustion air for a stove is taken from inside this shell a suitably sized
permanent air vent must be provided. Operating open flue stoves in combination with other extraction
ventilation systems is only permitted under specific conditions. Rika/SHT pellet boilers need approximately 25
and 30 m³/h and any other system drawing air from the house shell such as kitchen extraction fans should be
taken into account; this is must be born in mind if such systems are installed at, or after, the original ventilation
requirements were calculated.
a) An adequate supply of combustion air is essential and if the stove is sourcing this air from the room in which
it is installed adequate ventilation must be provided. Please see the relevant technical information given in our
assembly instructions when other ventilation systems, such as extractor hoods, may affect the air availability.
b) It is possible to fit an external combustion air supply to EVO AQUA when installing it or at a later date if
additional appliances that may affect the stove’s air supply are fitted. This will allow all combustion air to be
drawn from outside the dwelling.
Fresh Air Kit: RKA1026
If using a fresh air kit where a draught
stabiliser has been fitted to the
starter pipe, free air must be supplied
in accordance with current Building
Regulations.

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EVO installed in a living room
Distance A:
At least 80 cm in the radiation zone must be considered as an area where people and objects are not allowed
when the stove is operating.
Distance B:
A minimum distance of 40 cm should be maintained from movable objects such as chairs or tables.
Distance C:
At least 10 cm between the flue tube and the wall if it is not inserted directly in the rear wall.
Distance D:
At least 50 cm from immovable objects on the right and left sides to allow for servicing and maintenance.
Distance E:
Minimum distance between boiler and rear wall in the installation room providing that distance C is observed,
or the flue tube is inserted directly in the rear wall.
E = 20 cm distance from rear wall if the boiler is installed without automatic conveying system.
E = 20 cm distance if installed with the automatic conveying system, visionconvey AIR, if the hoses are passed
straight down into the floor or are routed to the side in the same room.
E = 35 cm distance if installed with the automatic conveying system, visionconvey AIR, if the hoses are routed
in the rear wall behind the boiler.
3 Sighting of the Stove
3.1 Minimum Distances from Flammable Materials
These distances are our recommended minimum distances but the fire safety requirements of applicable
standards must be observed when constructing the system as a whole.
All flammable materials in the immediate vicinity of the boiler must be protected from the effects of heat.
C
D
A
B
E

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3.2 Requirement for the Baseplate of a Tiled Hearth
Installation surfaces made from flammable materials such as parquet floors, PVC floors, etc. must always be
protected by mounting the stove on a fireproof plinth which extends beyond the boiler at the sides and front.
The plinth must be designed to be load bearing and fireproof.
The following minimum dimensions should be observed when positioning the stove on the plinth or tiled
floor:
At least 30 cm on each side of the plinth and at least 50 cm from the front of the plinth. The reference points
are not the outer edge of the boiler, but the firebox opening (see drawing).
3.3 Connections Positioned at Rear of Boiler
Please see page 6 for the markings for the individual connections. This includes the exact dimensions for the
connections on the rear side.
The overall width of the boiler is 584 mm.
50cm
30cm

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3.4 Connections for Under Floor Routing
If you intend to provide connections outside the boiler and through the floor, it is advisable to position them
as shown in the diagram.
3.5 Noise Reduction
The perceived noise level of any heating appliance is always a subjective matter but it can be irritating. When
installing the EVO AQUA, we recommend that rubber buffers be fitted on the four adjustable feet, especially
on tiled floors to prevent vibrations from the motors in the appliance being transmitted to the underlying
surface.
To ensure optimum acoustic insulation we recommend that all pipes to the appliance be fitted with flexible
connections so that vibrations are not transmitted to the entire piping system.
3.6 Room and Ambient Temperatures/Humidity
The appliance is designed to operate in living rooms with normal humidity and ambient temperatures of +5°C
to +40°C.
If there is a possibility of the room temperatures falling below 5°C, suitable frost protection must be provided
in the water circuit.
The appliance is not waterproof and must not be installed in a room where water may be splashed upon it.
3.7 Flue Connection
It is imperative that the appliance is connected to a moisture-resistant flue suitable for solid fuels. The flue
draught must always be between a minimum of 5 and a maximum of 15 Pa. Prior to installation, calculation
and dimensioning of the flue must be carried out by the qualified heating engineer installing the appliance. The
flue ensures the safe extraction of the flue gases from the appliance in the event of power failure and therefore
fulfils an important safety function.
Flue outlet
External air supply
Suction conveying system
Boiler flow/return
590mm
20mm 70mm
550mm
105mm
150mm
150mm

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4 Pellet Quality
Wood pellets are 100% wood residues in their natural state (wood shavings, sawdust, etc.). Dry wood residues
are fragmented and compacted to form wood pellets. The pellets used in the Evo Aqua must conform to ENplus.
A quality assurance system ensures the pellets comply with the requirements of the new standard and that the
conditions for trouble-free heating are guaranteed.
In practice: 2 kilograms of wood pellets equate to approximately one litre of light fuel oil. Wood pellets must be
transported and stored completely dry. If they come into contact with moisture, pellets swell up considerably as
wood is hygroscopic. A simple test for the quality of pellets is to look at them and in good quality pellets you
should see their longitudinal surfaces look smooth with a slight glaze, that they are of reasonably consistent
length and that there is no dust. Poor quality pellets will not exhibit the previous qualities and will often be
darker, of variable length and have longitudinal cracks. The density and compaction quality of the pellets can
be quickly estimated by putting a small handful into a jug of water where well compacted pellets will sink and
poorly compacted pellets will float because of their differing densities.
5 Boiler Return Flow Temperature.
The boiler return flow temperature must never fall below 55°C when measured at the appliance return flow
connection if soot and tar formation, with resulting boiler corrosion, are to be avoided. To ensure this a suitable
load valve must be fitted between the boiler output and return tappings. Euroheat offer special water control
assemblies, to ensure a consistent return flow minimum of 60°C, which can be positioned inside or outside the
boiler. Details can be found in the separate assembly and installation instructions.
5.1 Buffer Cylinder
A buffer cylinder is essential for efficient operation of this appliance. By using a buffer cylinder, the boiler can
always be operated in the optimum output range, thus minimising consumption and pollutant emissions. This
also extends the service life of the system and wearing parts.
6 Cleaning, Maintenance and Servicing
This appliance is a wood-fired boiler. Ash and soot accumulate when solid fuel is burnt, which means that
periodic cleaning and servicing is necessary. If this is not carried out, faults can arise for which we cannot accept
any liability. Only a clean and correctly adjusted boiler is an efficient boiler. A coating of only 1 mm of dust on
the heat exchanger surfaces increases fuel consumption by approximately 7%.

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7 Component Assembly
The EVO AQUA boiler is delivered ready-assembled on a wooden pallet.
7.1 Positioning the Boiler in the Living Room/Installation Room
The EVO AQUA is installed in the living room as described in Section 5.
Before starting to install the boiler, the hydraulic connection (Section 10), the electrical connection (Section 8)
and the flue connection (Section 9) of the system must be established.
Models: EVO ALU, EVO Terracotta, EVO Vanilla and EVO Plum
7.2 Removing the side cladding
Open the two top covers and pull the front cover upwards.
Remove the two side covers as shown in the pictures on page
15.
Remove the wing nuts, draw back the slider and lift off the
cover.
1
2
3

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Remove the two socket screws for the side cladding and lift them off the fixing.
The two rear columns swivel out to permit access to other components.
To do this, remove the two socket screws.
7.3 Access to Hydraulic Connections
After removing the right side wall and swivelling out the right rear column,
the hydraulic connections can be accessed easily. The picture shows the
integral return flow temperature governor assembly; this is not supplied
unless specified when ordering the boiler.

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8 Electrical Connection/Equipment Interfaces
The EVO AQUA boiler is delivered ready-wired. Check that none of the cables have become detached. The
control circuit board is located under the left side cladding of the boiler, when viewed from the front.
Note the instructions in the lower half of this page!
8.1 Power Supply/Main Fuse
The device is designed exclusively for operation with 230 V AC / 50 Hz. It is connected by a 3-pole mains cable
with a shockproof plug. A protective earth device is essential.
A 5 x 20 2.5 A T glass fuse is provided as the integral main fuse. The fuse is located on the left rear side of the
boiler.
Important Information:
The electrical supply must be isolated before carrying out any work on the appliance. The electrical supply must
be isolated when connecting an automatic pellet conveying system.
Electrical connections on the appliance must be performed by a qualified engineer and in accordance with the
applicable regulations. We accept no liability in the event of any damage caused by incorrect connections and
the warranty will be void.
No electrical connecting cables from and to the appliance must come into contact with hot external surfaces of
the stove or flue tube. The cables must not be laid over sharp edges.
8.2 Pin Assignment in Main Control Unit
Notes:
The external control terminals have a cable bridge which allows the boiler to heat up when ever energised.
An external controller such as a room thermostat or timer can be connected at this point after removing the
bridging wire. No voltage must be applied.
Never connect the boiler mains input via any external controller such as a time clock, as this will prevent the
boiler shutdown sequence.
Never remove the electrical supply in order to stop the burner. The burner can only be shut down correctly by
opening the external control terminal loop or by switching off manually.
1
2
3
4
5
678
18 17 16 15 14 13 12 11 10
9
2
3
1
4
4
2
3
5
6
7
8
9
10
11
12
1
1
2
3
Atmal
J2
J1
J3
J12
J8
J11
J10
J9
J6
J4
External control terminals- 24 V, 6 mA. The
connection terminals for potential-free
external control devices.

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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8.3 Pump Connection
The boiler pump for return flow temperature control must always be connected to the boiler as a delay time
is necessary for safety reasons. The corresponding connection cables run from the circuit board connector and
have a 3-pole termination.
The terminated pump cable is connected to the rear connection behind the right
hand side cladding.
8.4 Sensor Connection (buffer management)
A buffer cylinder is essential for the correct operation of this appliance. By using a buffer cylinder, the boiler
can always be operated in the optimum output range, thus minimising consumption and pollutant emissions.
This also extends the service life of the system.
It is essential that the upper sensor is positioned correctly in the flow line from the heating circuit connection
to ensure that the switching temperatures are correct. The lower sensor should be located in the boiler return
flow line and the distance from the upper sensor should be selected such that the necessary volume exists
between the sensors.
As soon as the buffer sensors are connected, the control system recognises that there is a buffer and adjusts
automatically. When mains voltage is switched on, “Buffer active” will be displayed briefly in the display. Buffer
management can be activated or deactivated in the Setup -> Temperatures -> Buffer menu item.
When buffer management is activated, the boiler switches on as soon as the upper buffer sensor falls below
the “TOP BUFFER ON” value and an external controller is calling for heat.
The boiler switches off if the lower buffer sensor exceeds the “LOWER BUFFER OFF” value. If an external
requirement no longer applies during buffer charging, the buffer is still charged until ready.
The charging pump operates as long as the boiler is warm and the boiler is warmer than the buffer.
Both buffer sensors are connected to the external cable; the connection is behind the left hand side cladding
of the appliance.
Buffer Upper
Buffer lower
Lower
Upper
Gnd

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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8.5 Connection to the heating control system
A heating control system should be connected which can operate at least one heating circuit pump and the
voltage free burner requirement.
We are happy to provide suitable circuit diagrams and diagrams of other system solutions.
9 Flue Connection
The flue tube on the stove must be connected to the flue in accordance with the current Building Regulations.
Please contact your SHT dealer or your heating engineer for information on this subject. All flue pipes must be
designed to conform to current British Standards.
The EVO AQUA is able to operate with a flue draught between 5-15 Pa as the suction draught fan conducts the
exhaust gases safely into the flue. If the flue draught is higher than 15 Pa, we recommend fitting a draught
regulator in the flue. This must not draw air from the installation room.
In order to guarantee optimum combustion, the number of bends in the flue pipe must be minimised, no more
than four bends, and laid such that they rise towards the terminal. No reduction in the flue pipe cross-section
is allowed.
Standpipe: RKA1015
The standpipe, or starter pipe, is specifically designed to allow cleaning access and the attachement of a
flue draught stabiliser if required. The horizontal length can be reduced in size according to the individual
installation requirements.
Fuel
Boiler type
Exhaust gas flow rate
in g/sec
Mean exhaust gas temperature
in °C
Minimum
draught
requirement in
[Pa]
NL
TL
NL
TL
Pellets E
EV VO O A AQ QU UA A 9 9
EEVVOO AAQQUUAA 1155
6.7
9.3
3.8
5.7
137
137.4
66.9
60.3
5
5
Outlet Diameter
100mm
Standpipe Diameter
125mm
144
855
The flue position shown above is
for diagrammatical purposes, it is
not a flue option.
584mm
141.5mm
220mm 364mm

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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10 Hydraulic Connection
10.1Return Flow Temperature.
A return flow temperature control device must be fitted to this boiler. This may be fitted internally, if the
optional item No. SHT4002 is fitted or externally if a different device is fitted.
The ideal value for the return temperature at the boiler inlet is 60°C. The return temperature must be greater
than 55°C, or soot and tar may build up on the heat exchanger surfaces and cause corrosion.
The return flow temperature control device is fitted in the return line as close to the boiler as possible to ensure
the temperature at which the device is operating at corresponds exactly to the boiler return temperature.
Boiler circuit pump should be set to a minimum flow of 600 l/h.
Before commissioning, the hydraulic system should be filled with water vented of air and set to a system-
specific operating pressure between 1 bar to a maximum of 2 bar.
a. Use of the Internal Return Flow Boost Assembly
If the return flow boost assembly developed for the EVO AQUA, item No. SHT4002 is fitted to the boiler, it will
be located inside the boiler casing and arranged as illustrated. Full installation instructions are supplied with
the unit.
b. Use of an External Return Flow Boost Assembly
Return Connection
Flow Connection
Return Flow Boost Pump
Return Connection
Flow Connection

© EUROHEAT DISTRIBUTORS (H.B.S) LTD. July 2011 Instructions Part Number IN1231 Ed 1
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10.2 Hydraulic Diagrams
2
13
4
0
bar
2
13
4
0
bar
4
3
5
ESBE
20
60
40 8 0
100
C
o
120
0
ESBE
20
60
40 8 0
100
C
o
120
0
ESBE
20
60
40 8 0
100
C
o
120
0
ESBE
4
3
5