eta PelletsUnit Operation Manual

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2015-10-07 EN

0000000062 V.010 X.33.0

1507 93005

PelletsUnit

7-15 kW

Operation

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ETA Heiztechnik Gewerbepark 1 A-4716 Hofkirchen an der Trattnach Tel: +43 (0) 7734 / 22 88 -0 Fax: +43 (0) 7734 / 22 88 -22 info@eta.co.at www.eta.co.at

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Contents

1 General information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Boiler functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5 Emission measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

6 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.2 Safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1 User interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1.2 Setting the date and time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1.3 Changing the names of function blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7.1.4 Text menu navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.1.5 Setting a time window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.1.6 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.2 Function block [Boiler] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.2.2 Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.2.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.2.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.3 [Buffer] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3.2 Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.3.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7.3.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7.4 [Hot water tank] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.4.2 Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.4.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7.4.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

7.5 [Fresh water module] 2 pumps function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.5.2 Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.5.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.5.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7.6 [Heating circuit] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.6.2 Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

7.6.3 The heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

7.6.4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.6.5 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

7.7 [Solar] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

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7.7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

7.7.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.7.3 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.8 [Pellet store] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.8.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.8.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

7.9 [Pellet store with switch unit] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7.9.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7.9.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7.9.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

7.9.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

7.10 [External heat source] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

7.10.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

7.10.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

7.10.3 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

8 Low-emission operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

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General information

1 General information

All contents of this document are property of ETA Heiztechnik GmbH and are protected by copyright. Any reproduction, transfer to third parties or use for other purposes is prohibited without written permission from the owner.

Subject to technical alterations

We reserve the right to make technical modifications without notice. Printing and typesetting errors or changes of any kind made in the interim are not cause for claims. Individual configurations depicted or described here are only optionally available. In the event of contradictions betwee n individual d ocuments regarding delivery scope, the information in our current price list applies.

Explanation of symbols

Instructions and information

Layout of safety instructions

SIGNAL WORD!

Type and source of danger

Possible effects

• Measures for avoiding the danger

Types of safety instruction

CAUTION!

On non-compliance with this safety instruction, there is a risk of material damage.

WARNING!

On non-compliance with this safety instruction, there is a risk of physical injury.

DANGER!

On non-compliance with this safety instruction, there is a risk of major physical injury.

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Preface

2 Preface

Dear Customer,

This user manual provides important information and instructions, to ensure safe and satisfactory operation of your product.

Please take the time to look through it.

Warranty and guarantee

You should also read the "Conditions for warranty, guarantee, liability" (see page 8) carefully. As a rule, these conditions will be satisfied by a professional heating technician. Nevertheless, inform the technician of our warranty conditions. All of the requirements we impose are intended to prevent damage that neither you nor we wish to occur.

Read the user manual

Please read the user manual carefully before starting up the system. This is the only way to ensure that you can operate your new boiler efficiently and with minimum environmental impact.

Take advantage of the knowledge and skills of an expert

Only allow an expert to assemble, install and commission the equipment and carry out the basic boiler settings. Insist on receiving an explanation and training on how your new boiler functions and how to operate and maintain it.

Extended warranty

We grant an extended warranty if the product is commissioned by an authorised partner company or by our own customer service.

In this connection, please note the warranty conditions applicable at the time of purchase.

Service agreement

You can ensure the best care for your heating system by taking out a service agreement with one of our certified contractors or our own customer service.

Remote control of the boiler via the internet

The remote control enables you to operate your ETA boiler remotely via your own network (VNC Viewer) or the internet <www.meinETA.at> using a PC, smartphone or tablet, as though you were standing right in front of the ETAtouch control system of your ETA boiler.

For details, see operating manual "meinETA communication platform".

A LAN cable is required for the connection from the ETAtouch control system to the internet modem.

For details see the boiler installation instructions.

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Preface

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Warranty, guarantee and liability

3 Warranty, guarantee and liability

Requirements

We can only accept liability for the function of our products if they are correctly installed and operated. This is only possible if the conditions below are complied with.

Maximum of 2,000 hours at full load per year

The boiler described in this user manual may only be used for heating and producing hot water , with no more than 2,000 full-load hours annually.

Installation in a dry room

For set-up, a dry room is required. In particular, only condensation dryers may be used as clothes dryers in the same room.

Observe local building and fire safety regulations

Local building and fire safety regulations must be observed.

Connecting pipe to chimney

The connecting pipe to the chimney must be a moisture-resistant stainless steel flue pipe with maximum diameter of 120 mm and at least 3 cm of insulation. For lengths over 2 m, correspondingly more insulation is needed.

Suitable fuel

The boiler is suitable for use with wood pellets according to ISO 17225-2:2014, quality class A1, ENplus-A1. Operation with unsuitable fuels, in particular those containing halogens (chlorine) or highslag pellets such as from grain waste, is not permitted.

Ensure supply air is free from aggressive substances

The air supplied to the boiler must be free from aggressive substances such as chlorine and fluorine from solvents, cleaning agents, adhesives and propellants, or ammonia from cleaning agents, to prevent corrosion of the boiler and chimney.

Only fill with softened water

Water is the intended heat-transfer medium. For special antifreeze requirements, up to 30% glycol may be added. Softened water is required for the initial fillup of the heating system and for refilling after repairs. Addition of hard water should be kept to a minimum to limit limescale build-up in the boiler.

For the initial fill-up, the lime content of all water in the heating system may not exceed the value of 10,000 lt°dH (system volume in litres multiplied by the hardness in degrees of German hardness).

pH value between 8 and 9

The pH value of water used to fill the heating system must be between 8 and 9.

Use a sufficient number of shut-off valves

Set enough shut-off valves to avoid bleeding large amounts of water during repairs. Any leaks in the system must be repaired at once.

Sufficiently large expansion tank

To protect against air suction if the system cools off, a specialist must design a sufficiently large expansion tank. The 18-litre expansion tank built into the boiler is sufficient for typical underfloor or radiat or systems. If there is a buffer storage tank, an additional expansion tank will be needed.

Sufficient air venting must also be ensured. Open expansion tanks or underfloor heating with permeable piping also have a high air intake, resulting in aboveaverage boiler corrosion. Corrosion damage to the boiler due to insufficient air venting or high air intake is excluded from warranty, guarantee and liability.

Sufficient power

Continuous operation with heat consumption below the minimum specified on the type plate is only permitted with a buffer storage tank of sufficient size.

Expanding the control system

Only components provided by us may be used for expanding the control system, unless these are generally available standard devices, such as thermostats.

Regularly perform cleaning and maintenance

Cleaning and maintaining the product is essential. The required steps and intervals are either contained in this documentation or included as a separate document.

Repairs

Repairs are only permitted using spare parts provided by us. The only exceptions are commonly available standard parts such as electrical fuses or fastening

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Warranty, guarantee and liability

materials, provided such parts have the necessary features and do not compromise the safety of the system.

Proper installation

The installing contractor is liable for proper installation according to the corresponding installation instructions and the relevant rules and safety regulations. If you as customer have installed the heating system partly or entirely without relevant training and in particular without up-to-date practical experience, without having the installation checked by a trained and responsible expert, we exclude defects in our delivery and consequential damages resulting from this cause from our warranty, guarantee and liability.

Repair of defects

For repairs of defects carried out by the customer or by a third party, ETA shall only bear the costs or remain obligated by warranty if this work was approved in writing in advance by the customer service of ETA Heiztechnik GmbH.

No tampering with boiler safety devices

Boiler safety devices such as those mentioned below must not be tampered with: Temp erature monitoring and control devices, safety temperature limiters, safety valves and thermal discharge valves.

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Boiler functionality

4 Boiler functionality

1 Heat exchanger with integrated return riser 2 Hot stainless steel combustion chamber 3Turbulators 4 Lambda probe 5Return 6 Draught fan 7 Flow mixing valve 8 Flow to water tank 9 Heating pump 10 Flow to heating circuit 1 11 Diverter valve between heating circuit 1 and hot

water tank

12 Air connection for operation with external air

supply 13 Ash screw 14 Movable, self-cleaning rotating grate

15 Detachable ash box 16 Expansion tank 17 Stoker screw 18 Rotary valve 19 Metering screw 20 Pellet bin 21 Suction motor for pellet transport

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Boiler functionality

How the boiler works

A suction motor sucks the pellets from the storage room, which may be up to 20 m away, into the pellet bin on the boiler. The p ellet bin has a capacity of up to 30 kg. Fill-up of the pellet bin takes place once a day at a time that can be set as needed. Only on very cold days might it be necessary for pellets to be fed to the boiler a second time.

The metering screw meters the pellets as they are conveyed from the pellet bin, to avoid overfilling the rotary valve. This way, pellets do not need to be cut. This protects the sealing edges and enables quiet operation. The rotary valve separates the pellet bin from the combustion chamber to prevent back burning in the pellet bin. The stoker scre w pushes the pellets into the combustion chamber.

The pellets are burned on the movable rotating grate. Automated cleaning takes place during breaks in combustion. The grate is rotated against a comb to clean the air gaps.

On a restart, the pellets are ignited with a ceramic igniter.

Beneath the grate and the heat exchanger, two ash screws convey the ash to a detachable ash box. This is large enough that it only needs to be emptied once or twice in each heating season.

In an uncooled, hot combustion chamber made of stainless steel, hot and complete burnout occurs before the combustion gases in the heat exchanger transfer the heat to the boiler water. Movement of the turbulators cleans the heat exchangers automatically once a day.

For heating systems without a buffer storage tank, all the devices needed for safe operation, such as the pump, flow mixing valve, diverter valve for hot wat er charging, expansion tank, boiler air vent and safety valve, are already installed in the boiler. If needed, a second heating circuit can be installed in the boiler.

The lambda probe, in combination w ith the variablespeed draught fan, ensures high efficiency.

The boiler can be operated with an external air supply by means of a heat-resistant air supply duct.

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Emission measurement

5 Emission measurement

Why measure emissions?

It is a requirement for the carbon monoxide (CO) emissions of every boiler to be measured periodically. In Germany, this periodic measurement must also include a dust measurement.

There are several aspects of this th at co uld go wr on g, resulting in incorrect measurements even though the boiler fully and consistently complies with these limits when operating in accordance with the relevant standards.

Notes on emission measurement in Germany

In accordance with the provisions of "BImSchV,"

lower limit values for the emission measurement in Germany apply to all new heating system installations starting 1 January 2015. Notes on compliance are found under 8 "Low-emission operation".

Clean the boiler 3 - 5 days before the emission measurement

Thoroughly clean the boiler and flue pipe 3 - 5 days before the emission measurement. Once this is complete, heating can resume as usual.

This delay between cleaning and measurement

is necessary in order to allow dust disturbed during cleaning to settle again. If the chimney sweep measures unsettled dust, the dust reading will be higher than normal and thus inaccurate.

CAUTION!

 Under no circumstances clean the boiler and flue

pipe on the day of the measurement!

Ensure sufficient heat consumption

Open all radiator valves and turn radiator thermost ats to maximum.

Allowing the boiler to cool

Switch off the boiler 3 to 5 hours before the emission measurement by pressing the [On/Off] button.

This allows the boiler to cool, and the additional water in the boiler is used to discharge heat during the emission measurement.

Setting the duration of the emission measurement

The duration of the emission measurement is

factory-set to 30 minutes. If necessary, this can be increased with the [Service] access level.

With the [Service] access level, change to the text menu of the [Boiler] function block. You can adjust the duration as follows:

Select the parameter and press [Change]. A settings screen opens. Select the desired duration and press [Accept] to save.

Emission measurement at full load

Before measurement at full load, the bo iler must

be operating in a heating phase for at least 15 minutes, and the boiler temperature must be over 65°C.

To start the emission measurement, press the [MEAS.]

button in the boiler overview scre en. As confirm ation, the button lights up green and the countdown in the button commences.

The boiler runs at full load for the set time. The control system ensures that sufficient heat is channelled to the heating circuits and the hot water tank.

The emission measurement may only take place

once the boiler has been operating in this way for at least 10 minutes (i.e. more than 10 minutes of the countdown have elapsed).

Boiler

Flue gas

Emission measure

MeasDuration

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Emission measurement

Selecting emission measurement for full load or partial load

National regulations may stipulate emission

measurement at partial load. If this is the case, you must set the required output range before commencing the emission measurement.

With the [Service] access level, change to the text menu of the [Boiler] function block. You can adjust the output range as follows:

Select the parameter and press [Change]. A settings screen opens:

Select the desired output range and pres s [Accept] to save.

If you select [Combination], measurements are

performed consecutively at full load and partial load.

Emission measurement at partial load

Switch on the boiler by pressing the [On/Off] button.

If you are performing the measurement at partial load, when you press the [MEAS.] button a message appears telling you that the boiler must be in a heating phase for at least 30 minutes before the emission measurement.

When you confirm this message, the boiler automatically starts heating. The countdown in the [MEAS.] button stops.

Once the boiler is ready for the emission mea-

surement, another message appears on the screen. When you confirm this message, the countdown in the [MEAS.] button starts and the boiler runs at partial load for the set duration. The control system ensures that sufficient heat is channelled to the heating circuits and the hot water tank.

The emission measurement can only take place

once the boiler has been operating in this way for at least 10 minutes (i.e. more than 10 minutes of the countdown have elapsed).

After the measurement

Switch the boiler back to normal mode by pressing [MEAS.]. As confirmation, the light in the button goes off.

If you do not press this button, the boiler will au-

tomatically switch back to normal mode aft er the set time (factory setting 30 minutes).

Boiler

Flue gas

Emission measure

Measurement type

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General information Safety

6 Safety

6.1 General information

Operation only by trained personnel

The product may be operated by trained adults only. Training may be provided by the heating technician or our customer service. Please read the associated documentation carefully in order to avoid errors during operation and maintenance.

The product may not be operated by persons with impaired physical, sensory, or mental capabilities. Persons who lack experience and knowledge as well as children may not operate, clean, or maintain the product.

Keep children away from the pellet store

Children must be kept away from the pellet store. It is a good idea to lock the door to the pellet store. The door handle on the inside of the pellet store must not be removed. It must be possible to open the door from the inside in an emergency.

Keep fire extinguishers in a clearly visible location

In Austria, the minimum requirement is an ABC powder extinguisher with 6 kg. An AB foam extinguisher with 9 litres, which produces less damage when used, is preferable. The fire extinguisher should be kept outside the boiler room, visible and easily accessible.

In Germany and Switzerland, fire extinguishers are not required for heating systems in private residences. In spite of this, we recommend having one in the house.

Storage of ash

The ash must be kept in non-flammable containers with covers. Do not put hot ash in the waste bin due to risk of fire.

Emergency stop switch for the boiler

In Austria, heating systems installed in boiler rooms must be equipped with an emergency stop switch. The switch must be situated immediately outside the access door and clearly marked. For boiler rooms that are only accessible from outdoors, these switches may also be within the boiler rooms, immediately next to the access doors.

A single-pole emergency stop switch is integrated into the boiler's safety chain. When actuated, it interrupts the supply of combustion air and fuel. The pumps continue running to cool the boiler.

6.2 Safety devices

Pump safety run, automatic heat dissipation at overtemperature

If the boiler temperature exceeds 90°C (factory setting) for any reason, the pump safety run will start. All heating pumps and boiler pumps that are connected to the boiler control system are switched on to dissipate heat from the boiler.

This action prevents the boiler temperature from rising further and triggering further safety devices such as the safety temperature limiter. The pump safety run is displayed on the screen as operating mode [Heat dissipation].

The heat dissipation is limited by the maximum flow temperature set in the heating circuits and

the target hot water temperature.

Safety shutdown by safety temperature limiter

For additional safety against boiler overheating, a safety temperature limiter is built into the boiler. When a boiler temperature of 105°C (tolerance 100 to 106°C) is reached, the power supply to the draught fan and the fuel intake is interrupted. If the boiler temperature decreases below 70°C again, the safety temperature limiter can be manually released for a restart of the boiler.

Safety valve against overpressure

A safety valve with 3 bar opening pressure has already been installed on the boiler at the factory. If solar or other heat sources provide energy to the buffer storage tank via a heat exchanger, a safety valve (3 bar maximum) is also required on the buffe r storage tank.

Normally an expansion tank that is too small or defective, or blocked heating lines, are the cause for activation of the safety valve. T he safety valve mu st be on the boiler at the top of the flow in order to discharge heat in an emergency. Only this way can it reduce pressure by blowing out hot water and steam.

DANGER!

Safety valve outlet

The safety valve outlet must be directed to the ground in a pipe so nobody is endangered by hot water or steam.

 The safety valve outlet must be directed to the

sewer via a clearly visible, open route (siphon funnel) so that malfunctions, especially a failure of

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Safety Safety devices

the safety valve to close, can be recognised. If no sewer connection is available, the outlet must be directed to the ground in a pipe.

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User interface Operation

7 Operation

7.1 User interface

7.1.1 Overview

Touchscreen user interface

The touchscreen only displays function blocks that are required and configured to work with your heating system.

1 Menu buttons 2 Heating system function blocks 3 Date and time 4 Remote control (meinETA)

Overview

Displays an overview screen of the selected function block.

Text menu

Allows you to change parameters of the selected function block.

I/O menu

Enables a specialist to assign inputs and outputs and manually operate the outputs of the selected function block.

Messages

Messages of the selected function block (notifications, warnings or errors)

Toolbox

Toolbox for the specialist.

Help

Displays additional information for a parameter selected in the text menu. If additional information is available, the symbol in the

button changes to .

7.1.2 Setting the date and time

Explanation

The ETAtouch control system allows you to adjust the date and time to suit your respective time zone.

The date and time are factory-set to Central European Time (UTC+01:00).

Changing the date and time

Press the button to open the function block overview screen.

Tap on the date or time at the bottom right-h and corner of the touchscreen.

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Operation User interface

A settings screen opens:

By tapping on [Day:], [Month :], [Year:] or [Time:], you can select the parameter that you wish to change.

Enter the new value and press [Accept] to save.

7.1.3 Changing the names of function blocks

Renaming function blocks

You can individually adapt the names of function blocks to make them easier for you to recognise.

If you are changing the names of function blocks, bear in mind that they should be kept short. This

will make the touchscreen clearer.

Changing a name

Tap [HC] twice to rename this function block. A small menu window opens:

Tap [Change name].

A keypad is displayed:

Enter the new name and press [Accept] to save.

To cancel the process and keep the original name, press [Cancel].

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User interface Operation

7.1.4 Text menu navigation

Using the text menu

For each function block, there is a text me nu. In this window, the available parameters are displayed and can be changed if necessary.

If additional information is available for a selected parameter, the symbol in the button changes to . This additional information is displayed when you press the button.

Only modify parameters if you know what their

function is. Before any changes, read the relevant section of the user manual or configuration manual, or the additional information displayed when you press . If you cannot find sufficient information about a parameter, please consult a specialist.

Text menu overview screen

Press the button and [HC], for example, to open the text menu of this function block.

1 Submenu opens 2 [Value] or [Change] 3 Selected parameter 4 Submenu is available

Modifying parameters

Example: Change the [Day heat. lim.] parameter in the [HC] function block.

First, press [HC] to select the function block.

Press to sw itch to the function block's text menu. The parameter can be found under:

It is possible to modify certain parameters in

order to adapt the heating system to your needs. When you select a parameter that can be changed, the [Value] field changes to the [Change] button.

Press the [Change] button or tap the parameter twice to open a settings window:

1 Name of the parameter 2 Factory settings 3 Adjustment range (minimum and maximum value)

Enter the new value and press th e [Accept] button to save.

Press the button to return to the overview window of the function block.

Heating circuit

Day heat. lim.

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Operation User interface

7.1.5 Setting a time window

Setting time window and temperatures

The time window is set with the timer for charging the tank (for example for accumulator tank and hot water tank), or the operating times (for example for the heating circuit).

1 Timer to set a time window

Setting a time window and the hot water

temperature for the hot water tank will be described in the following. This example applies accordingly for all other function blocks with timers.

To set the charging times, tap the

timer in the

overview. An overview opens.

Fig. 7-1: Overview

Set the individual time windows and temperatures by tapping the lines [Time slot 1:], [Time slot 2:], [Time slot 3:] and [Set-back temperature between time slots:]. A settings window appears after tapping.

Fig. 7-2: Settings window

Enter the time window and desired temperature and press [Accept] to save. Set the further time w indows the same way.

Press the [Delete] button to delete a set time window and restore the factory settings.

Copying time windows

After you have set the time windows, you can copy them for other days of the week. To do this, tap the [Copy] button in the overview screen.

Fig. 7-3: Overview

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User interface Operation

A screen opens showing the individual days of the week.

Fig. 7-4: Copying time windows

Make your selection and press the [Accept] button to save.

7.1.6 Messages

Overview of messages

Press the button to go to the messages overview of the selected function block.

1 Symbol for the highest priority type of all occurred

messages 2 Symbol for the type of individual message 3 Button for acknowledging a message 4 Brief description of the message 5 Detailed description of the message

In the event of an error, alarm or warning in a function block, the symbol of the button changes.

The possible states are:

• No messages present

• There is a warning

• There is an error or alarm

Types of message

• Notification

A notification does not interrupt operation, and

therefore no acknowledgement is requir ed. Notifi-

cations inform the user, for example, that pump

anti-blocking protection has been activated.

• Warning

A warning is displayed on failure of a function that

is not absolutely essential for continued operation.

It can be acknowledged before the cause of failure

is remedied. However, it will continue to be

displayed until the cause has actually been dealt

with.

• Error, alarm

An error or alarm stops operation. Some of these

can be acknowledged before the cause of the

problem is remedied. However, they will continue

to be displayed until the cause has actually been

dealt with.

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Operation User interface

Other errors and alarms can only be acknowledged after the cause has successfully been remedied. You can then delete these messages with the [Confirm later] button.

Once an error or alarm has been resolved and acknowledged, you must restart the boiler or the affected heating circuit by pressing the [On/Off] button.

Acknowledging an error

Press the button to open the message window of the selected function block.

Select the message that you wish to acknowledge. When you press [Conf.] or tap the row twice, a notice

appears. Press [OK] to acknowledge the message and delete it

from the list.

Acknowledging all errors

Tap [Boiler] twice to acknowledge all errors for this function block. A small menu wind ow opens. Tap on the [Confirm error] field in this window.

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Function block [Boiler] Operation

7.2 Function block [Boiler]

7.2.1 Overview

Boiler overview

Press the button and [Boiler] to open the boiler overview window.

Switching the boiler on and off, additional de-ashing, setting the fill-up time and emission measurement all take place in this overview screen.

1 Operating condition 2 Pellet stock in boiler 3 Temperature [Boiler] 4 Heating coil 5 [MEAS.] button 6 [FILLTIME] button 7 [On/Off] button 8 [ASH] button 9 Boiler pressure (pressure in heating system) 10 Outside temp.

[On/Off] button

This button switches the boiler on and off. If the boiler is on, this button appears green .

[ASH] button

This button starts boiler de-ashing. If the boiler is in operation, burnout first takes place when

this button is pressed, and de-ashing only after this. If the boiler is switched off or on standby, deashing can be started straight away.

[MEAS.] button

This button switches the boiler to full load for a period of 30 minutes for the emission measure-

ment. The heat is discharged into the heating circuits and the hot water tank. When the 30 minutes are over, the boiler automatically switches back to normal mode.

[FILLTIME] button

This button sets the daily time for complete

refilling of the pellet bin on the boiler, if pellets

have been used up. This prevents refilling during the night. This time applies for every day of the week.

Boiler pellet stock

The current stock of pellets in the boiler is displayed. If this stock drops below the minimum level of 5 kg, the suction motor starts

and refills the pellet bin.

Heating coil for heating circuit

This symbol is displayed next to the boiler as soon as it supplies heat to the heating circuit.

The displayed temperature is the flow

temperature in the heating circuit.

Heating coil for second heating circuit

Optional: Only for [2nd internal HC (PelletsUnit 7-15 kW only)]

This symbol is displayed at the top next to the boiler as soon as it supplies heat to the second heating circuit.

The displayed temperature is the flow temperature to the second heating circuit.

Hot water tank or buffer

This symbol is displayed next to the boiler as soon as it supplies heat to the hot water tank or buffer.

The displayed temperature is the flow temperature to the tank.

Boiler functionality

Press the [On/Off] button to switch the boiler on and off. When the boiler is switched on, heating starts as soon as there is demand from the connected consumers (either the buffer , heating circuits or the hot water tank).

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Operation Function block [Boiler]

The control system calculates the required boiler temperature based on the flow temperatures demanded by the consumers. When the boiler is supplying heat to the consumers, the "Heating coil" or "Tank" symbols appear in the overview screen.

The minimum running time for the boiler heating phase is 30 minutes. If there is no more demand from the consumers after that time, the boiler ends the heating phase with a burnout. The operating mode changes to [Ember burnout] and then to [Ready].

The pellet bin on the boiler is automatically topped up as soon as the stock of pellets falls below a minimum limit. The [FILLTIME] button sets the daily time for complete refilling of the pellet bin on the boiler if pellets have been used up, see page 24.

Boiler de-ashing takes place within a configurable interval, see page 25. De-ashing can also be disabled for a time, e.g. to prevent the boiler from de-ashing at night, see page 25.

After a certain, configurable quantity of pellets has been consumed, the control system issues a reminder to empty the ash box. If the ash box is only partially full, this quantity can be increased, see page25.

7.2.2 Operating modes

Switched off

The boiler is off. The [On/Off] button in the overview screen lights up red.

Fill up pellet bin

The suction process for refilling the boiler pellet bin has been started.

Filling stopped for ignition

The suction process for refilling the boiler pellet bin has been stopped, in order to ignite pellets for a boiler heating phase. After ignition, the fill-up process is restarted.

Warm Start

An attempt is made to ignite the fuel without the electrical ignition using only the heat stored in the combustion chamber.

Igniting

The fuel is ignited using the electrical ignition.

Heating

The boiler is in heating mode and is channelling heat to the consumers.

Ember burnout

At the end of the heating phase, the fuel that is still on the grate is burnt off. No more fuel is fed into the boiler.

Ashbox missing

The ash box is not connected to the boiler.

Filling stopped for de-ashing

The suction process for filling the boiler pellet bin has been stopped for boiler de-ashing. After de-ashing, the fill-up process is restarted.

Ready

When ember burnout is complete, the still switched-on boiler is in standby waiting for a heating demand.

De-ash

The boiler is de-ashing.

Malfunction during ash removal

The ash screw has been switched off due to excessive current consumption. This may be due to a full ash box or blockage of the ash screw by foreign objects.

Malfunction

A malfunction has occurred, preventing the boiler from heating. The cause can be found in the list of error messages.

Ember burnout due to a malfunction

The current heating phase has ended with ember burnout due to a malfunction.

Ember burnout due to external locking

Due to an external lockout (Stop command), the current heating phase has ended with ember burnout.

Locked

Heating not possible, as the boiler has been locked externally (Stop command).

Calibrating lambda probe

The lambda probe is undergoing automatic calibration. It is not possible for the unit to heat whilst in this mode.

Fill

Pellets are being conveyed to the combustion chamber for subsequent ignition.

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Function block [Boiler] Operation

Preheat

The boiler ignition is switched on.

7.2.3 Operation

Setting the fill-up time

The [FILLTIME] button sets the daily time for complete refilling of the boiler pellet bin, if pellets have been used up. This prevents refilling during the night. This time applies for every day of the week.

To set the daily fill-up time, press the [FILLTIME] button in the overview screen.

A screen opens:

Fig. 7-5: Setting the fill-up time

Enter the desired time and press [Accept] to save.

You can completely refill the pellet bin immediately by pressing the [Startfilling] button.

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Operation Function block [Boiler]

7.2.4 Text menu

Adjustable parameters

In function block [Boiler], switch to the text menu with the button.

Detailed descriptions of the parameters are provided below.

7.2.4.1 Setting the idle time for boiler de-ashing

Explanation of [Duration idle time]

The [Duration idle time] parameter is used to select the duration of the idle time for complete boiler de-ashi ng. With the [Start idle time] parameter, you can set the time you want this idle time to start.

The idle time is factory-set to 10 hours, and the

start of the idle time to 21:00. The idle time should be kept as short as possible. If n o noise pollution is expected, you should set the value to 0hours.

Setting the boiler idle time

The parameters can be found und er:

Select the parameter and press the [Change] button. A settings window will open.

Enter the duration or start time and press [Accept] to save.

7.2.4.2 Boiler de-ashing interval

Explanation of [De-ash after min.] and [De-ash after max.]

The boiler's de-ashing interval is set with the [De-ash after min.] and [De-ash after max.] parameters. The boiler de-ashes within the range specified by these two parameters.

Changing the de-ashing interval

The parameters can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

The de-ashing interval may only be modified after consultation with a specialist or ETA customer

service.

7.2.4.3 Empty ash box after

Explanation of [Empty ash box after]

This parameter adjusts the quantity of pellets used, after which a reminder to empty the ash box is displayed on the screen.

If the ash box is then only partially full, this quantity can be increased. If you set the value to zero, the reminder will no longer appear.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Boiler

Ash removal

Start idle time Duration idle time De-ash after min. De-ash after max. Empty ash box after

Boiler

Ash removal

Start idle time Duration idle time

Boiler

Ash removal

De-ash after min. De-ash after max.

Boiler

Ash removal

Empty ash box after

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[Buffer] function block Operation

7.3 [Buffer] function block

7.3.1 Overview

Buffer storage tank overview screen

Press the button and [Buffer] to open the overview screen of the buffer storage tank. Here the curren t temperatures, operating mode and charging status are displayed.

1 Operating condition 2 Buffer charging status 3 Temperature: [Buffer top] 4 Temperature: [Buffer middle] 5 Temperature: [Buffer bottom] 6 Charging by solar heating system, temperature

[Collector] 7 Timer: [BufferChrgTimes] 8 Temperature: [Buffer bottom Solar] 9 Charging by boiler

Buffer charging status

By means of the 3 temperatur e sensor s on the bu ffer, the current charging status is determined and displayed in the overview screen.

A charging status of 0% means that the buffer has only been charged to the configured [Return from consumers] temperature, or lower. 100% means that the buffer has been ch arged up to the currently required [Buffer target] temperature.

Charging by boiler

This symbol is displayed when the buffer is being charged by the boiler.

If a combination tank is installed, the symbol is

shown at the top of the buffer when the hot water rapid charge function is active. If the buffer is charged below the hot water section, the symbol appears in the centre of the buffer.

Charging by the solar heating system

Optional: for solar heating system

This symbol indicates that the tank is being charged by the connected solar

heating system. The displayed temperature corresponds to the temperature of the collector.

Timer [BufferChrgTimes]

This timer displays the configured charging times for the current day for charging the buffer. These time windows are displayed as a black bar in the timer.

This timer only applies to the charging of the buffer storage tank, not for a solar heating

system, if one is connected.

Timer [HW charging times]

Optional: for [Combin. tank]

With a combination tank, this timer displays the configured charging times for charging the ho t water on the current day. These time windows are displayed as a black bar in the timer.

[Extra charge] button

Optional: for [Combin. tank]

With a combination tank, this button enables the hot water section to be charged to the

configured hot water temperature outside the set time slot if the temperature has dropped below [Switch-on diff.].

How the buffer storage tank works

You can set different time slots inside which the boiler can charge the buffer (see page 30). Inside a time slot, the control system establishes the required buffer temperature [Buffer target] based on the current demand from the consumers (heating circuit, hot water tank...).

By means of the 3 temperatur e sensor s on the bu ffer, the current charging status is determined and displayed in the overview screen.

Page 27

Operation [Buffer] function block

The buffer is charged by the boiler until the current [Buffer top] temperature has exceeded the required [Buffer target] temperature, and the configurable [Buff. bottom off] temperature (see pa ge 32) has also been exceeded. The operating state of the buffer then changes to [Charged].

If there is no demand from consumers, inside the set time slot the buffer is charged to the configurable minimum temperature [Buffer top min.] (se e page 31).

Buffer with solar heating system

Optional: only for [Solar charging] The additional temperature [Buffer bottom Solar] is

displayed at the bottom of the overview screen, in the buffer storage tank.

Fig. 7-6: Buffer with solar heating system

1 Temperature [Buffer top] 2 Temperature [Buffer middle] 3 Temperature [Buffer bottom] 4 Temperature [Buffer bottom Solar] 5 Charging by solar heating system, temperature

[Collector]

Solar charging of the buffer is controlled by switching the solar panel pump on and off. Solar chargin g begins as soon as the [Collector] temperat ure is 5°C higher than the [Buffer bottom Solar] temperature. The solar charging symbol appears in the overview screen.

If the [Collector] temperature falls below the [Buffer bottom Solar], solar charging ends with the solar panel pump switching off.

The configurable [Buffer bottom max] temp erature sets the limit for buffer charging by the solar heating system to prevent the buffer from overheating (see page34).

The [Solar prio.] function enables the solar heating system to charge the buffer without the boiler being started, inside 2 configurable time slots (see page 34).

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[Buffer] function block Operation

Buffer with solar heating system and stratified charging valve

Optional: only with [Solar charging] and [... additional solar charging in buffer middle]

The two temperatures [Buffer top Solar] and [Buffer bottom Solar] are displayed in the overview screen.

Fig. 7-7: Buffer with solar heating system and stratifi ed

charging valve

1 Temperature [Buffer top] 2 Temperature [Buffer middle] 3 Temperature [Buffer bottom] 4 Temperature [Buffer top Solar] 5 Charging by solar heating system, temperature

[Collector]

6 Temperature [Buffer bottom Solar] The stratified charging valve on the buf fer storage tank

switches solar charging between [Buffer bottom] and [Buffer top]. During this process, the [Buffer top Solar] and [Buffer bottom Solar] temperatures are continuously compared with the current [Collector] temperature.

The solar charging symbol is shown at the top or centre of the buffer, depending on

which part of the buffer is currently being charged.

Combination tank (buffer with int egrated hot water tank or coil)

Optional: for [Combin. tank] If a combination tank (i.e. a buffer with integrated hot

water tank or internal water heat exchanger) is installed, the hot water temperature is shown in the overview screen in the upper part of the buffer.

Additionally, a second timer [HW charging times] is displayed, which is used to set the hot water temperatures and charging times (see page 30). The [Extra charge] button is also displayed, for charging hot water outside the time slots.

Fig. 7-8: Combination tank

1 Timer [HW charging times] 2 Temperature [Hot water tank] 3 [Extra charge] button

The configurable [Switch-on diff.] parameter additionally allows you to determine how far the current [Hot water tank] temperature can drop before the hot water tank again demands heat from the buffer (see page 35).

Page 29

Operation [Buffer] function block

7.3.2 Operating modes

Charged

The buffer is charged to the required [Buffer target] temperature, and the [Buffer bottom] temperature sensor has exceeded the configurable [Buff. bottom off] temperature once.

Demand

The buffer is demanding heat from the heat producer.

Chrg.

The boiler is supplying heat to the buffer.

FreezeProt

A temperature sensor in the tank has fallen below the [FreezeProt] temperature.

The frost protection limit is factory-set to 5°C.

ResidHeat

After the boiler heating phase, its residual heat is conveyed to the tank.

Heat dissipation

The tank is being charged to discharge excess heat from the boiler.

Sensor error

A temperature sensor is faulty. You can find this temperature sensor in the message list by pressing the

button.

Timer off

There is demand by the tank, but the current time is outside the time slot configured in the timer. The tank is therefore not charged.

Extra hot water charge

The [Extra charge] button has been pressed to activate extra charging outside a time slot when a combination tank is installed.

Solar prio.

Solar priority has been activated, and tank charging by the boiler is disabled. The current time is inside a configured time slot for solar priority, and the current outside temperature is higher than the set temperature [Min. out. temp. Solar prio.].

ChargeBuffer

The combination tank is demanding heat from the boiler.

Charge hot water

Only the hot water section of the combination tank is demanding heat. Only the upper section of the combination tank is being charged.

Solar heat diss.

Excess heat is being taken from a buffer that is being charged by a solar heating system.

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[Buffer] function block Operation

7.3.3 Operation

Setting the accumulator tank charging times

With the [BufferChrgTimes] timer, you can set 3 different time windows for the accumulator tank for each day of the week. The accumulator tank is only charged by the boiler within a time window. The sole exception is the [Heat dissipation] operating condition.

To set the charging times, tap the [BufferChrgTimes]

timer in the

overview. A screen opens.

Fig. 7-9: Overview screen of set charging times

You can find further details about setting the time window in chapter 7.1.5 "Setting a time window".

Setting charging times and temperature for hot water with a combination tank

With the combination tank, the additional [HW charging times] timer is used to set 3 different time windows and temperatures fo r the hot water for ea ch day of the week.

Within a time window, the hot water is charged to

the set temperature. Outside a time window, the hot water is charged to the set temperature [Set-back temperature between time slots:].

To set the charging times, tap the [HW charging times]

timer in the

overview. A screen opens.

Fig. 7-10: Overview of hot water charging times

You can find further details about setting the time window in chapter 7.1.5 "Setting a time window".

Setting circulation times with combination tank

Optional: only for combination tank with circulation pump

With a combination tank, the settings of the

circulation times are made in the text menu. You can set 3 different time windows for the circulation times of the circulation pump for each day of the week.

Press to sw itch to the function block's text menu. The time windows are in:

The individual weekdays are listed. Select a weekday and in the submenu select the

desired time window [Time slot 1], [Time slot 2] or [Time slot 3]. Press [Change] to open the settings window.

Set the circulation times to be as short as

possible to ensure good buffer stratification and prevent limescale build-up.

Buffer

Hot water tank

Circulation

Circulation times

Page 31

Operation [Buffer] function block

7.3.4 Text menu

Adjustable parameters

The following parameters can be configured for the basic function in the buffer text menu.

If a solar heating system is additionally connected to the buffer, further parameters can be set.

If the buffer is implemented as a combination tank, further parameters can be set.

Detailed descriptions of the paramet ers are provided below.

7.3.4.4 Buffer top min.

Explanation of [Buffer top min.]

This parameter defines the minimum temperature of the buffer storage tank inside the configured time slot.

This parameter is factory-set to 10°C. The higher

this temperature is set, the larger the heat reserve in the buffer. At the same time, however, higher temperatures in the buffer al so reduce the solar yield, because the buffer is kept at the [ Buffer to p min.] temperature using energy from the boiler, even if there is no demand from the consumers.

The factory setting can remain unchanged, as long as all components of the heating system are controlled by the ETA control system. A higher value is required if peaks in output have to be covered, or very fast heat availability is needed.

Modifying parameters

The parameter can be found under:

Buffer

Buffer top

Buffer top min.

Buffer bottom

Buff. bottom off

Extra charge

Buffer top min. Buff. bottom off Extra charging from ChrgButton

Buffer

Solar heat diss.

Activate? ...until buffer max

Buffer top Solar

Buffer top min. solar Min. out. temp. Solar prio. Priority

Buffer bottom Solar

Buffer bottom max Solar prio.

Solar prio. Begin solar prio. Change priority at End solar prio. Min. out. temp. Solar prio.

Extra solar heat

from outside temp. at buffer top

at buffer bottom sol.

Priority

a. Only visible with several buffer storage tanks and solar

heating system b. Only visible with solar heating system and buffer with 2

internal coils c. Only for solar heating systems with switchover between

several tanks

Hot water tank

Switch-on diff.

Circulation

Circulation runtime Circulation pause Enable circulation

Buffer

Buffer top

Buffer top min.

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[Buffer] function block Operation

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.5 Buff. bottom off

Explanation of [Buff. bottom off]

This parameter ends charging of the buffer storage tank by the boiler. As soon as the [Buffer bottom] temperature sensor in the buffer storage tank has exceeded the configured [Buff. bottom off] temperature, charging of the buffer by the boiler is stopped.

This parameter is factory-set to 40°C. The value

should be at least 5 - 10°C above the average return temperature of the consumers, but no more than 70°C.

A high [Buff. bottom off] temperature reduces the number of boiler starts and improves boiler running time.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.6 Function [Extra charge]

Explanation of the [Extra charge] function

This function defines a daily point in time for the buffer (=[Extra charging from]) to charge the buffer additionally. This charging is done independently of the actual consumer requirements and independently of the set time windows. A separate minimum temperature [Buf fer top min.] and shutdown temperature [Buff. bottom off] can be set for this charge. Charging ends as soon as the buffer reaches these temperatures.

The function is deactivated if one of the two tem-

peratures is set to "0".

Setting the function

The parameters can be found under:

At first, set the parameter [Extra storage activated?] to [Yes], than the other parameters

will be displayed. Select temperatures [Buffer top min.], [Buff. bo ttom off]

and the time [Extra charging from] and press [Change]. In the settings window, set the desired values and save them with [Accept].

To immediately start this additional buf fer charge, simply set parameter [ChrgButton] to [On].

7.3.4.7 Solar heat diss.

Explanation of the [Solar heat diss.] function

Optional: Only for several buffer storage tanks and solar heating system

This function defines whether the selected buffer may take up excess solar heat from a buffer charged by the solar heating system.

If you set the function with the [Activate?] parameter set to [Yes], this buffer takes up the solar excess. This buffer is then charged up to the configured maximum temperature [...until buffer max].

As the factory setting, this function is switched off and the maximum temperature [...until buffer

max] is limited to 70°C .

Activating the function

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Buffer

Buffer bottom

Buff. bottom off

Buffer

Extra charge

Extra storage activated? Buffer top min. Buff. bottom off Extra charging from ChrgButton

Buffer

Solar heat diss.

Activate? ...until buffer max

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Operation [Buffer] function block

Make your selection and press the [Accept] button to save.

7.3.4.8 Priority of the upper and lower sections

Explanation of [Priority]

Optional: Only with solar heating system and buffer with 2 internal coils

This parameter sets the priority of the top and bottom sections of the buffer for solar charging. A high priority means that this section will be charged by the solar heating system first. A low priority means that it will be charged last.

The priority for the top section is factory-set to [High], and to [Middle] for the bottom section.

Modifying parameters

The priority for the top section is under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

Set the priority for the bottom section of the buf fer in the same way. You will find this in:

7.3.4.9 Buffer top min. solar

Explanation of [Buffer top min. solar]

Optional: Only for solar heating panels with stratified charging

With stratified charging by the solar heating system, this sets a minimum temperature for the top section of the buffer. This way, solar charging only takes place in the top section once the solar panel is at least 7°C warmer than [Buffer top min. solar].

However, this minimum temperatur e only ap plies

if the conditions for stratified charging are satisfied. If they are not, solar charging is switched to the bottom section of the buffer, to make use of the solar energy.

This parameter is factory-set to 30°C.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.10 Min. out. temp. Solar prio.

Explanation of [Min. out. temp. Solar prio.]

This parameter sets the minimum value for the outside temperature, so that one of the conditions for solar priority and stratified charging of the buffer storage tank is satisfied.

This value is factory-set to 10°C.

Modifying parameters

The parameter can be found under:

or also in:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Buffer

Buffer top Solar

Priority

Buffer

Buffer bottom Solar

Priority

Buffer

Buffer top Solar

Buffer top min. solar

Buffer

Buffer top Solar

Min. out. temp. Solar prio.

Buffer

Buffer bottom Solar

Solar prio.

Min. out. temp. Solar prio.

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[Buffer] function block Operation

7.3.4.11 Buffer bottom max

Explanation of [Buffer bottom max]

Optional: Only with solar heating systems This switch-off temperature can only be set when the

solar heating system is charging the buffer. This configurable temperature sets a threshold for how much the buffer can be charged by the solar heating system, in order to prevent the buffer from overheating. If the [Buffer bottom Solar] temperature sensor reaches the configured [Buffer bottom max] temperat ure, th e solar panel pump of the solar heating system is switched off.

This parameter is factory-set to 90°C.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.12 Solar prio.

Explanation of [Begin solar prio.], [Change priority at] and [End solar prio.]

Optional: Only with solar heating systems These parameters set the time slots for the [Solar prio.]

function. The first time slot lasts from [Begin solar prio.] to

[Change priority at]. The second time slot begins with [Change priority at] and ends with [End solar prio.].

Outside the 2 time slots, the boiler can charge the buffer at any time.

Set the start of solar priority before the first time

slot of the heating circuit and hot water tank. Otherwise, the boiler may start beforehand, in order to charge the heating circuit or hot water tank.

During the configured times for solar priority, it

may happen that the heating circuits or the hot water are not supplied with sufficient heat.

Setting a time window

The parameters for setting the 2 time windows are in:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Set the start of solar priority before the first time

window of the heating circuit and hot water tank. Otherwise, the boiler may start beforehand, in order to charge the heating circuit or hot water tank.

During the configured priority times, it may be th e

case that the heating circuits or the hot water are not supplied with sufficient heat.

Switch function on or off

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

7.3.4.13 Extra solar heat

Explanation of [Extra solar heat]

Optional: Only with solar heating systems This function defines whethe r the buffer storage tank

may convey this excess heat from th e solar heating system to other consumers, even if they do not currently require any heat.

The following conditions must be met in order for

the excess solar heat to be passed on in this way:

• The outside temperature must have exceeded the

configurable value [from outside temp.] (factory setting 10°C).

Buffer

Buffer bottom Solar

Buffer bottom max

Buffer

Buffer bottom Solar

Solar prio.

Begin solar prio. Change priority at End solar prio.

Buffer

Buffer bottom Solar

Solar prio.

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Operation [Buffer] function block

• The [Buffer top] temperature in the buffer must have exceeded the configurable value of [at buffer top] (factory setting 100°C).

• The [Buffer bottom Solar] temperature in the bu ffer must have exceeded the configurable value of [at buffer bottom sol.] (factory setting 50°C).

• In the function block for the hot water tank, heating circuits or other buffer storage tanks. the [Solar heat diss.] parameter must be set to [Yes], so that the buffer can request these consumers to take on the excess solar heat.

The parameters [from outside temp.], [at buffer top] and [at buffer bottom sol.] can be configured in the buffer text menu.

The [Solar heat diss.] parameter can be configured in the text menu of the [HW] or [HC] function block.

Changing the conditions

The parameters can be found und er:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.14 Priority of the buffer

Explanation of [Priority]

Optional: Only for solar heating systems with switchover between several tanks

This parameter sets the priority for solar charging of the buffer. A high priority means that this tank will be charged by the solar heating system first. A low priority means that it will be charged last.

The priority for the buffer is factory-set to [M iddle].

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

7.3.4.15 Switch-on diff.

Explanation of [Switch-on diff.]

Optional: only with combination tank With a combination tank, this parameter regulates how

far the current [Hot water tank] temperature can fall before the hot water tank again demands heat from the boiler.

The factory setting for this parameter is 15 °C.

The current [Hot water tank] temperature may therefore fall 15 °C from the [Hot water tank target] value. The combination tank does not demand heat from the boiler unless this happens.

With a combination tank, this value can be set to

approximately 5 °C to 8 °C if the amount of hot water is insufficient.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.16 Circulation runtime

Optional: only for combination tank with circulation pump

Explanation of [Circulation runtime]

Optional: Only with circulation pump This parameter sets the duration for operation of the

circulation pump after it has been started. This period is only valid inside the set time slot.

After the set period has expired, the circulation

pump is switched off for the configurable duration of the [Circulation pause] parameter.

Buffer

Buffer bottom Solar

Extra solar heat

from outside temp. at buffer top at buffer bottom sol.

Buffer

Priority

Hot water tank

Switch-on diff.

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[Buffer] function block Operation

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.17 Circulation pause

Optional: only for combination tank with circulation pump

Explanation of [Circulation pause]

Optional: Only with circulation pump This parameter sets the period (pause) after a

circulation pump operating phase. The control system can only restart the circulation pump after this time has elapsed. This pause is only valid inside the set time slot.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.3.4.18 Enable circulation

Optional: only for combination tank with circulation pump

Explanation of [Enable circulation]

Optional: Only with circulation pump This parameter defines the minimum temperature of

the hot water tank for starting the circulation pump. The circulation pump only starts once the hot water tank has exceeded this temperature.

This value is factory-set to 40°C.

Modifying parameters

The [Service] access level is required to perform modifications.

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Hot water tank

Circulation

Circulation runtime

Hot water tank

Circulation

Circulation pause

Hot water tank

Circulation

Enable circulation

Page 37

Operation [Buffer] function block

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[Hot water tank] function block Operation

7.4 [Hot water tank] function block

7.4.1 Overview

Hot water tank overview screen

Press the button and [HW] to open the hot water tank overview screen. Here, the current temperatures and operating mode are displayed.

1 Operating mode 2 Charging by boiler 3 Temperature: Hot water 4 Charging by solar heating system 5 [Extra charge] button 6 Temperature: Hot water tank bottom 7 Timer: ChrgTimes

[Extra charge] button

This button causes the hot water tank to be charged to the highest set temperature of all

time slots and days of the week if the temperature has dropped below [Switch-on diff.], ignoring the current time slot.

Charging by boiler or buffer

This symbol is displayed when the hot water tank is being charged by the boiler or

buffer. The displayed temperature is the [Boiler] or [Buf fer top] temperature.

Charging by the solar heating system

Optional: for solar heating system

This symbol indicates that the tank is being charged by the connected solar

heating system. The displayed temperature corresponds to the temperature of the collector.

Hot water tank with solar heating system

Solar charging of the hot water tank is controlled by the solar panel pump switching on and off. Solar charging begins as soon as the [Collector] temperature is 7°C higher than the [Hot water tank bottom] temperature. The solar charging symbol appears in the overview screen.

If the difference between the [Collector] and [Hot water tank bottom] temperatures is less than the threshold value of 3°C, solar charging stops.

Timer [HW charging times]

This timer displays the set charging times of the current day for charging the hot water tank. These tim e windows are displayed as a black bar in the timer.

Timer [Circulation times]

Optional: for [Circulation pump]

This timer displays the set times of the current day to operate the circulation pump. These time windows are displayed as a black bar in the timer.

Lower part of hot water tank

Optional: For [Hot water tank bottom] or [Solar] The temperature in the lower part of the hot water tank

is only displayed if the additional temperature sensor [Hot water tank bottom] is installed.

How the hot water tank works

You can set different time slots and temper atures for each day of the week for charging the hot water tank. Inside a time slot, the hot water tank is charged to the configured temperature (see page 40).

Charging commences as soon as the current [Hot water] temperature is below the temperature se t in the timer by the configurable value [Switch-on diff.]. The hot water tank then demands heat from the buffer or boiler. Charging ends as soon as the current [Hot water] temperature has reached the temperature set in the timer. The operating m ode then changes to [Charged].

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Operation [Hot water tank] function block

If an additional temperature sensor [Hot water

tank bottom] is installed for the lower part of the hot water tank, charging ends as soon as this sensor has reached the configurable temperature [HW bottom off].

If you also wish to charge the hot water tank outside the time slot, press the [Extra charge] button.

If a circulation pump is configured for the hot water, a second timer [Circulation times] is displayed for setting the operating times.

7.4.2 Operating modes

Demand

The hot water tank demands heat from the buffer or boiler. If the boiler is switched on and the buffer is unable to deliver sufficient heat, the boiler switches to heating mode.

Chrg.

The hot water tank is being charged by the boile r or buffer.

Extra charge

The [Extra charge] was pressed for charging the hot water tank outside the set time slots.

Delay

The charging pump of the hot water tank continues running briefly to discharge excess heat from the boiler.

Charged

The hot water tank has reac hed the set temperature [Hot water tank target].

Heat dissipation

The tank is being charged to discharge excess heat from the boiler.

FreezeProt

A temperature sensor in the tank has fallen below the [FreezeProt] temperature.

The frost protection limit is factory-set to 5°C.

Sensor error

A temperature sensor is faulty. You can find this temperature sensor in the message list by pressing the

button.

Timer off

There is demand by the tank, but the current time is outside the time slot configured in the timer. The tank is therefore not charged.

Solar prio.

Solar heat diss.

Excess heat is being taken from a buffer that is being charged by a solar heating system.

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[Hot water tank] function block Operation

7.4.3 Operation

Set charging times and temperatures for the hot water tank

The [HW charging times] timer enables you to configure 3 different time windows an d temperatures for the hot water tank for each day of the week.

Within a time window, the hot water is charged to

the set temperature. Outside a time window, the hot water is charged to the set temperature [Set-back temperature between time slots:].

The [Switch-on diff.] is also taken into consider-

ation for the set temperature [Set-back temperature between time slots:].

To set the charging times, tap the [HW charging times]

timer in the

overview. A screen opens.

Fig. 7-11: Overview of hot water charging times

You can find further details about setting the time

window in chapter 7.1.5 "Setting a time window".

Setting circulation times for the circulation pump

With the [Circulation times] timer, you can set 3 different time windows for the circulation time s of the circulation pump for each day of the week.

To set the circulation times, tap the [Circulation times]

timer in the

overview screen. A screen opens.

Fig. 7-12: Overview of circulation times

Set the circulation times to be as short as possible to ensure good buffer stratification and

prevent limescale build-up.

You can find further details about setting the time window in chapter 7.1.5 "Setting a time window".

Page 41

Operation [Hot water tank] function block

7.4.4 Text menu

Adjustable parameters

In function block [HW], switch to the text menu with the

button.

Detailed descriptions of the parameters are provided below.

7.4.4.19 Switch-on diff.

Explanation of [Switch-on diff.]

This parameter regulates how far the current [Hot water tank] temperature can fall before the hot water tank again demands heat from the buffer or boiler.

This parameter is factory-set to 15°C. The current

[Hot water tank] temperature may therefore fall 15°C below the value [Hot water tank target] set in the time slot. The hot water tank only demands heat from the buffer or boiler when this happens.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.4.4.20 HW bottom off

Explanation of [HW bottom off]

Optional: Only with additional [Hot water tank bottom] temperature sensor

This parameter defines when charging of the hot water tank will end.

As soon as the additional [Hot water tank bottom] temperature sensor in the hot water tank reaches the adjustable [HW bottom off] temperature, charging of the hot water tank ends.

This parameter is factory-set to 10°C.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.4.4.21 Solar heat diss.

Explanation of [Solar heat diss.]

Optional: Only for buffers with solar heating system This parameter defines whether the hot water tank

may take excess solar heat from the buffer. If this parameter is set to [Yes], the hot water tank takes the solar excess up to the maximum temperatur e [Hot water tank max.].

This parameter is factory-set to [No].

You must check the conditions for the [Extra solar heat] function in the text menu of the [Buffer] function block.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

Hot water tank

Switch-on diff. HW bottom off

a. Only visible with additional temperature sensor

Solar heat diss.

b. Only visible for buffers with solar heating system

Priority

c. Only visible for solar heating systems with switchover

between several tanks

Circulation

d. Only visible with additional circulation pump

Circulation runtime Circulation pause

Hot water tank

Switch-on diff.

Hot water tank

HW bottom off

Hot water tank

Solar heat diss.

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[Hot water tank] function block Operation

7.4.4.22 Priority

Explanation of [Priority]

Optional: Only for solar heating systems with switchover between several tanks

This parameter sets the priority for solar charging of the hot water tank. A high priority means that this tank will be charged by the solar heating system first. A low priority means that it will be charged last.

The priority for the hot water tank is factory-set to [High].

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

7.4.4.23 Circulation runtime

Explanation of [Circulation runtime]

Optional: Only with circulation pump This parameter sets the duration for operation of the

circulation pump after it has been started. This period is only valid inside the set time slot.

After the set period has expired, the circulation pump is switched off for the configurable duration

of the [Circulation pause] parameter.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.4.4.24 Circulation pause

Explanation of [Circulation pause]

Optional: Only with circulation pump

This parameter sets the period (pause) after a circulation pump operating phase. The control system can only restart the circulation pump after this time has elapsed. This pause is only valid inside the set time slot.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Hot water tank

Priority

Circulation

Circulation runtime

Circulation

Circulation pause

Page 43

Operation [Hot water tank] function block

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[Fresh water module] 2 pumps function block Operation

7.5 [Fresh water module] 2 pumps function block

7.5.1 Overview

Overview of the fresh water module (2 pumps)

You can return to the overview by pressing and [FWM].

1 Operating condition 2 Temperature [Buffer top] 3 Temperature [Primary return] 4 Display of hot water uptake 5 Temperature [Hot water] 6 Timer [Stand-by times]

This only appears if the hot water temperature is not set via the potentiometer (option [Target value can be set with rotary knob] is deactivated).

7 Timer [Circulation times]

This only appears if a circulation pump is installed and the [Self-learning] function is deactivated.

Function of the fresh water module

The desired hot water temperature is set with the potentiometer on the fresh water module. If during the configuration option [Target value can be set with rotary knob] is deactivated, the [Stand-by times] timer appears in the overview . With this you can set diff erent time windows and hot water temperatures for every day of the week. Inside these time windows, the upper part of the buf fer is maintained at no lower than the configured hot water temperature. Outside the set time windows, the hot

water is maintained at the lowest configured temperature of the 3 time slots, provided that the buf fer is sufficiently hot.

If a circulation pump is installed for the hot water,

it will be put into operation as "self-learning" by default. This means that the hot water taps of the last 2 weeks are stored. The operating times of the current day will be calculated from this and the circulation pump is started accordingly. If this function is turned off, in the overview the timer [Circulation times] appears for manual setting of the operating times.

After commissioning, no more data is available

for the "self-learning" circulation. That is why an operating period of about 4 weeks is required in the beginning, so that the control system can save sufficient data.

Heat exchanger

The tap symbol next to the heat exchanger is only displayed if the fresh water module is feeding hot water into the water mains. The temperature shown next to this is the temperature of the hot water currently being supplied.

If no hot water is being supplied, the heat exchanger is shown blue all the way through.

Circulation pump in operation

Optional: for [Circulation pump]

The pump symbol next to the heat exchanger appears when the circulation pump for hot water is in operation.

Timer [Stand-by times]

This is only displayed if option [Target value can

be set with rotary knob] is deactivated This timer displays the set charging times of the

current day for charging the hot water tank. These tim e windows are displayed as a black bar in the timer.

Timer [Circulation times]

This only appears if a circulation pump is installed

and the [Self-learning] function is deactivated.

This timer displays the set times of the current day to operate the circulation pump. These time windows are displayed as a black bar in the timer.

Page 45

Operation [Fresh water module] 2 pumps function block

7.5.2 Operating modes

Ready

No hot water is currently being taken.

Working

Hot water is currently being supplied.

Buffer cold

Hot water is being supplied, but the buffer is not hot enough to reach the configured hot wate r temperature.

Primary return too warm

Hot water is being supplied, but the configured hot water temperature is being reduced because the [Primary return] temperature in the heat exchanger of the fresh water module is too high.

Malfunction

There is a fault in a temperature sensor of the fre sh water module.

Circulation

The circulation pump is in operation.

Venting

The controller has found air in the fresh water module and automatic venting is in operation. For this, both pumps are operated at full speed for a short period of time to remove the air from the fresh water module. This can also take place multiple times sequentially.

Emergency operation

The fresh water module is in emergency mode because the admixing pump is defective. Currently , hot water is being delivered but it is only being produced with the buffer pump.

Without the admixing pump, calcification

protection of the heat exchangers it not guaranteed. Protracted emergency mode can therefore calcify the heat exchanger.

Ready (Emergency operation)

The fresh water module is in emergency mode because the admixing pump is defective.

Without the admixing pump, calcification

protection of the heat exchangers it not guaranteed. Protracted emergency mode can therefore calcify the heat exchanger.

7.5.3 Operation

Setting charging times and temperatures of the fresh water module

With the [Stand-by times] timer, you can set different time windows and hot water temperatures for the fresh water module for each day of the week.

Within these time windows, the upper part of the

accumulator tank is maintained at no less than the set hot water temperature. Outside the set time windows, the hot water is maintained at the lowest set temperature of the 3 time windows, provided that the accumulator tank is sufficiently hot.

To set the charging times and t emperatures, tap the overview screen on the [Stand-by times]

timer. A screen

opens.

Fig. 7-13: Overview of hot water charging times

Set the hot water temperature as low as possible

to prevent limescale build-up.

You can find further details about setting the time

window in chapter 7.1.5 "Setting a time window".

Setting circulation times for the circulation pump

With the [Circulation times] timer, you can set 3 different time windows for the circulation tim es of the circulation pump for each day of the week.

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[Fresh water module] 2 pumps function block Operation

To set the circulation times, tap the [Circulation times]

timer in the

overview screen. A screen opens.

Fig. 7-14: Overview of circulation times

Set the circulation times to be as short as possible to ensure good buffer stratification and

prevent limescale build-up.

You can find further details about setting the time window in chapter 7.1.5 "Setting a time window".

7.5.4 Text menu

Adjustable parameters

In function block [FWM], switch to the text menu with the button.

Detailed descriptions of the parameters are provided below.

7.5.4.25 Function Automatic venting

Explanation of [Automatic venting]

This function attempts to remove introduced air from the fresh water module automatically. If the function is activated and the controller detects air intake, both pumps are operated at full speed for a short period of time to remove the air from the fresh water module. This can also take place multiple times sequentially.

This function is activated by default. During venting, the hot water can briefly be hotter than

the target temperature set.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

Hot water

Automatic venting Emergency operation only with buffer

pump

Circulation

Self-learning Circulation runtime Circulation pause

Hot water

Automatic venting

Page 47

Operation [Fresh water module] 2 pumps function block

7.5.4.26 Function Emergency operation only with buffer pump

Explanation of the [Emergency operation only with buffer pump] function

Emergency operation of the fresh water module can be activated with this function if the admixing pump is defective. If it is activated, water heating is only provided by the buffer pump. Without the admixing pump, calcification protection of the heat exchangers is not guaranteed Protracted emergency mode can therefore calcify the heat exchanger.

This function is set to [No] by default.

Modifying parameters

The [Service] access level is required to perform modifications.

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

7.5.4.27 Function Self-learning

Explanation of the [Self-learning] function

With this function, the operating times of the circulation pump of the last 2 weeks are saved. The operating times of the current day are calculated based on this and the circulation pump will be put into operation accordingly.

This function is set to [Yes] at the factory. If [No] is set, the timer appears for manual setting of the

operating times in the overview.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

7.5.4.28 Circulation runtime

Explanation of [Circulation runtime]

Optional: Only with circulation pump This parameter sets the duration for operation of the

circulation pump after it has been started. This period is only valid inside the set time slot.

After the set period has expired, the circulation pump is switched off for the configurable duration

of the [Circulation pause] parameter.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.5.4.29 Circulation pause

Explanation of [Circulation pause]

Optional: Only with circulation pump This parameter sets the period (pause) after a

circulation pump operating phase. The control system can only restart the circulation pump after this time has elapsed. This pause is only valid inside the set time slot.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Hot water

Emergency operation only with buffer pump

Circulation

Self-learning

Circulation

Circulation runtime

Circulation

Circulation pause

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[Heating circuit] function block Operation

7.6 [Heating circuit] function block

7.6.1 Overview

Heating circuit overview screen

Press the button and [HC] to open the heating circuit overview screen. Each heating circuit can be adjusted in its own function block.

1 Operating mode 2 Current room temperature (only with the [Ana logue

RmSensor] or [Digital room sensor] option) 3 Slider 4 [away] button 5 [Auto] button 6 [home] button 7 [Day] button 8 [On/Off] button 9 [Night] button 10 [Holiday] button 11 [Heat times] timer 12 Outside temperature 13 [Flow] temperature

How the heating circuit works

Press [On/Off] to switch the selected heating circuit on or off. If the heating circuit is on, this button lights up green .

With the [Heat times]

timer, you can set 3 different time slots for each day of the week (see page 53). These time slots are displayed as a black bar in the timer.

Press the [Day] , [Auto] or [Night] buttons to swap between the different modes. The selected button then lights up green.

The slider adjusts the flow temperatur e of the heating circuit, and therefore the room temperature.

[Day] mode

Inside a time slot set with the [Heat times] timer, the heating circuit is in [Day] mode.

If a room sensor is installed, in this mode the

heating circuit is set to the highest room temperature configured in the timer for the current day. If there is no room sensor, the heating circuit runs using the [Day] heating curve.

[Night] mode

Outside a time slot set with the [Heat times] timer, the heating circuit is in [Night] mode.

If a room sensor is installed, in this mode the

heating circuit is set to the reduced room temperature [Set-back temperature between time slots:] configured in the timer for the current day. If there is no room sensor, the heating circuit runs using the [Night] heating curve.

[On/Off] button

This button switches the heating circuit on and off. If the heating circuit is in operation, this button appears green .

Automatic mode [Auto]

This button switches the heating circuit to automatic mode [Auto]. Here, the time slot

configured in the [Heat times] timer is used to automatically toggle between the [Day] (inside a time slot) and [Night] (outside a time slot) modes.

The symbol in the button changes depending on whether the heating circuit is currently inside or

outside the configured time slot.

= inside a time slot = outside a time slot

[Day] continuous operation

This button causes the heating circuit to run

continuously in [Day] mode, and the time slots

set in the [Heat times] timer are ignored.

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Operation [Heating circuit] function block

[Night] continuous operation

This button causes the heating circuit to run continuously in [Night] mode, and the time slots set in the [Heat times] timer are ignored.

Current room temperature

Optional: Only with [Analogue RmSensor] or [Digital room sensor].

The installed room sensor displays the current, measured room temper at ur e.

[Flow] temperature

The symbol only appears when the heating circuit is switched on.

The current [Flow] temperature for the heating circuit is displayed.

Slider

The slider adjusts the desired room temperature in the range +/- 5°C. You can increase or reduce the room temperature in increments of 0.5°C using the and buttons.

If a room sensor is installed, when you press the and buttons the target room temperature is displayed instead of the scale.

[Heat times] timer

This timer displays the configured time slot for the [Day] mode of the current day of the week. These time slots are displayed as a black bar in the timer.

[Holiday] mode

This button defines a period of time for switching the selected heating circuit to [Night]

mode. The heating circuit is then switched to the lowest temperature configured in the [Heat times] timer.

[home] mode

This function is only available in [Auto] mode.

This button switches the heating circuit to [Day]

mode until the next configured time slot, ignoring the current set time slot.

Pressing [home] outside a time slot immediately switches the heating circuit to [Day] mode.

Fig. 7-15: Outside a time slot

Pressing [home] inside a time slot causes the next reduced temperature mode to be skipped.

Fig. 7-16: Inside a time slot

[away] mode

This function is only available in [Auto] mode. This button switches the heating circuit to [Night] mode until the next configured time slot,

ignoring the current set time slot. Pressing [away] inside a time slot immediately

switches the heating circuit to [Night] mode until the next time slot begins.

Fig. 7-17: Inside a time slot

Pressing [away] outside a time slot causes the next configured time slot to be skipped.

Fig. 7-18: Outside a time slot

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[Heating circuit] function block Operation

7.6.2 Operating modes

Day on

The heating circuit is inside a time slot configured with the [Heat times] timer.

Night on

The heating circuit is outside a time slot configured with the [Heat times] timer.

Holiday on

The heating circuit is inside a holiday period configured with the [Holiday] button. This mode continues until the end of the configured holiday period.

Enable off

The heating circuit is switched off because the [Boiler] temperature or [Buffer top] is below the required [Enable temperature] temperature.

Day tgt. off

The heating circuit is switched off because the [HeatCurve] temperature calculated on the basis of the [Day] heating curve is either below the room temperature measured by the room se nsor, or below the [Off if HeatCurve below] temperature.

If no room sensor is installed, the heating circuit is switched off because the calculated [HeatCurve] temperature is below the required [Off if HeatCurve below] temperature.

Night tgt. off

The heating circuit is switched off because the [HeatCurve] temperature calculated on the basis of the [Night] heating curve is either below the room temperature measured by the room se nsor, or below the [Off if HeatCurve below] temperature.

If no room sensor is installed, the heating circuit is switched off because the calculated [HeatCurve] temperature is below the required [Off if HeatCurve below] temperature.

H-day tgt. off

The heating circuit is inside a period configured with the [Holiday] button. The heating circuit is switched off because the [HeatCurve] temperature calculated on the basis of the [Night] heating curve is either below the room temperature measured by the room sensor, or below the [Off if HeatCurve below] temperature.

If no room sensor is installed, the heating circuit is switched off because the calculated [HeatCurve] temperature is below the required [Off if HeatCurve below] temperature.

Room day off

The heating circuit is within a time slot, but switched off. The current room temperature is higher than the room temperature configured in the [Heat times] timer.

Room night off

The heating circuit is outside a configured time slot, and switched off. The current room temperature is higher than the room temperature configured in the [Heat times] timer.

H-day room off

The heating circuit is inside a period configured with the [Holiday] button, but switched off. For the current room temperature is higher than the [Set-back temperature between time slots:] temperature configured in the [Heat times] timer.

Day heat. lim. off

The heating circuit is switched off because the current outside temperature is higher than the configured [Day heat. lim.] temperature.

Night heat. lim. off

The heating circuit is switched off because the current outside temperature is higher than the configured [Setback heat limit] temperature.

H-day heat. lim. off

The heating circuit is inside a period configured with the [Holiday] button, but switched off. For the current outside temperature is higher than the [Setback temperature between time slots:] temperature configured in the [Heat times] timer.

Summer off

The heating circuit is switched off with the [On/Off] button. The only active functions are frost protection, and the pumps' anti-blocking protec tio n, which ru ns a t midday every Saturday.

HW off

The heating circuit is switched off for hot water charging.

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Operation [Heating circuit] function block

RoomFreezeProt on

The heating circuit is in operation because the current room temperature is below the [RoomFreezeProtLimit] temperature.

FlowFreezeProt on

The heating circuit is in operation because the current [Flow] temperature is below the [Flow freeze prot. limit] temperature.

ResidHeat on

The heating circuit does not supply any heat and the pump only continues running briefly, to discharge heat from the boiler.

HeatDiss on

The heating circuit is in operation because the boiler is running at overtemperature. The heating circuit is running at maximum temperature [Flow max].

Screed on

The heating circuit is in operation because the screed drying program is running.

Sensor error on

The heating circuit is in operation, even though the flow temperature sensor has a malfunction. It is running at a lower flow temperature to ensure frost protection.

Solar heat diss.

Excess heat is being taken from a buffer that is being charged by a solar heating system.

Locked off

The heating circuit was switched off by an external signal (= "locked").

7.6.3 The heating curve

Description of the heating curve

The heating curve regulates the flow temperature for the heating circuit. Each heating circuit has its own heating curve, as underfloor heating requires different settings from radiators.

The heating curve is defined by the two configu-

rable parameters [Flow at -10°C] and [Flow at +10°C]. The result is a line: the [Day] heating curve. Based on the heating curve, the control system calculates the currently required flow temperature for the heating circuit in [Day] mode, depending on the current outside temperature. For example, an outside temperature of +3°C would result in a flow temperature of 45°C (see diagram below).

If a room sensor is installed for the heating circuit,

the flow temperature calculated on the basis of the heating curve is corrected. The actual flow temperature will then differ from the calculated value.

Fig. 7-19: [Day] heating curve

1 Flow temperature scale 2 Configurable parameter [Flow at -10°C] 3 [Day] heating curve 4 Configurable parameter [Flow at +10°C] 5 Outside temperature scale

The heating curve for [Night] mode is determined by a parallel shift of the [Day] heating curve. This shift is set via the [Set-back] parameter (see page 54).

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[Heating circuit] function block Operation

The flow temperature for [Nigh t] mode is determined on the basis of the outside temperature and the [Night] heating curve.

Fig. 7-20: [Night] heating curve

1[Flow max] 2 [Day] heating curve 3 [Night] heating curve 4 [Day heat. lim.] 5 [Set-back heat limit]

If the current outside temperature exceeds the

configured [Day heat. lim.] temp erature in [Day] mode, the heating circuit is shut off. The same applies to [Night] mode, if the outside temperature exceeds the [Set-back heat limit] temperature. To set these parameters, see page 55.

The [Flow max] parameter determines the

maximum flow temperature for the heating circuit, to protect it from overheating. The factory setting is 45°C for underfloor heating, an d 65 ° C for radiators.

Adjusting the heating curve

If the heating circuit is always too hot or too cold in [Day] mode, you must adjust the heating curve. Do this by adjusting parameters [Flow at -10°C] and [Flow at +10°C].

Only ever make minor adjustments to these

parameters: never more than 2°C for underfloor heating, and 4°C for radiators. You may need to ad apt the heating curve again after a couple of days, but if you do it in small increments, it is more precise and energy efficient.

If the heating circuit is always too hot or too cold in [Day] mode in the transitional period (in spring or autumn), only reduce or increase the [Flow at +10°C] parameter.

Fig. 7-21: Adjusting the heating curve in the transitional

period

1 [Flow at +10°C] If the heating circuit is always too hot or too cold in

[Day] mode in the winter, only reduce or increase the [Flow at -10°C] parameter.

Fig. 7-22: Adjusting the heating curve in the winter

1 [Flow at -10°C]

Page 53

Operation [Heating circuit] function block

You can change the parameters [Flow at -10°C] and [Flow at +10°C] in the text menu of the heating circuit in question, see page 54.

If the heating circuit is always too hot or too cold in [Night] mode, you only have to adjust the [Set-

back] parameter, see page 54.

7.6.4 Operation

Setting heating times and room temperatures

With the [Heat times] timer, you can set 3 different time windows for the heating circuit for each day of the week.

Within a time window, the heating circuit is in [Day] mode. Outside a time window , it is in [Night]

mode.

If a room sensor is installed, the room

temperature can be adjusted within a time window. Likewise, the red uced room temperature [Setback temperature between time slots:] can be adjusted outside the time window for each day of the week.

To set heating times, tap the [Heat times]

timer in the overview

screen. A screen opens.

Fig. 7-23: Overview of heating times if a room sensor is

installed

You can find further details about setting the time

window in chapter 7.1.5 "Setting a time window".

Holiday setting function

When you press the [Holiday] button, you can

define a period during which the selected heating circuit is switched to [Night] mode. The heating circuit is then set to the lowest temperature [Set-back temperature between time slots:] configured in the [Heat times] timer.

To set this function, tap the [Holiday] button in the overview screen.

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[Heating circuit] function block Operation

A settings screen opens:

Fig. 7-24: Setting the start of the holiday

Enter the date and time for the start of the holiday. Press the button to enter the end of the holiday.

Finally, press [Accept] to save your entries. The heating circuits overview screen appears.

7.6.5 Text menu

Adjustable parameters

Select the respective heating circuit [HC], [HC2]... and press the button to switch to the text menu.

Detailed descriptions of the parameters are provided below.

7.6.5.30 Flow at -10°C and Flow at +10°C

Explanation of [Flow at -10°C] and [Flow at +10°C]

The two adjustable parameters [Flow at -10°C] and [Flow at +10°C] are used to define the [Day] heating curve.

Based on the current outside temperature , the control system uses the heating curve to calculate the currently required flow temperature for the heating circuit in [Day] mode.

Modifying parameters

The parameters can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.6.5.31 Set-back

Explanation of [Set-back]

This parameter is used to set the parallel shift of the [Day] heating curve, in order to determine the [Night] heating curve.

Heating circuit

HeatCurve

Flow at -10°C Flow at +10°C Set-back

Day heat. lim. Set-back heat limit Solar heat diss.

Heating circuit

HeatCurve

Flow at -10°C Flow at +10°C

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Operation [Heating circuit] function block

This parameter is factory-set to 3°C for underfloor

heating and 15°C for radiators. Only make minor changes to this parameter, because when walls cool down too much, dramatically higher air temperatures are required to heat the room. Any energy savings will then be lost.

The following figures are a guide, depending on the configured temperature [Flow at -10°C] and the design of the heating circuit:

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.6.5.32 Day heat. lim. and Set-back heat limit

Explanation of [Day heat. lim.] and [Set-back heat limit]

The [Day heat. lim.] and [Set-back heat limit] parameters are used to set outside temperatures at which the selected heating circuit is shut off in [Day] or [Night] mode.

The [Day heat. lim.] parameter is factory-set to

18°C and the [Set-back heat limit] parameter to 2°C.

Modifying parameters

The parameters can be found und er:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.6.5.33 Solar heat diss.

Explanation of [Solar heat diss.]

This parameter defines whether the selected heating circuit may use excess solar heat from the buffer. If this parameter is set to [Yes], this heating circuit takes on the solar excess. The heating circuit switches itself on and a heating curve is calculated as if for an outside temperature of 0°C.

This parameter is factory-set to [No].

You must check the conditions for the [Extra solar heat] function in the text menu of the [Buffer] function block.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Make your selection and press the [Accept] button to save.

Temperature Radiators

Flow at -10°C 40°C 60°C 80°C Set-back 5 - 8°C 10-15°C 15-22°C

Temperature Underfloor heating

Flow at -10°C 30°C 40°C Set-back 3°C 5°C

Heating circuit

HeatCurve

Set-back

Heating circuit

Day heat. lim. Set-back heat limit

Heating circuit

Solar heat diss.

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[Solar] function block Operation

7.7 [Solar] function block

7.7.1 Overview

Versions of solar heating system

Press the button and [Solar] to open the solar heating system overview screen.

The ETAtouch control system is compatible with

a great many versions, for enabling the integration of a solar heating system. The various versions are described below.

Solar heating system in operation

This symbol appears while the solar heating system is in operation and is supplying heat. The displayed temperature is the [Collector] temperature.

If the solar panel is displayed on its own without the lines, the solar heating system is switched off.

Priority of the tank or section

The number of stars indicates the configured priority of the tank or section.

3 stars indicate the highest priority . This tank or section is charged by the solar heating s ystem first. One star denotes the lowest priority, so this tank or section is charged last.

If no stars are displayed, this tank or section is already sufficiently charged.

You can set the priority for each tank or section in

the text menu of the relevant function block. So, for the buffer, use the buffer text menu.

Solar heating system with one tank

Only one tank is shown in the overview screen, regardless of whether the solar heating system is charging the buffer, the hot water tank or a solar tank (e.g., pool). The temperature displayed in the tank is [Buffer b ottom

Solar] for a buffer, [Hot water tank bottom] for a hot water tank and [Current consu mer temp.] for a solar tank.

Fig. 7-25: Solar heating system with one tank

1 Operating condition 2 Current output of the solar heating system (only if

a heat flow meter is installed) 3 Temperature [Collector] 4 Outside temperature 5 Temperature of tank [Tank 1 bottom]

Control system:

The solar heating system is controlled by switching the collector pump on and off. This is switched on as soon as the collector has exceeded the minimum temperature [Collector min] and is warmer by the difference [Switch-on diff.] (factory setting 7 °C) than the tank being charged. The speed of the collector pump is controlled in such a way that the collector supplies a temperature that is higher than the current tank temperature by the configurable offset [Target collector diff.].

When the tank has reached its maximum temperature, or if the collector is only warmer by the offset [Switchoff diff.] (factory setting 5 °C) than the tank, the collector pump is switched off.

The maximum temperature is factory-set to 90 °C for the buffer [Buffer bottom max] and 60 °C for

the hot water tank [Hot water tank max.].

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Operation [Solar] function block

Solar heating system with several tanks

If the solar heating system is charging more than one tank - buffer and hot water tank, for example - these are shown in the overview screen. The lines always lead to the tank that is currently being charged.

Fig. 7-26: Solar heating system with 2 tanks

1 Priority and temperature of the first tank 2 Priority and temperature of the second tank

Fig. 7-27: Solar heating system with 3 tanks

1 Priority and temperature of the first tank 2 Priority and temperature of the second tank 3 Priority and temperature of the third tank (here, the

[Sol. tank] function block)

Switching between tanks:

The collector pump is switched on as soon as the collector has exceeded the minimum temperature

[Collector min] and is warmer by the difference [Switch-on diff.] (factory setting 7°C) than the temperature of the tank with the highest priority.

The sequence for switching from one tank to another is based on the configured priorities. The

tank with the highest priority is charged first. If the solar power is not sufficient for charging the tank

with the highest priority (= collector is only warmer by the difference [Switch-off diff.] (factory setting 5 °C) than the tank currently requiring charging), the tank with the next highest priority is charged after the minimum time has elapsed (factory setting 20 minutes).

If the solar power increases once more, after the minimum time has elapsed solar charging switches back to the tank with the higher priority. This ensures that the tank with the highest priority is always charged first.

Uniform charging of tanks without consideration

of individual priorities is also possible. However, the [Service] permission is required for this. Then you can use the [Changeover if dif f. >] parameter in the solar heating system text men u to c onfig ure the temperature difference between the tanks.

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[Solar] function block Operation

Solar heating system for buffer with 2 coils

In the overview screen, the temperatures and configured priorities of the top and bottom sections are displayed. The collector lines lead to the top or bottom section of the buffer, depending on which section is currently being charged.

Fig. 7-28: Buffer with 2 coils

1 Temperature [Tank 1 top] and priority of top

section

2 Temperature [Tank 1 bottom] and priority of

bottom section

The [Tank 1 top] temperature corresponds to [Buffer top Solar] and temperature [Tank 1

bottom] corresponds to [Buffer bottom Solar].

Stratified charging via the solar heating system:

The purpose of stratified charging is to produce a sufficiently high temperature in the to p part of the buffer, so that the boiler does not have to start up to provide hot water treatment.

A dedicated target temperature [Buffer target solar] is available for controlling stratified charging. You can find this in the buffer text menu under [Buf fer] -> [Buffer top Solar] -> [Buffer target solar]. It is based on the current demand of the consumer or the minimum temperature [Buffer top min. solar].

Stratified charging takes place when the following three conditions are met:

• The boiler is not in operation

• The outside temperature is above 10 °C (factory setting [Min. out. temp. Solar prio.], see page 33)

• Temperature [Tank 1 top] is lower than [Buffer target solar]

The top section has the highest priority by default and is therefore charged first. As long as the [Tank 1 top] temperature is lower than [Buffer target solar], only the top section is charged. If the solar heating system is supplying too little heat, the collector pump is switched off. It is restarted when the collector has exceeded the minimum temperature [Collector min] and is warmer by the difference [Switch-on diff.] (factory setting 7 °C) than [Buffer top Solar].

Once the top section has been charged up to the target temperature [Buffer target solar], solar charg ing takes place in the bottom section. If the [Tank 1 top] temperature falls below the target temperature [Buffer target solar], the top section is charged once more.

The [Buffer top min. solar] parameter is used to

set a minimum temperature for the top section of the buffer, see page 33. This way, solar charging only takes place in the top section once the collector is warmer by the difference [Switch-on diff.] (factory setting 7 °C) than [Buffer top min. solar]. Up until this time, the bottom section of the buffer is charged.

If one of the above conditions is not satisfied, strat ified charging does not take place in the top section, and only the bottom section of the buffer is charged.

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Operation [Solar] function block

Solar heating system with external heat exchanger

Fig. 7-29: Solar heating system with external heat exchanger

1 Current output of the solar heating system (only if

a heat flow meter is installed) 2 Temperature of tank [Tank 1 bottom] 3 Temperature: [Secondary flow] 4 Temperature: [Solar flow] (only if a heat flow meter

is installed) 5 Temperature: [Solar return]

Control system:

The collector pump is switched on as soon as the collector has exceeded the minimum temperature [Collector min] and is warmer by the difference [Switch-on diff.] (factory setting 7 °C) than the tank being charged. The speed of the collector pump is controlled in such a way that the collector supplies a temperature that is higher than the current tank temperature by the configurable offset [Target collector diff.].

If the collector pump is in operation, the

secondary pump starts up. This pump tries to adjust the temperature difference between collector and secondary flow (of the heat exchanger) to the temperature difference between the return o f th e sola r heating system and the tank. This is achieved by changing the speed of the secondary pump.

When the tank has reached its maximum temperature, or if the collector is only warmer by the offset [Switchoff diff.] (factory setting 5 °C) than the tank, the collector pump is switched off.

Solar heating system with external heat exchange r and stratified charging valve

The lines of the heat exchanger always lead to the section of the buffer that is currently being charged. The set priorities are displayed at the section which is currently charged.

Fig. 7-30: External heat exchanger with stratified charging

valve

1 Temperature [Tank 1 top] 2 Temperature [Tank 1 bottom] and priority of

bottom section 3 [Secondary flow] 4 [Solar return]

The [Tank 1 top] temperature corresponds to [Buffer top Solar] and temperature [Tank 1

bottom] corresponds to [Buffer bottom Solar].

Stratified charging via the solar heating system:

The purpose of stratified charging is to produce a sufficiently high temperature in the top part of th e buffer, so that the boiler does not have to start up to prov ide hot water treatment.

A dedicated target temperature [B uffer target solar] is available for controlling stratified charging. You can find this in the buffer text menu under [Buffer] -> [Buffer top Solar] -> [Buffer target solar]. It is based on the current demand of consumers and the minimum temperature [Buffer top min. solar].

Stratified charging takes place when the following three conditions are met:

• The boiler is not in operation

• The outside temperature is above 10 °C (factory

setting [Min. out. temp. Solar prio.], see page 33)

• Temperature [Tank 1 top] is lower than [Buffer

target solar]

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[Solar] function block Operation

The top section has the highest priority by default and is therefore charged first. As lon g as the [Tank 1 top] temperature is lower than [Buffer target solar], only the top section is charged. If the solar heating system is supplying too little heat, the collector pump is switched off. It is restarted when the collector has exceeded the minimum temperature [Collector min] and is warmer by the difference [Switch-on diff.] (factory setting 7 °C) than [Buffer top Solar].

Once the top section has been charged to the ta

rget temperature [Buffer target solar], solar charging takes place in the bottom sectio n. After this, stratified charging is controlled based on the [Secondary flow] temperature. If this is at least 2 °C warmer than [Tank 1 top], the top section of the buffer is charged. If the [Secondary flow] temperature is colder than [Tank 1 top], the bottom section of the buffer is charged.

If the [Tank 1 top] temperature falls below the target temperature [Buffer target solar], the top section is charged once more.

The [Buffer top min. solar] parameter is used to

Solar heating system with two solar panels

Both solar panels are always shown in the overview screen. If the second solar panel is also supplying heat, the lines to the tank are displayed for this panel.

Fig. 7-31: Solar heating system with two solar panels

1 Solar panel 1 2 Solar panel 2

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Operation [Solar] function block

7.7.2 Operating modes

Solar panel temp. too low

The solar heating system is switched off because the solar panel is colder than the temper ature in th e tank. With a buffer, the [Buffer bottom Solar] temperature is compared. With a hot water tank, it is the [Hot water tank bottom] temperature.

Tank charged

The solar heating system is switched off because the connected tanks are completely charged. The buffer has reached the [Buffer bottom max] temperature (factory setting 90°C), or the hot water tank has reached the [Hot water tank max.] temperature (factory setting 60°C).

Solar panel temp. too high

The solar heating system is switched off because the solar panel has exceeded the configured maximum temperature [Collector max] (factory setting 120°C).

Working

The solar heating system is in operation.

Delay

The solar heating system is switched off, but the secondary pump still continues running briefly.

Emer. op.

There is a fault in the [Secondary flow] or [Solar return] temperature sensor. The solar heating system remains in operation, but is controlled only by the temperature of the solar panel.

Malfunction

There is a fault in the solar panel temperature sensor. The solar heating system is therefore switched off.

7.7.3 Text menu

7.7.3.34 Collector min

Explanation [Collector min]

This parameter sets the minimum temperature for starting the solar panel pump. The solar panel pump can only be started once the solar panel has exceede d this temperature.

Do not set this temperature too high, to ensure

that heat can already be supplied to pre-hea t the tank even when there is little sunlight. The ideal range is between 30-50°C. This param eter is factory-set to 30°C.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.7.3.35 Target collector diff.

Explanation [Target collector diff.]

This parameter sets the desired temperature difference between the solar panel and the connected tank (buffer or hot water tank). This temperature difference is controlled by adjusting the speed of the solar panel pump.

This parameter is factory-set to 10°C.

If the buffer is being charged by the solar hea ting

system, the temperature of the solar panel [Collector] is compared with the buffer temperature [Buffer bottom Solar]. If the hot water tank is being charged, the [Hot water tank bottom] temperature is compared.

A high temperature difference results in a low

speed of the solar panel pump. This way, a smaller quantity of water is conveyed through the solar panel. The water remains in the solar panel for a longer time, and therefore produces a higher working temperature in the panel. Consequently, a higher hot water temperature is achieved, but there are also more losses from the solar panel.

State

Collector

Collector min

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[Solar] function block Operation

A low temperatur e difference results in a higher

speed of the solar panel pump. A larger quantit y of water is therefore conveyed through the solar panel. The water remains in the solar panel for a short time, and so also becomes less hot. The working temperature of the solar panel is therefore lower, but there are fewer losses via the solar panel.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

State

Collector pump

Target collector diff.

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Operation [Solar] function block

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[Pellet store] function block Operation

7.8 [Pellet store] function block

7.8.1 Overview

Pellet store overview screen

Press the button and [Store] to open the pellet store overview screen.

This function block is used to control pellet

transport with a discharge screw or a single suction head.

When the pellet store has been filled, you can enter the new stock of pellets by pressing the [Changing the pellet store] button.

1 Operating mode 2 Current pellet stock 3 [Changing the pellet store] button

[Changing the pellet store] button

With this button, you can enter the new stock of pellets after a delivery.

7.8.2 Operating modes

Power supply error

There is a fault in the power supply to the discharge screw.

Self-check

The conveyor drive is performing a self-check.

Ready

The conveyor is not in operation, and there is no demand for fuel.

Off

There is no demand from the boiler.

Start vacuum motor

The boiler is demanding pellets and the suction motor is starting up.

Vacuum motor running

The boiler suction motor is in operation.

Convey

The boiler suction motor and the discharge screw in the pellet store are in operation.

Empty hoses

The discharge screw in the pellet store is switched off but the boiler suction motor continues to run, in order to empty the hoses.

Suction time exceeded

The suction motor has exceeded the maximum fill-up time. Inside this period, not enough pellets were conveyed to the boiler.

Delay due to error

There is a problem with the discharge screw in the pellet store. The boiler suction motor continues to run briefly.

Discharge screw error

There is a fault in the discharge screw in the pellet store, due to overcurrent, heating or insufficient current consumption.

Self-check error

The discharge screw self-check has failed.

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Operation [Pellet store] function block

7.8.3 Operation

Entering the pellet stock

The control system calculates the pellet

consumption on the basis of the boiler stoker parameters, and deducts this from the entered stock value. Actual pellet consumption is not measured, therefore the displayed value may differ from the actual pellet stock by +/- 15%.

Press the button in the overview screen. A screen opens:

Enter the new value and press [Accept] to save.

Entering a minimum level for the pellet stock

You can define a minimum level for the pellet stock so that a warning is issued when the stock goes below that level.

The minimum level is set with the [Warning limit for pellet stock] parameter in the text menu of the pellet stock.

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[Pellet store with switch unit] function block Operation

7.9 [Pellet store with switch unit] function block

7.9.1 Overview

Overview screen of pellet store with switch unit

Press the button and [SwitchUnit] to open the pellet store overview screen.

Up to 4 suction heads can be controlled by one switch unit. Here, only control of 4 suction heads

is dealt with.

1 Operating mode 2 Switch unit 3 [Switching suction heads] button 4 [Changing the pellet store] button 5 Suction heads 6 Current pellet stock

How the switch unit works

The conveying and clear modes are represented by a green line between an enabled suction head and the switch unit.

If a suction head is no longer able to convey pellets, the control system automatically switches to clear mode. Here, the conveying hose now introduces back air, in or der to dislodge any blockages in the conveying hose or suction head.

The switch unit regularly switches between the individual, enabled suction heads, to ensure that the pellet store is emptied uniformly. You can set the maximum number of fill-up operations by a suction head, see page 68.

When the pellet store has been filled, you can enter the new stock of pellets by pressing the [Changing the pellet store] button.

Switch unit positions

The following symbols are displayed, depending on the current position of the switch unit:

Switch unit is changing the suction head

Conveying mode for suction head 1

Clear mode for suction head 1

Conveying mode for suction head 2

Clear mode for suction head 2

Conveying mode for suction head 3

Clear mode for suction head 3

Conveying mode for suction head 4

Clear mode for suction head 4

[Changing the pellet store] button

With this button, you can enter the new stock of pellets after a delivery.

[Switching suction heads] button

If you press this button, the switch unit changes to the next enabled suction head.

[Changing the pellet store] button

With this button, you can enter the new stock of pellets after a delivery.

Enabling and disabling a suction head

If you press this button, the selected suction head is enabled or disabled. If the suction head

is enabled, the symbol appears and pellets can be conveyed from this suction head. If it is disabled, is displayed and the switch unit does not switch to this suction head.

7.9.2 Operating modes

Off

There is no demand from the boiler.

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Operation [Pellet store with switch unit] function block

Ready

The switch unit has reached the position for conveying mode.

Change position

The switch unit is changing its position to another enabled suction head.

Convey

The switch unit is conveying pellets from an enabled suction head to the boiler.

RevFeed

The switch unit has switched to clear mode. Here, the conveying hose now introduces back air, in order to dislodge any blockages in the conveying hose or suction head.

Error fill time

The pellet bin on the boiler could not be filled inside the maximum fill-up time.

Empty

The pellet bin on the boiler could not be filled inside the maximum fill-up time after clearing of all suction heads and subsequent conveying.

Reference

The switch unit is changing the position to the reference point.

Stop

Conveying mode has stopped.

Locked

All suction heads have been disabled. Therefore, conveying mode is not possible.

Vacuum motor delay

Suction stopped due to a malfunction, and the boiler suction motor continues to run briefly.

7.9.3 Operation

Entering the pellet stock

The control system calculates the pellet

Press the button in the overview screen. A screen opens:

Enter the new value and press [Accept] to save.

Entering a minimum level for the pellet stock

You can define a minimum level for the pellet stock so that a warning is issued when the stock goes below that level.

The minimum level is set with the [Warning limit for pellet stock] parameter in the text menu of the pellet stock.

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[Pellet store with switch unit] function block Operation

7.9.4 Text menu

7.9.4.36 Switching at

Explanation of [Switching at]

This parameter sets the maximum number of suction operations of an enabled suction head. When a suction head has reached this number, the switch unit automatically changes to the next enabled suction head.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Conveying system

Switching at

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Operation [Pellet store with switch unit] function block

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[External heat source] function block Operation

7.10 [External heat source] function block

7.10.1 Overview

External heat source overview screen

Press the button and [ExtHeat] to open the external heat source overview screen. Both heat producers the ETA boiler and the external heat source - are always displayed.

1 Operating mode 2 ETA boiler as the heat producer 3 Temperature of ETA boiler [Boiler] 4 Diverter valve (only with option [Diverter valve]) 5 Temperature of external heat source [Ext. heat] 6 External heat source as the heat producer

How the external heat source works

"External heat source" refers to an additional heat producer connected to the heating system.

This can work in one of two ways, depending on how the heating system was installed:

• External heat source with diverter valve:

The boiler or the external heat source can supply heat to the consumers. The switch between the boiler and the external heat source is achieved via a diverter valve.

• External heat source with charging pump:

The external heat source features a separate pump and can convey heat to the buffer together with the boiler.

If the external heat source exceeds the configurable [Switch off boiler at] temperature, the ETA

boiler is switched to [Locked] mode, see page 72.

External heat source with diverter valve

A diverter valve is displayed in the overview screen with a red and a blue line. The red line indicates the heat producer that is currently su pplying heat to the consumers. The blue line indicates the heat producer that is disabled and is not currently supplying any heat.

With the configurable parameter [Enable diverter

valve], you can set the minimum t emper ature for switchover between the ETA boiler and the external heat source, see page 72. If the temperature of the external heat source is below this minimum temperature [Enable diverter valve], the diverter valve switches to the ETA boiler, which then supplies the heat. If this temperature is exceeded, the valve switches to the external heat source, which supplies the heat.

External heat source with charging pump

In the overview screen, the charging pump symbol is displayed for the external heat source, if it is in operation. For an additional return riser mixing valve, the return temperature of the external heat also appears.

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Operation [External heat source] function block

Both heat producers can supply heat to the consumers. The red line indicates the heat producer with the higher temperature.

The charging pump starts up when the external

heat source has exceeded the configurable minimum temperature [Enable temperature]. In addition, the [Ext. heat] temperature must be higher than the temperature of the tank [Tank temperature] plus the configurable difference [Thermostat diff.]. These parameters are configurable, see page 72.

External heat source as the heat producer

The flame in the external heat source is displayed when this heat producer is supplying heat to the consumers. The temperature displayed above is the temperature of the external heat source.

Charging pump

Optional: Only for [Charging pump]

This symbol is displayed when the charging pump of the external heat source is in

operation.

7.10.2 Operating modes

Off

The external heat source is not supplying any heat to the consumers because the temperature of the external heat source is lower than the configured temperature [Switch off boiler at].

Heating

The external heat source is supplying heat to the consumers.

Overtemperature

The temperature of the external heat source has exceeded the configured [Pump safety run] temperature.

Malfunction

There is a fault in a temperature sensor.

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[External heat source] function block Operation

7.10.3 Text menu

Adjustable parameters

In function block [ExtHeat], switch to the text menu with the button.

Detailed descriptions of the parameters are provided below.

7.10.3.37 Switch off boiler at

Explanation of [Switch off boiler at]

This parameter determines at what temperature of the external heat source the ETA boiler switches to [Locked] mode.

If the temperature of the external heat source lies below this temperature [Switch off boiler at], the ETA boiler always supplies the heat. If this temperature is exceeded, the ETA boiler switches to [Locked] mode.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.10.3.38 Enable diverter valve

Explanation of [Enable diverter valve]

Optional: Only with diverter valve This parameter is used to set the minimum

temperature for the switchover between the ETA boiler and the external heat source.

If the temperature of the external heat source is below this minimum temperature, the diverter valve switches to the ETA boiler, which then supplies the heat. If this temperature is exceeded, the valve switches to the external heat source, which supplies the heat.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.10.3.39 Enable temperature

Explanation of [Enable temperature]

Optional: Only with charging pump This parameter sets the minimum temperature of the

external heat source, for starting the charging pump of the external heat source.

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

7.10.3.40 Thermostat diff.

Explanation of [Thermostat diff.]

Optional: Only with charging pump This parameter is used to set the m inimum difference

between the temperature of the external heat source [Ext. heat] and the tank that needs charging [ Tank temperature], to start the charging pump of the external heat source.

Ext. heat

Switch off boiler at Enable diverter valve

Charging pump

Enable temperature Thermostat diff.

Ext. heat

Switch off boiler at

Ext. heat

Enable diverter valve

Charging pump

Enable temperature

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Operation [External heat source] function block

Modifying parameters

The parameter can be found under:

Select the parameter and press the [Change] button. A settings window will open.

Enter the value and press the [Accept] button to save.

Charging pump

Thermostat diff.

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Low-emission operation

8 Low-emission operation

Notes on complying with limit values in Germany after 1 January 2015

In accordance with the provisions of "BImSchV," lower limit values for the emission measurement in Germany apply to all new heating system installations starting 1 January 2015. In particular , com pliance with the new dust limit value of 20 mg/m³ can lead to problems in practice.

It was determined under laboratory conditions in testing centres that the ETA boiler complies with the new limit values. To be fair , however , it should be noted that high-quality fuels were used and the heating system operated under optimal conditions. Things look different in practice. Low-quality fuels are often used, which represents a problem for the dust limit value.

Fuels used for testing

The following fuels were used as test fuel for emission measurements and approval of the boiler:

• Pellets according to ISO 17225-2 with the designation "D06 M10 A0.5"

The ash content of the fuel is an indicator for the dust emission

According to the current state of science, dust emissions from complete combustion are inorganic components in the fuel, so-called aerosol formers. Studies by renowned research institutes have clearly demonstrated that the aeroso l formers present in the fuel (e.g., potassium, calcium, sulphur, chlorine, sodium, zinc, silicon, phosphorous...) are released in relatively fixed proportions. Accordingly, the level of dust emissions is determined by the proportions of these aerosol formers in the fuel.

The situation is made difficult by the fact that the percentage of aerosol formers in the wood depen ds on many factors (tree species, soil condition, season…). Even different parts of the tree (trunk, branches , core/ sapwood) can demonstrate stark fluctuations.

In practice, the ash content of the fuel has proven to be a good indicator of the percentage of aerosol formers. In order to operate the system with the lowest possible dust emissions, a properly maintained condition as well as high-quality fuels with the lowest possible ash content (barks, impurities, leaves, needles...) are indispensable.

Dear customer!

Your boiler is labelled with the "Blauen Engel" to show that it is an environmentally friendly boiler. With this in mind, please note the following for efficient and low-emission operation of your heating system:

1) The installation and adjustment of the heating system must be performed only by qualified and trained personnel.

2) Use only the fuels specified by us in the user manual (in the warranty conditions). This is the only way to ensure low-emission, ec onomical and problem-free operation of your heating system.

3) Perform the maintenance and cleaning procedur es recommended by us on your heating system at regular intervals. In this way, you can ensure that your heating system and its safety features will work effectively to provide efficient and lowemission operation. You can get the best care for your heating system by signing a service contract.

4) Your boiler is adjustable within an output range between 30% and 100% of its rated output. To avoid unnecessary emissions in low-output operation, the systems should be operated as much as possible in the mid to high-output range (adjusted to the heating requirement). Please do not use any heating controller that is separate from the boiler control. Use the heati ng circuit control integrated in the boiler control in combination with a room sensor.

5) From an energy perspective, a buffer storage tank and a combination with a solar heating system are recommended. This ensures efficient and lowemission operation of your heating system.

The Clean Air Act 1993 and Smoke Control Areas

Under the Clean Air Act local authorities may declare the whole or part of the district of the authority to be a smoke control area. It is an offence to emit smoke from a chimney of a building, from a furnace or from any fixed boiler if located in a designated smoke control area. It is also an offence to acquire an "unauthorised fuel" for use within a smoke control area unless it is used in an "exempt" appliance ("exempted" from the controls which generally apply in the smoke control area).

The Secretary of State for Environment, Food and Rural Affairs has powers under the Act to authorise smokeless fuels or exempt appliances for use in smoke control areas in England. In Scotland and Wales this power rests with Ministers in the devolved

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Low-emission operation

administrations for those countr ies. Separate legislation, the Clean Air (Northern Ireland) Order 1981, applies in Northern Ireland. Therefore it is a requirement that fuels burnt or obtained for use in smoke control areas have been "authorised" in Regulations and that appliances used to burn solid fuel in those areas (other than "authorised" fuels) have been exempted by an Order made and signed by the Secretary of State or Minister in the devolved administrations.

The ETA PU 7, 11 and 15 kW boiler has been recommended as suitable for use in smoke control areas when burning wood pellets according to EN 14961-2 class A1, EN plus class A1 or DINplus with a diameter of 6 to 8 mm and a length of 15 to 40 mm.

Further information on the requirements of the Clean Air Act can be found here: http://smokecontrol.defra.gov.uk/

Your local authority is responsible for implementing the Clean Air Act 1993 including designation and supervision of smoke control areas and you can contact them for details of Clean Air Act requirements.

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eta PelletsUnit Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual