2017-01-30
EN
0000000294
V.003
2.38.0
3005, 3106
93526-001
Wood chip boiler
20 - 90 kW
Operation
ETA Heiztechnik
Gewerbepark 1
A-4716 Hofkirchen an der Trattnach
Tel: +43 (0) 7734 / 22 88 -0
Fax: +43 (0) 7734 / 22 88 -22
info@eta.co.at
www.eta.co.at
3
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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
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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
General Preface
5
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 , gua rantee 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 compa ny 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
ETA boiler. A LAN ca ble i s req uired for the co nnectio n
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 cu rrent
price list applies.
Software Description
The software version described in this documentation
corresponds to the version valid at the time of publication. The software version installed on your product
may differ from that described in this documentation.
A software update to a more recent version can
always be performed. With the appropriate authorisation, the required files can be found at
"www.eta.co.at".
Explanation of symbols
Instructions and information
Layout of safety instructions
SIGNAL WORD!
Type and source of danger
Possible effects
• Measures for avoiding the danger
Types of safety instruction
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Warranty, guarantee and liability General
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.
Operation with unsuitable fuels, in particular high-
slag 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 ag ainst
excess pressure and a thermal relief valve (triggered
at 97 °C) to protect against overheating must be
installed by the contractor.
Provide a sufficiently large expansion tank or a
pressure maintaining device
To prevent air from being drawn in while the system is
cooling, the heating system professional must provide
a sufficiently large expansion tank or a pressure
maintaining device.
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.
General Warranty, guarantee and liability
7
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: Temp erature monitoring
and control devices, safety temperature limiters, safety
valves and thermal discharge valves.
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Boiler functionality
2 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
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
Boiler functionality
9
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 bl ade on the edg e
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 ou tput is re gu lated by pau ses 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 ke pt 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.
10 www.eta.co.at
General information Safety
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 ge t 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 extingu isher sho uld
be kept outside the boiler room, visible and easily
accessible.
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.
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
Safety Safety devices
11
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.
Fig. 3-2: Thermal emergency cooling valve
1 Cold water connection
2 Isolating valve; remove hand wheel
3Strainer
4 Thermal emergency cooling valve
5 Visible outlet to sewer
The cold water supply must be connected to the up per
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.
Install safety valve against overpressure
A safety valve with 3 bar opening pressure must be
installed on the boiler . Every heat producer in a h eating
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. 3-3: 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 de termined
on the basis of the heating system's maximum heating
capacity, as shown in the table.
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.
Valve size
a
Nominal diameter (DN)
a. The valve size is determined by the size of the inlet
connection.
Maximum heating
capacity (kW)
15 (G ½) 50
20 (G ¾) 100
25 (G 1) 200
32 (G 1 ¼) 300
40 (G 1 ½) 600
50 (G 2) 900
12 www.eta.co.at
Safety devices Safety
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 pip e 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 pe rmitted. 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.
Changing the fuel
13
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".
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.
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. 4-3: 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.
14 www.eta.co.at
Slag Changing the fuel
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:
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.
Generally speaking, the darker th e wood chips,
the higher the proportion of dirt that will cause
slag.
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.
Changing the fuel Settings
15
4.2 Settings
Changing the fuel
16
Adaptations for
HACK 20-50 kW
Fuel Pellets Wood chips Carpentry material Miscanthus
a
a. Reduced max. output: 35 kW
Water content < 15% < 15% 15 - 25% 25 - 35% < 15% < 20%
Ash/dust content low high low high low high low high low high low high
Software parameters [Fuel] [Pellets] [Woodchips] [Woodchips] [Miscanthus]
Firebed level sensor
Position 1 3 4 3 5
De-ashing interval (boiler with buffer storage tank)
Software parameters
[De-ash after min.] 35 kg 12 kg 25 kg 6 kg 25 kg 6 kg 25 kg 6 kg 12 kg 6 kg 1 kg 1 kg
[De-ash after max.] 60 kg 45 kg 50 kg 25 kg 50 kg 25 kg 50 kg 25 kg 50 kg 25 kg 10 kg 8 kg
De-ashing interval (boiler without buffer storage tank)
Software parameters
[De-ash after min.] 35 kg 25 kg 25 kg 12 kg 25 kg 12 kg 25 kg 20 kg 25 kg 12 kg 3 kg 3 kg
[De-ash after max.] 60 kg 45 kg 50 kg 25 kg 50 kg 25 kg 50 kg 25 kg 50 kg 25 kg 10 kg 8 kg
Boiler with flue gas recirculation installed
Software parameters [Flue gas recirculation] [Yes] [Yes]
[Yes]
(recom-
mended)
[Yes] [No] [Yes] [Yes]
Flue gas recirculation status Open Open
Open
(recom-
mended)
Open Closed Open Open
Boiler without flue gas recirculation
Software parameters [Flue gas recirculation] [No]
Changing the fuel
17
Adaptations for
HACK 63-90 kW
Fuel Pellets Wood chips Carpentry material Miscanthus
a
a. Reduced max. output: 65 kW
Water content < 15% < 15% 15 - 25% 25 - 35% < 15% < 20%
Ash/dust content low high low high low high low high low high low high
Software parameters [Fuel] [Pellets] [Woodchips] [Woodchips] [Miscanthus]
Firebed level sensor
Position 2 3 5 3 5
De-ashing interval (boiler with buffer storage tank)
Software parameters
[De-ash after min.] 80 kg 28 kg 35 kg 9 kg 35 kg 9 kg 35 kg 9 kg 17 kg 9 kg 2 kg 2 kg
[De-ash after max.] 120 kg 90 kg 65 kg 33 kg 65 kg 33 kg 65 kg 33 kg 65 kg 33 kg 15 kg 12 kg
De-ashing interval (boiler without buffer storage tank)
Software parameters
[De-ash after min.] 80 kg 57 kg 35 kg 18 kg 35 kg 18 kg 35 kg 28 kg 35 kg 18 kg 5 kg 5 kg
[De-ash after max.] 120 kg 90 kg 65 kg 33 kg 65 kg 33 kg 65 kg 33 kg 65 kg 33 kg 15 kg 12 kg
Boiler with flue gas recirculation installed
Software parameters [Flue gas recirculation] [Yes] [Yes]
[Yes]
(recom-
mended)
[Yes] [No] [Yes] [Yes]
Flue gas recirculation status Open Open
Open
(recom-
mended)
Open Closed Open Open
Boiler without flue gas recirculation
Software parameters [Flue gas recirculation] [No]
18 www.eta.co.at
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.
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
By knocking on the vertical wall of the ash box,
you can also check the ash level without opening
the box. A full ash box makes a short, dull thump.
When empty it makes a hollower sound like a drum.
Open both lateral fasteners by pressing their safety
catches in the direction of the arrow. Remove the ash
box from the boiler.
Fig. 5-1: Fastener
Remove the lid by opening the fastener s and empty
the ash box.
Fig. 5-2: 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.
Empty the ash box
19
Inspect the seal on the ash box lid to ensure it is in
good order, and replace it if necessary.
Fig. 5-3: Seal
Inspect the integrity of the ash box seals on the boiler,
replace them if necessary.
Fig. 5-4: Seal
Attaching the ash box to the boiler
Reattach the cover of the ash box and secure with the
fasteners. Push the ash box over the connection on
the boiler and attach it to the boiler with the fasteners.
Switching on the boiler
Switch the boiler back on with the On/Off
switch.
20 www.eta.co.at
Getting to know the control system ETAtouch controller
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
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
ETAtouch controller Getting to know the control system
21
Several views are available for each function block. To
switch between these, tap on the symbol at
the top left. The selection of views appears.
Fig. 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
adjusted,if necessary, see chapter 6.1.2 "
Text
menu".
The terminal assignment of individual
components, such as temperature sensors,
pumps and mixers, are visible within the input
and output menu, where they can be changed if
required. Also, for example, 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".
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 symbol (upper left) and then
selecting .
In the user interface, you can set the most important
and common settings. The display is dependent on the
selected function block. The illustrated example shows
the user interface of a heating circuit with a room
sensor.
Fig. 6-3: Heating circuit user interface
1 Operating condition and information
2 Producer for the heating circuit.
Currently , the buffe r provides a flow temperature of
65 °C to the heating circuit.
3 On/Off switch for the heating circuit
= switched on
= switched off
4 Increase or decrease the room temperature
5 Function block settings.
In this menu, the settings and functions most
commonly used can be stored. For the heating
circuit, for example, the heating times and the
heating curve are adjusted here.
6 Graphic display of the heating times and room tem-
peratures settings
7 Different operating modes of the heating circuit
22 www.eta.co.at
Getting to know the control system ETAtouch controller
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.
Fig. 6-5: Settings window
1 Factory setting and adjustment range
2 Reset to factory setting
3 Save and close
4 Cancel and close
The default setting and the setting range are displayed
on the right side. The new value is entered with the
keypad, and stored by pressing the [Save] button.
Resetting to factory settings is done by pressing the
[Factory settings] button. To cancel and close the
window, tap the arrow on the left side of the screen.
Only modify parameters whose function you're
familiar with. Before making any changes, read
the relevant section of the user manual or configuration manual, or open the integrated help feature. If yo u
cannot find sufficient information about a parameter,
please consult a specialist.
Commonly used parameters can be found in the
settings
Commonly used parameters can be found in the
function block settings ( button). There, the
parameters are identified by the symbol and can be
adjusted by tapping. This saves you having to search
through the text menu for these parameters.
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
ETAtouch controller Getting to know the control system
23
Fields with additional line symbols on the right
side (example: ) indicate that further
information is available. Tap on the appropriate field
and a window with the description will open. Close the
window using the arrow on the left side.
Fig. 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.
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. 6-9: Symbols when an error occurs
Types of errors and their meaning
• Notification
A notification does not interrupt operation, and
therefore no acknowledgement is requir ed. Notifications inform the user, for example, that pump
anti-blocking protection has been activated.
• Warning
A warning is displayed on failure of a function
which is not absolutely essential for continued
operation. It can be acknowledged before the
cause of failure is remedied. However, it will
continue to be displayed until the cause has
actually been dealt with.
• Malfunction or alarm
An error or alarm stops operation. Some of these
can be acknowledged before the cause of the
problem is remedied. However, they will continue
to be displayed until the cause has actually been
dealt with. Other errors and alarms can only be acknowledged after the cause has successfully been
remedied. Once an error or alarm has been
resolved and acknowledged, you must restart the
boiler or the affected function block.
24 www.eta.co.at
Getting to know the control system ETAtouch controller
If the error symbol at the bottom of the screen is
tapped, a window appears. In this, the function block in
which the error occurred will be displayed.
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. 6-11: 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.
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. 6-12: Overview
Details of a component, such a s 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. 6-13: Settings window
With the appropriate authorization, the heating
circuit mixing valve can be manually put into
operation in the settings window using the [Forward],
[Back] and [Stop] buttons. However, this is primarily
intended for specialists.
Close the settings window using the arrow on the left
side.
ETAtouch controller Getting to know the control system
25
6.1.6 Getting started
6.1.6.1 System settings
Open the system configuration
By tapping the symbol (in the lower left of the
screen), the system settings menu opens.
Fig. 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. 6-15: System configuration menu
To close the system settings, simply tap the
symbol again.
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. 6-16: 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. 6-17: Date and time
26 www.eta.co.at
Getting to know the control system ETAtouch controller
Using the arrow keys, set the time. Tap on the date
field to open the calendar. Press the [Save] button to
save. Subsequently , the system settings ar e closed by
tapping the symbol.
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.
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. 6-19: Overview of the settings menu
To change the name, tap on the [Change name]
symbol. An on-screen keyboard appears in order to
enter the new name.
Fig. 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.
ETAtouch controller Getting to know the control system
27
In the user interface, producers f or the function
block are always displayed on the left side and
consumers on the right side.
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. 6-22: 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.
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. 6-23: 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
28 www.eta.co.at
Getting to know the control system ETAtouch controller
3. An overview screen opens.
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.
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. 6-26: 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.
ETAtouch controller Getting to know the control system
29
Time windows from Wednesday copied to
Saturday and Sunday.
1. In the overview , press the [Weekly plan] button
to switch to view all days of the week.
Fig. 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.
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.
30 www.eta.co.at
Getting to know the control system ETAtouch controller
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.
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. 6-31: dLAN network
Worldwide access via www.meinETA.at
Remote control via the free internet platform
www.meinETA.at.
After registering on this platform, the boiler can be
controlled remotely. It can be accessed by
smartphone, tablet or PC and is, of course, protected
by username and password. You can also access the
boiler's control system via your home network with a
free VNC Viewer . To see how remote operation of your
boiler works, please visit www.meinETA.at.
Enter access data for the boiler remote control
After receiving your login information (after registering
on "www.meinETA.at"), enter it on the control panel in
the [meinETA Access] menu. This enables access to
remote control of the boiler.
To enter the login information, open the control panel
( symbol, bottom left). By tapping the
[meinETA Access] symbol, a settings window appears.
Fig. 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. 6-33: On-screen keyboard
To finish, press the [Register now] button. Activation is
performed (if an internet connection is available). If this
is successful, the symbol for the remote control
ETAtouch controller Getting to know the control system
31
appears at the bottom of the screen. If an error is
displayed, check the access data and the internet
connection.
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 p latfo rm
"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.
32 www.eta.co.at
[Boiler] function block – HACK ETAtouch controller
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.
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 o n 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
ETAtouch controller [Boiler] function block – HACK
33
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 meas urement. During this period no heating operation will be
started, so that the heati ng 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 ha ving to search
through the text menu for these parameters.
Adjustable parameters
Detailed descriptions of the paramet ers 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:
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 auto matically.
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].
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
Boiler
Settings
Fuel
34 www.eta.co.at
[Boiler] function block – HACK ETAtouch controller
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:
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 und er:
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] para meter 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:
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.
If the value is set to 0 kg, this reminder will not
appear.
The parameter can be found under:
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:
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
Settings
Flue gas recirculation
Boiler
Ash removal
De-ash after min.
De-ash after max.
Boiler
Ash removal
Begin idle time WT cleaning
Idle time during WT cleaning
Boiler
Ash removal
Empty ash box after
Water content of wood chips Increase by
< 15% 1.5 - 2.0%
15 - 25% 0.5 - 1.0%
> 25% no increase
Boiler
Residual O2
Increase O2 target value
ETAtouch controller [Boiler] function block – HACK
35
36 www.eta.co.at
[Buffer] function block ETAtouch controller
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.
Mode of operation
In the settings menu ( button), the time window for
buffer charging can be set, and therefore the char ge
times (see chapter 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 m in.]. 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.
ETAtouch controller [Buffer] function block
37
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.
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".
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. 6-37: Solar heating system on buffer
1 Currently , the buffer is char ged by the solar heating
system at a flow temperature of 69 °C
2 Additional temperature sensor [Buffer bottom
Solar] for control of the solar heating system
The [Solar priority] function enables the solar
heating system to charge the buffer without the
boiler being started within 2 configurable time slots
(see 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
38 www.eta.co.at
[Buffer] function block ETAtouch controller
displayed twice, and the additional buffer temperatures
for solar stratified charging are displayed next to the
buffer.
Fig. 6-38: Stratified charging of the buffer
6.3.3 Buffer as a combination tank
Buffer with integrated hot water tank or coils
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 (s ee 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 t he hot water t ank ag ain
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 th e set temperatures can be adjusted in the settings ( button).
To adjust, open the settings and then open the
ETAtouch controller [Buffer] function block
39
charging times of any given day with the [Hot water
Charging times Daily plan] button. An overview screen
opens.
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 w ater out side 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".
40 www.eta.co.at
[Buffer] function block ETAtouch controller
6.3.4 Text menu - Adjustable parameters
Adjustable parameters
The following parameters can be configured for the
basic function in the buffer text menu.
If a solar heating system is additionally connected to
the buffer, further parameters can be set.
If the buffer is implemented as a combination tank,
further parameters can be set.
Detailed descriptions of the parameters are provided
below.
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:
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.
Buffer
Buffer top
Buffer top min.
Buffer bottom
Buffer bottom off
Extra charge
Buffer top min.
Buffer bottom off
Extra charging from
Chrg. button
Buffer
Solar heat diss.
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
a. Only visible with several buffer storage tanks and solar
heating system
b. Only visible with solar heating system and buffer with 2
internal coils
c. Only for solar heating systems with switchover between
several tanks
Hot water tank
Switch-on diff.
Circulation
Circulation runtime
Circulation pause
Enable circulation
Buffer
Buffer top
Buffer top min.
ETAtouch controller [Buffer] function block
41
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:
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 [Buf fer top min.] and
shutdown temperature [Buffer bottom off] can be set
for this charge. Charging ends as soon as the buffer
reaches these temperatures.
The function is deactivated if one of the two tem-
peratures is set to "0".
The parameters can be found und er:
At first, set the parameter [Extra storage
activated?] to [Yes], and then the other
parameters will be displayed.
To immediately start this additional buf fer 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 th e selected buffer may
take up excess solar heat from a buffer charged by the
solar heating system.
If you set the function with the [Activate?] parameter
set to [Yes], this buffer takes up the solar excess. This
buffer is then charged up to the configured maximum
temperature [...until buffer max].
The parameter can be found under:
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 pr iority
means that this section will be charged by the solar
heating system first. A low priority means that it will be
charged last.
The priority for the top and bottom section of the buf fer
can be found under:
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 p lace in
the top section once the solar panel is at least 7 °C
warmer than [Buffer top min. solar].
However, this minimum temperatur e only ap plies
if the conditions for stratified charging are
satisfied. If they are not, solar charging is switched to
the bottom section of the buffer, to make use of the
solar energy.
The parameter can be found under:
Buffer
Buffer bottom
Buffer bottom off
Buffer
Extra charge
Extra storage activated?
Buffer top min.
Buffer bottom off
Extra charging from
Chrg. button
Buffer
Solar heat diss.
Activate?
...until buffer max
Buffer
Buffer top Solar
Priority
Buffer bottom Solar
Priority
Buffer
Buffer top Solar
Buffer top min. solar
42 www.eta.co.at
[Buffer] function block ETAtouch controller
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:
or also in:
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] temperat ure, th e solar
pump of the solar heating system is switched off.
The parameter can be found under:
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.
Set the start of solar priority before the first time
window of the heating circuit and hot water tank.
Otherwise, the boiler may start beforehand, in order to
charge the heating circuit or hot water tank.
During the configured times for solar priority, it
may happen that the heating circuits or the hot
water are not supplied with sufficient heat.
The parameters for setting the 2 time windows are in:
Set the start of solar priority before the first time
window of the heating circuit and hot water tank.
Otherwise, the boiler may start beforehand, in order to
charge the heating circuit or hot water tank.
During the configured priority times, it may be th e
case that the heating circuits or the hot water are
not supplied with sufficient heat.
Switch function on or off
The parameter can be found under:
6.3.4.10 Extra solar heat
Explanation of [Extra solar heat]
Optional: only with solar heating systems
This function defines whethe r the buffer storage tank
may convey this excess heat from th e solar heating
system to other consumers, even if they do not
currently require any heat.
The following conditions must be met in order for
the excess solar heat to be passed on in this way:
• The outside temperature must have exceeded the
configurable value [from outside temp.].
• The [Buffer top] temperature in the buffer must
have exceeded the configurable value of [at buffer
top].
• The [Buffer bottom Solar] temperature in the buffer
must have exceeded the configurable value of [at
buffer bottom sol.].
Buffer
Buffer top Solar
Min. out. temp. Solar prio.
Buffer
Buffer bottom Solar
Solar priority
Min. out. temp. Solar prio.
Buffer
Buffer bottom Solar
Buffer bottom max
Buffer
Buffer bottom Solar
Solar priority
Begin solar prio.
Change priority at
End solar prio.
Buffer
Buffer bottom Solar
Solar priority
Solar priority
ETAtouch controller [Buffer] function block
43
• 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 und er:
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:
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:
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:
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:
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.
Buffer
Buffer bottom Solar
Extra solar heat
from outside temp.
at buffer top
at buffer bottom sol.
Buffer
Priority
Hot water tank
Switch-on diff.
Hot water tank
Circulation
Circulation runtime
Hot water tank
Circulation
Circulation pause
44 www.eta.co.at
[Buffer] function block ETAtouch controller
The parameter can be found under:
Hot water tank
Circulation
Enable circulation
ETAtouch controller [Buffer] function block
45
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[Hot water tank] function block ETAtouch controller
6.4 [Hot water tank] function block
Hot water tank overview screen
1 Operating condition and information.
A description of the operating conditions can be
found in the integrated Help menu by pressing the
button.
2 Producer for the hot water tank.
Currently , the ho t water storage tank is charge d 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".
Within the charging times, the hot water is charged to
the set hot water temperature (for example: 60 °C).
The charge starts as soon as the current hot water
temperature is lower than the set hot water
temperature by the adjustable difference [Switch-on
diff.].
Example:
In the time window, the hot water temperature is set to
60 °C. The difference [Switch-on diff.] is 15 °C.
=> Charging starts as soon as the hot water
temperature drops to 45 °C, and it ends as soon as the
hot water has reached 60 °C.
If an additional temperature sensor [] is installed
for the lower part of the hot water tank, charging
ends as soon as this sensor has reached the configurable temperature [HW bottom off].
ETAtouch controller [Hot water tank] function block
47
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 w ater out side 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".
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
Detailed descriptions of the paramet ers 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:
6.4.2.2 HW bottom off
Explanation of [HW bottom off]
Optional: only with additional [Hot water tank bottom]
temperature sensor
Hot water tank
Switch-on diff.
HW bottom off
a
a. Only visible with additional temperature sensor
Solar heat diss.
b
b. Only visible for buffers with solar heating system
Priority
c
c. Only visible for solar heating systems with switchover
between several tanks
Circulation
d
d. Only visible with additional circulation pump
Circulation runtime
Circulation pause
Hot water tank
Switch-on diff.
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[Hot water tank] function block ETAtouch controller
This parameter defines when charging of the hot water
tank will end. As soon as the additional [Hot water tank
bottom] temperature sensor in the hot water tank
reaches the adjustable [HW bottom off] temperature,
charging of the hot water tank ends.
The parameter can be found under:
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:
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:
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.
The parameter can be found under:
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:
Hot water tank
HW bottom off
Hot water tank
Solar heat diss.
Hot water tank
Priority
Circulation
Circulation runtime
Circulation
Circulation pause
ETAtouch controller [Hot water tank] function block
49
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[Fresh water module] function block ETAtouch controller
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.
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 buf fer
is maintained at no lower than the configured hot water
temperature. Outside the set time windows, the hot
water is maintained at the lowest set temperat ure of
the time windows, provided that the accumulator tank
is sufficiently hot.
If a circulation pump is installed for the hot water,
it will be put into operation as "self-learning" by
default. This means that the hot water taps of the last
2 weeks are stored. The operating times of the current
day will be calculated from this and the circulation
pump is started accordingly.
When this function is switched off, the operating times
for the circulation pump can be set manually. This is
achieved by opening the settings ( button) and
pressing the [Circulation times Daily plan] button.
After commissioning, no more data is available
for the "self-learning" circulation. That is why an
operating period of about 4 weeks is required in the
beginning, so that the control system can save
sufficient data.
ETAtouch controller [Fresh water module] function block
51
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 w ater out side 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 accesse d via th e setting s
with the [Circulation times Daily plan] button.
6.5.2 Text menu - Adjustable parameters
Adjustable parameters
Detailed descriptions of the paramet ers 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 ai r
intake, both pumps are operated at full speed for a
short period of time to remove the air from the fresh
water module. This can also take place multiple times
sequentially.
This function is activated by default. During
venting, the hot water can briefly be hotter than
the target temperature set.
The parameter can be found under:
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
Automatic venting
Emergency operation only with buffer pump
Circulation
Self-learning
Circulation runtime
Circulation pause
Hot water
Automatic venting
Hot water
Emergency operation only with buffer pump
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[Fresh water module] function block ETAtouch controller
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:
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:
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
Self-learning
Circulation
Circulation runtime
Circulation
Circulation pause
ETAtouch controller [Fresh water module] function block
53
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[Heating circuit] function block ETAtouch controller
6.6 [Heating circuit] function block
Overview of the heating circuit when a room
sensor is installed
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 tem-
peratures settings
7 Operating mode [Timer]
8 Operating mode [Set-back]
9 Operating mode [Heating]
Overview of the heating circuit without a room
sensor
In the overview, a temperature slider appears, rather
than the measured room temper ature.
Fig. 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".
ETAtouch controller [Heating circuit] function block
55
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 an d
then turned back on.
[Heating] button
Thus, the heating circuit is manu ally switched
to heating mode. With the additional switch
(above the symbol), the heating
circuit can be set to remain permanently in heating
mode, thus ignoring any time window, or set
temporarily until the next time window.
[Set-back] button
Thus, the heating circuit is manu ally switched
to reduced operation mode. With the additional
switch (above the symbol), the
heating circuit can be set to remain permanently in
reduced operation mode, or set temporarily until the
next time window.
Temperature slider
This slider is only displayed if a room sensor is
installed for the heating circuit. The temperature
slider is used to adjust the desired room
temperature in a range of +/- 5 °C. By sliding the
switch into the blue area of the scale, the flow
temperature is lowered, and thus the room
temperature also. In the red area, the flow temperature
is raised.
Adjusting the required room temperature
This field is only displayed if a room sensor
is installed for the heating circuit. The arrows
are used to set the required room temperature. In heating mode, an in crease o f 1 °C caus es the
room temperatures of all time slots for all days of the
week to increase by this value.
In reduced operation mode, a reduction by 1 °C
causes the reduced temperature for all days of the
week to decrease correspondingly.
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.
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[Heating circuit] function block ETAtouch controller
To set the holiday function, open the heating circuit
settings ( button), and press the [Vacation]
button. A settings window appears.
Fig. 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 che ck t he set h e at i ng lim it
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 valu e outside the
time window."). If the room temperature is set too low,
there is a danger of freezing.
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. 6-47: 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.
ETAtouch controller [Heating circuit] function block
57
Based on the current outside temperature, the control
system uses the heating curve to calculate the
required feed temperature for the heating mode. For
example, an outside temperature of -10 °C would
result in a feed temperature of 33 °C (see diagram).
Fig. 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 of f. The
same applies to reduced-temperature mo de as soon
as the outdoor temperature exceeds the set heating
limit.
The [Flow max] parameter determines the
maximum flow temperature for the heating circuit,
to protect it from overheating. The factory setting is 45
°C for underfloor heating, and 65 °C for radiators.
When should the heating curve be adjusted?
If the rooms are not warming up, you should check the
following points first before changing the 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. 6-49: 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.
58 www.eta.co.at
[Heating circuit] function block ETAtouch controller
Check operating mode and target room
temperature on the ETA room sensor
• If a room is too cold, check the room sensor, or in
the control system set the operating mode and the
desired room temperature. It is possible that the
heating circuit has been switched off or the room
temperature is set too low.
Fig. 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] an d [F low at - 10 ° C])
for the heating curve and long continuous heating
times (10-14 hour s). Thus, the heat is transfe rred
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".
If no buffer storage tank is available,
several short heating times must be set with
pauses in between. This increases the heat
absorbed by the heating circuit from the boiler in
the short heating times. Through this heating time
interruption, the screed becomes a "buffer" in case
of underfloor heating. Between the heating times,
the screed cools and then absorbs heat again. In a
well-insulated building, observe the following
guidelines:
–Radiator heating: several intervals with
3 hours of heating and 2 hours break
–Underfloor heating: several intervals with
4 hours of heating and 3 hours break
The optimum settings depend on the heat deman d
of the building and each room. Explore this in consultation with your heating contractor or ETA
customer service.
ETAtouch controller [Heating circuit] function block
59
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.
Fig. 6-51: Adjust heating curve (at outdoor temperatures
above freezing)
At outdoor temperatures below freezing, the
rooms are always too hot or too cold:
1. Only parameter [Flow at -10 °C] is adjusted.
2. Change the selector switch to the heating mode
position ( ). Use the arrow keys to
reduce parameter [Flow at -10 °C] if it is too warm,
or increase if it is too cold.
Fig. 6-52: Adjust heating curve (at outdoor temperatures
below freezing)
Outside the heating times, t he rooms are always
too hot or too cold:
1. Then only the reduction is adjusted with parameter
[Set-back difference].
2. Change the selector switch to the reduced
operation mode position ( ). Use the
arrow keys to reduce parameter [Set-back
difference] if it is too cold, or increase if it is too
warm.
Fig. 6-53: Adjust reduced operation mode
With underfloor heating, reduced operation mode is
only partially noticeable because t his heating system
reacts very slowly due to the high thermal mass of the
screed. Changes in parameters [Set-back difference]
are therefore often not noticeable.
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[Heating circuit] function block ETAtouch controller
6.6.3.2 Setting the heating limits
Specifying the heating limits for the heatin g circuit
For each heating circuit, separate heating limits are
adjustable for heating mode (within the set heating
times) and reduced operation mode (outside the set
heating times).
If the current outside temperature exceeds the
configured heating temp erature (for example 18 °C),
the heating circuit is switched off. The same applies to
reduced-temperature mode as soon as the outdoor
temperature exceeds the set heating limit.
If the outside temperature falls below the set
heating limit (for example: 18 °C), a hysteresis of
2 °C will be observed in order to avoid cycling the
heating circuit. Accordingly, the heating circuit will
switch on only once the outside temperature falls
below 16 °C (=18 °C - 2 °C).
The heating limits are adjusted through the settings of
the heating circuit ( button) in the heating curve
menu ( button).
Setting heating limits for heating mode
1. Change the selector switch to the heating mode
position ( ).
Use the arrow keys to reduce parameter [Heating
threshold], so that the heating circuit in heating
mode switches off at a lower outside temperature,
or increase the value.
Fig. 6-54: Heating threshold for heating mode
Setting heating limits for the reduced operation
mode
1. Change the selector switch to the reduced
operation mode position ( ).
Use the arrow keys to reduce parameter [Heating
threshold], so that the heating circuit in reduced
operation mode switches off at a lower outside
temperature, or increase the value.
At settings below 0 °C, there is a risk of
freezing.
Fig. 6-55: Heating limit for reduced-temperature mode
ETAtouch controller [Heating circuit] function block
61
6.6.4 Text menu - Adjustable parameters
6.6.4.1 Room effect
Explanation of [Room effect]
Optional: only for room sensor
The flow temperature is calculate d on the basis of t he
heating curve and the outside 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:
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
Room effect
Heating circuit
Room
Switch-on diff. room
Switch-off diff. room
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[Solar] function block ETAtouch controller
6.7 [Solar] function block
Overview of the solar heating system
1 Operating condition and information.
A description of the operating conditions can be
found in the integrated Help menu by pressing the
button.
2 Collector temperature
3 Solar heating system consumer.
Currently , the hot water storage tank is loaded from
the solar heating system with a flow temperature of
74 °C. The second buffer consumer is not currently
charged.
The solar heating system control principle
The ETA control principle for solar heating systems is
defined so that an adjustable temperature difference
between the panel and the tank (or the upper and
lower buffer area in a buffer with 2 internal coils) is
complied with. This is done by adjusting the speed of
the solar pump.
Manual switching between "High Flow" (high spee d at
a lower collector temperature) and "Low Flow" (low
speed at a higher collector temperature) is not
necessary, because this is automatically controlled.
The ETAtouch control system is compatible with a
great many versions, for enabling the integration of a
solar heating system. The various versions are
described below.
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.
Fig. 6-56: Solar heating system connected to buffer
The speed of the collector pump is controlled in
such a way that the collector supplies a
temperature that is higher than the current tank
temperature by the configurable offset [Target
collector diff.].
When the tank has reached its maximum temperature
(the factory setting of the buffer is 90 °C, and the hot
water tank 60 °C), or if the collector is only warmer by
the offset [Switch-off diff.] (factory setting 5 °C) than
the tank, the collector pump is switched off.
Example:
Buffer temperature [Buffer bottom Solar]: 45 °C
[Target collector diff.]: 10 °C
[Switch-off diff.]: 5 °C
=> The speed of the solar pump is adjusted , so that the
temperature on the collector reaches 55 °C. With the
increase in buffer temperature, the collector
temperature also increases, because the 10°
difference is adhered to.
If the collector temperature cannot be increased
(because the sun provides too little heat), the collector
pump switches off when there is only a 5 °C difference
between the collector and the buffer. Otherwise, the
buffer is charged to the maximum temperature of 90
°C.
ETAtouch controller [Solar] function block
63
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.
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 th e
difference [Switch-off diff.] than the tank that currently
requires charging), the tank with the next highest
priority is charged after the minimum time has 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.
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 te mperature in
the top part of the buffer, so that the boiler does not
have to start for hot water charging.
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 cu rrent requirements or
minimum temperatures and can be viewed in the
buffer's text menu under:
The conditions for solar char ging into the up per buffer
coil are:
• The buffer is not currently charged from the boiler.
• The outside temperature is above the set minimum
temperature of 10 °C ([Min. out. temp. Solar prio.],
see chapter 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.
Buffer
Buffer top Solar
Buffer target solar
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[Solar] function block ETAtouch controller
If one of the described conditions is not met (for
example, if the buffer is currently being charged
by the boiler), there is no reason to feed the solar
charge to the upper buffer coil. Therefore, the solar
charge is directed into the lower coil in order to charge
this area. If all conditions are once again met, charging
is switched to the upper coil.
The only exception to this is when solar power
increases while charging the lower buffer coil.
Then, once the minimum time (factory setting 20 min.)
passes, charging will switch to the upper coil, although
the conditions are not met.
6.7.4 Solar heating system with external
heat exchanger
Solar heating system with external heat exchange r
The control principle is the same as in a solar heating
system with just one tank, see chapter 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 exchange r. Through speed
adjustment, it attempts to adapt the temperature
difference between collector and secon dary flow (see
chart 78 °C - 74°C = 4 °C) to the temperature
difference between the return of the solar heating
system and the tank (49 °C - 45 °C = 4 °C).
Fig. 6-60: Regulation principle
ETAtouch controller [Solar] function block
65
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.
6.7.5 Solar heating system with external
heat exchanger and stratified
charging valve
Solar heating system with external heat exchange r
and stratified charging valve
This variation of solar heating system also aims to
produce a sufficiently high temperature in the upper
area of the buffer, so the boiler does not have to start
for hot water charging.
Fig. 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 upp er buff er
area [Buffer target solar].
The control principle is identical to that of a buffer with
two internal coils. The conditions for solar charging into
the upper buffer coil are also the same. They are
described in chapter 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 u pper. If
the conditions for solar charging into the upper co il are
not met, the lower coil will be charged first. If the
secondary feed temperature rises enough that the
temperature in the upper buffer area [Buffer top Solar]
is exceeded, solar charging is immediately switched to
the upper coil. There is no minimum time for solar
charging. Once the secondary feed temperature 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 ETAtouch controller
6.7.6 Text menu - Adjustable parameters
6.7.6.1 Collector min
Explanation of [Collector min]
This parameter sets the minimum temperature for
starting the solar pump. The solar pump can only be
started once the solar panel has exceeded this temperature.
Do not set this temperature too high, to ensure
that it is possible for heat to supplied to pre-hea t
the tank even when there is little su nlig ht . T he o pt ima l
range is between 30 °C and 50 °C.
The parameter can be found under:
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 sola r hea ting
system, the temperature of the solar panel
[Collector] is compared with the buffer temperature
[Buffer bottom Solar]. If the hot water tank is being
charged, the [Hot water tank bottom] temperature is
compared.
A high temperature difference results in a low
speed of the solar pump. This way, a smaller
quantity of water is conveyed through the solar panel.
The water remains in the solar panel for a longer time,
and therefore produces a higher working temperature
in the panel. Consequently, a higher hot water
temperature is achieved, but there are also more
losses from the solar panel.
A low temperature difference results in a high
speed of the solar pump. A larger quantity of
water is therefore conveyed through the solar panel.
The water remains in the solar panel for a short time,
and so also becomes less hot. The working
temperature of the solar panel is therefore lower, but
there are fewer losses via the solar panel.
The parameter can be found under:
State
Collector
Collector min
State
Collector pump
Target collector diff.
ETAtouch controller [Solar] function block
67
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[Aux.boiler] function block ETAtouch controller
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 th e
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).
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 reques ts 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.
ETAtouch controller [Aux.boiler] function block
69
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.
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.
The parameter can be found under:
Aux.boiler
Settings
Start lag
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[External heat demand] function block ETAtouch controller
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.
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.
The pump for charging the external heat
consumer only starts when the temperature
available from the heating system is higher than the
adjustable enable tempera ture [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).
ETAtouch controller [External heat demand] function block
71
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.
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 Text menu - Adjustable parameters
6.9.2.1 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.
The parameter can be found under:
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
Enable temperature
External demand
Frost protection
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[Heating pipeline] function block ETAtouch controller
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.
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].
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. 6-65: 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.
ETAtouch controller [Heating pipeline] function block
73
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Function block [special conveyor] and [external conveyor] ETAtouch controller
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.
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 turnin g
in reverse in order to remove a blockage.
A light barrier for the drop chute is supplied ex-
works 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.
6.11.1 Intermediate conveyor screw
Intermediate conveyor screw overview
When several conveyor screws in series are used to
transport fuel to the boiler , they a re referred to as i ntermediate conveyor screws.
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 intermedi-
ate 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.
ETAtouch controller Function block [special conveyor] and [external conveyor]
75
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.
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 turnin g
in reverse in order to remove a blockage.
A light barrier for the drop chute is supplied ex-
works 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.
You can find this parameter in the boiler funct ion
block under:
Intermediate conveyor screw
Double agitator
Switch. time
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[Agitator] function block ETAtouch controller
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.
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 [Lig ht barrie r 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
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]
Pressing this button blocks the fuel supply to
the agitator, causing the agitator to b e emptied.
If the button has been pressed, it will light up
yellow.
Filling the storage room
77
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
Floor agitator must be turning while filling
The floor agitator must be turn ing 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.
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 .
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.
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
78 www.eta.co.at
Rectifying problems
8 Rectifying problems
Malfunctions in fuel transport
The drives for transport of the fuel are monitored
by the control system. If the d ischarge 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 fin e 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.
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.
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.
Rectifying problems
79
4. Remove the cover on the front. Press the button on
the tilting grate's actuator and tilt the grate with the
supplied tool.
5. Now the ash screw under the tilting grate is
accessible and the foreign body can be removed.
6. After removing the foreign body, replace the
combustion chamber cover and reattach the cover
on the front.
7. Replace the ash box and 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. 8-3: Removing the screw
3. The ash screw is now loosened from its shaft and
can be extracted from the ash duct by turning it
anti-clockwise.
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.
80 www.eta.co.at
Suitable fuels Information on fuel
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 bra nches
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 empt ied
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 cir culate
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
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 conta i n no woo d
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.
Information on fuel Moist fuel
81
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 consider ably
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
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 witho ut ventilation
Wood chips can only be stored without ventilation (for
example in a concrete cellar) if their water co ntent 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 m aterial loss
is considerably higher.
82 www.eta.co.at
Water content Information on fuel
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.
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 co ntent
in the upper layers than in the middle. The mate rial is
mixed by the loading and unloading process during
transport. By taking about a litre from 5 d ifferent 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 th e
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 (%)
Information on fuel Judging the quality
83
9.5 Judging the quality
The base for the following tables are wood chips
from spruce or alder , with a water content of 30%
and size P16S.
Judging the quality
Criterion Comments
Ash content Contaminated material burns poorly and is often a sign of decayed or dirty wood chips.
Large pieces 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.
Dirt 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.
Green leaves and
needles
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.
Metal, stones 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.
Judging quality when buying in loose cubic metres
Criterion Comments
Effect on energy content
per loose cubic metre
Water content 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.
20%
30%
35%
40%
+6%
0%
-2,5%
-4%
Chip size The more finely the material is chopped, the more material fits
in a cubic metre.
P16S
P31S
+0%
-16%
Kind of wood Hardwood is denser and heavier and thus has a higher heat co
ntent per cubic metre.
Hornbeam, black locust+53%
Beech +44%
Oak, ash +40%
Birch, maple +25%
Pine, larch +19%
Spruce, alder 0%
Fir, willow -6%
Poplar -19%
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 +5%
10% bark 0%
30% bark -10%
Small branches Wood chips from small branches usually have a high degree of
decay.
Small branches -25%
84 www.eta.co.at
Judging the quality Information on fuel
Judging quality when buying by the kilogram
Criterion Comments
Effect on energy content
per kilogram
Water content 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%
+12%
0%
-12%
-20%
Chip size The chip size has no effect on the heating value per kilogram
Kind of wood Heavy hardwood, when dried, has about 5%
less heating value than softwood, and about 6%
less when moist.
Light hardwood, when dried, has 6%
less heating value than softwood and 7% less when moist.
Softwood
Hardwood
0%
-5%
to
-7%
Bark content 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%
Information on fuel Other fuels
85
9.6 Other fuels
Other fuels
Pellets 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).
Miscanthus 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 ch amber, 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 cha mber's fire clay . With wood shavings, the full
rated output of the boiler cannot be reached.
Sawdust 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 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.
86 www.eta.co.at
Heating value Information on fuel
9.7 Heating value
Heating values of fuels
Heating
value based
on weight
Cubic metre (rm)
a
Loose cubic metre (srm)
b
Round logs Logs Wood chips P16S Wood chips P31S
Weight
Heating
value
Weight
Heating
value
Weight
Heating
value
Water
content
15% 30% 15% 30% 15% 30% 15% 30% 15% 30% 15% 30% 15% 30%
Unit
kWh/kgkWh/kgkg/rmkg/rmkWh/rmkWh/rmkg/
srm
kg/
srm
kWh/
srm
kWh/
srm
kg/
srm
kg/
srm
kWh/
srm
kWh/
srm
Softwood
1 rm =
0.65 fm
c
1rm =
0.56 fm
c
1 srm = 0.40 fm
c
1 rm = 0.33 fm
c
Fir 4.40 3.51 1270 1170 1100 1010 178 208 780 720 148 171 650 600
Spruce 4.49 3.58 1380 1260 1190 1090 189 218 850 780 157 181 710 650
Douglas fir 4.43 3.53 1480 1360 1280 1170 206 237 910 840 172 198 760 700
Pine 4.32 3.44 1630 1490 1400 1290 232 267 1000 920 193 223 830 770
Larch 4.27 3.39 1660 1520 1430 1310 239 275 1020 930 199 229 850 780
Hardwood
1 rm =
0.59 fm
c
1rm =
0.50 fm
c
1 srm = 0.40 fm
c
1 rm = 0.33 fm
c
Poplar 3.99 3.16 1020 930 870 790 174 200 690 630 145 167 580 530
Willow 3.76 2.97 1200 1100 1020 930 217 250 810 740 181 208 680 620
Alder 4.06 3.23 1270 1160 1080 990 212 245 860 790 177 204 720 660
Maple 4.04 3.21 1550 1420 1310 1200 260 300 1050 960 217 250 880 800
Birch 4.01 3.18 1570 1430 1330 1210 265 305 1060 970 221 254 890 810
Ash 4.10 3.25 1760 1610 1490 1390 291 335 1190 1090 242 279 990 910
Beech 4.13 3.28 1800 1640 1520 1390 295 340 1220 1110 246 283 1020 930
Hornbeam 4.06 3.23 1920 1760 1630 1490 321 369 1300 1190 267 308 1090 990
Black locust 4.11 3.27 1920 1760 1630 1490 317 365 1300 1190 264 304 1090 990
a. A cubic metre (rm) corresponds to 1 m³ layered round logs/logs (1 m length) with air gaps.
b. A loose cubic metre (srm) corresponds to 1 m³ of loosely dumpe d wood chips.
c. A solid cubic metre (fm) corresponds to 1 m³ wood witho ut air gaps.
Emission measurement
87
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 th at co uld go wr on g,
resulting in incorrect measurements even though the
boiler fully and consistently complies with these limits
when operating in accordance with the relevant
standards.
Notes on emission measurement in Germany
In accordance with the provisions of "BImSchV,"
lower limit values for the emission measurement
in Germany apply to all new heating system installations starting 1 January 2015. Notes on compliance
are found under 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 thermost ats
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 th e
duration as follows:
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
Boiler
Flue gas
Emission measure
MeasDuration
88 www.eta.co.at
Emission measurement
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.
Low-emission operation
89
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 proble ms 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 aeroso l formers present in t he
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 author ised 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.
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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
Instructions for determination:
1. Divide water content (litres) of the heat producer by
its output in kW. If the result is larger than 0.3l/kW ,
Table 1 applies. If the value is smaller or equal to
0.3l/kW, Table2 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 da ta for the permissible w ater 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) => Table1.
2. The specific water content is 33,3 l/kW (1500÷45 =
33.3) => middle column in Table 1.
3. The total output of the boiler is 45 kW; therefore,
only the data from the first line (≤ 50 kW) are
relevant.
The permissible water hardness in this example is 1 1.2
°dH.
Softening with a salt-regeneration ion exchanger
We recommend softening 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 wi th sodium from the
salt, and has considerable advantages. It is cheap and
chemically stable against contamination. In addition, it
produces a natural alkalinity that generally results in a
sufficiently non-corroding pH value of around 8.
pH value between 8 and 9 may require dosing with
trisodium phosphate
If the heating water's pH value has not itself changed
to more than 8 after a week of operation, increase it by
adding 10 g/m³ of trisodium phosphate (Na
3PO4
) or
25 g/m³ of trisodium phosphate dodecahydrate (Na
3
-
PO
4
.12H2O). Wait another 2-4 weeks before making
further corrections. The pH value must not exceed 9.
No hybrid installations
A disadvantage of salt-regeneration ion exchange is
the salt content with its high electrical conductivity,
which can lead to electrolytic corrosion, especially of
aluminium or galvanized steel. If only steel, brass,
gunmetal and copper are used in the heating system
and the use of stainless steel is limited to small areas,
then no corrosion problems should be expected, even
with salty water.
Galvanized and aluminium parts in a heating system
are always in danger of corrosion, especially in
combination with copper tubing. In practice, this
means no hot-galvanized fittings and no mixing of
galvanized tubing with copper tubing. There is an
illogical exception: galvanized steel tubing combined
with boilers or buffer storage tanks made of steel.
Presumably , th e uniform zinc layer di ssolves unifo rmly
and is dispersed evenly throughout the system without
localised corrosion.
Table 1
Heat producer with large (> 0.3 l/
kW) water content
Table 2
Heat producer with small (> 0.3 l/
kW) water content
Specific water content in litre/kW < 20 l/kW
≥ 20 /kW
< 50 l/kW
≥ 50 l/kW < 20 l/kW
≥ 20 l/kW
< 50 l/kW
≥ 50 l/kW
Total output of the heat
producer
≤ 50 kW 16.8 °dH 11.2 °dH 5.6 °dH 11.2 °dH 5.6 °dH 0.6 °dH
> 50 kW
≤ 200 kW
11.2 °dH 5.6 °dH 2.8 °dH 5.6 °dH 2.8 °dH 0.6 °dH
> 200 kW
≤ 600 kW
5.6 °dH 2.8 °dH 0.6 °dH 2.8 °dH 0.6 °dH 0.6 °dH
> 600 kW 2.8 °dH 0.6 °dH 0.6 °dH 0.6 °dH 0.6 °dH 0.6 °dH
Heating water Refilling
91
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.
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