Wood chip boiler HACK 110-130 kW Operation

Wood chip boiler HACK 110-130 kW Operation

2017-01-30

EN

0000000296

V.003

2.38.0

3205

93610-001

Wood chip boiler HACK

110-130 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 [email protected]

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 Boiler functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 Changing the fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1 Slag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5 Empty the ash box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6 ETAtouch controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.1 Getting to know the control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.1.1 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.1.2 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.1.3 Integrated help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.1.4 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.1.5 Inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.1.6 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.1.7 meinETA remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.2 [Boiler] function block – HACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.2.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.2.2 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6.3 [Buffer] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.3.1 Setting the buffer charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.3.2 Buffer with solar heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.3.3 Buffer as a combination tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6.3.4 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.4 [Hot water tank] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.4.1 Setting the hot water charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.4.2 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.5 [Fresh water module] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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

6.5.2 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.6 [Heating circuit] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

6.6.1 Operating elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.6.2 Setting the heating time slots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.6.3 The heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

6.6.4 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

6.7 [Solar] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

6.7.1 Solar heating system with one tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

6.7.2 Solar heating system with 2 tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.7.3 Solar heating system for buffer with 2 internal coils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

3

6.7.4 Solar heating system with external heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

6.7.5 Solar heating system with external heat exchanger and stratified charging valve. . . . . . . . . . 65

6.7.6 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

6.8 [Aux.boiler] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

6.8.1 Setting the charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

6.8.2 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

6.9 [External heat demand] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

6.9.1 Setting the charging times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

6.9.2 Text menu - Adjustable parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

6.10 [Heating pipeline] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

6.11 Function block [special conveyor] and [external conveyor] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

6.11.1 Intermediate conveyor screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

6.11.2 Double agitator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

6.12 [Agitator] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

7 Filling the storage room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

8 Rectifying problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

9 Information on fuel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

9.1 Suitable fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

9.2 Moist fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.3 Drying and chopping wood chips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.4 Water content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

9.5 Judging the quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

9.6 Other fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

9.7 Heating value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

10 Emission measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11 Low-emission operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

12 Heating water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.1 Water hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.2 Refilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

4 www.eta.co.at

General

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 through 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.

Take advantage of the knowledge and skills of an expert

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

Extended warranty

We grant an extended warranty if the product is commissioned by an authorised partner company or by our own customer service. In this 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 operate your ETA boiler remotely via your own network (VNC Viewer) or the internet <www.meinETA.at> using a PC, smartphone or tablet, as though you were standing right in front of the ETAtouch control system of your

Preface

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

Copyright

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 changes

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 available optionally. In the event of contradictions between individual documents regarding delivery scope, the information in our current 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

Possible effects

• Measures for avoiding the danger

Types of safety instruction

5

Warranty, guarantee and liability

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 fuels

• Wood chips according EN ISO 17225-4:2014, quality classes A1/A2/B1/B2, size P16S-P31S, maximum water content 35% (M35)

• Wood pellets according EN ISO 17225-2:2014, quality class A1, ENplus-A1

• Shavings and swarf briquets according EN

ISO 17225-3:2014, quality classes A1/A2/B

• Miscanthus-wood chips according

ÖNORM C 4000 and C 4001

• In germany: fuel classes 4/5a according

1. BImSchV. Use fuel classes 5/6/7/8 only after consultation with company ETA.

General

Operation with unsuitable fuels, in particular highslag pellets from grain waste, for example, or corrosive fuels such as miscanthus fertilised with potassium chloride, is prohibited.

Ensure supply air is free from aggressive substances

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

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

12

"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.

Install safety valve and thermal relief valve

A safety valve (triggered at 3 bar) as protection against 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.

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.

6 www.eta.co.at

General

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 common standardised parts such as electrical fuses or fastening materials, as long as they possess the required features and do not restrict the functionality 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.

Warranty, guarantee and liability

7

2 Boiler functionality

Boiler functionality

1 Agitator plate

2 Clutch

3 Flat springs

4 Discharge screw

5 Rotary valve

6 Stoker screw

7 Combustion chamber

8 Actuator for primary air

9 Actuator for secondary air

10 Downdraught channel

11 Heat exchanger with turbulators

12 Draught fan

13 Ash screw under tilting grate

14 Heat exchanger ash screw

15 Ash box

8

Spring arms adjust to load

The wood chips are transported to the discharge screw by the floor agitator. The spring arms adjust themselves to the load above them. If the storage room is full, the floor agitator is subjected to a heavy load and the spring arms are pressed against the agitator plate, reducing the force needed to turn the agitator and thus the electricity consumption. As the storage room empties, the spring arms extend toward the wall and clear out the bunker.

Floor agitator must turn during filling

To prevent the spring arms from being stuck in an extended position under the pile of wood chips, the floor agitator must be turning during filling. Details can be found in chapter

7 "Filling the storage room"

.

Discharge screw torque control

The power consumption of the motors is monitored so that any sluggishness in the conveyor screws is registered immediately. This triggers the screws to run briefly in reverse, up to three times if necessary. The floor agitator is simultaneously decoupled via the www.eta.co.at

Boiler functionality clutch so the motor's power is exclusively available for unblocking the screw. Jammed pieces of wood or even stones can be easily loosened this way so fuel transport can resume.

Maximum protection against burn-back

The airtight one-chamber rotary valve keeps the combustion chamber safely separated from the fuel deposit in all operating modes. No hot gas can enter the fuel conveying system and ignition of the wood chips is impossible. This is the most reliable burn-back protection possible. Individual pieces of wood that are too long cannot bring the fuel conveying system to a halt. They are cut off by a hardened blade on the edge of the rotary valve chamber.

Optimised ignition

After short breaks in combustion, the refractory-lined combustion chamber remains hot enough that any new fuel which is fed in can be ignited by the remaining embers. The ignition fan only needs to be activated after long periods without combustion. To save electricity, the ignition fan is deactivated immediately after successful ignition, which is recognised by the lambda probe and exhaust temperature.

Hot combustion chamber with tilting grate

The wood chips are pushed onto the side of the grate by the stoker screw. A refractory-lined combustion chamber ensures a clean fire with high burnout temperature. At intervals that depend on the output level, the grate is tilted by 90° after a controlled ember burnout in order to automatically remove ash and foreign bodies from the combustion chamber. Until the next time the grate is tipped, the ash remains under the grate and can burn out before it is transported by the ash screw to the detachable ash box.

Combustion breaks with minimal heat loss

The fire can be regulated between minimum and maximum output. In autumn and spring, when heating loads are smaller, the output is regulated by pauses in combustion. To avoid a build-up of smouldering tar in the boiler and chimney during these pauses, the fire undergoes a controlled burnout. Closing the primary and secondary air flaps ensures that no air can flow through the boiler in standby, thus preventing unused heat from being drawn into the flue.

Optimum fuel efficiency with lambda control

Gasification of the wood (output) can be controlled via the flow of primary air. Through use of the lambdacontrolled secondary air, combustion is kept clean and highly efficient.

A lack of air means there is not enough oxygen for complete combustion. On the other hand, too much air also results in incomplete combustion as it cools the fire. Below 700°C, not all of the wood gas is burned.

Excessive air also draws too much heat out of the boiler unused. The lambda probe ensures optimum combustion and maximum fuel utilisation in everyday operation.

Turbulent heat exchanger with cleaning

After complete combustion, the hot gas flows into the cold section of the boiler, where it transfers its heat to the boiler water. First it flows smoothly through a downdraft channel for ash sedimentation and then turbulently through the heat exchanger tubes, which are equipped with turbulators. The more turbulent the flow, the more the gas comes into contact with the tube walls, thus ensuring maximum transfer of heat to the boiler water. This ensures low exhaust temperatures and high efficiency.

During cleaning (grate tipping) the turbulators are also moved to scrape the flue ash from the heat exchanger tubes. The ash is transported to the ash box by an ash screw.

Underpressure for maximum safety

A draught fan at the boiler outlet causes underpressure throughout the boiler, thus ensuring high operational safety without risk of deflagration and burn-back. The airtight one-chamber rotary valve makes the usual combustion air fan unnecessary. The required air is drawn into the combustion chamber through the regulated primary and secondary air flaps as a result of the underpressure within the boiler.

9

General information

3 Safety

3.1

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 children away from the fuel store and storeroom

In fuel stores for wood chips, in particular, there is a danger that a hollow space may form above the agitator. Children playing on the pile of wood chips, or careless adults, could fall in and get buried or caught up in the discharge screw.

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.

Safety

Storage of ash

The ash must be kept in non-flammable containers with covers for cooling. Never put hot ash into the waste bin!

3.2

Safety devices

Pump safety run, automatic heat dissipation at overtemperature

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

This action prevents the boiler temperature from rising further and triggering further safety devices such as the safety temperature limiter and the thermal relief valve.

The heat dissipation is limited by the maximum flow temperature set in the heating circuits and the target hot water temperature.

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

Fig. 3-1: Fire extinguisher

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.

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Safety overheating if the pump fails. The minimum pressure in the cold water pipe must be 2 bar and the temperature must not exceed 15 °C.

Safety devices

Install safety valve against overpressure

A safety valve with 3 bar opening pressure must be installed on the boiler. Every heat producer in a heating system must be protected by at least one safety valve against pressure exceeding the maximum operating pressure (see EN 12828). These valves must be designed such as to ensure the maximum permitted operating pressure that can arise in the heating system or parts thereof. The safety valve must be situated in the boiler room and be easily accessible.

Fig. 3-2: 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. To prevent the supply line from being shut off accidentally, remove the levers from ball valves or the hand wheels from valves and hang them there with a piece of wire.

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 must be installed on the boiler. With a generously dimensioned air vessel, enough water for cooling will come even if there is a power failure. 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, the power supply to the draught fan and the fuel intake is interrupted. If the boiler temperature decreases below 70°C again, the safety temperature limiter can be manually released for a restart of the boiler.

Fig. 3-3: Safety valve

DANGER!

Do not install any shut-off valves, strainers or such like between the boiler and the safety valve.

The connection size of the safety valve is determined on the basis of the heating system's maximum heating capacity, as shown in the table.

Valve size a

Nominal diameter (DN)

Maximum heating capacity (kW)

15 (G ½)

20 (G ¾)

50

100

25 (G 1)

32 (G 1 ¼)

40 (G 1 ½)

50 (G 2)

200

300

600

900

a. The valve size is determined by the size of the inlet connection.

Install the safety valve at the highest point of the heat producer or in the flow pipe close to the heat producer.

Only in this way can it discharge heat by blowing out hot water and steam.

The safety valve may be installed in any position, but the upper part of the valve must not face downward.

The flow pipe may be 1 m long maximum and must be routed in a straight line in the nominal diameter of the valve inlet.

11

Safety devices

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 discharge (vent) pipe must have at least the same nominal diameter as the valve outlet, have a consistent downhill gradient and be routed to a sewer connection. The vent pipe may contain a maximum of 2 bends and be 2 m long. If a length of more than 2 m is required, the next size of pipe must be selected. More than 3 bends and

4 m of length are not permitted. The mouth of the vent pipe must allow easy inspection and be routed such as to exclude any danger to persons. If the vent pipe ends above a funnel, its discharge pipe must have a diameter at least double that of the valve inlet.

Safety

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Changing the fuel

4 Changing the fuel

WARNING!

Switch off the electricity to the boiler via the mains switch

 Switch off the electricity to the boiler via the mains switch. This prevents injuries caused by switching the boiler on inadvertently.

Setting the firebed level sensor

The better the fuel, the smaller the amount needed on the tilting grate. Therefore, when the fuel is changed, the position of the firebed level sensor must also be changed. The sensor is located behind the cover on the front of the boiler.

The settings for the various fuels are provided

under 4.2 "Settings"

.

To do so, remove the maintenance cover for the flue gas recirculation by loosening the two wing nuts while taking care not to damage the seal.

Fig. 4-2: Removing the maintenance cover

Enable flue gas recirculation by taking out the shut-off plug and fastening it to the boiler so it cannot be lost.

Fig. 4-1: Firebed level sensor

To adjust the position, loosen the screw, turn the firebed level sensor and fix it in place with the screw.

Enable flue gas recirculation for pellets and miscanthus

For very dry fuels such as pellets, carpentry waste, miscanthus or wood chips with water content under

15%, the optional flue gas recirculation is needed in order to lower the combustion temperature.

Flue gas recirculation must be enabled for the fuels mentioned above. This is done by removing the shut-off plug.

Fig. 4-3: Shut-off plug

Inspect the seals on the maintenance cover and the shut-off plug and replace them if necessary.

Replace the maintenance cover and tighten it evenly.

13

Slag

When using wood chips with less than 15% water content, enable flue gas recirculation and manually set [Flue gas recirculation] to [Yes] in the control system; see

6.2.2.2 "Flue gas recirculation" .

For wood chips with more than 15% water content, flue gas recirculation remains disabled.

Setting the fuel type in the control system

The control system provides a selection of different fuels. For each one different values are stored for the combustion and de-ashing. If the fuel is changed, the new fuel must also be set in the control system. If the water content and density are known, these parameters must also be adjusted. Changing the fuel, density and water content in the control system is described in chapter

6.2.2.1 "Fuel"

.

4.1

Slag

What is slag?

Slag is liquified ash of combusted fuel. Liquefaction occurs when the combustion temperature in the boiler reaches the ash melting point of the fuel.

Slag clogs the openings in the grate and prevents the flow of air. As a result, the combustion temperature increases, which further promotes the formation of slag. This causes increased wear of the combustion chamber, the grate, and its de-ashing parts as well as faults and unnecessary additional maintenance demands.

How does slag form?

The ash melting point of wood is approximately 1100

°C. The combustion temperature of the boiler (with good quality wood chips) is approximately 900 °C.

Since the combustion temperature is lower than the ash melting point of the fuel, no slag will form.

The ash melting point of miscanthus and impurities like needles, leaves, soil, dirt, and rotten fuel is approximately 800 °C. Therefore, a high level of impurities will lead to the formation of slag.

Optional flue gas recirculation is one way to avoid the formation of slag. Flue gas recirculation directs a portion of the flue gas back into the combustion chamber, reducing the combustion temperature. As a result, the ash melting point of the fuel is no longer reached, greatly reducing the formation of slag.

Causes of slag

The causes of slag can be divided into the following categories:

Changing the fuel

Characteristics of the fuel

• Wood chips and miscanthus containing a high level of ash, contaminants (soil, sand, stones), a high proportion of bark or leaves and needles.

• Pellets and bark pellets that contain a high proportion of ash.

Improper operation and maintenance of the boiler.

• Leaks in the boiler caused by improperly sealed maintenance openings.

• Unsealed Lambda probe, defective seals on the ash box, flue gas recirculation.

• Boiler and flue gas recirculation not regularly cleaned, or flue gas recirculation does not work due to high flue draught.

Incorrect control system settings

• Incorrect fuel settings

• De-ashing interval too long.

slag.

Generally speaking, the darker the wood chips, the higher the proportion of dirt that will cause

When the fuel causes slag

If pieces of slag are found in the ash box, then this is usually caused by the fuel's ash content. Therefore, the boiler must be de-ashed more often. This is done by shortening the de-ashing interval; see page

34

.

An excessive flue draught can also cause slag by reducing the effectiveness of the flue gas recirculation.

If the flue draught is over 15 Pa, a draught limiter is required, or a nozzle on the chimney opening with which higher exit velocities and better lift for the flue gas are achieved.

Remedies for slag

If slag appears, the following measures can be used as remedies:

• Shorten the de-ashing interval by 50%. See chapter

6.2.2.3 "Boiler de-ashing interval"

.

• Raise the residual oxygen content O

2

. See chapter

6.2.2.6 "Increase O2 target value"

.

• Install flue gas recirculation on the boiler

• Check the position of the firebed level sensor. See chapter

4.2 "Settings" .

In any case, the de-ashing interval must be adjusted. As an additional measure, the residual oxygen content can be briefly raised. However, if would be preferable to change the fuel or to retrofit the optional flue gas recirculation in order to sustainably lower the combustion temperature.

14 www.eta.co.at

Changing the fuel

4.2

Settings

Settings

15

Changing the fuel

Adaptations for

HACK 110-130 kW

Fuel Pellets

Water content

Ash/dust content low

< 15% high

[Pellets] Software parameters [Fuel]

Firebed level sensor

Position

De-ashing interval (boiler with buffer storage tank)

[De-ash after min.]

Software parameters

[De-ash after max.]

De-ashing interval (boiler without buffer storage tank)

Software parameters

[De-ash after min.]

[De-ash after max.]

Boiler with flue gas recirculation installed

90 kg

150 kg

90 kg

2

32 kg

113 kg

64 kg

low

< 15%

45 kg

100 kg

high

12 kg

50 kg

45 kg 23 kg

150 kg 113 kg 100 kg 50 kg

4

Wood chips

15 - 25% low

45 kg

100 kg

45 kg

100 kg

high

[Woodchips]

12 kg

50 kg

23 kg

50 kg

25 - 35% low

45 kg

100 kg

45 kg

100 kg

5

high

12 kg

50 kg

36 kg

50 kg

Software parameters [Flue gas recirculation]

Flue gas recirculation status

[Yes]

Open

[Yes]

Open

[Yes]

(recommended)

Open

(recommended)

[Yes]

Open

[No]

Closed

Boiler without flue gas recirculation

Software parameters [Flue gas recirculation]

a. Reduced max. output: 90 kW

[No]

Carpentry material Miscanthus a low

< 15% high

< 20% low high

[Woodchips] [Miscanthus]

23 kg

100 kg

45 kg

100 kg

4

[Yes]

Open

12 kg

50 kg

23 kg

50 kg

3 kg

19 kg

7 kg

19 kg

5

3 kg

15 kg

7 kg

15 kg

[Yes]

Open

16

Empty the ash box

5 Empty the ash box

Stop heating

End the boiler's heating mode with the On/Off switch

in the boiler overview window. The boiler performs an ember burnout and then changes to

[Switched off] mode. Press the [De-ash] button to make the boiler perform a final de-ashing.

Remove excess ash from secondary combustion chamber

Open the combustion chamber door and use the poker to scrape the excess ash into the combustion chamber.

Open both lateral fasteners by pressing their safety catches in the direction of the arrow. Remove the ash box from the boiler.

The ash in the secondary combustion chamber may not be steeper than 45°.

To remove this ash, initiate boiler de-ashing by pressing the [De-ash] button.

Empty the ash box, inspect the seals

Use the two sight glasses to check the fill level of the ash box without opening it.

Close the covers on the ash box and fasten them with the wing nuts.

Fig. 5-2: Covers

Fig. 5-1: Sight glasses

17

Open the fasteners on the lid and empty the ash box.

Empty the ash box

Inspect the integrity of the ash box seals on the boiler, replace them if necessary.

Fig. 5-3: Check ash

If there are large pieces of slag in the ash, the combustion chamber and the tilting grate must be checked and the de-ashing interval reduced, if necessary.

Inspect the integrity of the seal on the ash box lid, and replace it if necessary.

Fig. 5-5: Seal

Attaching the ash box to the boiler

Reattach the cover of the ash box and secure with the fasteners. Then re-open the covers.

Fig. 5-6: Covers

Push the ash box over the connection on the boiler and attach it to the boiler with the fasteners.

Fig. 5-4: Seal

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Empty the ash box

Switching on the boiler

Switch the boiler back on with the On/Off switch.

19

Getting to know the control system

6 ETAtouch controller

6.1

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

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

Fig. 6-1: 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

6.1.3

"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 6.1.7 "meinETA remote control"

9 System configuration

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ETAtouch controller

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.

Getting to know the control system

6.1.1

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 selecting .

symbol (upper left) and then

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. 6-2: Selection of views

1 User interface

2 Text 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

6.1.1 "User interface" .

The parameters of a function block are displayed in the text menu and can be

menu"

. adjusted,if necessary, see chapter

6.1.2 "Text

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, pumps and mixers can be started in manual mode. This menu is intended for

specialists only. Details can be found in chapter 6.1.5

"Inputs and outputs"

.

Any hints, errors or faults are displayed in the

messages menu, see chapter 6.1.4

"Messages" .

Fig. 6-3: Heating circuit user interface

1 Operating condition and information

2 Producer for the heating circuit.

Currently, the buffer 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 temperatures settings

7 Different operating modes of the heating circuit

21

Getting to know the control system

6.1.2

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. 6-4: 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.

ETAtouch controller

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 you 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.

6.1.3

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. 6-6: Activated help in the user interface

Fig. 6-5: Settings window

1 Factory setting and adjustment range

2 Reset to factory setting

3 Save and close

4 Cancel and close

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ETAtouch controller

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.

Getting to know the control system

6.1.4

Messages

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. 6-7: 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. 6-8: Activate help in the text menu

To disable help, press the button again.

Fig. 6-9: Symbols when an error occurs

Types of errors and their meaning

Notification

A notification does not interrupt operation, and therefore no acknowledgement is required. 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.

23

Getting to know the control system

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

ETAtouch controller

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. 6-10: 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. 6-12: 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. 6-11: 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 .

6.1.5

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.

Fig. 6-13: 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.

24 www.eta.co.at

ETAtouch controller

6.1.6

6.1.6.1

Getting started

System settings

Open the system configuration

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

Getting to know the control system

6.1.6.2

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. 6-14: 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. 6-16: Setting the language

Select the desired language. Following this, the

ETAtouch control system will appear in the chosen language.

6.1.6.3

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. 6-15: System configuration menu

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

Fig. 6-17: Date and time

25

Getting to know the control system

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 are closed by tapping the symbol.

6.1.6.4

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.

ETAtouch controller

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

Fig. 6-18: Function block settings

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

Fig. 6-20: On-screen keyboard

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

6.1.6.5

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.

Fig. 6-19: Overview of the settings menu

26 www.eta.co.at

ETAtouch controller

In the user interface, producers for the function block are always displayed on the left side and consumers on the right side.

Getting to know the control system

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. 6-21: 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. 6-23: Open the settings

2. Access the charge times of a particular day with the [Charging times Daily plan] button.

Fig. 6-24: Access charging times

Fig. 6-22: Selection window

The symbols for both producers and consumers vary between the function blocks.

6.1.6.6

Setting a time window

Setting the charging and operation times

In some function blocks, the time window for charging the tank (for example the buffer and hot water tank), 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.

27

Getting to know the control system

3. An overview screen opens.

ETAtouch controller

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. 6-25: 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.

Fig. 6-26: 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. 6-27: 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.

28 www.eta.co.at

ETAtouch controller

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.

Getting to know the control system

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

Fig. 6-28: 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. 6-29: 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. 6-30: Select days of the week

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

29

Getting to know the control system

6.1.7

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.

ETAtouch controller

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.

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. 6-32: 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. 6-31: 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.

30

Fig. 6-33: 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 www.eta.co.at

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

Getting to know the control system

Fig. 6-34: 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 platform

"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.

31

[Boiler] function block – HACK

6.2

[Boiler] function block – HACK

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 and return temperature

3 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.

4 [De-ash] button.

An additional boiler de-ashing is started.

5 Boiler On/Off switch.

= switched on

= switched off

6 [Measurement] button.

The menu for emission measurement of the boiler is opened.

7 [Settings] button.

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

8 Optional external boiler de-ashing.

This is only displayed if it has been installed. When de-ashing, a line appears and the symbol is displayed in yellow.

9 Special conveyor for the boiler.

This is only displayed if a special conveyor for the boiler has been installed.

ETAtouch controller

Boiler functionality

If the boiler is turned on ( ), it will be in standby mode ([Ready] mode). If there is a request from a connected consumer (for example, buffer, heating circuit or hot water tank), the heating mode starts automatically. Once the heat is delivered to the consumer, a yellow line appears beside the flow temperature and the symbol of the consumer in the overview.

If there is no heat demand, the heating operation is completed upon burnout. The operating condition changes to [Ember burnout] and then back to standby.

Boiler de-ashing takes place automatically within an

adjustable interval. See chapter 6.2.2.3 "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

6.2.2.4 "Setting the idle time for heat exchanger de-ashing"

.

The control system issues a reminder to empty the ash box after a set quantity of fuel has been consumed. If the ash box is only partially full, this quantity can be

increased. See chapter 6.2.2.5 "Empty ash box after"

.

6.2.1

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-ashing only after this. If the boiler is switched off or on standby, 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

32 www.eta.co.at

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

Fig. 6-35: 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 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 .

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

6.2.2

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.

[Boiler] function block – HACK

Adjustable parameters

Boiler

Settings

Fuel

Flue gas recirculation

Ash removal

De-ash after min.

De-ash after max.

Begin idle time WT cleaning

Idle time during WT cleaning

Empty ash box after

Residual O2

Increase O2 target value

Detailed descriptions of the parameters are provided below.

6.2.2.1

Fuel

Explanation of [Fuel]

This parameter sets the type of fuel used. The control system contains appropriate values for each type of fuel, to ensure optimum combustion and de-ashing.

The parameter can be found under:

Boiler

Settings

Fuel

If the fuel is set to [Pellets] or [Miscanthus], the setting for flue gas recirculation is automatically changed to [Yes].

If the fuel is [Woodchips], the [No] setting is made automatically.

If you know the water content and density of the fuel you are using, you must also adjust these two parameters. You can find them in the same submenu.

6.2.2.2

Flue gas recirculation

Explanation of [Flue gas recirculation]

When the fuel setting is changed in the control system, the status of the flue gas recirculation is adjusted automatically.

If the fuel is set to [Pellets] or [Miscanthus], the setting for flue gas recirculation is changed to

[Yes].

If the fuel is [Woodchips], the setting is [No].

33

[Boiler] function block – HACK

However, if wood chips with less than 15% water content are used, the [Yes] setting must be made manually.

The parameter can be found under:

Boiler

Settings

Flue gas recirculation

6.2.2.3

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.

Different fuel qualities require different de-ashing intervals. This is why the de-ashing interval needs to be adjusted.

The parameters can be found under:

Boiler

Ash removal

De-ash after min.

De-ash after max.

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

6.2.2.4

Setting the idle time for heat exchanger de-ashing

Explanation of [Begin idle time WT cleaning] and

[Idle time during WT cleaning]

The [Idle time during WT cleaning] parameter is used to select the duration of the idle time for heat exchanger de-ashing. The start time for the idle time is set with the [Begin idle time WT cleaning] parameter.

The idle time should be kept as short as possible.

The parameters can be found under:

Boiler

Ash removal

Begin idle time WT cleaning

Idle time during WT cleaning

6.2.2.5

Empty ash box after

Explanation of [Empty ash box after]

This parameter is used to set the amount of fuel to be consumed before a reminder to empty the ash box is displayed on the screen.

ETAtouch controller

If the value is set to 0 kg, this reminder will not appear.

The parameter can be found under:

Boiler

Ash removal

Empty ash box after

6.2.2.6

Increase O2 target value

Explanation of [Increase O2 target value]

The residual oxygen content of the flue gas increases as a result. This is required when using an extremely dry fuel and slag forms in the boiler. The set point is increased based on the water content of the fuel. The following guideline values apply:

Water content of wood chips

< 15%

15 - 25%

> 25%

Increase by

1.5 - 2.0%

0.5 - 1.0% no increase

If a fuel with water content greater than 25% is used, this parameter must be reset to 0%.

The parameter can be found under:

Boiler

Residual O2

Increase O2 target value

34 www.eta.co.at

ETAtouch controller [Boiler] function block – HACK

35

[Buffer] function block

6.3

[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.

ETAtouch controller

Mode of operation

In the settings menu ( button), the time window for buffer charging can be set, and therefore the charge

times (see chapter 6.3.1 "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 [Buffer top min.]. The consumers connected to the buffer (for example, heating circuit or hot water tank) can also request 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.

36 www.eta.co.at

ETAtouch controller

6.3.1

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.

[Buffer] function block

6.3.2

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 6.7 "[Solar] function block"

.

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

Fig. 6-36: 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

6.1.6.6

"Setting a time window" .

Fig. 6-37: Solar heating system on buffer

1 Currently, the buffer is charged 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 6.3.4.9 "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

37

[Buffer] function block displayed twice, and the additional buffer temperatures for solar stratified charging are displayed next to the buffer.

ETAtouch controller

6.3.3

Buffer as a combination tank

Buffer with integrated hot water tank or coils

38

Fig. 6-38: Stratified charging of the buffer

Fig. 6-39: 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 (see chapter 6.3.3.1 "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

6.3.4.12 "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 .

6.3.3.1

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 the set temperatures can be adjusted in the settings ( button).

To adjust, open the settings and then open the www.eta.co.at

ETAtouch controller charging times of any given day with the [Hot water

Charging times Daily plan] button. An overview screen opens.

[Buffer] function block

Fig. 6-40: 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

6.1.6.6

"Setting a time window" .

39

[Buffer] function block

6.3.4

Text menu - Adjustable parameters

Adjustable parameters

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

Buffer

Buffer top

Buffer top min.

Buffer bottom

Buffer bottom off

Extra charge

Buffer top min.

Buffer bottom off

Extra charging from

Chrg. button

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

Buffer

Solar heat diss.

a

Activate?

...until buffer max

Buffer top Solar b

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 c

ETAtouch controller

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

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

Hot water tank

Switch-on diff.

Circulation

Circulation runtime

Circulation pause

Enable circulation

Detailed descriptions of the parameters are provided below.

6.3.4.1

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:

Buffer

Buffer top

Buffer top min.

6.3.4.2

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.

40 www.eta.co.at

ETAtouch controller

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:

Buffer

Buffer bottom

Buffer bottom off

6.3.4.3

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 [Buffer 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 temperatures is set to "0".

The parameters can be found under:

Buffer

Extra charge

Extra storage activated?

Buffer top min.

Buffer bottom off

Extra charging from

Chrg. button

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].

6.3.4.4

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

[Buffer] function block

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:

Buffer

Solar heat diss.

Activate?

...until buffer max

6.3.4.5

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 priority means that this section will be charged by the solar heating system first. A low priority means that it will be charged last.

The priority for the top and bottom section of the buffer can be found under:

Buffer

Buffer top Solar

Priority

Buffer bottom Solar

Priority

6.3.4.6

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 temperature only applies 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 top Solar

Buffer top min. solar

41

[Buffer] function block

6.3.4.7

Min. out. temp. Solar prio.

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

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

The parameter can be found under:

Buffer

Buffer top Solar

Min. out. temp. Solar prio.

or also in:

Buffer

Buffer bottom Solar

Solar priority

Min. out. temp. Solar prio.

6.3.4.8

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] temperature, the solar pump of the solar heating system is switched off.

The parameter can be found under:

Buffer

Buffer bottom Solar

Buffer bottom max

6.3.4.9

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 the

[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.

ETAtouch controller

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:

Buffer

Buffer bottom Solar

Solar priority

Begin solar prio.

Change priority at

End solar prio.

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

Switch function on or off

The parameter can be found under:

Buffer

Buffer bottom Solar

Solar priority

Solar priority

6.3.4.10

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 the 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.].

42 www.eta.co.at

ETAtouch controller

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

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

The [Solar heat diss.] parameter can be configured in the text menu of the hot water tank or the heating circuit.

The parameters can be found under:

Buffer

Buffer bottom Solar

Extra solar heat from outside temp.

at buffer top at buffer bottom sol.

6.3.4.11

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:

Buffer

Priority

6.3.4.12

Switch-on diff.

Explanation of [Switch-on diff.]

Optional: only with combination tank

With a combination tank, this parameter regulates how far the current warm water temperature can fall before the hot water tank again demands heat from the 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 combination tank does not demand heat from the boiler unless this happens.

With a combination tank, this value can be set to approximately 5°C to 8°C if the amount of hot water is insufficient.

The parameter can be found under:

Hot water tank

Switch-on diff.

[Buffer] function block

6.3.4.13

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:

Hot water tank

Circulation

Circulation runtime

6.3.4.14

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:

Hot water tank

Circulation

Circulation pause

6.3.4.15

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

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

43

[Buffer] function block

The parameter can be found under:

Hot water tank

Circulation

Enable circulation

ETAtouch controller

44 www.eta.co.at

ETAtouch controller [Buffer] function block

45

[Hot water tank] function block

6.4

[Hot water tank] function block

Hot water tank overview screen

ETAtouch controller

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].

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 6.4.1 "Setting the hot water charging times"

.

46 www.eta.co.at

ETAtouch controller

6.4.1

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. 6-41: 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

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

6.1.6.6

"Setting a time window" .

[Hot water tank] function block

6.4.2

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

Hot water tank

Switch-on diff.

HW bottom off a

Solar heat diss.

b

Priority c

Circulation d

Circulation runtime

Circulation pause

a. Only visible with additional temperature sensor b. Only visible for buffers with solar heating system c. Only visible for solar heating systems with switchover between several tanks d. Only visible with additional circulation pump

Detailed descriptions of the parameters are provided below.

6.4.2.1

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:

Hot water tank

Switch-on diff.

6.4.2.2

HW bottom off

Explanation of [HW bottom off]

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

47

[Hot water tank] function block

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:

Hot water tank

HW bottom off

6.4.2.3

Solar heat diss.

Explanation of [Solar heat diss.]

Optional: only for accumulator tanks with solar heating system

This parameter defines whether the hot water tank may take excess solar heat from the buffer.

If this parameter is set to [Yes], the hot water tank takes the solar excess up to the maximum 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:

Hot water tank

Solar heat diss.

6.4.2.4

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:

Hot water tank

Priority

6.4.2.5

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.

ETAtouch controller

The parameter can be found under:

Circulation

Circulation runtime

6.4.2.6

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 after this time has elapsed. This pause is only valid inside the set time slot.

The parameter can be found under:

Circulation

Circulation pause

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ETAtouch controller [Hot water tank] function block

49

[Fresh water module] function block

6.5

[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.

ETAtouch controller

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 6.5.1 "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.

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ETAtouch controller

6.5.1

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).

To adjust, open the settings and then open the standby times of any given day with the [Stand-by times

Daily plan] button. An overview screen opens.

Fig. 6-42: 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

6.1.6.6

"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 accessed via the settings with the [Circulation times Daily plan] button.

[Fresh water module] function block

6.5.2

Text menu - Adjustable parameters

Adjustable parameters

Hot water

Automatic venting

Emergency operation only with buffer pump

Circulation

Self-learning

Circulation runtime

Circulation pause

Detailed descriptions of the parameters are provided below.

6.5.2.1

Function Automatic venting

Explanation of [Automatic venting]

This function attempts to remove introduced air from the fresh water module automatically.

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

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

The parameter can be found under:

Hot water

Automatic venting

6.5.2.2

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

Emergency operation only with buffer pump

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[Fresh water module] function block

6.5.2.3

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:

Circulation

Self-learning

6.5.2.4

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:

Circulation

Circulation runtime

6.5.2.5

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

Circulation pause

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ETAtouch controller

ETAtouch controller [Fresh water module] function block

53

[Heating circuit] function block

6.6

[Heating circuit] function block

Overview of the heating circuit when a room sensor is installed

ETAtouch controller

Overview of the heating circuit without a room sensor

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

Fig. 6-43: 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 temperatures settings

7 Operating mode [Timer]

8 Operating mode [Set-back]

9 Operating mode [Heating]

Fig. 6-44: 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

6.6.3 "The heating curve" ), the optional room

sensor and the time window settings (see chapter

6.6.2 "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 6.6.1 "Operating elements"

.

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ETAtouch controller

6.6.1

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 and then turned back on.

[Heating] button

Thus, the heating circuit is manually 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 manually 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 arrows are used to set the required room temperature. In heating mode, an increase of 1 °C causes 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.

[Heating circuit] function block

6.6.2

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 settings ( 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. 6-45: 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

6.1.6.6

"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.

55

[Heating circuit] function block

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

ETAtouch controller

6.6.3

The heating curve

Description of the heating curve

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

The heating curve is 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. 6-46: Holiday function

1 Start of the period

2 End of the period

Tap 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 check the set heating limit for reduced-temperature mode (see chapter

6.6.3.2

"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.

Fig. 6-47: 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.

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ETAtouch controller

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).

[Heating circuit] function block

When should the heating curve be adjusted?

If the rooms are not warming up, you should check the following points first before changing the heating 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. 6-48: 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 off. The same applies to reduced-temperature mode 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.

Fig. 6-49: 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

6.6.1 "Operating elements"

) or the heating curve needs to be adjusted (see

6.6.1 "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. 6-53: "Adjust reduced operation mode"

.

• Check the adjusted heating limits in the control

system, see chapter 6.6.3.2 "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.

57

[Heating circuit] function block

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.

ETAtouch controller

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 demand of the building and each room. Explore this in consultation with your heating contractor or ETA customer service.

Fig. 6-50: ETA room sensor

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

–[Room effect], see chapter

6.6.4.1 "Room effect"

–[Switch-on diff. room] and [Switch-off diff.

room] see chapter

6.6.4.2 "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. 6-51:

"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. 6-53: "Adjust reduced operation mode" .

Check the heating time settings

• Check the heating time settings in the control

system, see chapter 6.6.2 "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] and [Flow 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 6.6.1 "Operating elements" .

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ETAtouch controller

6.6.3.1

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.

[Heating circuit] function block

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. 6-52: Adjust heating curve (at outdoor temperatures below freezing)

Outside the heating times, the 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. 6-51: Adjust heating curve (at outdoor temperatures above freezing)

Fig. 6-53: 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.

59

[Heating circuit] function block

6.6.3.2

Setting the heating limits

Specifying the heating limits for the heating 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 temperature (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.

ETAtouch controller

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. 6-55: Heating limit for reduced-temperature mode

Fig. 6-54: Heating threshold for heating mode

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ETAtouch controller

6.6.4

6.6.4.1

Text menu - Adjustable parameters

Room effect

Explanation of [Room effect]

Optional: only for room sensor

The flow temperature is calculated on the basis of the heating curve and the outside temperature. If the room 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:

Heating circuit

Room

Room effect

6.6.4.2

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 the 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

Switch-on diff. room

Switch-off diff. room

[Heating circuit] function block

61

[Solar] function block

6.7

[Solar] function block

Overview of the solar heating system

ETAtouch controller

6.7.1

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.

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 speed 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.

Fig. 6-56: Solar heating system connected to buffer

temperature that is higher than the current tank temperature by the configurable offset [Target collector diff.].

The speed of the collector pump is controlled in such a way that the collector supplies a

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.

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ETAtouch controller

6.7.2

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.

[Solar] function block

6.7.3

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 temperature in the top part of the buffer, so that the boiler does not have to start for hot water charging.

Fig. 6-57: Solar heating system for the buffer and hot water tank

If the solar power is not sufficient for charging the tank with the highest priority (collector is only warmer by the difference [Switch-off diff.] than the tank that currently requires charging), the tank with the next highest priority is charged after the minimum time has elapsed

(factory setting 20 minutes).

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

Uniform charging of tanks without consideration of individual priorities is also possible. 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.

Fig. 6-58: 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 [Buffer target solar] is provided to control switching. The target temperature is determined by referencing current requirements or minimum temperatures and can be viewed in the buffer's text menu under:

Buffer

Buffer top Solar

Buffer target solar

The conditions for solar charging into the upper 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 6.3.4.7 "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.

63

[Solar] function block

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.

ETAtouch controller

6.7.4

Solar heating system with external heat exchanger

Solar heating system with external heat exchanger

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

6.7.1 "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. 6-59: Solar heating system with external heat exchanger connected to buffer

In addition, a variable speed secondary pump is available for the heat exchanger. Through speed adjustment, it attempts to adapt the temperature difference between collector and secondary 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).

64

Fig. 6-60: Regulation principle

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ETAtouch controller

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.

[Solar] function block

6.7.5

Solar heating system with external heat exchanger and stratified charging valve

Solar heating system with external heat exchanger 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. 6-61: 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 temperature in the upper buffer 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 6.7.3 "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. 6-60: "Regulation principle"

.

The only difference is the switching of solar charging from the lower buffer coil to the upper. If the conditions for solar charging into the upper coil 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 drops 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

6.7.6

6.7.6.1

Text menu - Adjustable parameters

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-heat the tank even when there is little sunlight. The optimal range is between 30 °C and 50 °C.

The parameter can be found under:

State

Collector

Collector min

6.7.6.2

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 solar heating 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 pump

Target collector diff.

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ETAtouch controller

ETAtouch controller [Solar] function block

67

[Aux.boiler] function block

6.8

[Aux.boiler] 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 Boiler temperature

3 Boiler consumers.

Currently, the consumer is charged by the burner at a flow temperature of 64 °C.

4 Enabling or locking the boiler.

= burner is enabled

= burner is locked

5 [Settings] button.

In this menu, the standby time of the burner can be adjusted.

Enabling or locking the boiler

This allows the burner for the ETA control system to be enabled or disabled. If the burner is enabled ( setting), the ETA control system can activate it when needed, but only within the configured times of operation. In the

setting, the auxiliary boiler is locked and the

ETA control system cannot put the burner into operation.

Various tasks of the auxiliary boiler

An additional burner (oil or gas) in the heating system serves either to cover peak loads in the heating system, or as fail-safe for the main heat producer (for example: boiler or another buffer).

ETAtouch controller

Auxiliary boiler to cover peak loads:

• This auxiliary boiler has a separate charging pump and can supply the consumer (e.g. buffer) with heat at the same time as the main heat producer

(e.g. boiler).

In heating systems with a buffer, the burner is only put into operation if the buffer requests a capacity that is higher than that of the ETA heating boiler.

For heating systems without a buffer, the burner is only put into operation when the ETA heating boiler does not reach the required output.

The burner charge pump is started by the ETA control system if the burner temperature is higher than the enabling temperature of the charging pump [Enable AuxBoilChargePump]. In addition, the auxiliary boiler temperature must be greater than the temperature of the consumer to be charged by at least the configured [Thermostat diff.] difference.

Aux. boiler as fail-safe for the main heat producer:

• Through the changeover valve between main heat producer and aux. boiler, the consumers are supplied either by the main heat producer or the aux. boiler. If the main heat producer is switched off or a malfunction is present, the changeover valve changes to the aux. boiler to meet the heat requirements of the consumer.

Switching from one heat producer to another only happens when the temperature of the auxiliary boiler exceeds the configured enabling temperature [Enable diverter valve] of the changeover valve. Only then does the changeover valve route the heat from the hotter heat producer to the consumers.

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ETAtouch controller

6.8.1

Setting the charging times

Open the overview screen of the standby time settings

The standby times of the burner can be adjusted in the settings ( button). To adjust, open the settings and then open the standby times of any given day with the

[Stand-by times Daily plan] button. An overview screen opens.

[Aux.boiler] function block

The parameter can be found under:

Aux.boiler

Settings

Start lag

Fig. 6-62: 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 Period of the time window

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

6.1.6.6

"Setting a time window" .

6.8.2

Text menu - Adjustable parameters

6.8.2.1

Start lag

Explanation of [Start lag]

This parameter is used to set the duration of a delay in the operation of the auxiliary boiler after the ETA control system has demanded it.

If there is still a demand by the ETA control system after this period ends, then the auxiliary boiler will begin operation.

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[External heat demand] function block

6.9

[External heat demand] function block

External heat demand overview

With this function block, an external control system can demand heat from the ETA heating system.

ETAtouch controller

The pump for charging the external heat consumer only starts when the temperature available from the heating system is higher than the adjustable enable temperature [Enable temperature]; see

6.9.2.1 "Enable temperature" .

If the external heat consumer is connected to the

[GM-C2] circuit board, the output or temperature required by the heat consumer can be communicated to the ETA control system via an analogue signal (0-10

V or 4-20 mA).

1 Operating condition and information.

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

button.

2 Temperature request (by external control) to the

ETA heating system.

3 A switching contact to display the demand for heat from the external heat consumer

4 Heat consumer on/off switch

= switched on

= switched off

Heat demand

This switch symbol indicates whether the heat consumer is currently demanding heat

(

( from the heating system. If the switch is open

), there is currently no demand. If it is closed

), heat is being demanded from the ETA heating system.

External heat demand function

If the heat consumer is turned on ( ), heat is supplied on the basis of the set time windows.

In the settings menu ( button), time windows and temperatures for the heat consumers are shown. See chapter

6.9.1 "Setting the charging times"

.

Within the time slots, the external heat consumer can demand heat from the buffer. If the buffer is colder than the temperature demanded by the heat consumer, the

ETA boiler is activated.

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ETAtouch controller

6.9.1

Setting the charging times

Open the overview screen of the set charging times and temperatures

The standby times for the heat consumers and the set temperatures are adjusted in the settings ( button).

To adjust, open the settings and then open the standby times of any given day with the [Stand-by times

Daily plan] button. An overview screen opens.

[External heat demand] function block

The parameter can be found under:

External demand

Enable temperature

6.9.2.2

Frost protection

Explanation of [Frost protection]

This parameter is used to set the freeze protection limit for the consumer controlled with the external heat demand.

If the outside temperature falls below this value, the external charging pump will be turned on to protect the consumer. It will remain in operation until the outside temperature is at least 2 °C higher than the [Frost protection] temperature setting.

The factory setting for the freeze protection threshold is +5 °C outside temperature to protect consumers at risk from freezing (such as air heaters).

If there is no freezing risk for the connected consumers, the freeze protection limit can be set lower.

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

The parameter can be found under:

External demand

Frost protection

Fig. 6-63: 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 Setting the temperature within the time window

8 Period of the time window

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

6.1.6.6

"Setting a time window" .

6.9.2

6.9.2.1

Text menu - Adjustable parameters

Enable temperature

Explanation of [Enable temperature]

This parameter is used to set the minimum temperature of the heating system for starting the charging pump of the external heat consumer.

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[Heating pipeline] function block

6.10

[Heating pipeline] function block

Overview of heating pipeline

A heating pipeline is defined as a connection between a heat producer and a consumer with an additional pump and optional mixing valve.

Example: Boiler and consumer are in different and widely separated buildings.

The heat is supplied to the connected consumers

(buffer, heating circuits, hot water tank, etc.) via the heating pipeline with the heating pipeline pump.

ETAtouch controller

Transmission line as heat transfer station

With the [Transfer station] option, this function block can be used to control a heat transfer station in a local heating network. This function block is then the heat producer for the connected consumers such as heating circuits, buffers, hot water tanks, etc.

Fig. 6-64: Heating pipeline with mixer

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 pipeline.

Currently the heat producer provides a 77 °C flow temperature in the pipeline.

3 Pipeline mixer

4 Pipeline pump

5 Heating pipeline consumers

Currently, the consumers are charged at a flow temperature of 47 °C.

To protect the consumers, an antifreeze function is available in the pipeline pump control system.

If the outside temperature drops below the set frost protection limit (factory set at -20 °C), the remote pump remains in operation until the outdoor temperature is at least 2 °C higher than the set temperature [Frost protection].

Fig. 6-65: Transmission line as heat transfer station

1 Operating condition and information.

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

button.

2 Heat transfer station heat exchanger

3 Heating pipeline pump

4 Heat transfer station consumers.

Currently, the consumers are charged at a flow temperature of 77 °C.

5 On/Off switch for the heat transfer station

= switched on

= switched off

If the heat transfer station is turned on ( ), then the connected consumers can be supplied with heat.

Once the heat is delivered to the consumer, a yellow line appears beside the flow temperature and the symbol of the consumer in the overview.

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ETAtouch controller [Heating pipeline] function block

73

Function block [special conveyor] and [external conveyor]

6.11

Function block [special conveyor] and [external conveyor]

Special types of conveying systems

This function block is used with wood chip boilers to control special versions of fuel conveyor systems. For example:

• Silo conveyor system

• Double agitator (two agitators supply one boiler)

• Intermediate conveyor screw (several conveyor screws in series)

Conveyors with a drive power up to 1.1 kW are controlled in the [Special conveyor] ([SpConv]) function block. This covers all ETA conveyors.

Conveyors with a higher drive power are controlled in the [Ext. conveyor] ([ExtConv]) function block.

ETAtouch controller barrier is interrupted and displayed in red. If the light barrier is displayed in green, there is no fuel or insufficient fuel in the drop chute.

6.11.1

Intermediate conveyor screw

Intermediate conveyor screw overview

When several conveyor screws in series are used to transport fuel to the boiler, they are referred to as intermediate conveyor screws.

1 Operating condition and information.

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

button.

2 Light barrier (only with [Light barrier in drop chute] option)

3 Consumers of the conveying system (the boiler)

The agitator and the screw are shown in green as soon as they begin to transport fuel. They are displayed in grey when not in operation or when the screw is turning in reverse in order to remove a blockage.

A light barrier for the drop chute is supplied exworks for controlling the fuel conveying system.

For external conveying systems, the light beam is available as an option.

If the drop chute is filled with enough fuel, the light

1 Producer for the intermediate conveyor screw

(conveying system)

2 Consumer of the intermediate conveyor screw

(boiler)

3 Light barrier (only with [Light barrier in drop chute] option)

The intermediate conveyor screw appears green when it is turning in the discharge direction. The intermediate conveyor screw is shown in grey when not in operation or if it is turning against the discharge direction in order to remove a blockage.

A light barrier is also supplied with the intermediate conveyor screw ex-works for controlling the fuel transport. For external conveying systems, the light beam is available as an option.

If the drop chute is filled with enough fuel, the light barrier is interrupted and displayed in red. If the light barrier is displayed in green, there is no fuel or insufficient fuel in the drop chute.

6.11.2

Double agitator

Double agitator overview

When two agitators transport the fuel to a discharge screw and from there to the boiler, the configuration is called a double agitator. Each agitator is shown in its own function block.

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ETAtouch controller Function block [special conveyor] and [external conveyor]

The two agitators take it in turns to supply the boiler with fuel. In order to ensure that the fuel deposit is emptied at a steady rate, the system switches between the two agitators automatically.

You can find this parameter in the boiler function block under:

Intermediate conveyor screw

Double agitator

Switch. time

1 Light barrier (only with [Light barrier in drop chute] option)

2 Consumers of the conveying system (the boiler)

3 Conveying system On/Off switch.

= switched on

= switched off

With the On/Off switch, a single conveying system can be switched off. The second conveying system automatically takes over once the fuel has been conveyed to the boiler.

The agitator and the screw are shown in green as soon as they begin to transport fuel. They are displayed in grey when not in operation or when the screw is turning in reverse in order to remove a blockage.

A light barrier for the drop chute is supplied exworks for controlling the fuel conveying system.

For external conveying systems, the light beam is available as an option.

If the drop chute is filled with enough fuel, the light barrier is interrupted and displayed in red. If the light barrier is displayed in green, there is no fuel or insufficient fuel in the drop chute.

6.11.2.1

Switch. time (for double agitator)

Explanation

This parameter sets the length of time for which an agitator is in operation to supply fuel. After this time, a switch to the second agitator follows automatically.

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[Agitator] function block

6.12

[Agitator] function block

Agitator overview

This function block is used to control an agitator without conveyor screws and with a separate drive. An example is when an agitator supplies fuel to two boilers

(double screw agitator).

The separate driver only drives the agitator with the flat springs. The discharge screws of the two boilers are operated by their controller. When one of the boilers demands fuel, the agitator starts up.

The filling level of the agitator is controlled by the [Light barrier for fill level measure top] and [Light barrier for fill level measure bottom] options when the agitator is filled by a conveyor.

ETAtouch controller

Agitator functionality

With the On/Off switch you can enable or switch off the agitator. If the agitator is enabled, the

ETA boiler can activate it when needed. If the agitator is switched off, the boiler switches to [Locked] mode and cannot start heating.

The agitator is only put into operation by the ETA boiler when the boiler needs fuel.

[Empty] button

Optional: only with [Light barrier for fill level measure top] or [Light barrier for fill level measure bottom] yellow.

Pressing this button blocks the fuel supply to the agitator, causing the agitator to be emptied.

If the button has been pressed, it will light up

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 agitator.

Displayed only when the agitator is filled by the conveying system.

3 Light barrier (only with optional [Light barrier for fill level measure top] or [Light barrier for fill level measure bottom])

4 [Empty] button for emptying the agitator. The button is displayed only when the optional light barrier is installed.

5 Agitator On/Off switch.

= enabled

= switched off

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Filling the storage room

7 Filling the storage room

Before filling the fuel store

Before filling, the conveyor and boiler must be fully assembled and connected.

Also perform a visual inspection of the conveyor to identify any damage or foreign objects.

CAUTION!

Never drive over the floor agitator

After filling, switch the boiler back to normal mode. In doing so, reset the [fill floor agitator] function to [No]. If this is not done, the boiler will automatically switch back to normal mode after some time.

Start filling in the centre

Start filling the fuel store from the centre of the floor agitator outward. If the floor agitator is filled from the side, the rotating spring arm slices through the wood chips and then speeds up in the still empty part of the fuel store.

Floor agitator must be turning while filling

The floor agitator must be turning while the fuel store is being filled. When the fuel store is empty, the floor agitator's spring arms are extended. If the spring arms are covered with fuel in this position, they will be trapped and the floor agitator will no longer be able to turn.

If the fuel store is filled through a hole from above, the fuel must be fed onto the rotating floor agitator slowly.

The floor agitator can be damaged if a dumper load is poured on "in one go" from a height of 3 m or possibly even 6 m.

The maximum fill height of the fuel depends on the fuel, or its weight:

• Pellets up to 2.0 m

• Wood chips up to 5.0 m

The rotation of the floor agitator is initiated from the settings menu (

button, see 6.2 "[Boiler] function block – HACK" ) in the boiler overview window.

From this menu, set the [fill floor agitator] function to

[Yes]. This results in the boiler starting up for

30 minutes and the rotation of the floor agitator.

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Rectifying problems

8 Rectifying problems

Malfunctions in fuel transport

The drives for transport of the fuel are monitored by the control system. If the discharge screw or the stoker screw is blocked, the control system tries to unblock the screw by reversing it.

If the blockage persists after 3 attempts to remove it, an error message is displayed. The boiler starts an ember burnout and then switches to [Malfunction] mode. As long as the blockage persists, the boiler can no longer be switched on.

In the case of an error message with "current draw too high", a single large piece of wood or a foreign body is often blocking the discharge screw.

An error message with "overload" or "motor protection" indicates wood chips that are too fine or too long are interfering with the discharge screw. That overloads the drive, which is switched off by the drive protection.

Before eliminating the blockage, switch off the boiler with the mains switch. The maintenance covers can be opened when eliminating the blockage.

The most common cause of a blockage is a full ash box. So first check to see how full the ash box is and empty it. If the ash box is not full, then it can be assumed that a foreign object is blocking the tilting grate. In either case, perform the following steps.

1. End the boiler's heating mode with the On/Off switch in the boiler overview window. As soon as the [Switched off] operating condition is displayed, switch off the boiler with the mains switch.

2. Detach the ash box from the boiler and check the visible part of the ash screw. The foreign body may already be found at the end of the ash screw, where it can be removed.

Fig. 8-2: Ash screw

3. If no foreign body is visible, it is probably in the combustion chamber under the tilting grate.

Open the combustion chamber door and use the poker to lift the combustion chamber cover and lean it against the combustion chamber wall.

Fig. 8-1: Access for eliminating blockage

1 Drop chute maintenance cover

2 Rotary valve maintenance cover

3 Safety switch for rotary valve maintenance cover

4 Drop chute safety switch

After removing the blockage, replace the covers and switch the boiler back on with the mains switch.

Ash screw jammed

If the ash screw is stuck, a corresponding warning will be displayed on the screen.

4. The grate cannot be tilted by hand. Tipping is done by starting de-ashing with the [De-ash] button.

The grate tilts and remains in this position for approximately 15 seconds.

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Rectifying problems

WARNING!

Danger of crushing due to tilting grate

 When the grate is tilted, switch off the boiler with the mains switch. This causes the grate to remain in this position so injuries are prevented.

Now the ash screw under the tilting grate is accessible and the foreign body can be removed.

3. The ash screw is now loosened from its shaft and can be extracted from the ash duct by turning it anti-clockwise.

5. After removing the foreign object, replace the combustion chamber cover and reattach the ash box to the boiler.

6. Switch on the boiler with the mains switch. To check, start de-ashing by pressing [De-ash] .

If no error message appears, switch the boiler back on with the On/Off switch. If there is still a blockage, the ash screw must be removed.

Removing the ash screw

If the ash screw is jammed or the foreign body cannot be removed, the ash screw must be removed.

1. End the boiler's heating mode with the On/Off switch in the boiler overview window. As soon as the [Switched off] operating condition is displayed, switch off the boiler with the mains switch.

2. Detach the ash box from the boiler and remove the

M8 screw that secures the ash screw.

Fig. 8-4: Unscrewing the ash screw

4. Remove the ash or the foreign body from the ash duct.

5. Then insert the ash screw again and secure it with the M8 screw. Replace the ash box and switch on the boiler with the mains switch. To perfom the check, start de-ashing by pressing the [De-ash] button.

Switch the boiler back on with the On/Off switch.

Fig. 8-3: Removing the screw

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Suitable fuels

9 Information on fuel

9.1

Suitable fuels

The amount of ash depends on the fuel

Ash is the non-flammable residue from the wood. It consists of minerals such as calcium and potassium without which life cannot exist, but also soil, sand and stones, i.e. impurities in the fuel.

Wood chip, with its very low bark content, has an ash content of approximately 0.5 %. The bark itself has an ash content of nearly 4 %. In practice, there is always soil and sand stuck to the bark.

Fuel from crops has a very high potassium content.

The ash content is in the range 3 to 6%.

Wood residues with a high proportion of fine branches and needles is extremely dense in storage, is poorly ventilated and does not dry. Frequently, this material already begins to rot at the timber storage site. With this process of decomposition, the heating value diminishes and the ash content rises.

How often ash waste containers have to be emptied depends on the heat capacity of the boiler and the quality of the fuel (ash content, heating value, etc..).

The preferred fuel is coarse wood chips with a low fine content

The length of the individual wood chips should be between 30 and 50 mm, to ensure that air can circulate well among the stored chips, water can escape from the pile and the tendency to rot and turn mouldy is minimal.

If the fine content (sawdust, bark, needles, soil, sand) is too high, it can obstruct the airways. Water evaporates inside the warm wood chip pile. If the vapour cannot escape, it will condense in the upper part of the heap. Some of the wood chips will then rot and turn to compost with no heating value.

Avoid green, moist wood chips

Only wood chips that are sufficiently dry (water content below 25%) can be stored in a concrete bunker without problems. Moist, coarsely chopped chips stored in an open hall exposed to the wind quickly reach a water content under 35%.

Be especially careful with waste wood

When waste wood is on offer, it may be rotten with no heating value; only buy waste wood by weight and with limited water content (25% maximum). Also ensure

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Information on fuel that the wood contains no contaminants. The applicable laws only allow the use of untreated wood without foreign substances for heating purposes.

Wood-processing facilities may burn chipboard if it contains no halogens or wood preservatives.

Binding agents containing chlorine used to frequently be used in wood products. if these are burned in a boiler without appropriate cleaning of the flue gas, contaminants detrimental to health will be emitted. Apart from this, a very high chlorine content will have a severe negative effect on the life of the boiler.

Only burn wood products or painted, coated or varnished wood if you are sure these contain no wood preservatives, organohalogen compounds or heavy metals.

Nails and stones

Nails and stones will hardly bring the boiler to a halt, but they cause increased wear on the screws and the blades in the rotary valve.

Impurities in the fuel

Impurities in the fuel result in a higher ash content and are frequently responsible for a lower ash melting point. If the ash melting point is exceeded, the ash fuses (slag formation). It is therefore in the plant operator's interests to keep impurities to a minimum.

Types of wood chips

The best quality wood chips are finely chopped hardwood, without bark, with low dust content and a water content below 20%. With the highest heating value and the lowest storage volume requirement, this would be the optimum fuel for any boiler.

Fine wood chips can be made from dry wood, enabling a higher storage density.

Even if wood is stored dry, the energy content wanes, and the heating value of dry wood decreases by 10% over 10 years.

Wood chips from dry branches and shrubbery cuttings have higher bark content and usually also large amounts of dirt and decayed material. Resulting in more ash.

If they were chopped from dry wood, there will be no storage problems and the reduction in boiler output is low.

Forestchopped wood chips from fresh branches are not fit f or storage and reduce the achievable boiler output si gnificantly. www.eta.co.at

Information on fuel

Wood that has been stored in damp conditions for a l ong time (10 years) has lost up to 50% of its heating value.

Chips from such wood significantly reduce the achiev able boiler output.

The final product from wet wood is compost, which ca n be disposed of in a refuse incinerator but can hardly be burned in a normal boiler.

Ensure good ventilation during storage.

The higher the water content of the wood, the more c oarsely it should be chopped.

Never store more than a year's supply of wood chips

(round logs can be stored more easily and densely).

Be very careful where wood chips from waste wood a re on offer at especially low prices; the fraction of dec ayed material and perhaps also the amount of foreign objects (nails, wood preservatives, sand, stones) can be very high.

9.2

Moist fuel

Decay and mould

Up to a water content of approx. 25%, the water is bound up in the wood fibres. Above 25%, water is found between the fibre cells in cavities and capillary vessels. This unbound water is a habitat for, and also a basis for the reproduction of, microbes and fungi, which can penetrate the tree through wounds in the wood structure, particularly cuts or breaks. These microbes convert cellulose and lignin into the basic building blocks carbon dioxide and water. The wood rots, hollows out and becomes brittle, ultimately losing all of its heating value.

When a tree is felled, the race between drying and decay begins. As the water content decreases, the living conditions for microbes worsen until they die off when the water content drops below 25%. The faster the drying process, the more heating value remains in the wood.

For thin branches, the microbes have a very large contact surface in relation to the wood volume. No matter how neatly the branches are stacked, losses in heating value over 25% are the rule (and considerably more in wet weather). This is why forestry businesses don't even take part in this race when branches are smaller than 3 to 5 cm; instead, the material is left behind as nutrient material for the forest.

Easy recognition of moist or dry wood

Even through professionals who work daily with wood chips only trust the oven test for measurements of the exact water content, there is still a very simple way to distinguish moist from dry. Chips that feel dry in the

Moist fuel hand have a water content below 25% and can be stored without problems. If they feel wet, the water content is sure to be above 35%.

If the wood chips are dark brown, light and already crumbly, then you are holding rotten wood in your hands, wood that has already lost the majority of its heating value. From such "compost" you can expect only problems, but not boiler output.

Do not store moist wood chips without ventilation

Wood chips can only be stored without ventilation (for example in a concrete cellar) if their water content is no more than 30%.

If moist wood chips from a sawmill are to be used anyway, then no more than three weeks' supply should ever be kept in an unventilated bunker. An air inlet and an outlet fan can remove water vapour and at least limit mould growth.

Store moist wood chips in an open hall

During the decay process, moist wood chips release heat that drives out water. Wet areas form on the surface, and rising water vapour may also be visible. If the wind is given the chance to transport the water away, coarse wood chips will dry while decay and fungi will stay within acceptable limits.

Best is a flying roof separate from living and working quarters, which keeps rain out but lets the wind work unhindered. At least one side of the storage hall should be completely open. Additional openings in all other walls improve the storage conditions.

9.3

Drying and chopping wood chips

Coarse wood chips with minimal fine content dry fastest

Coarse chips (chopped with sharp blades!!!) dry faster with less loss of material due to the improved air circulation. Fill heights between 4 and 6 m have proven effective. This height is also safe as regards selfignition, which only becomes a danger at heights of 8 m or more.

Even when coarsely chopped, very moist and green material (leaves and needles) and bark have a high fine content (typical and unavoidable features of shrubbery cuttings and delimbing material) and higher biological activity, and allow only minimal air circulation. In spite of higher self-heating, the low air circulation slows the drying process and material loss is considerably higher.

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Water content

Dry like hay on a hard surface

For your own use, spread out moist wood chips in a layer 10 cm thick on an asphalt or concrete surface on hot summer days. Good results can also be had on sunny autumn days if you turn the chips over several times. Two days are usually enough to attain a water content below 30%, making the chips fit for storage even under poor conditions.

Drying in a covered mesh enclosure

When building a new wood chip storage facility, roofed storage containers with mesh walls should be considered for air-drying of moist chips. A windy location is important. Southward orientation can help with drying even in winter. The height of the container depends on the height of the front end loader needed for filling. The lowest wall element must be removable to allow removal of the wood chips. The depth can be up to 2 m. Drying time is 4 to 8 months and a water content below 20% is attainable.

Artificial ventilation

In spite of a few elaborate pilot projects with solar energy, drying with heated air blown into the store via channels in its floor has not proven itself very economical thus far. The energy costs for drying often exceed the achievable increase in heating value.

Dry wood before chopping, fell in winter and chop in summer

It is much easier to dry the wood before chopping it.

With interim storage before chopping in summer, a water content below 30% can be reached, ensuring problem-free storage for the wood chips.

The decision whether to dry entire trees, or trunks and branches separately depends largely on the accessibility of the forest and the harvesting methods. Here are a few tips for orientation:

• Well-ventilated piles, trunks with bark removed, or entire trees dry faster and better. Sun helps, and wind is indispensable for drying.

• Softwood should be felled no later than December and stored at least 50 m from the forest due to the risk of beetles.

• If the first regeneration felling is done for softwood in September, the wood will no longer be infested by beetles in the spring. It can be left in the forest without delimbing and chopped as entire trees in summer.

Leave green branches in the forest as nutrients

Leave green branches and treetops in the forest; as fuel they are only "air and water". As valuable nutrients, they should remain in the forest.

Information on fuel

9.4

Water content

Using an oven to determine water content

A kilogram of wood chips is spread out on a baking sheet and dried in an oven for 6 to 12 hours at 101 to

104°C. To be certain of a temperature over 100°C in a typical electric oven in spite of the inexact thermostat, you can set it to 110°C, but no higher as the wood will begin outgassing even at slightly higher temperatures.

Fine and very moist pieces will need to be turned a few times. The difference in weight between the moist test material and the dry material corresponds to the water content.

Longer interim storage of samples can falsify their water content.

Take samples after transport

A pile of wood chips has 10 to 30% more water content in the upper layers than in the middle. The material is mixed by the loading and unloading process during transport. By taking about a litre from 5 different places at a depth of at least 20 cm (never from the surface) in each load, you can get a good average with low error.

Taking the test quantity from the total sample

From several transport loads, you will get more than 1 kg of test material. To obtain a smaller quantity, mix the material by rebuilding the pile, always emptying the shovel over the top of the pile so that the material is distributed over its entire surface. Then flatten the pile and remove the two opposing quarters from it. Repeat the mixing and removal process until you have two batches of test material of 1 kg each, 1 kg for the buyer, who usually determines the water content in the oven, and 1 kg for the seller as a control sample. The volume for one kilogram is around 3 litres for wet, heavy wood chips and as much as 5 litres for very dry and light material.

Water content and moisture

Water content has become the established measurement for wood used for generating energy; in the lumber business, the wood's moisture is usually stated.

Water content (%) = water in the wood (kg) x 100 total weight of wood (kg)

Moisture content (%)

= water in the wood (kg) x 100 dry weight of the wood (kg)

Water content (%) = moisture (%) x 100

100% + moisture (%)

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Information on fuel Judging the quality

9.5

Judging the quality

Criterion

Ash content

Large pieces

Dirt

Green leaves and needles

Metal, stones

Judging the quality

Comments

Contaminated material burns poorly and is often a sign of decayed or dirty wood chips.

Fuel may contain individual, large pieces up to 20 cm long.

They are cut by the blade in the rotary valve. The majority of wood chip pieces should not be longer than 5 cm to reliably prevent blockages in the fuel conveying system.

Soil and sand cause slag formation on the grate and result in more effort spent on cleaning d ue to a lower ash melting point.

A layer of chips from green branches with leaves or needles can cause a blockage in a pile of chips on which rising moisture condenses, resulting in decay and mould.

Even though the boiler cannot be brought to a halt by nails and small stones, such foreign ma terials should be avoided in wood chips because they cause increased wear in the fuel conve ying system.

The base for the following tables are wood chips from spruce or alder, with a water content of 30% and size P16S.

Criterion

Water content

Chip size

Kind of wood

Judging quality when buying in loose cubic metres

Comments

The lower the water content, the higher the heating value. In addition, under a water content of 25% the wood shrinks.

So a cubic metre with 20% water content, contains approx. 3% more wood than a cubic metre wi th 30% water content. The water content is given as a percentage of the total weight.

The more finely the material is chopped, the more material fits in a cubic metre.

20%

30%

35%

40%

P16S

P31S

Effect on energy content per loose cubic metre

+6%

0%

-2,5%

-4%

+0%

-16%

+53% Hardwood is denser and heavier and thus has a higher heat co ntent per cubic metre.

Hornbeam, black locu st

Beech +44%

Oak, ash

Birch, maple

Pine, larch

Spruce, alder

+40%

+25%

+19%

0%

Fir, willow

Poplar

Bark content The lighter in colour the wood chips are, the lower their bark co ntent.

Wood chips from small branches or wood chips with bark from sawmills have a high bark content with high ash content and u sually also higher dirt content.

This results in more effort spent on cleaning.

without bark

10% bark

30% bark

Small branches Wood chips from small branches usually have a high degree of decay.

Small branches

-6%

-19%

+5%

0%

-10%

-25%

83

Judging the quality Information on fuel

Criterion

Water content

Chip size

Kind of wood

Judging quality when buying by the kilogram

Comments

The lower the water content, the higher the heating value. The water content is given as a percentage of the total weight.

20%

30%

35%

40%

The chip size has no effect on the heating value per kilogram

Effect on energy content per kilogram

+12%

0%

-12%

-20%

Heavy hardwood, when dried, has about 5% less heating value than softwood, and about 6% less when moist.

Softwood

Hardwood

0%

-5% to

-7%

Bark content

Light hardwood, when dried, has 6% less heating value than softwood and 7% less when moist.

The bark content has little influence on the heating value per ki logram, but a high bark content means a higher ash content an d more time spent on cleaning.

Small branches Wood chips from small branches usually have a high degree of decay.

Small branches -25%

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Information on fuel Other fuels

9.6

Other fuels

Pellets

Miscanthus

Other fuels

Pellets have a higher fuel density and can only be burned with flue gas recirculation. Pellets are always sold by weight. The heating value of hardwood pellets (4.60 kWh/kg) is about 6% less than that of softwood pellets (4.9 kWh/kg).

The heating value is the same as for air-dried softwood; best bought by weight. Since its ash has a very low sintering point, flue gas recirculation is required to prevent slag formation. To reduce boiler corrosion, ensure that chlorine-free fertiliser (potassium sulphate instead of potassium chloride) is used. Regardless of whether it is chopped or made into pellets, miscanthus needs a very large combustion chamber, so for size 35/50 a maximum heating output of 35 kW can be reached, for size 70/90 a maximum of 63 kW, for size 130 a maximum of 95 kW and for size 200 a maximum of 140 kW.

Old wood Wood kept in dry storage loses only the volatile components (about 10% of the heating value).

Wood stored in moist storage decays (cold oxidation process) to the point of total loss of heating value.

Wood shavings The heating value per cubic metre varies widely and is around 30 to 60% less than that of wood chips (with 30% water content) from the same wood. Since wood shavings are usually air-dried

(15% to 20% water content), they are best bought by weight. Wood chips from some types of hardwood cause rapid wear on the combustion chamber's fire clay. With wood shavings, the full rated output of the boiler cannot be reached.

Sawdust

Chipboard

The heating value per loose cubic metre is between 25 and 50% less than that of wood chips (with 30% water content) from the same wood. Sawdust is best bought by weight, after determination of its water content. Dry sawdust from joineries can be burned, but not fresh

(moist) sawdust from sawmills.

Chipboard waste can be used if it is free from formaldehyde and wood preservatives, and is not coated with PVC. However, this is only allowed with an official permit, which is usually only granted on a case-by-case basis to wood-processing facilities.

Demolition wood Only wood that is free of halogens and wood preservatives may be burned. The fraction of rotten wood is often high, and the heating value low, and it is often contaminated with dust, metal and stones.

85

Heating value Information on fuel

9.7

Heating value

Heating values of fuels

Heating value based on weight

Cubic metre (rm) a

Round logs Logs

Weight

Heating value

Water content

15% 30% 15% 30% 15% 30%

Weight

15% 30%

Loose cubic metre (srm) b

Wood chips P16S

Heating value

15% 30%

Wood chips P31S

Weight

15% 30%

Heating value

15% 30%

Unit

Softwood

Fir

Spruce

Douglas fir

Pine

Larch

kWh/ kg kWh/ kg kg/ rm kg/ rm

1 rm =

0.65 fm c

kWh/ rm kWh/ rm

1 rm =

0.56 fm c

kg/ srm kg/ srm kWh/ srm

1 srm = 0.40 fm

kWh/

c

srm kg/ srm kg/ srm kWh/ srm

1 rm = 0.33 fm c

kWh/ srm

4.40

3.51

1270 1170 1100 1010 178 208 780 720 148 171 650 600

4.49

3.58

1380 1260 1190 1090 189 218 850 780 157 181 710 650

4.43

3.53

1480 1360 1280 1170 206 237 910 840 172 198 760 700

4.32

3.44

1630 1490 1400 1290 232 267 1000 920 193 223 830 770

4.27

3.39

1660 1520 1430 1310 239 275 1020 930 199 229 850 780

Hardwood

Poplar

Willow

Alder

Maple

Birch

Ash

Beech

Hornbeam

Black locust

1 rm =

0.59 fm c

1 rm =

0.50 fm c

1 srm = 0.40 fm c

1 rm = 0.33 fm c

3.99

3.16

1020 930 870 790 174 200 690 630 145 167 580 530

3.76

4.06

4.04

4.01

4.10

4.13

4.06

4.11

2.97

3.23

3.21

3.18

3.25

3.28

3.23

3.27

1200

1270

1100

1160

1020

1080

930

990

1550 1420 1310 1200

1570 1430 1330 1210

1760 1610 1490 1390

1800 1640 1520 1390

1920 1760 1630 1490

1920 1760 1630 1490

217

212

260

265

291

295

321

317

250

245

300

305

335

340

369

365

810

860

1050

1060

1190

1220

1300

1300

a. A cubic metre (rm) corresponds to 1 m³ layered round logs/logs (1 m length) with air gaps.

740

790

960

970

1090

1110

1190

1190

181

177

217

221

242

246

267

264

208

204

250

254

279

283

308

304

680

720

880

890

990

1020

1090

1090

620

660

800

810

910

930

990

990

b. A loose cubic metre (srm) corresponds to 1 m³ of loosely dumped wood chips.

c. A solid cubic metre (fm) corresponds to 1 m³ wood without air gaps.

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Emission measurement

10 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 11 "Low-emission operation"

.

Clean the boiler 3 - 5 days before the emission measurement

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

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

CAUTION!

 Under no circumstances clean the boiler and flue pipe on the day of the measurement!

Ensure sufficient heat consumption

Open all radiator valves and turn radiator thermostats to maximum.

Setting the duration of the emission measurement

The duration of the emission measurement is factory-set to 45 minutes. If necessary, this can be increased with the [Service] access level. To do so, switch to the text menu of the boiler. You can adjust the duration as follows:

Boiler

Flue gas

Emission measure

MeasDuration

Prepare and perform emissions measurement

1. The boiler 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. 10-1: Settings window for emission measurement

2. Use the [Begin measurement] button to enter the date agreed for chimney sweeping. The boiler 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. 10-2: 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

87

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

Fig. 10-3: Countdown

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.

Emission measurement

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Low-emission operation

11 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 problems in practice.

It was determined under laboratory conditions in testing centres that the ETA boiler complies with the new limit values. To be fair, however, it should be noted that high-quality fuels were used and the heating system operated under optimal conditions. Things look different in practice. Low-quality fuels are often used, which represents a problem for the dust limit value.

Fuels used for testing

The following fuels were used as test fuel for emission measurements and approval of the boiler:

• Conifer wood chips without bark according to EN

ISO 17225-4 with the designation "P31S M25 F05

A0.5"

• 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 aerosol formers present in the fuel (e.g., potassium, calcium, sulphur, chlorine, sodium, zinc, silicon, phosphorous...) are released in relatively fixed proportions. Accordingly, the level of dust emissions is determined by the proportions of these aerosol formers in the fuel.

The situation is made difficult by the fact that the percentage of aerosol formers in the wood 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 aerosol formers.

In order to operate the system with the lowest possible dust emissions, a properly maintained condition as well as high-quality fuels with the lowest possible ash content (barks, impurities, leaves, needles...) are indispensable.

The Clean Air Act 1993 and Smoke Control Areas

Under the Clean Air Act local authorities may declare the whole or part of the district of the authority to be a smoke control area. It is an offence to emit smoke from a chimney of a building, from a furnace or from any fixed boiler if located in a designated smoke control area. It is also an offence to acquire an "unauthorised fuel" for use within a smoke control area unless it is used in an "exempt" appliance ("exempted" from the controls which generally apply in the smoke control area).

In England appliances are exempted by publication on a list by the Secretary of State in accordance with changes made to sections 20 and 21 of the Clean Air

Act 1993 by section 15 of the Deregulation Act 2015.

Similarly in Scotland appliances are exempted by publication on a list by Scottish Ministers under section

50 of the Regulatory Reform (Scotland) Act 2014.

In Wales and Northern Ireland these are authorised by regulations made by Welsh Ministers and by the

Department of the Environment respectively.

The ETA HACK 20, 25, 35, 45, 50, 70, 90, 130 and

200 kW boiler has been recommended as suitable for use in smoke control areas when burning wood chips according to EN ISO 17225-4, P16S-P31S (G30-G50) with a maximum water content of 35% and with an optionally available flue gas recirculation, wood pellets according to EN ISO 17225-2-A1 or EN plus class A1.

Further information on the requirements of the Clean

Air Act can be found here: https://www.gov.uk/smoke-control-area-rules

Your local authority is responsible for implementing the

Clean Air Act 1993 including designation and supervision of smoke control areas and you can contact them for details of Clean Air Act requirements.

89

Water hardness Heating water

12 Heating water

12.1

Water hardness

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

Table 1 Table 2

Specific water content in litre/kW

Heat producer with large (> 0.3 l/ kW) water content

< 20 l/kW

≥ 20 /kW

< 50 l/kW

≤ 50 kW

16.8 °dH 11.2 °dH

≥ 50 l/kW

5.6 °dH

Heat producer with small (> 0.3 l/ kW) water content

< 20 l/kW

11.2 °dH

≥ 20 l/kW

< 50 l/kW

5.6 °dH

≥ 50 l/kW

0.6 °dH

Total output of the heat producer

> 50 kW

≤ 200 kW

> 200 kW

≤ 600 kW

11.2 °dH

5.6 °dH

> 600 kW 2.8 °dH

5.6 °dH

2.8 °dH

0.6 °dH

2.8 °dH

0.6 °dH

0.6 °dH

5.6 °dH

2.8 °dH

0.6 °dH

2.8 °dH

0.6 °dH

0.6 °dH

0.6 °dH

0.6 °dH

0.6 °dH

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 litres) 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 11.2

°dH.

Softening with a salt-regeneration ion exchanger

We recommend softening water with salt-regeneration ion exchangers, just as drinking water is softened. This method does not remove salt from the water. It replaces the calcium in the lime with 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

3

PO

4

) or

25 g/m³ of trisodium phosphate dodecahydrate (Na

3

-

PO

4

.12H

2

O). 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, the uniform zinc layer dissolves uniformly and is dispersed evenly throughout the system without localised corrosion.

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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.

12.2

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 contaminated and the pH value is too low.

Refilling

91

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