eta TWIN 20 kW, TWIN 26 kW, SH20kW, SH40kW, SH30kW Operation

...

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2016-04-02 EN

0000000302 V.001 X.36.0

2303 93412-001

TWIN pellet burner

20-26 kW

Operation

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

Contents

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

1.1 Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Emission measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 Log boiler emission measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 TWIN emission measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Boiler functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Automatic operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6 Suitable fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7 Correct quantity of wood. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

9 ETAtouch controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.1 Getting to know the control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9.1.1 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9.1.2 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

9.1.3 Integrated help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

9.1.4 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9.1.5 Inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9.1.6 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.1.7 meinETA remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.2 [Boiler] function block – log boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.2.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.3 [TWIN] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.3.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.3.2 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.4 [Buffer] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.4.1 Setting the buffer charging times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.4.2 Buffer with solar heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.4.3 Buffer as a combination tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

9.4.4 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

9.5 [Hot water tank] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

9.5.1 Setting the hot water charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.5.2 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.6 [Fresh water module] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

9.6.1 Setting the hot water charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

9.6.2 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

9.7 [Heating circuit] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

9.7.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

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9.7.2 Setting the heating time slots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

9.7.3 The heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.7.4 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

9.8 [Solar] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

9.8.1 Solar heating system with one tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

9.8.2 Solar heating system with 2 tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

9.8.3 Solar heating system for buffer with 2 internal coils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

9.8.4 Solar heating system with external heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9.8.5 Solar heating system with external heat exchanger and stratified charging valve. . . . . . . . . . 69

9.8.6 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.9 [Pellet store] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9.10 [Pellet store with switch unit] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

9.10.1 Text menu - Adjustable parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

10 Regular cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11 Heating value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

12 Low-emission operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

13 Heating water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

13.1 Water hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

13.2 Refilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

General Preface

1 General

1.1 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 thr ough it.

Warranty and guarantee

You should also read the "Conditions for warranty, guarantee, liability" (see 1.3 "

Warranty, guarantee and liability") 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.

Description of log boiler and pellet burner

In addition to descriptions of the TWIN pellet burner, this manual also includes information about start-up, operation, cleaning and maintenance of the log boiler.

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 comp any or by ou r own customer service. In this regard, 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 o perate 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. A LAN cable is required for the connection from the ETAtouch control system to the internet modem.

Details for the remote control can be found in the

manual "Communication platform meinETA". Details for the connection of the LAN cable can be found in the boilers installation manual.

1.2 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 between individual documents regarding delivery scope, the information in our cu rrent price list applies.

Software Description

The software version described in this documentation corresponds to the version valid at the time of publication. The software version installed on your product may differ from that described in this documentation.

A software update to a more recent version can

always be performed. With the appropriate authorisation, the required files can be found at "www.eta.co.at".

Explanation of symbols

Instructions and information

Layout of safety instructions

SIGNAL WORD!

Type and source of danger

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Warranty, guarantee and liability General

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.

1.3 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.

Suitable fuel – logs

The log boiler is suitable for use with wood briquettes and air-dried split logs with no more than 20% water content. Use with unsuitable fuels, especially refuse, coal and coke, and also wet wood, is not permitted.

Suitable fuel

The boiler is suitable for use with wood pellets according to EN 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 agent s, adhe sive s and p ro pellants, or ammonia from cleaning agents, to prevent corrosion of the boiler and chimney.

Permissible water hardness

Water is the intended heat-transfer medium. For special anti-frost 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 minimised to limit limescale build-up in the boiler.

In order to protect the boiler from calcification, the

water hardness of the heating water must be taken into account. Observe the indications outlined in ÖNORM H 5195-1. Details can be found in chapter 13

"Heating water".

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.

Minimum return temperature 60°C

Ensure a minimum return tem perature of 60°C to the boiler.

Install safety valve and thermal relief valve

A safety valve (triggered at 3 bar) as protection ag ainst excess pressure and a thermal relief valve (triggered at 97 °C) to protect against overheating must be installed by the contractor.

Provide a sufficiently large expansion tank or a pressure maintaining device

To prevent air from being drawn in while the system is cooling, the heating system professional must provide a sufficiently large expansion tank or a pressure maintaining device.

General Warranty, guarantee and liability

Open expansion tanks must not be used.

Sufficient power

Operation at lower power than the lowest power specified on the type plate is not permitted.

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 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: Temperature monitoring and control devices, safety temperature limiters, safety valves and thermal discharge valves.

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Log boiler emission measurement Emission measurement

2 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 that could go wrong, 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 12 "

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!

Buffer and boiler must be cold

Before the start of the emission measurement, the buffer and the boiler must have cooled down to ensure heat consumption in the heating system during the emission measurement.

Preferably, the boiler should not be used the night before the emission measurement.

Ensure sufficient heat consumption

Open all radiator valves and turn radiator thermostats to maximum.

2.1 Log boiler emission measurement

Use half-metre split logs

Use half-metre split logs for the emission measurement. Place them as close together as poss ible in the fuel chamber to fill it as completely as possible.

However, keep the burn- through openings in the gr ate free.

Prepare and perform emissions measurement

1. In the log boiler overview, press the [Measure-

ment] button in order to open the emissions measurement settings window.

Fig. 2-1: Settings window for emission measurement

2. By pressing the [Start now] button, the log

boiler will immediately begin preparations for a subsequent measurement after heating up.

Use the [Begin measurement] button to enter the date agreed for chimney sweeping. If the date has been entered, it will appear in the boiler overview.

Fig. 2-2: Set date

In addition, the locking time of the log boiler can be adjusted ( [Lock duration] button). This relates to the set time of the measurement. During this period, a warning notice will appear that no heating operation should be started, so that the heating system has time to cool down. Example: If a time of 17:00 is set for emissions

Emission measurement TWIN emission measurement

measurement and a cool-down time of [Lock duration] 8 h, the warning notice will appear starting at 9:00 .

3. The log boiler must be heated up approximately 2 hours before the measurement in order to reach the permissible operating temperature that is required for measurement.

4. When the log boiler is ready for emissions measurement, a corresponding message will appear on the screen. In addition, a countdown for the emissions measurement will be displayed. The emission measurement is to be carried ou t during this period.

Fig. 2-3: Countdown

No doors on the log boiler may be opened during the emission measurement. Also, do

not stoke the fire in the log boiler.

5. Switch the boiler back to normal mode after the emission measurement. To do this, press the [Deactivate measurement] button in the settings window. If you do not press this button, the boiler will automatically switch back to normal mode after some time.

2.2 TWIN emission measurement

Prepare and perform emissions measurement

1. The pellet burner must be switched on with the On/ Off switch. In the boiler overview, press the [Measurement] button in order to open the emissions measurement settings window.

Fig. 2-4: Settings window for emission measurement

2. Use the [Begin measurement] button to enter the date agreed for chimney sweeping. The pellet burner will then start in time to reach the permissible operating temperature for measurement purposes. By pressing the [Start now] button, the boiler will immediately begin preparations for a subsequent measurement.

In addition, the locking time of the boiler can be adjusted ( [Lock duration] button). This relates to the set time of the measurement. During this period no heating operation will be started, so that the heating system has time to cool down. Example: If a time of 17:00 is set for the emission measurement and at [Lock duration] 8 h, heating will end at 09:00 .

3. If the date has been entered, it will appear in the boiler overview. The boiler will then start in time to reach the permissible operating temperature for measurement purposes.

Fig. 2-5: Set date

4. If the boiler is ready for emissions measurement, a corresponding message will appear on the screen. In addition, a countdown for the emissions

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TWIN emission measurement Emission measurement

measurement will be displayed. The emission measurement is to be carried out during this period.

Fig. 2-6: Countdown

No doors on the log boiler may be opened during the emission measurement. Also, do

not stoke the fire in the log boiler.

Boiler functionality

3 Boiler functionality

1 Pellet suction hose DN50 2 Pellet back air DN50 3 Aspirator for pellet transport 4 Automatic turbulator cleaning 5 Stainless steel combustion chamber 6 Burn-through opening between the pellet burner

and the log boiler's combustion chamber 7 movable, self-cleaning rotating grate 8 detachable ash box 9 Ash screw 10 Stoker screw 11 Rotary valve 12 Metering screw 13 Pellet bin

An aspirator sucks the pellets from the storage room, which may be up to 20 m away, into the pellet bin on the boiler. This pel let bin has a cap acity of up to 60 kg.

The metering screw doses 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 screw pushes the pellets into the pellet burner's 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. For a restart, the p ellets are ignited

with a ceramic igniter. Beneath the grate and the heat exchanger, the ash screws convey the ash to a detachable ash box.

After the stainless steel combustion chamber, the wood gas flame can burn out unhindered through the burn-through opening in the log boiler's combustion chamber. The heat is transferred from the cleanly burned combustion gases to the boiler water in the heat exchanger.

Automatic actuation of the turbulators also cleans the log boiler's heat exchangers.

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Automatic operation

4 Automatic operation

Automatic operation with the pellet burner

If the buffer is empty and the log boiler is not deliverin g any more heat, a green LED on the digital roo m sensor (optional accessory) indicates that fuel replenishment is needed. If no additional logs are added within the selected time (factory setting 10 minutes, see 9.3.2.1

"Start lag" for adjustment) the pellet burner will start au-

tomatically and take care of heating. Therefore, it is not necessary to manually switch between log and pellet modes.

If the insulating door of the log boiler stays open

longer than 1 minute, the ETAtouch control system will automatically switch the pellet burner off on the assumption that the log boiler will be started.

When the insulation door is opened, the draught fan starts and a message appears on the display. However, if no logs are added and ignited, the draught fan will switch back off after 30 minutes. Then the ETAtouch control system will restart the pellet burner as needed.

If no logs are added, the log boiler can also be

switched off in its function block with th e switch after the log boiler's insulation door has been closed. The waiting period of 30 minutes will then be skipped and the control system can start the pellet burner immediately.

Only add wood if the log boiler will immediately take over heating operations.

WARNING!

Wood may only be added to the log boiler if it will then be heated up, i.e. take over heating operations.

Otherwise, if the pellet burner is switched on, there is a risk that it will switch on when there is a request from the buffer. The flames cause the wood to release gas. This gas will not be fully combusted and can lead to tar build-up in the boiler and explosions.

Buffer switch on/off temperatures

In the buffer's function block you can set a minimum temperature for the upper buffer section (=[Buffer top min.], see 9.4.4.1 "

Buffer top min.") which the buffer

storage tank will maintain. There is also a switch-off temperature (=[Buffer bottom off], see 9. 4.4.2 "

Buffer bottom off") which specifies when the boiler stops

charging the buffer.

The buffer's adjustable charging times (see 9.4.1

"Setting the buffer charging times") define when the

buffer can request heat from the boiler. If the log boiler does not supply this heat, the pellet burner will be started.

In other words, if temperature [Buffer top min.] or function [Full buffer charge with pellets] are set to [Yes], the buffer will be kept at temperature continually and the charging status will be correspondingly high.

Therefore, for heating mode with the log boiler,

the charging status of the buff er must be checked before heating up. The addition of too much wood must be avoided to prevent overhea ting. The correct amount of wood is indicated in table 7 "

Correct quantity

of wood".

Safety General information

5 Safety

5.1 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.

Persons who lack experience and knowledge as well as children may not operate, clean, or maintain the product.

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.

5.2 Safety devices

Pump safety run, automatic heat dissipation at overtemperature

If the boiler temperature exceeds 87 °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 risin g further and triggering further safety devices such as the safety temperature limiter and the thermal relief valve.

Heat dissipation is limited by the selected maximum flow temperature in the heating circuits

and the target hot water temperature.

Boiler overheating

If a boiler temperature of 90°C is reached, the control system switches the draught fan off and a warning message appears on the display.

Reasons for a boiler temperature increase include:

• too much wood in the fuel chamber

• heating circuits unexpectedly switched off

• heating pump failed

• heating line inadvertently shut off Once the boiler temperature has fallen below

86°C, heating resumes automatically. During such emergency shutdowns the wood

continues to emit gas and the unburned wood

gas causes tar deposits in the boiler and chimney.

Install thermal emergency cooling valve against overheating

The safety heat exchanger built into the boiler must be connected by the heating technician to the house's cold water supply via a thermal relief valve (opening temperature 97 °C) to protect the boiler against overheating if the pump fails. The minimum pressure in the cold water pipe must be 2 bar.

Fig. 5-1: Thermal emergency cooling valve

1 Cold water connection 2 Isolating valve; remove hand wheel 3 Strainer 4 Thermal emergency cooling valve 5 Visible outlet to sewer

The cold water supply must be connected to the upper connector of the safety heat exchanger; the lower connector serves as an outlet to the sewer. T o pre vent the supply line from being shut off accidentally, remove the levers from shut-off valves or th e hand wheels from valves and hang them there with a piece of wire.

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Safety devices Safety

The discharge must have an easily visible flow path so malfunctions can be recognised. Direct the discharged water to the sewer via a siphon funnel or at least with a pipe into the ground so that nobody can be scalded if the valve is activated.

Even for cold water coming from a domestic well with its own pump, a thermal emergency cooling valve mu st be installed on the boiler. With a generously dimensioned air vessel, enough water for cooling will come even if there is a power fa ilure. If the electricity supply is very uncertain, a dedicated air vessel for the thermal emergency cooling valve is required.

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, it blocks the draught fan so that it can no longer be switched on. When the boiler temperature decreases below 70°C again, the safety temperature limiter can be manually released for a restart of the boiler.

Install safety valve against overpressure

A safety valve with 3 bar opening pressure must be installed on the boiler. No shut-off valve may be installed between the boiler and the safety valve. If solar or other heat sources provide energy to the buf fer storage tank via a heat exchanger, a safety valve (3 bar maximum) is also required on the buffer storage tank.

Fig. 5-2: Safety valve

Normally an expansion tank that is too small or defective, or blocked heating lines, are the cause for activation of the safety valve. The safety valve should be installed at the highest point of the heat producer or i n the flow pipe close to the heat producer.

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

Suitable fuels

6 Suitable fuels

Suitable fuel

The firewood must be air-dry, i.e. it must have dried for at least one year and have a water content unde r 20%. We recommend using half-metre split logs with an average diameter of 10 cm.

Do not split round logs with a diameter under 8 cm; instead place them between the split logs in the middle.

Boards may only be added between the logs and in no case should they be included in the first layer as they would block the burn-through opening in the gra te .

Small pieces of fuel may only be burned as a minor addition placed among the split logs, but never in the bottom layer. The smaller the pieces, the less of them may be added.

Wood briquettes measuring 6 cm to 10 cm in diameter in compliance with ISO 17225-3:2014.

Only 1 oversized split log or 1 stump piece can be placed in the top layer, but no more. Complete

burning may require 2 combustion phases.

Unsuitable fuel

Wet fuel with a moisture content in excess of 20% may not be burned as it results in condensation which can lead to corrosion of the boiler's fuel chamber walls.

The following also may not be burned: rubbish, paper and cardboard (only for start-up), wood dust from sanding, sawdust, pieces of wood smaller than thumbsized, coal and coke, and fuels generally prohibited by local air quality regulations, such as old railway sleepers, plastic-coated plywood, impregnated wood, etc.

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Correct quantity of wood

7 Correct quantity of wood

When not much heating is needed only place a small amount of wood in the boiler

Absorbing all the heat from a boiler fully loaded with wood would require buffer storage tanks larger than needed for winter operation and also la rger than those normally installed.

When less heat is required, i.e. for hot water in the summer, or during the evening shortly before the night set-back, only load the boiler with the amount of wood actually needed.

The table below displays the amount of wood n eeded for summer operation for different boiler sizes (= fuel chamber capacity), wood type, buffer volume and buffer charging status. Bear in mind that a "buffer top" temperature sensor that is installed too low reduces the usable volume.

If the living space already needs some heating, start with the amount of wood indicated in the table below. To establish the correct amount, approach the fully

charged buffer state slowly, adding one or two more logs every heating cycle. If too much wood is loaded, an emergency shutdown of the boiler will occur. If the boiler overheats, the flow of air is stopped. The fire will go out, but the hot wood will continue to smoulder for a while and the unburned wood gas resulting from the lack of air can create tar deposits in the boiler and flue. If this occurs often, the boiler's heat exchanger will become clogged with tar.

Observe the energy density of the fuel. The

energy content of 50 litres of wood briquettes corresponds to 100 litres of beech wood or 150 litres of spruce.

The current buffer charging status is displayed in

the control system in the boiler and buffer overviews. It is shown in percent and is the average of the three buffer temperatures (top, middle, bottom) between 30°C (=0%) and 80°C (=100%).

SH20 / SH30 Buffer charging status SH40 / SH50 / SH60

Maximum fuel load Size of buffer storage tank (litres) Maximum fuel load

Briquette

Beech Spruce 3300 2200 1650 1100

Briquette

Beech Spruce

90% 85% 80% 70% 85% 78% 70% 55%

1/4 80% 70% 60% 40%

1/4 75% 63% 50% 25% 1/4

70% 55% 40% 10%

1/2 65% 48% 30% 0%

60% 40% 20% 1/8 1/4 55% 33% 10%

1/4 1/2 3/4 50% 25% 0% 1/2

45% 18% 40% 10%

4/4 35% 0%

30%

3/4 25% 1/4 1/2 3/4

20% 15% 10%

1/2 4/4 0% 4/4

Start-up

8 Start-up

Check heating system's water pressure

In buildings with up to three storeys, the optimum

water pressure in a cold heating system is between 1 and 2 bar. For a warm heating system, the optimum water pressure is between 1.5 and 2.5 bar.

If the water pressure is too low, fill the cold heating system to approx. 2 bar. Do not fill to a higher pressure, as water expands with increasing temperature and the water pressure also rise s when the boiler is heating. The safety valve triggers at approx. 2.8 bar.

Open heating lines

If the system is new or has been out of operation for some time, verify whether the return riser mixing valve is in the "AUTO" position and all shut-off valves in the heating lines are open.

Always keep ball valves completely open to avoid ruining the seals. Open valves by turning anticlockwise, and then turn back 1/4 turn from the fully open position to relieve pressure on the valve stem.

Check buffer charging status

Before starting the boiler, check the current buffer charging status to avoid adding too much wood.

The table on page 16

shows how much wood should be added. The buffer charging status is shown in the boiler overview.

Pay particular attention to the different energy densities of the fuels and the lower heat

consumption in summer.

Open insulation door, draught fan starts automatically

When the insulating door is opened, the draught fan starts automatically and the switch changes to the

setting. The operating condition changes from [Ready] to [Insulation door open]. The open insulation door is shown on the display.

If the draught fan does not start, there is either a fault or an alarm. Therefore check the messages

on the screen.

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Start-up

Open fuel chamber door

The draught fan must be running before the fuel chamber door is opened so that any combustion gas can be extracted from the fuel chamber.

1 Fuel chamber door 2 Ignition door 3 Combustion chamber door

If the boiler has not safely cooled, no boiler doors

may be opened without an operating draught fan. A sudden inflow of air in the presence of smouldering wood may result in an explosion.

The fuel chamber door is always closed during

both start-up and heating operation. It is opened only when ash is removed from the boiler.

Check fuel chamber

Use the poker to distribute ashes and charcoal evenly throughout the fuel chamber. In the panels, the two upper openings for primary air must be free.

Also, the 3 burn-through openings in the grate must stay open so that the fire reaches the combustion chamber during ignition.

Place logs close together in fuel chamber

Add the required amount of closely spaced logs to the fuel chamber. Stack the logs instead of throwing them in at random. Always place the first layer of logs lengthwise.

1 Half-metre logs 2 33 cm logs

Adjust log over burn-through opening

Lift the bottom log above the burn-through opening with the poker and place pieces of charcoal (from the fuel chamber) or small pieces of wood under it so that the burn-through openings in the grate remain clear . To

Start-up

make ignition easier, ne xt to the log on the left and right there should be a small gap separating it from the neighbouring logs.

Place only one oversized log on top

Only one oversized split log or one stump piece can be placed in the top layers, but no more. Two combustion phases may be needed for complete burning.

Brushwood, coarse wood chips, unsplit logs and untreated wood waste should be added only as a secondary fuel among the split logs

First place half of the required amount of logs in the fuel chamber (at least 3 layers). Then alternately add the secondary fuel (brushwood, coarse wood chips, round logs, wood waste) and additional logs.

The smaller the pieces of secondary fuel are, the more logs must be added between them.

Under no circumstances should secondary fuel

(brushwood, coarse wood chips, round logs, wood waste) be used for the bottom layer. Such fine material burns too quickly, resulting in incomplete combustion in the combustion chamber, which is still cold during start-up. As a result, tar can build up in the heat exchanger.

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Start-up

Close fuel chamber door, open ignition door

Close the fuel chamber door and then open the ignition door.

If the boiler will not be started up yet, close both doors and, in the boiler overview, switch off the

boiler using the switch.

Ignite fire with cardboard and newspaper

Place crumpled paper or a few pieces of cardboard in front of the first layer of wood and ignite it. Th e draught fan sucks the flame over the tightly stacked logs, causing them to ignite more quickly . For heavy , smooth hardwood, larger pieces of kindling may be needed for ignition.

CAUTION!

Never use petrol, turpentine o r si milar materia ls as an "ignition aid": risk of explosion!

The ignition door should be kept open after

ignition to monitor the progress of the fire. It should only be closed once the boiler's exhaust temperature has reached 100 °C.

How long it takes the fire to start depends on the type of wood used; rough spruce may need only 2minutes, smooth beech may require 5 minutes until the exhaust gas temperature reaches 100°C.

At 100°C exhaust temperature, close ignition door and insulating door

Once a few logs are burning well and the exhaust temperature is over 100°C, close the ignition door and the insulating door.

Fig. 8-1: Close ignition door

Start-up

Fig. 8-2: Close insulation door

The exhaust temperature is displayed in the boiler overview. At over 100°C, an arrow appears to indicate that the ignition door should be closed.

When the insulating door is closed, the boiler automatically switches to [Ignition] mode and, once the residual oxygen content is below 15%, to [Heating] mode. The boiler is now in heating mode and regulates the combustion of the wood independently.

Avoid opening boiler doors unnecessarily

Avoid opening the insulating door and the fuel chamber door unnecessarily in [Heating] status. That disrupts the boiler control and increases fuel consumption. Also keep the ignition door and the combustion chamber door closed.

CAUTION!

 Never open the insulating door and the fuel

chamber door when the boiler is in [Calibrating lambda probe] or [Overtemperature] status.

Completion of heating mode with ember burnout

Once the wood in the boiler has been burned (residu al oxygen content above 15% for more than 5 minutes) o r the exhaust temperature falls below 80 °C, the boiler automatically starts the ember burnout ([Ember burnout] status).

If the [Ember burnout] button was not

pressed, the boiler will flush the secondary air ducts with air in order to free them of dust. Charcoal and embers remain in the boiler by design so that newly added wood can be ignited more easily.

Complete ember burnout for cleaning

To clean after the final heating operation, press the [Ember burnout] button in the log boiler overview (the button will then turn yellow ). Ember retention is then deactivated and the boiler performs a complete ember burnout (duration approx. 1 hour). burning most of the charcoal in the fuel chamber to make subsequent cleaning of the boiler easier.

Adding fuel

You should only add fuel when the buffer

charging status is below 30% and the fuel chamber has burned to empty.

If wood has been added and there are still embers in the boiler, it automatically tries to ignite the wood again. If the wood is hard to ignite and there are only a few remaining embers, it may help to push the charcoal together in the middle before refilling. If the remaining embers do not ignite the wood, light it with paper and cardboard through the ignition door.

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Getting to know the control system ETAtouch controller

9 ETAtouch controller

9.1 Getting to know the control system

Get to know the control system

Take your time and read the following chapter carefully. It describes the functions and settings of the ETAtouch control for your heating system. If you are familiar with these, it will be easier for you to make adjustements, even without consulting the manual.

Design of the control system

The individual components of the heating system, e.g. buffer, hot water tank or heating circuit are shown in the control system as "function blocks". These are

listed in the uppermost row on the screen. The respective user interface is opened with a single tap of the finger.

Fig. 9-1: ETAtouch control system function blocks

1 Currently selected function block 2 Other function blocks, e.g. hot water tank, heating

circuit, solar heating system

3 Scroll to other function blocks (displayed if not all

function blocks can be displayed simultaneously)

4 Help button. Details can be found in chapter 9.1.3

"Integrated help".

5 Settings of the selected function block 6 Date and time 7 Current outside temperature 8 Status of the remote control for the boiler (via

www.meinETA.at), see chapter 9.1.7 "

meinETA

remote control"

9 System configuration

ETAtouch controller Getting to know the control system

Several views are available for each function block. To switch between these, tap on the symbol at the top left. The selection of views appears.

Fig. 9-2: Selection of views

1 User interface 2Text menu 3 Inputs and outputs menu 4 Messages menu

In the user interface, you can set the most important and common settings. For example,

adjustment of the charging times, heating times, room temperatures and operating modes are contained in this list. Details can be found in chapter

9.1.1 "

User interface".

The parameters of a function block are

displayed in the text menu and can be

adjusted,if necessary, see chapter 9.1.2 "

Text

menu".

The terminal assignment of individual

components, such as temperature sensors,

pumps and mixers, are visible within the input and output menu, where they can be changed if required. Also, for example, pump s an d mixers can b e started in manual mode. This menu is intended for specialists only. Details can be found in chapter 9.1.5

"Inputs and outputs".

Any hints, errors or faults are displayed in the

messages menu, see chapter 9.1.4

"Messages".

9.1.1 User interface

The user interface

The user interface is always displayed by default. If you are in a different view, switch to the user view by tapping the symbol (upper left) and then selecting .

In the user interface, you can set the most important and common settings. The display is dependent on the selected function block. The illustrated example shows the user interface of a heating circuit with a room sensor.

Fig. 9-3: Heating circuit user interface

1 Operating condition and information 2 Producer for the heating circuit.

Currently , the buffe r provides a flow temperature of 65 °C to the heating circuit.

3 On/Off switch for the heating circuit

= switched on

= switched off 4 Increase or decrease the room temperature 5 Function block settings.

In this menu, the settings and functions most commonly used can be stored. For the heating circuit, for example, the heating times and the heating curve are adjusted here.

6 Graphic display of the heating times and room tem-

peratures settings

7 Different operating modes of the heating circuit

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Getting to know the control system ETAtouch controller

9.1.2 Text menu

Adjust parameters in the text menu

To enter the text menu, tap in the upper left on the

symbol, followed by . In the text menu, the required parameters for the control system of the function block are listed. Modifiable parameters are indicated by the symbol.

Fig. 9-4: Text menu

1 Parameter 2 Current value or setting 3 Editable parameter

Changing a parameter is simple. Select this and tap the symbol. The settings window appears.

Fig. 9-5: Settings window

1 Factory setting and adjustment range 2 Reset to factory setting 3 Save and close 4 Cancel and close

The default setting and the setting range are displayed on the right side. The new value is entered with the keypad, and stored by pressing the [Save] button. Resetting to factory settings is done by pressing the [Factory settings] button. To cancel and close the window, tap the arrow on the left side of the screen.

Only modify parameters whose function you're

familiar with. Before making any changes, read the relevant section of the user manual or configuration manual, or open the integrated help feature. If yo u cannot find sufficient information about a parameter, please consult a specialist.

Commonly used parameters can be found in the settings

Commonly used parameters can be found in the

function block settings ( button). There, the parameters are identified by the symbol and can be adjusted by tapping. This saves you having to search through the text menu for these parameters.

9.1.3 Integrated help

How to use the integrated help

Use the integrated help to find information. This appears when the button is pressed. If help is activated, annotations will appear in the user interface in blue boxes.

Fig. 9-6: Activated help in the user interface

ETAtouch controller Getting to know the control system

Fields with additional line symbols on the right

side (example: ) indicate that further information is available. Tap on the appropriate field and a window with the description will open. Close the window using the arrow on the left side.

Fig. 9-7: Description

The help function can also be accessed via the text menu. A detailed description is available for all the parameters displayed in blue writing. Just tap on a parameter and a window will open with the description.

Fig. 9-8: Activate help in the text menu

To disable help, press the button again.

9.1.4 M essages

An error message appears

If an error occurs, a symbol of the type of error appears in the corresponding function block. This symbol is also displayed at the bottom of the screen.

Fig. 9-9: Symbols when an error occurs

Types of errors and their meaning

• Notification A notification does not interrupt operation, and therefore no acknowledgement is requir ed. Notifications inform the user, for example, that pump anti-blocking protection has been activated.

• Warning A warning is displayed on failure of a function which 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.

• Malfunction or 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. Other errors and alarms can only be acknowledged after the cause has successfully been remedied. Once an error or alarm has been resolved and acknowledged, you must restart the boiler or the affected function block.

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Getting to know the control system ETAtouch controller

If the error symbol at the bottom of the screen is tapped, a window appears. In this, the function b lock in which the error occurred will be displayed.

Fig. 9-10: Display of the function blocks in which the error

occurred

If the function block is selected, the view changes to the messages menu. By tapping the error, the error description is displayed.

Fig. 9-11: Error description

To acknowledge, press the [Acknowledge] button. Depending on the nature of the fault, this either remains visible or disappears.

You can also switch to the messages menu to display any errors. Just tap on the

symbol and then select .

9.1.5 Inputs and outputs

See terminal assignment of individual components

The terminal assignments of the individual components of the selected function block are displayed in the inputs and outputs menu, e.g. pumps, temperature sensors, and mixers.

When authorization is given, the terminal assignment can be changed. Also, manual mode

for, e.g. a pump or a mixer, is possible. Below is an example of the function block of the

heating circuit. To view the terminal assignment, first select the heating circuit. To access the inputs and outputs menu, tap on the symbol, followed by

. An overview screen opens.

Fig. 9-12: Overview

Details of a component, such as the current situation or the operating state, are displayed when the symbol is tapped. Try this with the heating circuit mixing valve. A settings window appears.

Fig. 9-13: Settings window

With the appropriate authorization, the heating

circuit mixing valve can be manually put into operation in the settings window using the [Forward], [Back] and [Stop] buttons. However, this is primarily intended for specialists.

Close the settings window using the arrow on the left side.

ETAtouch controller Getting to know the control system

9.1.6 Getting started

9.1.6.1 System settings

Open the system configuration

By tapping the symbol (in the lower left of the screen), the system settings menu opens.

Fig. 9-14: Open the system configuration

In the system settings, among other things, the date and time is set, the language of the control system is set, and access to the remote "meinETA" system is activated.

With corresponding authorisation, the software for the ETAtouch control system is updated in this menu.

Fig. 9-15: System configuration menu

To close the system settings, simply tap the symbol again.

9.1.6.2 Setting the language

Change the language using the ETAtouch control system

The language used can be changed using the ETAtouch control system For this, open the system preferences and tap the [Language] symbol. A settings window appears.

Fig. 9-16: Setting the language

Select the desired language. Following this, the ETAtouch control system will appear in the chosen language.

9.1.6.3 Setting the date and time

Setting the date and time

The date and time can be adjusted to the respective time zone. The date and time are factory-set to Central European Time (UTC+01:00). For setting on the screen, tap the date or time. A settings window appears.

Fig. 9-17: Date and time

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Getting to know the control system ETAtouch controller

Using the arrow keys, set the time. Tap on the date field to open the calendar. Press the [Save] button to save. Subsequently , the system settings ar e closed by tapping the symbol.

9.1.6.4 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.

Be sure to keep the name short. This improves the clarity of the screen.

To change a name, first open the desired function block settings using the [Settings] button. Below the hot water tank function block is explained.

Fig. 9-18: Function block settings

An overview of the setting options appears. These depend on the function block and can vary in number.

Fig. 9-19: Overview of the settings menu

To change the name, tap on the [Change name] symbol. An on-screen keyboard appears in order to enter the new name.

Fig. 9-20: On-screen keyboard

Press the [Save] button to save. To cancel, close the window using the arrow on the left side.

9.1.6.5 Switch between function blocks

The principle of "producers" and "consumers"

In the user interface, the "producer" of the function block and (if present) also the "consumer(s)" are displayed. Producers are those components of the heating system that produce heat, for example the boiler or the buffer. Consumers are those components which absorb the heat, for example the heating circuit or the hot water tank.

The principle of "producers" and "consumers" are explained using the example of the buffer below. The buffer is charged by the boiler. The boiler is a "producer" for the buffer, and the buffer is a "consumer" of the boiler. The heating circuit and the hot water tank are connected to the buffer. Thus, the buffer is a producer for the two consumers, namely the heating circuit and the hot water tank.

ETAtouch controller Getting to know the control system

In the user interface, producers f or the function block are always displayed on the left side and

consumers on the right side.

Fig. 9-21: Consumers and producers in the overview

1 Producers (in this example the boiler) 2 Consumers (e.g. heating circuit, hot water tank)

These symbols are also used to navigate. For

example, tapping the symbol of the producer ( )switches to its function block. The same works with the symbol of the consumer ( ). If several producers or consumers are present, a selection window appears.

Fig. 9-22: Selection window

The symbols for both producers and consumers

vary between the function blocks.

9.1.6.6 Setting a time window

Setting the charging and operation times

In some function blocks, the time window for charging the tank (for example the buff er and hot water t ank), or the operating times (for example for the heating circuit) are set. This time window must be created in the settings of the respective function block.

Subsequently, the setting of the charging times

and temperatures will be described in relation to the hot water tank. This example applies accordingly to other function blocks.

Open the overview of the time window settings

1. Open the settings for the function block with the

[Settings] button.

Fig. 9-23: Open the settings

2. Access the charge times of a particular day with

the [Charging times Daily plan] button.

Fig. 9-24: Access charging times

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Getting to know the control system ETAtouch controller

3. An overview screen opens.

Fig. 9-25: Overview

1 Selected time window (charging times or operating

times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window

setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable target temperature.

This is dependent on the function block, and, in this

example, corresponds to a hot water temperature

of 55 °C. 8 Period of the time window.

In this example, the hot water is charged between

08:00 a.m. and 8:00 p.m. to 55 °C. 9 Set-back temperature.

Outside the time window, the hot water is charged

to this set temperature.

Setting the time window is described below.

Setting the charging times

1. In the overview, select the charge time. In each field, use the arrow keys ( , ) to set the time and temperature.

Fig. 9-26: Setting time slot and temperature

In this example, the hot water is charged between 08:00 a.m. and 8:00 p.m. to 55 °C

2. If an additional time window is necessary, add it using the button. Adjust as described above.

A maximum of 3 time windows can be set. To delete an unnecessary time window, press

the button in the selected time window.

3. For the period outside of the set charging times, a reduced temperature can be set. To adjust the settings, select the [Set-back temperature outside the time window] field and use the arrow keys to select the desired temperature.

Fig. 9-27: Reduced operation temperature settings

In this example, the desired hot water temperature outside the charging times is 30 °C.

When loading times and temperatures of a day of the week have been set, they can be copied to other days of the week.

Copying time windows

In the following example, the time windows from Wednesday are copied to Saturday and Sunday.

ETAtouch controller Getting to know the control system

Time windows from Wednesday copied to Saturday and Sunday.

1. In the overview, press the [Weekly plan] button to switch to view all days of the week.

Fig. 9-28: Copying time windows to days of the week

2. This opens an overview of time windows for all days of the week. First, choose the day of the week to copy (this is framed) and then press the [Copy selected day] button.

Fig. 9-29: Overview

3. Now, select the days of the week for which the time window is to be copied. In this example Saturday and Sunday.

Fig. 9-30: Select days of the week

Pressing the [Mark all days] button marks all days.

4. Press the [Save] button to save. The overview will be updated accordingly. Close the window using the arrow on the left side.

You can also access the week overview via t he

function block settings ( button). For this, press the [Charging times Weekly plan] button in the settings.

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Getting to know the control system ETAtouch controller

9.1.7 meinETA remote control

Remote control of the boiler via the internet

All boilers with the ETAtouch control system can be controlled remotely via smartphone, tablet or PC. The boiler's touch screen is connected to the Internet via a network cable.

A LAN socket near the boiler is required for the internet connection. If none are available, an internet connection can be established using a dLAN adapter via the in-house power grid. This dLAN adapter is also available from ETA.

Fig. 9-31: dLAN network

Worldwide access via www.meinETA.at

Remote control via the free internet platform www.meinETA.at. After registering on this platform, the boiler can be controlled remotely. It can be accessed by smartphone, tablet or PC and is, of course, protected by username and password. You can also access the boiler's control system via your home network with a free VNC Viewer . To see how remote operation of your boiler works, please visit www.meinETA.at.

Enter access data for the boiler remote control

After receiving your login information (after registering on "www.meinETA.at"), enter it on the control panel in the [meinETA Access] menu. This enables access to remote control of the boiler.

To enter the login information, open the control panel ( symbol, bottom left). By tapping the [meinETA Access] symbol, a settings window appears.

Fig. 9-32: Enter the access data.

In the upper part of the screen, it is shown whether an internet connection is present. If there

is no connection, one must be established. Enter the login information and the identification plate

number of the boiler (if this is not displayed) in the relevant fields. Do this by pressing the symbol. An on-screen keyboard opens.

Fig. 9-33: On-screen keyboard

To finish, press the [Register now] button. Activation is performed (if an internet connection is available). If this is successful, the symbol for the remote control

ETAtouch controller Getting to know the control system

appears at the bottom of the screen. If an error is displayed, check the access data and the internet connection.

Fig. 9-34: Settings window for remote control

After successful activation, options appear for remote control in the settings window. This is switched on or off using the selector switch ( ):

• [Start local VNC service IP address: ]: You can also access this via the free VNC Viewer on your boiler.

• [Send messages to meinETA server]: Messages are then also displayed on the p latform "www.meinETA.at".

• [Establish a meinETA connection]: Permit or block remote control via the platform "www.meinETA.at". If this option is turned off, the remote control is also switched off and therefore the boiler is not visible on "www.meinETA.at". The symbol of the remote control changes to .

• [Full access]: Thus, access is cut off remotely, but the control system still remains visible on "www.meinETA.at". The symbol of the remote control changes to . Changes to the control system can only be performed on-site. This is to ensure that no changes can be remotely performed on your control system.

You can change the options at any time by pressing the remote control symbol at the bottom

of the screen.

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[Boiler] function block – log boiler ETAtouch controller

9.2 [Boiler] function block – log boiler

Boiler overview

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button. 2 Buffer charging status 3 Exhaust temperature 4 Residual oxygen content of flue gas 5 Boiler consumers

If a consumer is being charged (in this example the buffer), a line appears and the flow temperature and the symbol of the consumer are shown in yellow.

6 Switch off boiler.

This switch is used only to switch off the boiler when it is not heated. The boiler is automatically switched on by opening the insulation door.

7 [Ember burnout] button.

Thus, ember retention is deactivated and the boiler performs a complete burnout.

8 [Measurement] button.

The menu for emission measurement of the boiler is opened.

9 [Settings] button.

In this menu, the settings and functions most

commonly used can be stored. 10 Flow temperature and return temperature 11 Producer for the boiler (TWIN pellet burner)

Displayed only if a TWIN pellet burner is addition-

ally installed.

Boiler functionality

When the insulating door is opened, the draught fan starts automatically and the switch changes to the

setting. The operating condition changes from [Ready] to [Insulation door open]. The open insulation door is shown on the display. If the log boiler is not being started up immediately, it can be switched off with the switch.

If the insulation door stays open for more than

30 minutes, an error message appears on the screen. If a TWIN burner is connected to the log boiler and the insulation door stays open longer than 1 minute, the TWIN burner is switched off by the control system, which assumes that the log boiler is being started up.

Once the fuel is ignited and the exhaust temperature is above 100 °C, close the ignition door and the insulating door. The boiler switches to [Ignition] and later to [Heating] mode.

After heating, if the fuel in the boiler has been burned and the exhaust temperature drops below 80 °C, the boiler begins a burnout and subsequently switches to [Ready] mode.

After the heating operation, some charcoal and

embers will remain in the boiler by design so that new fuel can be ignited more easily when it is added later. This function is also called the "ember retention" function. If this function is not desired, for example because the boiler is to be cleaned afterwards, it can be turned off (during heating) by pressing the button. The button is then highlighted in yellow .

9.2.1 Operating elements

[Ember burnout] button

This button can only be pressed during heating mode. It switches off the "ember retention"

function. When shut off, the button is highlighted in yellow . The boiler then carries out a complete ember burnout, so that no embers remain in the fuel chamber.

[Measurement] button

For emission measurement, the wood chip boiler must already be in heating mode.

When this button is pressed, a settings window appears for the emission measurement. Using

the [Begin measurement] button, a date for sweeping of the chimney can be selected. The boiler must be heated up in time to reach the operating

ETAtouch controller [Boiler] function block – log boiler

temperature for measurement. By pressing the [Start now] button, the boiler will immediately begin preparations for a subsequent measurement.

Fig. 9-35: Settings window for emission measurement

In addition, the locking time of the boiler can be adjusted in the settings window ( [Lock duration] button). This relates to the set time of the meas urement. Within this period, a message appears that the boiler is not to be heated up, so that the heating system has time to cool.

The [Deactivate measurement] button ends the emission measurement and switches the boiler back to normal mode.

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[TWIN] function block ETAtouch controller

9.3 [TWIN] function block

Boiler overview

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button. 2 Flow temperature 3 Residual oxygen content of flue gas 4 Boiler consumers

If the pellet burner is in heating mode, a line appears, and the flow temperature and the symbol of the consumer are shown in yellow.

5 [De-ash] button.

This starts an additional de-ashing of the pellet burner.

6 On/Off switch of the pellet burner.

= switched on or enabled = switched off

7 [Measurement] button.

This opens the menu for emission measurement of the pellet burner.

8 [Settings] button.

In this menu, the settings and functions most commonly used can be stored.

9 Pellet stock in boiler.

If the amount of pellets in the pellet bin drops below the minimum, the suction turbine starts and refills

the pellet bin. 10 Return temperature 11 Producer for the pellet burner (pellet store)

Boiler functionality

If the pellet burner is turned on ( ) it is in standby mode ([Ready] operating condition) and the ETA control system can start it when necessary. The pellet burner starts once the buffer demands heat, the log boiler is not supplying heat, and no wood has been added and ignited within the adjustable time period [Start lag] (factory setting 10minutes, see chapter

9.3.2.1 "

Start lag"). There is no need for manual

switching between log and pellet operation. Once the heat is delivered to the consumer, a yellow

line appears beside the symbol of the consumer in the overview. The minimum operating time of the pellet burner is 30 mi nutes. If there is no heat dema nd, the heating operation is completed upon burnout. The operating condition changes to [Ember burnout] and then back to standby.

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

Boiler de-ashing takes place automatically within an adjustable interval. See chapter 9.3.2.3 "

Boiler deashing interval". De-ashing can also be disabled for a

time, e.g. to prevent the boiler from de-ashing at night. See chapter 9.3.2.2 "

Setting the idle time for boiler de-

ashing".

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 chapter 9.3.2.4

"Empty ash box after".

If the insulating door of the log boiler stays open

longer than 1 minute, the control system switches the pellet burner off on the assumption that the log boiler will be filled.

9.3.1 Operating elements

[De-ash] button

Thus, an additional boiler de-ashing is started. When active, the button is highlighted in yellow

. If the boiler is in operation, burnout first takes place when this button is pressed, and de-ashin g only after this. If the boiler is switched off or on st andby , de-ashing can be started straight away.

[Measurement] button

When this button is pressed, a settings window appears for the emission measurement. Using

the [Begin measurement] button, a date for sweeping of the chimney can be selected. The boiler will then start in time to reach the operating

ETAtouch controller [TWIN] function block

temperature for measurement purposes. By pressing the [Start now] button, the boiler will immediately begin preparations for a subsequent measurement.

Fig. 9-36: Settings window for emission measurement

In addition, the locking time of the boiler can be adjusted in the settings window ( [Lock duration] button). This relates to the set time of the meas urement. During this period no heating operation will be started, so that the heating system has time to cool down. Example: If a time of 17:00 is set for the emission measurement and at [Lock duration] 8 h, heating will end at 09:00 .

The [Deactivate measurement] button ends the emission measurement and switches the boiler back to normal mode.

Settings menu

In the settings menu ( [Settings] button in the overview), the following functions and parameters can also be set:

[Fill-up time] button

This sets the daily time for complete refilling of the boiler pellet bin if pellets have been used. This prevents refilling during the night. This

time applies for every day of the week.

[Hopper Fill] button

This fills the reservoir on the boiler immediately , independent of the suction time settings.

9.3.2 Text menu - Adjustable parameters

Adjustable parameters

Detailed descriptions of the parameters are provided below.

9.3.2.1 Start lag

Explanation of [Start lag]

This parameter is used to set the length of the delay in operation of the pellet burner after the buffer has demanded heat.

If there is still a demand from the buffer after this period, then the pellet burner will begin operation.

The parameter can be found under:

9.3.2.2 Setting the idle time for boiler deashing

Explanation of [Duration idle time]

The [Duration idle time] parameter is used to select the duration of the idle time for the boiler's entire de-ashing system. The start time for the idle time is set with the [Start idle time] parameter.

The idle time should be kept as short as possible. If noise is not expected to be a nuisance, you

should reduce the value to 0 hours. The parameters can be found under:

Boiler

Settings

Start lag

Ash removal

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

Boiler

Settings

Start lag

Boiler

Ash removal

Start idle time Duration idle time

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[TWIN] function block ETAtouch controller

9.3.2.3 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.

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

service. The parameters can be found under:

9.3.2.4 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.

The parameter can be found under:

Boiler

Ash removal

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

Boiler

Ash removal

Empty ash box after

ETAtouch controller [TWIN] function block

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[Buffer] function block ETAtouch controller

9.4 [Buffer] function block

Buffer storage tank overview screen

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button.

2 Producer for the buffer.

Currently, the buffer is charged by the burner at a flow temperature of 72 °C.

3 Temperatures of the buffer for individual areas

(top, middle and bottom)

4 Buffer consumers.

Currently, the consumers are charged with a flow temperature of 64 °C.

5 [Settings] button.

In this menu, the charge times are set.

Mode of operation

In the settings menu ( button), the time window for buffer charging can be set, and therefore the char ge times (see chapter 9.4.1 "

Setting the buffer charging times"). The buffer only requests heat from the boiler

during charge times. Within the charge times, it will continue to be loaded by the boiler until the required temperature [Buffer target] has been exceeded in the upper part of the buffer and the adjustable shutdown temperature [Buffer bottom off] is reached in the lower part. The operating mode then changes to [Charged].

If (within the loading times) there is no heat demand from the consumer, the buffer is charged only to the adjustable minimum temperature [Buf fer top min.]. The consumers connected to the buffer (for example, heating circuit or hot water tank) can also reque st heat from the buffer outside the charging times. The charging times of the consumers are independent of the charging times of the buffer.

Buffer charging times that are too brief can cause

the temperatures in the buffer to fall too far and prevent individual consumers from being supplied with heat. For this reason, it is advisable to set generous charging times. A solar heating system connected to the buffer can charge it at any time, regardless of the set buffer charging times.

When the buffer is the only heat producer in the heating system, the buffer charging times also indirectly determine the operating hours of the boiler. Because it can only switch to heating mode within the buffer charging periods.

ETAtouch controller [Buffer] function block

9.4.1 Setting the buffer charging times

Open the overview of the charging times set

The operating hours of the buffer can be adjusted in the settings ( button). To adjust, open the settings and then open the charging times of any given day with the [Charging times Daily plan] button. An overview screen opens.

Fig. 9-37: Overview

1 Set time window (charging times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window

setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Period of the time window

Setting the time window and copying to other days of the week is described in chapter 9.1.6.6

"Setting a time window".

9.4.2 Buffer with solar heating system

Buffer with solar heating system

The control principles of the solar heating system and the different variations are described in

chapter 9.8 "

[Solar] function block".

In the overview of the buffer, the solar heating system appears as another producer for the buffer.

Fig. 9-38: Solar heating system on buffer

1 Currently , the buffer is char ged by the solar heating

system at a flow temperature of 69 °C

2 Additional temperature sensor [Buffer bottom

Solar] for control of the solar heating system

The [Solar priority] function enables the solar

heating system to charge the buffer without the boiler being started within 2 configurable time slots (see 9.4.4.9 "

Solar priority").

If a stratified charger for the buffer is installed, the solar heating system can charge the upper and lower portion of the buffer. The solar heating system is

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[Buffer] function block ETAtouch controller

displayed twice, and the additional buffer temperatures for solar stratified charging are displayed next to the buffer.

Fig. 9-39: Stratified charging of the buffer

9.4.3 Buffer as a combination tank

Buffer with integrated hot water tank or coils

Fig. 9-40: Combination tank

1 Current hot water temperature 2 [Load immediately] button.

Immediate charging of the hot water, independent of the set time slots.

In the settings menu ( button), the time window for the loading of the hot water and the desired hot water temperature can be set (s ee chapter 9.4.3.1 "

Setting

the hot water charging times").

The configurable [Switch-on diff.] parameter additionally allows you to determine how far the hot water temperature can drop before the hot water tank again demands heat from the buffer (see 9.4.4.12 "

Switch-on

diff.").

[Load immediately] button

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

and days of the week if the current temperature has dropped below [Switch-on diff.], ignoring the current time slot. When active, the button is highlighted in yellow .

9.4.3.1 Setting the hot water charging times

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

The charging times for the hot water and th e set temperatures can be adjusted in the settings ( button). To adjust, open the settings and then open the

ETAtouch controller [Buffer] function block

charging times of any given day with the [Hot water Charging times Daily plan] button. An overview screen opens.

Fig. 9-41: Overview

1 Set time window (charging times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window

setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable hot water temperature within the time

window 8 Period of the time window 9 Set-back temperature of the hot water outside the

time window

Setting the time window and copying to other days of the week is described in chapter 9.1.6.6

"Setting a time window".

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[Buffer] function block ETAtouch controller

9.4.4 Text menu - Adjustable parameters

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 parameters are provided below.

9.4.4.1 Buffer top min.

Explanation of [Buffer top min.]

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

The factory setting for this parameter is 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 reduce the solar yield. Because the buffer is kept at the [Buffer top 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.

The parameter can be found under:

9.4.4.2 Buffer bottom off

Explanation of [Buffer 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 [Buffer bottom off] temperature, charging of the buffer by the boiler is stopped.

Buffer

Buffer top

Buffer top min.

Buffer bottom

Buffer bottom off

Extra charge

Buffer top min. Buffer bottom off Extra charging from Chrg. button

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 priority

Solar priority 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.

ETAtouch controller [Buffer] function block

The factory setting for this parameter is 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 [Buffer bottom off] temperature reduces the number of boiler starts and improves boiler running time.

The parameter can be found under:

9.4.4.3 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 [Buffer 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". The parameters can be found under:

At first, set the parameter [Extra storage

activated?] to [Yes], and then the other parameters will be displayed.

To immediately start this additional buffer charge,

simply set parameter [Chrg. button] to [On].

9.4.4.4 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 th e 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].

The parameter can be found under:

9.4.4.5 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 pr iority 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 and bottom section of the buf fer can be found under:

9.4.4.6 Buffer top min. solar

Explanation of [Buffer top min. solar]

Optional: only for solar heating systems 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.

The parameter can be found under:

Buffer

Buffer bottom

Buffer bottom off

Buffer

Extra charge

Extra storage activated? Buffer top min. Buffer bottom off Extra charging from Chrg. button

Buffer

Solar heat diss.

Activate? ...until buffer max

Buffer

Buffer top Solar

Priority

Buffer bottom Solar

Priority

Buffer

Buffer top Solar

Buffer top min. solar

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[Buffer] function block ETAtouch controller

9.4.4.7 Min. out. temp. Solar prio.

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

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

The parameter can be found under:

or also in:

9.4.4.8 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 pump of the solar heating system is switched off.

The parameter can be found under:

9.4.4.9 Solar priority

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

Optional: only with solar heating systems These parameters are used to set the time slots for th e

[Solar priority] 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

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 times for solar priority, it

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

The parameters for setting the 2 time windows are in:

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 wa ter are not supplied with sufficient heat.

Switch function on or off

The parameter can be found under:

9.4.4.10 Extra solar heat

Explanation of [Extra solar heat]

Optional: only with solar heating systems This function defines whether 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.].

• The [Buffer top] temperature in the buffer must

have exceeded the configurable value of [at buffer top].

• The [Buffer bottom Solar] temperature in the buffer

must have exceeded the configurable value of [at buffer bottom sol.].

Buffer

Buffer top Solar

Min. out. temp. Solar prio.

Buffer

Buffer bottom Solar

Solar priority

Min. out. temp. Solar prio.

Buffer

Buffer bottom Solar

Buffer bottom max

Buffer

Buffer bottom Solar

Solar priority

Begin solar prio. Change priority at End solar prio.

Buffer

Buffer bottom Solar

Solar priority

ETAtouch controller [Buffer] function block

• 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 ta ke 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 hot water tank or the heating circuit.

The parameters can be found under:

9.4.4.11 Priority 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 parameter can be found under:

9.4.4.12 Switch-on diff.

Explanation of [Switch-on diff.]

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

far the current warm water temperature can fall before the hot water tank again demands heat from the boile r .

If the value is set to 15 °C, the current hot water

temperature may drop by 15 °C from the value [Hot water tank target]. The combination t ank 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.

The parameter can be found under:

9.4.4.13 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. The parameter can be found under:

9.4.4.14 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.

The parameter can be found under:

9.4.4.15 Enable circulation

Optional: only for combination tank with circulation pump

Explanation of [Enable circulation]

Optional: only for circulation pump This parameter defines the minimum temperature of

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

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

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.

Hot water tank

Circulation

Circulation runtime

Hot water tank

Circulation

Circulation pause

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[Buffer] function block ETAtouch controller

The parameter can be found under:

Hot water tank

Circulation

Enable circulation

ETAtouch controller [Buffer] function block

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[Hot water tank] function block ETAtouch controller

9.5 [Hot water tank] function block

Hot water tank overview screen

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button.

2 Producer for the hot water tank.

Currently, the hot water storage tank is charged by the buffer with a flow temperature of 61 °C, and from the solar system with 74 °C.

3 Temperature of the hot water tank.

The temperature in the lower area of the tank only appears if an additional temperature sensor is installed.

4 [Load immediately] button.

Immediate charging of the hot water, independent of the set time slots.

5 [Settings] button.

In this menu, the time window can be set, for example.

[Load immediately] button

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

and days of the week if the current temperature has dropped below [Switch-on diff.], ignoring the current time slot. When active, the button is highlighted in yellow .

Mode of operation

In the settings menu ( button), the time window for charging the hot water and the desired hot water temperature can be set. See chapter 9.5.1 "

Setting the

hot water charging times".

Within the charging times, the hot water is charged to the set hot water temperature (for example: 60 °C). The charge starts as soon as the current hot water temperature is lower than the set hot water temperature by the adjustable difference [Switch-on diff.].

Example: In the time window, the hot water temperature is set to 60 °C. The difference [Switch-on diff.] is 15 °C. => Charging starts as soon as the hot water temperature drops to 45 °C, and it ends as soon as the hot water has reached 60 °C.

If an additional temperature sensor [] 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].

ETAtouch controller [Hot water tank] function block

9.5.1 Setting the hot water charging times

Open the overview screen of the set charging times and temperatures

The charging times for the hot water and the set temperatures can be adjusted in the settings ( button). To adjust, open the settings and then open the charging times of any given day with the [Charging times Daily plan] button. An overview screen opens.

Fig. 9-42: Overview

1 Set time window (charging times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window

setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable hot water temperature within the time

window 8 Period of the time window 9 Set-back temperature of the hot water outside the

time window

If an additional circulation pump for hot water is installed, the operating times of this are set in the

same way ( [Circulation times Daily plan] button).

Setting the time window and copying to other days of the week is described in chapter 9.1.6.6

"Setting a time window".

9.5.2 Text menu - Adjustable parameters

Commonly used parameters can be found in the settings

Commonly used parameters can be found in the

function block settings ( button). There, the parameters are identified by the symbol and can be adjusted by tapping. This saves you having to search through the text menu for these parameters.

Adjustable parameters

Detailed descriptions of the parameters are provided below.

9.5.2.1 Switch-on diff.

Explanation of [Switch-on diff.]

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

If the value is set to 15 °C, the current hot water

temperature may drop by 15 °C from the value [Hot water tank target]. The hot water tank only demands heat from the buffer or boiler when this happens.

The parameter can be found under:

9.5.2.2 HW bottom off

Explanation of [HW bottom off]

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

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.

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[Hot water tank] function block ETAtouch controller

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.

The parameter can be found under:

9.5.2.3 Solar heat diss.

Explanation of [Solar heat diss.]

Optional: only for accumulator tanks with solar heatin g system

This parameter defines whether the hot water tank may take excess solar heat from the buffer. If this parameter is set to [Y es], the hot water tank takes the solar excess up to the maximum temperature [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 accumulator tank. The parameter can be found under:

9.5.2.4 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 parameter can be found under:

9.5.2.5 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.

The parameter can be found under:

9.5.2.6 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 af ter this time has elapsed. This pause is only valid inside the set time slot.

The parameter can be found under:

Hot water tank

HW bottom off

Hot water tank

Solar heat diss.

Hot water tank

Priority

Circulation

Circulation runtime

Circulation

Circulation pause

ETAtouch controller [Hot water tank] function block

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[Fresh water module] function block ETAtouch controller

9.6 [Fresh water module] function block

Fresh water module overview screen

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button.

2 Producer for the fresh water module.

Currently , the fresh water module is charged by the

buffer at a flow temperature of 58 °C. 3 Primary side return temperature 4 Circulation pump (only displayed if it has been

installed and is in operation) 5 Hot water temperature (the tap is displayed only

when hot water is currently being drawn) 6 [Settings] button.

In this menu, the time window can be set, for

example.

Function of the fresh water module

The desired hot water temperature is set with the potentiometer on the fresh water module. If [Target value can be set with rotary knob] has been disabled in the configuration, different time windows and hot water temperatures can be set. See chapter 9.6.1 "

Setting

the hot water charging times".

Inside these time windows, the upper part of the buffer is maintained at no lower than the configured hot water temperature. Outside the set time windows, the hot water is maintained at the lowest set temperature of the time windows, provided that the accumulator tank 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. When this function is switched off, the operating times for the circulation pump can be set manually. This is achieved by opening the settings ( button) and pressing the [Circulation times Daily plan] button.

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.

ETAtouch controller [Fresh water module] function block

9.6.1 Setting the hot water charging times

Open the overview screen of the set charging times and temperatures

The standby times for the hot water and the set temperatures can be adjusted in the settings ( button). T o adjust, o pen the settings and then open the st andby times of any given day with the [Stand-by times Daily plan] button. An overview screen opens.

Fig. 9-43: Overview

1 Set time windows (standby times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window

setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable hot water temperature within the time

window 8 Period of the time window 9 Set-back temperature of the hot water outside the

time window

Setting the time window and copying to other days of the week is described in chapter 9.1.6.6

"Setting a time window".

If an additional circulation pump is installed, the

operating times of this are set in the same way. The operating hours can be accesse d via th e setting s with the [Circulation times Daily plan] button.

9.6.2 Text menu - Adjustable parameters

Adjustable parameters

Detailed descriptions of the parameters are provided below.

9.6.2.1 Function Automatic venting

Explanation of [Automatic venting]

This function attempts to remove in troduced air from the fresh water module automatically. If the function is activated and the controller detects ai r 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. The parameter can be found under:

9.6.2.2 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.

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

The parameter can be found under:

Hot water

Automatic venting Emergency operation only with buffer pump

Circulation

Self-learning Circulation runtime Circulation pause

Hot water

Automatic venting

Hot water

Emergency operation only with buffer pump

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[Fresh water module] function block ETAtouch controller

9.6.2.3 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. When [No] is set, the operating times for the circulation

pump can be set manually. The parameter can be found under:

9.6.2.4 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. The parameter can be found under:

9.6.2.5 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.

The parameter can be found under:

Circulation

Self-learning

Circulation

Circulation runtime

Circulation

Circulation pause

ETAtouch controller [Fresh water module] function block

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[Heating circuit] function block ETAtouch controller

9.7 [Heating circuit] function block

Overview of the heating circuit when a room sensor is installed

Fig. 9-44: Heating circuit with room sensor

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button. 2 Producer for the heating circuit 3 On/Off switch for the heating circuit

= switched on

= switched off 4 Increase or decrease the room temperature 5 [Settings] button.

In this menu, the heating times and the heating curve can be adjusted, for example.

6 Graphic display of the heating times and room tem-

peratures settings 7 Operating mode [Timer] 8 Operating mode [Set-back] 9 Operating mode [Heating]

Overview of the heating circuit without a room sensor

In the overview, a temperature slider appears, rather than the measured room temper ature.

Fig. 9-45: Heating circuit without room sensor

1 Graphic display of the heating times settings 2 Temperature slider

Mode of operation

If the heating circuit is turned on ( ), heat is supplied on the basis of the time windows set. The temperature is controlled with the heating curve (see chapter 9.7.3 "

The heating curve"), the optional room

sensor and the time window settings (see chapter

9.7.2 "

Setting the heating time slots").

During a time window, the heating circuit is in heating mode. If a room sensor is installed, this regulates the heating circuit so that the set room temperature is achieved. If a room sensor is not installed, the heating circuit is controlled with the heating curve for the heating mode. Accurate temperature control is therefore difficult.

Outside the set time slots, the heating circuit is in reduced operation mode. This means that the room sensor only regulates to the set reduced room temperature [Set-back temperature outside the time window]. Without a room sensor, the heating circuit is controlled with the heating curve for the reduced operation mode.

Switching between heating and reduced operation takes place automatically when the button is used in the user interface to select the [Timer] operating mode.

The operating modes are also manually adjustable. Heating mode is activated with the button, and reduced operation mode with the button. See chapter 9.7.1 "

Operating elements".

ETAtouch controller [Heating circuit] function block

9.7.1 Operating elements

[Timer] button

The heating circuit is switched to automatic mode. This means that changing between

operating modes [Heating] (within a time window) and [Set-back] (outside a time window) is based on the set time window. This operating mode is enabled by default if the heating circuit is turned off an d then turned back on.

[Heating] button

Thus, the heating circuit is manu ally switched

to heating mode. With the additional switch

(above the symbol), the heating circuit can be set to remain permanently in heating mode, thus ignoring any time window, or set temporarily until the next time window.

[Set-back] button

Thus, the heating circuit is manu ally switched to reduced operation mode. With the additional

switch (above the symbol), the heating circuit can be set to remain permanently in reduced operation mode, or set temporarily until the next time window.

Temperature slider

This slider is only displayed if a room sensor is installed for the heating circuit. The temperature slider is used to adjust the desired room temperature in a range of +/- 5 °C. By sliding the

switch into the blue area of the scale, the flow temperature is lowered, and thus the room temperature also. In the red area, the flow temperature is raised.

Adjusting the required room temperature

This field is only displayed if a room sensor is installed for the heating circuit. The ar rows

are used to set the required room temperature. In heating mode, an in crease o f 1 °C caus es the room temperatures of all time slots for all days of the week to increase by this value. In reduced operation mode, a reduction by 1 °C causes the reduced temperature for all days of the week to decrease correspondingly.

9.7.2 Setting the heating time slots

Open the overview screen of set heating times

The operating hours of the heating circuit (heating times) can be adjusted in the set tings ( button) . To adjust, open the settings and then open the heating times of any given day with the [Heating times Daily plan] button. An overview screen opens.

Fig. 9-46: Overview

1 Set time window (heating times) 2 Select day of the week 3 Add another time window 4 Graphical representation of the time window

setting 5 Overview of all time windows for the entire week 6 Delete time window 7 Adjustable room temperature.

This is displayed only when an optional room

sensor is installed. 8 Period of the time window 9 Set-back temperature.

The room temperature may drop to this value

outside the time window.

Setting the time window and copying to other days of the week is described in chapter 9.1.6.6

"Setting a time window".

Setting absent time (holiday function)

In each heating circuit, a time frame can be defined for reduced operation mode. The heating circuit is then operated with the lowest set-back temperature. This function is also called the holiday function.

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[Heating circuit] function block ETAtouch controller

To set the holiday function, open the heating circuit settings ( button), and press the [Vacation] button. A settings window appears.

Fig. 9-47: Holiday function

1 Start of the period 2 End of the period

T ap the date field to open a calendar to select the date. Enter the time using the arrow keys. Close the window using the arrow on the left side.

In the above example, the heating circuit operates in reduced operation mode from 10 November at 08:00 a.m. until 24 November at 1:00 p.m. After expiry of the period, the heating circuit independently reverts to automatic mode.

During the set holiday time period, the heating

circuit is operated only in reduced-temperature mode. Therefore, you must che ck t he set h e at i ng lim it for reduced-temperature mode (see chapter 9.7.3.2

"Setting the heating limits"). At settings below 0 °C,

there is a risk of freezing. Also check the reduced room temperature outside of the heating times (see 9 "

Set-back temperature. The room temperature may drop to this value outside the time window."). If the room temperature is set too low,

there is a danger of freezing.

9.7.3 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 adjusted in the settings of the heating circuit ( button). Open this and then change the heating curve in the menu with the [Heat curve] button. The settings for the heating curve are displayed.

Fig. 9-48: Heating curve settings

1 Heating curve for heating mode (red line) and

reduced operation mode (blue line)

2 Parameters for setting the heating curve and the

heating limits

3 Change settings for the heating curve in heating

mode or reduced operation mode

The two adjustable parameters [Flow at -10 °C]

and [Flow at +10 °C] are used to define the heating curve for the heating mode (red line in the diagram). The resulting line is the heating curve of the heating mode (within the preset heating times). The heating curve for reduced operation mode (blue line in the diagram) is determined by a parallel shift of the heating curve of the heating mode. This shift is set via the [Set-back difference] parameter.

ETAtouch controller [Heating circuit] function block

Based on the current outside temperature, the control system uses the heating curve to calculate the required feed temperature for the heating mode. For example, an outside temperature of -10 °C would result in a feed temperature of 33 °C (see diagram).

Fig. 9-49: Heating curve of underfloor heating

1 Maximum flow temperature 2 Parameter [Flow at -10 °C] is used for adjusting the

heating curve for outside temperatures below freezing

3 Parameter [Flow at +10 °C] is used for adjusting

the heating curve for outside temperatures above

freezing 4 Heating threshold for heating mode 5 Heating limit for reduced-temperature mode

If an ETA 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 temperature value.

For each heating circuit, separate heating limits are adjustable for heating mode (within the set heating times) and reduced operation mode (outside the set heating times). If the current outside temperature exceeds the configured heating temperature (for example 18 °C), the heating circuit is switched of f. The same applies to reduced-temperature mo de as soon as the outdoor temperature exceeds the set heating limit.

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, and 65 °C for radiators.

When should the heating curve be adjusted?

If the rooms are not warming up, you should check the following points first before changing the h eating curve in the control system. Cold rooms are often not only caused by an incorrectly set graph.

Rooms with radiator thermostats or room thermostats

• Check the current setting of the radiator thermostat or the room thermostat. If a room is not warm, open the thermostat fully or increase the temperature setting on the thermostat.

Fig. 9-50: Radiator thermostat and room thermostat

If the room is still not warm in heating mode (within the preset heating times), the temperature slider in the control system must be set higher (see chapter

9.7.1 "

Operating elements") or the heating curve

needs to be adjusted (see 9.7.1 "

Operating

elements").

If the room is too warm in heating mode,

leave the radiator thermostat and room controller open, and instead lower the temperature slide in the control system or the heating curve. If the rooms are too warm or cold in reduced operation mode (outside the heating times), only the [Set-back difference] parameter needs to be adjusted. See chapter Fig. 9-54: "

Adjust reduced

operation mode".

• Check the adjusted heating limits in the control system, see chapter 9.7.3.2 "

Setting the heating limits". Heating limits that are set too high or too

low can be the reason for rooms being too cold or too warm.

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[Heating circuit] function block ETAtouch controller

Check operating mode and target room temperature on the ETA room sensor

• If a room is too cold, check the room sensor, or in the control system set the operating mode and the desired room temperature. It is possible that the heating circuit has been switched off or the room temperature is set too low.

Fig. 9-51: ETA room sensor

• Check the settings of the following parameters in the text menu of the heating circuits:

–[Room effect], see chapter 9.7.4.1 "

Room

effect"

–[Switch-on diff. room] and [Switch-off diff. room] see chapter 9.7.4.2 "

Switch-on diff.

room and Switch-off diff. room"

• If during heating mode the rooms are constantly too cold (within the set heating times), the heating curve must be adjusted. See chapter Fig. 9-52:

"Adjust heating curve (at outdoor temperatures above freezing)".

If the rooms are too cold in reduced-temperature mode (outside the heating times), only the [Setback difference] parameter needs to be adjusted. See chapter Fig. 9-54: "

Adjust reduced operation

mode".

Check the heating time settings

• Check the heating time settings in the control system, see chapter 9.7.2 "

Setting the heating time slots".

For heating systems with buffer storage, often heating times that are too short are the reason for insufficiently warm rooms. Short heating times (less than 5 hours continuous heating) are particularly ill-advised for underfloor heating because such systems react very slowly.

Optimal operation is enabled with low feed temperatures (=[Flow at +10 °C] an d [F low at - 10 ° C]) for the heating curve and long continuous heating times (10-14 hours). Thus, the heat is transferred evenly throughout the room. Therefore, it is advisable (in heating systems with a buffer) to first set a longer heating time and wait a few days. If the rooms are then still too cold, the heating curve must be adjusted. See chapter 9.7.1 "

Operating

elements".

If no buffer storage tank is available,

several short heating times must be set with pauses in between. This increases the heat absorbed by the heating circuit from the boiler in the short heating times. Through this heating time interruption, the screed becomes a "buffer" in case of underfloor heating. Between the heating times, the screed cools and then absorbs heat again. In a well-insulated building, observe the following guidelines:

–Radiator heating: several intervals with 3 hours of heating and 2 hours break

–Underfloor heating: several intervals with 4 hours of heating and 3 hours break

The optimum settings depend on the heat deman d of the building and each room. Explore this in consultation with your heating contractor or ETA customer service.

ETAtouch controller [Heating circuit] function block

9.7.3.1 Adjusting the heating curve

Adjusting the heating curve

The heating curve is adjusted through the settings of the heating circuit ( button) in the heating curve menu ( button). How the heating curve is altered depends on whether the rooms are always too warm or too cold at outdoor temperatures above freezing or below freezing.

Make adjustments to the heating curve in small

increments only. For underfloor heating, never change more than 2 °C at once, and for radiators never more than 4 °C. You may need to adapt the heating curve again after a couple of days, but if you, do it in small increments, it is more precise and energy efficient.

At outdoor temperatures above freezing, the rooms are always too hot or too cold:

1. Only parameter [Flow at +10 °C] is adjusted.

2. Change the selector switch to the heating mode

position ( ). Use the arrow keys to reduce parameter [Flow at +10 °C] if it is too warm, or increase if it is too cold.

Fig. 9-52: Adjust heating curve (at outdoor temperatures

above freezing)

At outdoor temperatures below freezing, the rooms are always too hot or too cold:

1. Only parameter [Flow at -10 °C] is adjusted.

2. Change the selector switch to the heating mode position ( ). Use the arrow keys to reduce parameter [Flow at -10 °C] if it is too warm, or increase if it is too cold.

Fig. 9-53: Adjust heating curve (at outdoor temperatures

below freezing)

Outside the heating times, t he rooms are always too hot or too cold:

1. Then only the reduction is adjusted with parameter [Set-back difference].

2. Change the selector switch to the reduced operation mode position ( ). Use the arrow keys to reduce parameter [Set-back difference] if it is too cold, or increase if it is too warm.

Fig. 9-54: Adjust reduced operation mode

With underfloor heating, reduced operation mode is only partially noticeable because this heating system reacts very slowly due to the high thermal mass of the screed. Changes in parameters [Set-back difference] are therefore often not noticeable.

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[Heating circuit] function block ETAtouch controller

9.7.3.2 Setting the heating limits

Specifying the heating limits for the heatin g circuit

For each heating circuit, separate heating limits are adjustable for heating mode (within the set heating times) and reduced operation mode (outside the set heating times).

If the current outside temperature exceeds the configured heating temp erature (for example 18 °C), the heating circuit is switched off. The same applies to reduced-temperature mode as soon as the outdoor temperature exceeds the set heating limit.

If the outside temperature falls below the set

heating limit (for example: 18 °C), a hysteresis of 2 °C will be observed in order to avoid cycling the heating circuit. Accordingly, the heating circuit will switch on only once the outside temperature falls below 16 °C (=18 °C - 2 °C).

The heating limits are adjusted through the settings of the heating circuit ( button) in the heating curve menu ( button).

Setting heating limits for heating mode

1. Change the selector switch to the heating mode

position ( ). Use the arrow keys to reduce parameter [Heating

threshold], so that the heating circuit in heating mode switches off at a lower outside temperature, or increase the value.

Fig. 9-55: Heating threshold for heating mode

Setting heating limits for the reduced operation mode

1. Change the selector switch to the reduced operation mode position ( ).

Use the arrow keys to reduce parameter [Heating threshold], so that the heating circuit in reduced operation mode switches off at a lower outside temperature, or increase the value.

At settings below 0 °C, there is a risk of freezing.

Fig. 9-56: Heating limit for reduced-temperature mode

ETAtouch controller [Heating circuit] function block

9.7.4 Text menu - Adjustable parameters

9.7.4.1 Room effect

Explanation of [Room effect]

Optional: only for room sensor The flow temperature is calculate d on the basis of t he

heating curve and the outside temperatur e. If the ro om temperature falls by 1°C, the target flow temperature is increased by this set value. If the room temperature rises by 1°C, the target flow temperature is decreased by the set value.

For underfloor and wall heating with a design temperature of 30 °C, set the room influence to 1

°C; with a design temperature of 40 °C, set it to 2 °C.

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

The parameter can be found under:

9.7.4.2 Switch-on diff. room and Switch-off diff. room

Explanation of [Switch-on diff. room] and [Switchoff diff. room]

Optional: only for room sensor These parameters specify the allowed deviation of th e

set room temperature for switching the heating circuit on and off.

Example: Room temperature setting = 21 °C [Switch-on diff. room] = 0.5 °C [Switch-off diff. room] = 2 °C => The heating circuit will be switched off as soon as the room temperature reaches 23 °C (=21 + 2 °C). If the room temperature falls to 21.5 °C (=21+0.5 °C), heat is supplied to the heating circuit again.

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

The parameter can be found under:

Heating circuit

Room

Room effect

Heating circuit

Room

Switch-on diff. room Switch-off diff. room

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[Solar] function block ETAtouch controller

9.8 [Solar] function block

Overview of the solar heating system

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button. 2 Collector temperature 3 Solar heating system consumer.

Currently , the hot water storage tank is loaded from the solar heating system with a flow temperature of 74 °C. The second buffer consumer is not currently charged.

The solar heating system control principle

The ETA control principle for solar heating systems is defined so that an adjustable temperature difference between the panel and the tank (or the upper and lower buffer area in a buffer with 2 internal coils) is complied with. This is done by adjusting the speed of the solar pump.

Manual switching between "High Flow" (high spee d at a lower collector temperature) and "Low Flow" (low speed at a higher collector temperature) is not necessary, because this is automatically controlled.

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.

9.8.1 Solar heating system with one tank

Solar heating system with only one tank

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.

Fig. 9-57: Solar heating system connected to buffer

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 (the factory setting of the buffer is 90 °C, and the hot water tank 60 °C), or if the collector is only warmer by the offset [Switch-off diff.] (factory setting 5 °C) than the tank, the collector pump is switched off.

Example:

Buffer temperature [Buffer bottom Solar]: 45 °C [Target collector diff.]: 10 °C [Switch-off diff.]: 5 °C => The speed of the solar pump is adjusted , so that the temperature on the collector reaches 55 °C. With the increase in buffer temperature, the collector temperature also increases, because the 10° difference is adhered to.

If the collector temperature cannot be increased (because the sun provides too little heat), the collector pump switches off when there is only a 5 °C difference between the collector and the buffer. Otherwise, the buffer is charged to the maximum temperature of 90 °C.

ETAtouch controller [Solar] function block

9.8.2 Solar heating system with 2 tanks

Switching between several tanks

If the solar heating system charges several tanks (for example, buffer and hot water tanks) it will switch between tanks on the basis of the currently set priorities. The tank with the highest priority is charged first.

Fig. 9-58: Solar heating system for the buffer and hot water

tank

If the solar power is not sufficient for charg ing the tank with the highest priority (collector is only warmer by th e difference [Switch-off diff.] than the tank that currently requires charging), the tank with the next highest priority is charged after the minimum time has e lap sed (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 charge d first.

Uniform charging of tanks without consider ation

of individual priorities is also possible. The [Service] permission is required for this. Then you can use the [Changeover if diff. >] parameter in the solar heating system text menu to configure the temperature difference between the tanks.

9.8.3 Solar heating system for buffer with 2 internal coils

Switching between two internal coils

When switching between two internal coils, charging is defined in two different areas of the buffer. The purpose is to produce a sufficiently high te mperature in the top part of the buffer, so that the boiler does not have to start for hot water charging.

Fig. 9-59: Solar heating system with switching between two

coils at the buffer

The solar pump starts as soon as the panel is warmer than the current temperature in the upper buffer area [Buffer top Solar].

An internal target temperature [Bu ffer target solar] is provided to control switching. The target temperature is determined by referencing curre nt requirements or minimum temperatures and can be viewed in the buffer's text menu under:

The conditions for solar char ging into the up per buffer coil are:

• The buffer is not currently charged from the boiler.

• The outside temperature is above the set minimum

temperature of 10 °C ([Min. out. temp. Solar prio.], see chapter 9.4.4.7 "

Min. out. temp. Solar prio.")

• The temperature in the upper buffer area [Buffer

top Solar] is lower than the target temperature [Buffer target solar]

If all conditions are met and the collector is sufficiently warm, the upper buffer area will be charged until the target temperature [Buffer target solar] is exceeded. Subsequently, solar charging is switched to the lower coil in order to charge this buffer area.

Buffer

Buffer top Solar

Buffer target solar

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[Solar] function block ETAtouch controller

If one of the described conditions is not met (for

example, if the buffer is currently being charged by the boiler), there is no reason to feed the solar charge to the upper buffer coil. Therefore, the solar charge is directed into the lower coil in order to charge this area. If all conditions are once again met, charging is switched to the upper coil.

The only exception to this is when solar power

increases while charging the lower buffer coil. Then, once the minimum time (factory setting 20 min.) passes, charging will switch to the upper coil, although the conditions are not met.

9.8.4 Solar heating system with external heat exchanger

Solar heating system with external heat exchange r

The control principle is the same as in a solar heating system with just one tank, see chapter 9.8.1 "

Solar heating system with one tank".

The speed of the collector pump also controls the adjustable temperature difference [Target collector diff.] between the collector and the tank.

Fig. 9-60: Solar heating system with external heat exchanger

connected to buffer

In addition, a variable speed secondary pump is

available for the heat exchange r. Through speed adjustment, it attempts to adapt the temperature difference between collector and secon dary flow (see chart 78 °C - 74°C = 4 °C) to the temperature difference between the return of the solar heating system and the tank (49 °C - 45 °C = 4 °C).

Fig. 9-61: Regulation principle

ETAtouch controller [Solar] function block

In solar heating systems with external heat exchangers, experience has shown that most of the energy from the solar heating system goes to the tank in this control principle.

9.8.5 Solar heating system with external heat exchanger and stratified charging valve

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

This variation of solar heating system also aims to produce a sufficiently high temperature in the upper area of the buffer, so the boiler does not have to start for hot water charging.

Fig. 9-62: Solar heating system with external heat exchanger

and stratified charging valve

The collector pump starts as soon as the collector is warmer than the target temper ature in the upper buff er area [Buffer target solar].

The control principle is identical to that of a buffer with two internal coils. The conditions for solar charging into the upper buffer coil are also the same. They are described in chapter 9.8.3 "

Solar heating system for buffer with 2 internal coils".

The speed control of the secondary pump is identical to that of a solar heating system with an external heat exchanger, see chapter Fig. 9-61: "

Regulation

principle".

The only difference is the switching of solar

charging from the lower buffer coil to the u pper. If the conditions for solar charging into the upper co il are not met, the lower coil will be charged first. If the secondary feed temperature rises enough that the temperature in the upper buffer area [Buffer top Solar] is exceeded, solar charging is immediately switched to the upper coil. There is no minimum time for solar charging. Once the secondary feed temperature d rops below the temperature [Buffer top Solar], the lower coil is again charged.

The secondary flow temperature rises when the

collector temperature increases or the speed of the secondary pump decreases.

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[Solar] function block ETAtouch controller

9.8.6 Text menu - Adjustable parameters

9.8.6.1 Collector min

Explanation of [Collector min]

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

Do not set this temperature too high, to ensure

that it is possible for heat to supplied to pre-hea t the tank even when there is little sunlight. The optimal range is between 30 °C and 50 °C.

The parameter can be found under:

9.8.6.2 Target collector diff.

Explanation of [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 pump.

If the buffer is being charged by the sola r 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 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.

A low temperature difference results in a high

speed of the solar pump. A larger quantity 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.

The parameter can be found under:

State

Collector

Collector min

State

Collector pump

Target collector diff.

ETAtouch controller [Pellet store] function block

9.9 [Pellet store] function block

Pellet store overview screen

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button.

2 Current pellet stock.

This is calculated by the control system and can therefore differ by +/- 15% from the actua l pellet

supply 3 Consumer of the pellet store (boiler) 4 Enter new stock levels after filling

[Stock level] button

After filling the pellet store, a new supply of pellets is fed in with this button.

Example: 1200 kg of pellets are available, and 3000 kg is refilled. The new stock will be registered as 4200 kg.

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 ETAtouch controller

9.10 [Pellet store with switch unit] function block

Overview of pellet store with switching unit

Up to 4 suction heads can be controlled by one switching unit.

1 Operating condition and information.

A description of the operating conditions can be found in the integrated Help menu by pressing the

button.

2 Current pellet stock.

This is calculated by the control system and can therefore differ by +/- 15% from the act ual pellet

supply 3 Manually switch to next enabled suction probe 4 Enter new stock levels after filling 5 Suction probe enabled: pellets can be conveyed

from this suction probe. 6 Suction probe restricted: this suction probe is not

activated by the switching unit

[Stock level] button

After filling the pellet store, a new supply of pellets is fed in with this button.

Example: 1200 kg of pellets are available, and 3000 kg is refilled. The new stock will be registered as 4200 kg.

Manually changing suction probes

This button manually switches to the next enabled suction probe, in order to move the

pellets.

Disabling and enabling a suction probe

This symbol represents an enabled suction probe. This can be controlled by the switching

unit for conveying the pellets. If an enabled suction probe is selected, then this is locked ( symbol). It will then no longer be activated by the switching unit. By re-selecting the locked suction probe, it is enabled again ( symbol).

Function of the switching unit

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 order to dislodge an y blockages in the conveying hose or suction head.

If an enabled suction probe is selected ( symbol), this is then locked ( symbol). It will then no longer be activated by the switching unit. Re-selection of the locked suction probe frees it again ( symbol).

The switch unit regularly switches between the individual, enabled suction heads, to ensure that the pellet store is emptied uniformly. You can adjust the maximum number of fill-up operations by a suction head, see 9.10.1.1 "

Switching at".

With the button, you can also manually change to another enabled suction probe.

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.

9.10.1 Text menu - Adjustable parameters

9.10.1.1 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.

The parameter can be found under:

Conveying system

Switching at

Regular cleaning

10 Regular cleaning

Stop heating, perform ember burnout

During the final heating operation with the log boiler, press the [Ember burnout] button in the boiler overview (the button will then be shown in yellow ). Ember retention is then deactivated and the log boiler performs a complete ember burnout (duration approx. 1 hour). burning most of the charcoal in the fuel chamber.

Also deactivate the pellet burner with the On/Off switch

in the pellet burner overview.

Begin maintenance only after the log boiler and the pellet burner have cooled sufficiently.

Check heating system's water pressure

In buildings with up to three storeys, the optimum

water pressure in a cold heating system is between 1 and 2 bar. For a warm heating system, the optimum water pressure is between 1.5 and 2.5 bar.

De-ash boiler

Use the poker to rake the ash out of the combustion chamber and the ash collection duct into the ash pan. The rear end of the ash collection duct must also be cleared out so that there is no ash in front of the lambda probe head.

The draught fan runs during de-ashing. So remove the ash from the boiler slowly and gently to avoid stirring it up too much and having it blown out through the flue.

Fig. 10-1: Removing ash from the combustion chamber

Fig. 10-2: Removing ash from the ash collection duct

The ash in the fuel chamber is needed as

insulation for ember retention. So approximately 3 cm of ash should be left in the fuel chamber. Scrape the remaining ash from the fuel chamber into the combustion chamber. Some pieces of charcoal will drop into the combustion chamber during this process; these are best left there. The charcoal will burn during the next combustion cycle and the ash will protect the bottom of the combustion chamber against premature wear.

Fig. 10-3: Scraping extra ash and charcoal into the

combustion chamber

If there are still embers in the ash, leave the ash

in a closed, non-flammable container for at least 2 days. Only put it in the rubbish bin when it is certain that there are no more embers present.

Do not slide the ash pan into the combustion

chamber. Although that is possible with 40 - 60 kW boilers, the ash pan is not intended for this purp ose and would be destroyed by the high temperatures there.

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Regular cleaning

Check walls of ash collection duct

The walls of the ash collection duct may be white to brown in appearance. If they are black with soot, eithe r too much wood was burned at too low a heat consumption, the fire was not lit correctly at start-up or, in very infrequent cases, the lambda probe gave incorrect measurement values.

Fig. 10-4: Check walls of ash collection duct

Empty the ash box

Before you empty the ash box, the pellet burner

must be switched off and [Switched off] mode displayed in its overview window. If the pellet burner is in heating mode, end it by pressing the On/Off switch in the boiler overview window. The boiler then performs an ember burnout and switches to [Switched off] mode.

On both sides of the ash box is a tension lock that fixes the ash box to the boiler. Open both tension locks by pressing the safety catch in the direction of the arrow.

Fig. 10-5: Opening the latches

Pull the ash box straight out from the front of the boiler.

Fig. 10-6: Removing the ash box

T ake of f the cover of the ash box by slackening the two tension locks, and empty the ash box. Check the seal on the ash box cover to ensure it is in good condition.

Fig. 10-7: Empty ash box, check seal

Check the ash for embers. Never put hot ash into the waste bin due to risk of fire!

Also check the integrity of the seal on the boiler. If it is damaged, the boiler can suck in leak air, causing combustion problems and malfunctions.

Fig. 10-8: Check seal

Regular cleaning

Finally, place the cover back on the ash box and secure with the tension locks. Next, connect the ash box to the boiler and secure with the two tension locks at the sides.

Switch the pellet burner back to au tomatic mode with the On/Off switch in the pellet burner overview.

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Heating value

11 Heating value

Split wood will dry out in just one summer

The moisture content of split logs intended for a log boiler should be below 20% (air dry).

Damp wood with a moisture content of above 20% creates a moist climate in the fuel chamber . W ood that is not sufficiently dry can cause the boiler's fuel chamber to rust through.

One summer is sufficient to dry out split firewood

Unsplit logs stacked as metre-long pieces in the forest will generally take two summers to dry.

However, it can be done faster. If the timber is felled in winter (before the end of January) and split immediately, a moisture content of 15% can be reached by September through air-drying. Split logs also burn far better than unsplit logs.

Unsplit logs take two months longer, and thus a

second summer, to dry. The best approach is to split the wood in lengths of 1

m immediately after felling: split in half for a log diameter of up to 15 cm, into quarters for a diameter up to 20 cm, into sixths for a diameter up to 25 cm, and into eighths for a diameter up to 30 cm.

Store the split wood in a windy place on a dry surface; ideally stack crosswise on two logs or concrete pipes and cover only the top. Of course a sunny location is

preferable, but it is more important to find a dry, windy place. Leave a gap between stacks as well. If you stack wood along the wall of a ho use, leave an air ga p of at least 10 cm between the wall and the stack of wood.

Wood stored outside in winter will absorb moisture from precipitation. For this reason either move the wood to a covered location in September or at least temporarily store it in a warm room for a week before burning.

During storage the heating value is reduced by processes similar to decay; depending on how dry storage conditions are, the loss can be between 1% and 3% per year. For this reason, only store firewood for longer than 3 years in exceptional circumstances.

Split the wood and store it in a dry, windy place, one percent moisture more or less will not make a big difference

T o sum up: the heating value changes by only 2%

between 20% and 10% moisture content. It is easy to achieve less than 20% – even if you cut the wood in summer – if you split the wood and store it outdoors with protection against the rain for a year.

Fig. 11-1: Source: "Rationelle Scheitholzbereitsstellungsverfahren" (economical methods for preparing split logs), Report

11, TFZ Straubing, with heating values added by ETA.

Heating value of wood

Split wood is typically sold in stacks by the stere. The energy content does not only depend on the kind of wood. The amount of heat contained in a stere also

Heating value

depends on whether the wood is unsplit round logs, metre-long split logs, or ready-to-burn split logs, and on whether it is fresh from the forest or dried for firewood.

The wood volume stays constant from when it is freshly cut with a moisture content of 60% to the fibre saturation point at 25%. The wood starts to contract if dried below this point. It shrinks, and this is why airdried wood (moisture content of 15%) has more wood substance per stere than freshly cut wood. The difference is typically 5% to 6% for softwood, and 6% to 9% for hardwood.

Logs are not straight. The longer the logs are, the less wood and the more air is present per stere. There is typically more air in "crooked" hardwood than in "straight" softwood.

There is one further difference: round logs can typically be stacked in a far more comp act way than me tre-long split logs. If you split the wood yourself, buying round logs will give you up to 15% more wood per stere.

In practice, deviations on the order of +/-10% compared with theoretical values are to be expected. Up to 20% is possible in extreme cases, not only because the wood is particularly straight or crooked but also because the density of the wood mass itself can vary.

Incidentally , if yo u order a stere of r eady-to-burn beech firewood as 50 cm split logs from your wood dealer, the dealer is entitled under current law to supply 0.85 m³ of half-metre split logs cut from 1 m³ of metre-length split logs. To avoid any unpleasant surprises, when ordering ask how your dealer measures a stere (if the price is good, you may find 0.85 m³ acceptable).

Estimating your wood requirements

Each kilowatt of heat output requires 0.9 steres of halfmetre split beech logs, or 1.3 steres of split spruce per year.

In other words, 8 steres of half-metre split spruce logs or 5.5 steres of beech will replace 1000 litres of heating oil.

Energy content of one stere of wood in kilowatt hours

Round

logs

fresh-cut

1 m

Round

logs

dry

1 m

Split logs

fresh-cut

1 m

Split

logs

dry

1 m

Split

logs

fresh-cut

50 cm

Split logs

dry

50 cm

Split logs

fresh-cut

33 cm

Split logs

dry

33 cm

Moisture content 30-60% 15% 30-60% 15% 30-60% 15% 30-60% 15%

Softwood

1 stere contains 0.65 m³

1 stere contains 0.56 m³1 stere contains 0.62 m³1 stere contains 0.64

m³ Fir 1205 1269 1038 1093 1149 1210 1186 1249 Spruce 1299 1373 1119 1183 1239 1310 1279 1352 Douglas fir 1402 1478 1208 1274 1337 1410 1380 1455 Pine 1542 1625 1329 1400 1471 1550 1519 1600 Larch 1573 1656 1355 1427 1501 1580 1549 1631 Hardwood

1 stere contains 0.59 m³

1 stere contains 0.50 m³1 stere contains 0.59 m³1 stere contains 0.62

m³ Poplar 958 1020 812 864 958 1020 1007 1072 Willow 1107 1200 938 1017 1107 1200 1163 1261 Alder 1191 1270 1009 1076 1191 1270 1252 1335 Maple 1472 1550 1247 1314 1472 1550 1547 1629 Birch 1475 1570 1250 1331 1475 1570 1550 1650 Ash 1658 1760 1405 1492 1658 1760 1742 1849 Oak 1664 1760 1410 1492 1664 1760 1749 1849 Copper beech 1655 1800 1403 1525 1655 1800 1739 1892 Hornbeam 1743 1920 1477 1627 1743 1920 1832 2018 Black locust 1743 1920 1477 1627 1743 1920 1832 2018

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Low-emission operation

12 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, compliance with the new dust limit value of 20 mg/m³ can lead to proble ms in practice.

It was determined under laboratory conditions in testing centres that the ETA boiler complies with the new limit values. T o 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 EN 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 presen t 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 depends 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 aerosolformers. 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.

Heating water Water hardness

13 Heating water

13.1 Water hardness

Determine permissible water hardness for the heating water according to ÖNORM H 5195-1

Instructions for determination:

1. Divide water content (litres) of the heat producer by its output in kW. If the result is larger than 0.3 l/kW, Table 1 applies. If the value is smaller or equal to

0.3 l/kW, Table 2 applies.

2. Divide the total heating water volume (in litre s) by the output (in kW) of the smallest heat producer. The result is the specific water content and this determines the column within the previously calculated table.

3. Read the data for the permissible water hardness from the respective line using the total output of the heat producer.

Example: A heating system with a 45 kW boiler and 1500 litre total water volume.

1. The ratio of water content to output is more than

0.3 l/kW (117:45=2.6) => Table 1.

2. The specific water content is 33,3 l/kW (1500÷45 =

33.3) => middle column in Table 1.

3. The total output of the boiler is 45 kW; therefore, only the data from the first line (≤ 50 kW) are relevant.

The permissible water hardness in this example is 1 1.2 °dH.

Softening with a salt-regeneration ion exchanger

We recommend softening wa ter with salt-reg eneratio n ion exchangers, just as drinking water is softene d. This method does not remove salt from the water. It replaces the calcium in the lime w ith sodium from the salt, and has considerable advantages. It is cheap and

chemically stable against contamination. In addition, it produces a natural alkalinity that generally results in a sufficiently non-corroding pH value of around 8.

pH value between 8 and 9 may require dosing with trisodium phosphate

If the heating water's pH value has not itself changed to more than 8 after a week of operation, increase it by adding 10 g/m³ of trisodium phosphate (Na

3PO4

) or

25 g/m³ of trisodium phosphate dodecahydrate (Na

.12H2O). Wait another 2-4 weeks before making

further corrections. The pH value must not exceed 9.

No hybrid installations

A disadvantage of salt-regeneration ion exchange is the salt content with its high electrical conductivity, which can lead to electrolytic corrosion, especially of aluminium or galvanized steel. If only steel, brass, gunmetal and copper are used in the heating system and the use of stainless steel is limited to small areas, then no corrosion problems should be expected, even with salty water.

Galvanized and aluminium parts in a heating system are always in danger of corrosion, especially in combination with copper tubing. In practice, this means no hot-galvanized fittings and no mixing of galvanized tubing with copper tubing. There is an illogical exception: galvanized steel tubing combined with boilers or buffer storage tanks made of steel. Presumably , th e uniform zinc layer di ssolves unifo rmly and is dispersed evenly throughout the system without localised corrosion.

Table 1

Heat producer with large (> 0.3 l/

kW) water content

Table 2

Heat producer with small (> 0.3 l/

kW) water content

Specific water content in litre/kW < 20 l/kW

≥ 20 /kW

< 50 l/kW

≥ 50 l/kW < 20 l/kW

≥ 20 l/kW

< 50 l/kW

≥ 50 l/kW

Total output of the heat

producer

≤ 50 kW 16.8 °dH 11.2 °dH 5.6 °dH 11.2 °dH 5.6 °dH 0.6 °dH > 50 kW

≤ 200 kW

11.2 °dH 5.6 °dH 2.8 °dH 5.6 °dH 2.8 °dH 0.6 °dH

> 200 kW ≤ 600 kW

5.6 °dH 2.8 °dH 0.6 °dH 2.8 °dH 0.6 °dH 0.6 °dH

> 600 kW 2.8 °dH 0.6 °dH 0.6 °dH 0.6 °dH 0.6 °dH 0.6 °dH

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Refilling Heating water

Complete desalination not required

If there is no aluminium (heat exchanger in the gas boiler or aluminium radiator) in the system, then costly complete desalination with ion exchange cartridges or osmosis is not required.

Lime stabilisation can be dangerous

The addition of lime stabilising agents prevents limescale. However, we advise against doing this. These agents increase the salt content and result in an undefined pH value. If the system is filled with large amounts of water, exactly the same agent must be used again. Mixing with other water additives or with antifreeze can result in corrosion.

13.2 Refilling

Fill up heating water

If water refilling in the heating system is required, for example to adjust the pressure, the same water as used during initial filling should be used wherever possible.

If only a small amount of water is to be replenished (below 10% the system volume), then normal tap water can be used. This applies, for example, when replacing a pump or mixer.

The heating system is never to be refilled with rainwater , as this is usually contaminate d and the

pH value is too low.

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eta TWIN 20 kW, TWIN 26 kW, SH20kW, SH40kW, SH30kW Operation

Specifications and Main Features

Frequently Asked Questions

User Manual