Euroheat EVO Aqua Installation & Servicing Instructions Manual

Brand: Euroheat

Model: EVO Aqua

Category: Stoves

Type: Installation & Servicing Instructions Manual

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.

Instructions Part Number IN1231 Ed 1

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

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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

info@euroheat.co.uk

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 tech@euroheat.co.uk.

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

Instructions Part Number IN1231 Ed 1

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-

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 2 66 105

TL 94.6 10 16 96 152 3 4 58 92

EVO 15

NL 94 8 13 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

Instructions Part Number IN1231 Ed 1

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

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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

Instructions Part Number IN1231 Ed 1

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

Instructions Part Number IN1231 Ed 1

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%.

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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.

Instructions Part Number IN1231 Ed 1

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.

678

16 15

12 11

Atmal

J12

J11

J10

External control terminals- 24 V, 6 mA. The

connection terminals for potential-free

external control devices.

Instructions Part Number IN1231 Ed 1

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

Instructions Part Number IN1231 Ed 1

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]

Pellets

EEVVOO AAQQUU AA 11 55

6.7

9.3

3.8

5.7

137

137.4

66.9

60.3

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

Instructions Part Number IN1231 Ed 1

10 Hydraulic Connection

10.1 Return 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

Instructions Part Number IN1231 Ed 1

10.2 Hydraulic Diagrams

bar

ESBE

100

120

ESBE

100

120

ESBE

100

120

ESBE

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Euroheat EVO Aqua Installation & Servicing Instructions Manual

Brand: Euroheat

Model: EVO Aqua

Category: Stoves

Type: Installation & Servicing Instructions Manual

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Euroheat EVO Aqua Installation & Servicing Instructions Manual

Euroheat EVO Aqua Installation & Servicing Instructions Manual

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