Wood chip boiler HACK 110-130 kW Operation

Wood chip boiler HACK 110-130 kW Operation
2015-10-13
EN
0000000080
V.007
X.33.0
3203
93605
Wood chip boiler HACK
110-130 kW
Operation
ETA Heiztechnik
Gewerbepark 1
A-4716 Hofkirchen an der Trattnach
Tel: +43 (0) 7734 / 22 88 -0
Fax: +43 (0) 7734 / 22 88 -22
[email protected]
www.eta.co.at
Contents
1
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Boiler functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Emission measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1
6.2
7
Changing the fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.1
7.2
8
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Slag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.1
8.2
8.3
8.4
8.5
8.6
User interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.2 Setting the date and time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.3 Changing the names of function blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.4 Text menu navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.5 Setting a time window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.6 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Function block [Boiler] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2.3 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Buffer] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Hot water tank] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Fresh water module] 2 pumps function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Heating circuit] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6.3 The heating curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6.4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
21
22
23
24
25
28
28
28
29
32
32
35
36
37
44
44
45
46
47
50
50
51
51
52
54
54
56
57
59
3
8.7
8.8
8.9
8.10
8.11
8.12
8.13
8.6.5 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Solar] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.7.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.7.3 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Aux.boiler] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.8.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.8.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.8.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[External heat demand] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.9.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.9.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.9.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.9.4 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Heating pipeline] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.10.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.10.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Special conveyor] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.11.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.11.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.11.3 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[External conveyor] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.12.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.12.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.12.3 Text menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
[Agitator] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.13.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.13.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60
62
62
67
67
70
70
71
72
72
74
74
74
75
76
78
78
79
80
80
81
82
84
84
85
86
88
88
88
9
Filling the storage room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
10
Rectifying problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
11
Information on fuel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
11.1
11.2
11.3
11.4
11.5
11.6
11.7
12
4
Suitable fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Moist fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Drying and chopping wood chips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Water content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Judging the quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Other fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Heating value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Low-emission operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
www.eta.co.at
General information
1
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 alterations
We reserve the right to make technical modifications
without notice. Printing and typesetting errors or
changes of any kind made in the interim are not cause
for claims. Individual configurations depicted or
described here are only optionally available. In the
event of contradictions between individual documents
regarding delivery scope, the information in our current
price list applies.
Explanation of symbols
Instructions and information
Layout of safety instructions
SIGNAL WORD!
Type and source of danger
Possible effects
•
Measures for avoiding the danger
Types of safety instruction
CAUTION!
On non-compliance with this safety instruction, there is
a risk of material damage.
WARNING!
On non-compliance with this safety instruction, there is
a risk of physical injury.
DANGER!
On non-compliance with this safety instruction, there is
a risk of major physical injury.
5
Preface
2
Preface
Dear Customer,
This user manual provides important information and
instructions, to ensure safe and satisfactory operation
of your product.
A LAN cable is required for the connection from the
ETAtouch control system to the internet modem.
For details see the boiler installation instructions.
Please take the time to look through it.
Warranty and guarantee
You should also read the "Conditions for warranty,
guarantee, liability" (see page 8) carefully. As a rule,
these conditions will be satisfied by a professional
heating technician. Nevertheless, inform the
technician of our warranty conditions. All of the requirements we impose are intended to prevent
damage that neither you nor we wish to occur.
Read the user manual
Please read the user manual carefully before starting
up the system. This is the only way to ensure that you
can operate your new boiler efficiently and with
minimum environmental impact.
Take advantage of the knowledge and skills of an
expert
Only allow an expert to assemble, install and
commission the equipment and carry out the basic
boiler settings. Insist on receiving an explanation and
training on how your new boiler functions and how to
operate and maintain it.
Extended warranty
We grant an extended warranty if the product is commissioned by an authorised partner company or by our
own customer service.
In this connection, please note the warranty conditions
applicable at the time of purchase.
Service agreement
You can ensure the best care for your heating system
by taking out a service agreement with one of our
certified contractors or our own customer service.
Remote control of the boiler via the internet
The remote control enables you to operate your ETA
boiler remotely via your own network (VNC Viewer) or
the internet <www.meinETA.at> using a PC,
smartphone or tablet, as though you were standing
right in front of the ETAtouch control system of your
ETA boiler.
For details, see operating manual "meinETA
communication platform".
6
www.eta.co.at
Preface
7
Warranty, guarantee and liability
3
Warranty, guarantee and liability
Requirements
We can only accept liability for the function of our
products if they are correctly installed and operated.
This is only possible if the conditions below are
complied with.
Maximum of 2,000 hours at full load per year
The boiler described in this user manual may only be
used for heating and producing hot water, with no more
than 2,000 full-load hours annually.
up of the heating system and for refilling after repairs.
Addition of hard water should be minimised to limit
limescale build-up in the boiler.
For the initial fill-up, the lime content of all water in the
heating system may not exceed the value of 30,000
lt°dH (system volume in litres multiplied by the
hardness in degrees of German hardness).
pH value between 8 and 9
The pH value of water used to fill the heating system
must be between 8 and 9.
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.
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.
Observe local building and fire safety regulations
Local building and fire safety regulations must be
observed.
Suitable fuels
•
•
•
•
•
Wood chips according ISO 17225-4:2014, quality
classes A1/A2/B1/B2, size P16S-P31S, maximum
water content 35% (M35)
Wood pellets according ISO 17225-2:2014, quality
class A1, ENplus-A1
Shavings
and
swarf
briquets
according
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 highslag pellets from grain waste, for example, or
corrosive fuels such as miscanthus fertilised with
potassium chloride, is prohibited.
Ensure supply air is free from aggressive
substances
The air supplied to the boiler must be free from
aggressive substances such as chlorine and fluorine
from solvents, cleaning agents, adhesives and propellants, or ammonia from cleaning agents, to prevent
corrosion of the boiler and chimney.
Install safety valve and thermal relief valve
A safety valve (triggered at 3 bar) as protection against
excess pressure and a thermal relief valve (triggered
at 97 °C) to protect against overheating must be
installed by the contractor.
Provide a sufficiently large expansion tank or a
pressure maintaining device
To prevent air from being drawn in while the system is
cooling, the heating system professional must provide
a sufficiently large expansion tank or a pressure
maintaining device.
Open expansion tanks must not be used.
Sufficient power
Operation at lower power than the lowest power
specified on the type plate is not permitted.
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.
Only fill with softened water
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 fill-
8
www.eta.co.at
Warranty, guarantee and liability
Repairs
Repairs are only permitted using spare parts provided
by us. The only exceptions are commonly available
standard parts such as electrical fuses or fastening
materials, provided such parts have the necessary
features and do not compromise the safety of the
system.
Proper installation
The installing contractor is liable for proper installation
according to the corresponding installation instructions
and the relevant rules and safety regulations. If you as
customer have installed the heating system partly or
entirely without relevant training and in particular
without up-to-date practical experience, without having
the installation checked by a trained and responsible
expert, we exclude defects in our delivery and consequential damages resulting from this cause from our
warranty, guarantee and liability.
Repair of defects
For repairs of defects carried out by the customer or by
a third party, ETA shall only bear the costs or remain
obligated by warranty if this work was approved in
writing in advance by the customer service of ETA
Heiztechnik GmbH.
No tampering with boiler safety devices
Boiler safety devices such as those mentioned below
must not be tampered with: Temperature monitoring
and control devices, safety temperature limiters, safety
valves and thermal discharge valves.
9
Boiler functionality
4
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
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 bunker 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 bunker empties, the
spring arms extend toward the wall and clear out the
bunker.
10 Downdraught channel
Floor agitator must turn during filling
11 Heat exchanger with turbulators
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. To this end,
press [MEAS.]
to force the boiler into operation.
12 Draught fan
13 Ash screw under tilting grate
14 Heat exchanger ash screw
15 Ash box
10
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
www.eta.co.at
Boiler functionality
floor agitator is simultaneously decoupled via the
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.
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.
Maximum protection against burn-back
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
downdraught 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.
The airtight one-chamber rotary valve keeps the
combustion chamber safely separated from the fuel
deposit in all operating modes. No hot gas can enter
the fuel conveying system and ignition of the wood
chips is impossible. This is the most reliable burn-back
protection possible. Individual pieces of wood that are
too long cannot bring the fuel conveying system to a
halt. They are cut off by a hardened blade on the edge
of the rotary valve chamber.
Optimised ignition
After short breaks in combustion, the refractory-lined
combustion chamber remains hot enough that any
new fuel which is fed in can be ignited by the remaining
embers. The ignition fan only needs to be activated
after long periods without combustion. To save electricity, the ignition fan is deactivated immediately after
successful ignition, which is recognised by the lambda
probe and exhaust temperature.
Hot combustion chamber with tilting grate
The wood chips are pushed onto the side of the grate
by the stoker screw. A refractory-lined combustion
chamber ensures a clean fire with high burnout temperature. At intervals that depend on the output level,
the grate is tilted by 90° after a controlled ember
burnout in order to automatically remove ash and
foreign bodies from the combustion chamber. Until the
next time the grate is tipped, the ash remains under the
grate and can burn out before it is transported by the
ash screw to the detachable ash box.
Turbulent heat exchanger with cleaning
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.
Combustion breaks with minimal heat loss
The fire can be regulated between minimum and
maximum output. In autumn and spring, when heating
loads are smaller, the output is regulated by pauses in
combustion. To avoid a build-up of smouldering tar in
the boiler and chimney during these pauses, the fire
undergoes a controlled burnout. Closing the primary
and secondary air flaps ensures that no air can flow
through the boiler in standby, thus preventing unused
heat from being drawn into the flue.
Optimum fuel efficiency with lambda control
Gasification of the wood (output) can be controlled via
the flow of primary air. Through use of the lambdacontrolled secondary air, combustion is kept clean and
highly efficient.
A lack of air means there is not enough oxygen for
complete combustion. On the other hand, too much air
also results in incomplete combustion as it cools the
fire. Below 700 °C, not all of the wood gas is burned.
11
Emission measurement
5
Emission measurement
Why measure emissions?
Perform emission measurement
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.
1. For emission measurement, the boiler must be
switched off with the [On/Off]
button.
There are several aspects of this that could go wrong,
resulting in incorrect measurements even though the
boiler fully and consistently complies with these limits
when operating in accordance with the relevant
standards.
Notes on emission measurement in Germany
In accordance with the provisions of "BImSchV,"
lower limit values for the emission measurement
in Germany apply to all new heating system installations starting 1 January 2015. Notes on compliance
are found under 12 "Low-emission operation".
Clean the boiler 3 - 5 days before the emission
measurement
Thoroughly clean the boiler and flue pipe 3 - 5 days
before the emission measurement. Once this is
complete, heating can resume as usual.
Fig. 5-1: Boiler switched on
2. In the boiler overview, click on the [MEAS.]
button. A settings window appears for the emission
measurement.
This delay between cleaning and measurement
is necessary in order to allow dust disturbed
during cleaning to settle again. If the chimney sweep
measures unsettled dust, the dust reading will be
higher than normal and thus inaccurate.
CAUTION!
 Under no circumstances clean the boiler and flue
pipe on the day of the measurement!
Ensure sufficient heat consumption
Open all radiator valves and turn radiator thermostats
to maximum.
Fig. 5-2: Settings window
1
Date and time of the planned measurement
2
Duration of the lock before the measurement
3
Start measurement immediately with selection
[Yes]
4
Cancel emission measurement or delete entered
values
In the settings window, the date and the time of the
emission measurement agreed (with the chimney
sweep) is entered. Also (if required) the duration
12
www.eta.co.at
Emission measurement
[Lock duration] can be adjusted. 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.
The [MEAS.] button is now illuminated green
and a countdown (3 hours for testing with full load)
is displayed. The emission measurement is to be
carried out during this period.
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. Once the time for the emission measurement is
set, the settings window is closed. Button [MEAS.]
now illuminates orange. The control system
automatically starts heating on time, so that the
measurement can be carried out at the set time.
The remaining time until the measuring time is
displayed in the orange lit button [MEAS.]. The
consumers must decrease the heat in the
meantime.
Fig. 5-4: Ready for emission measurement
5. Switch the boiler back to normal mode after the
emission measurement. To do this, open the
settings window and press the [Measurementdeactivate] button. If you do not press this button, the
boiler will automatically switch back to normal
mode after some time.
Fig. 5-3: Preparation for emission measurement
If the emission measurement should be
started immediately, this also takes place in
the settings window. To do this, for parameter [Start
now] set the selection to [Yes].
4. As soon as the boiler is ready for the emission
measurement, a corresponding message appears
on the screen.
13
General information
6
6.1
Safety
Safety
General information
Operation only by trained personnel
The product may be operated by trained adults only.
Training may be provided by the heating technician or
our customer service. Please read the associated documentation carefully in order to avoid errors during
operation and maintenance.
The product may not be operated by persons with
impaired physical, sensory, or mental capabilities.
Persons who lack experience and knowledge as well
as children may not operate, clean, or maintain the
product.
Keep children away from the fuel store and
storeroom
This action prevents the boiler temperature from rising
any more and activating further safety devices such as
the safety temperature limiter and thermal discharge
valve. The pump safety run is displayed on the screen
as operating mode [Heat dissipation].
The heat dissipation is limited by the maximum
flow temperature set in the heating circuits and
the target hot water temperature.
Install thermal emergency cooling valve against
overheating
The safety heat exchanger built into the boiler must be
connected by the heating technician to the house's
cold water supply via a thermal relief valve (opening
temperature 97 °C) to protect the boiler against
overheating if the pump fails. The minimum pressure in
the cold water pipe must be 2 bar.
In fuel stores for wood chips, in particular, there is a
danger that a hollow space may form above the
agitator. Children playing on the pile of wood chips, or
careless adults, could fall in and get buried or caught
up in the discharge screw.
Keep fire extinguishers in a clearly visible location
In Austria, the minimum requirement is an ABC
powder extinguisher with 6 kg. An AB foam extinguisher with 9 litres, which produces less damage when
used, is preferable. The fire extinguisher should be
kept outside the boiler room, visible and easily
accessible.
In Germany and Switzerland, fire extinguishers are not
required for heating systems in private residences. In
spite of this, we recommend having one in the house.
Storage of ash
The ash must be kept in non-flammable containers
with covers. Do not put hot ash in the waste bin due to
risk of fire.
6.2
Safety devices
Pump safety run, automatic heat dissipation at
overtemperature
If the boiler temperature exceeds 90°C (factory setting)
for any reason, the pump safety run will start. All
heating pumps and boiler pumps that are connected to
the boiler control are switched on to dissipate heat
from the boiler.
14
Fig. 6-1: Thermal emergency cooling valve
1
Cold water connection
2
Isolating valve; remove hand wheel
3
Strainer
4
Thermal emergency cooling valve
5
Visible outlet to sewer
The cold water supply must be connected to the upper
connector of the safety heat exchanger; the lower
connector serves as an outlet to the sewer. To prevent
the supply line from being shut off accidentally, remove
the levers from shut-off 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.
www.eta.co.at
Safety
Safety devices
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. No shut-off valve may be
installed between the boiler and the safety valve. If
solar or other heat sources provide energy to the buffer
storage tank via a heat exchanger, a safety valve (3
bar maximum) is also required on the buffer storage
tank.
Normally an expansion tank that is too small or
defective, or blocked heating lines, are the cause for
activation of the safety valve. The safety valve must be
on the boiler at the top of the flow in order to discharge
heat in an emergency. Only this way can it reduce
pressure by blowing out hot water and steam.
DANGER!
Safety valve outlet
The safety valve outlet must be directed to the ground
in a pipe so nobody is endangered by hot water or
steam.
 The safety valve outlet must be directed to the
sewer via a clearly visible, open route (siphon
funnel) so that malfunctions, especially a failure of
the safety valve to close, can be recognised. If no
sewer connection is available, the outlet must be
directed to the ground in a pipe.
15
Changing the fuel
7
Changing the fuel
Switch off boiler via mains switch
WARNING!
Enable flue gas recirculation for pellets and
miscanthus
 Switch off the electricity to the boiler via the mains
switch. This prevents injuries caused by switching
the boiler on inadvertently.
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.
Setting the firebed level sensor
Flue gas recirculation must be enabled for the
fuels mentioned above. This is done by removing
the shut-off plug.
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 behind the cover at the front of
the boiler.
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.
The settings for the various fuels are provided
under 7.2 "Settings".
Fig. 7-1: Firebed level sensor
To adjust the position, loosen the screw, turn the
firebed level sensor and fix it in place with the screw.
16
Fig. 7-2: Removing the maintenance cover
www.eta.co.at
Changing the fuel
Slag
Enable flue gas recirculation by taking out the shut-off
plug and fastening it to the boiler so it cannot be lost.
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.
Fig. 7-3: Shut-off plug
Inspect the seals on the maintenance cover and
the shut-off plug and replace them if necessary.
Causes of slag
Replace the maintenance cover and tighten it evenly.
The causes of slag can be divided into the following
categories:
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 8.2.3.2 "Flue gas recirculation".
For wood chips with more than 15% water content, flue
gas recirculation remains disabled.
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.
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 8.2.3.1 "Fuel".
7.1
Improper operation and maintenance of the boiler.
• Leaks in the boiler caused by improperly sealed
maintenance openings.
• Unsealed Lambda probe, defective seals on the
ash box, flue gas recirculation.
• Boiler and flue gas recirculation not regularly
cleaned, or flue gas recirculation does not work
due to high flue draught.
Incorrect control system settings
• Incorrect fuel settings
• De-ashing interval too long.
Slag
Generally speaking, the darker the wood chips,
the higher the proportion of dirt that will cause
What is slag?
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.
When the fuel causes slag
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
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 30.
17
Slag
Changing the fuel
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% (use button
in the boiler overview).
Raise the residual oxygen content O2 in the boiler
settings (use button
in boiler overview).
Install flue gas recirculation on the boiler
Check firebed level sensor, see 7.2 "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.
Increase residual oxygen content
In the boiler overview, click on the
button . Enter
the desired increase at parameter [Increase O2 target
value] in the settings window. This depends on the
water content of the wood chips, see following table.
Water content of wood chips
Increase by
< 15%
1.5 - 2.0%
15 - 25%
0.5 - 1.0%
> 25%
no increase
Tab. 7-1: Increase of residual oxygen content
If the increase does not improve the situation with
respect to slag formation, flue gas recirculation
should be retrofitted in order to sustainably lower the
combustion temperature.
18
www.eta.co.at
Changing the fuel
7.2
Settings
Settings
19
Changing the fuel
Adaptations for
HACK 110-130 kW
Fuel
Pellets
Water content
< 15%
Ash/dust content
Software parameters [Fuel]
low
high
Wood chips
< 15%
low
15 - 25%
high
low
[Pellets]
Carpentry material
Miscanthusa
< 15%
< 20%
25 - 35%
high
low
high
[Woodchips]
low
high
low
high
[Woodchips]
[Miscanthus]
4
5
Firebed level sensor
Position
2
4
5
De-ashing interval (boiler with buffer storage tank)
Software parameters
[De-ash after min.]
90 kg
32 kg
45 kg
12 kg
45 kg
12 kg
45 kg
12 kg
23 kg
12 kg
3 kg
3 kg
[De-ash after max.]
150 kg
113 kg
100 kg
50 kg
100 kg
50 kg
100 kg
50 kg
100 kg
50 kg
19 kg
15 kg
De-ashing interval (boiler without buffer storage tank)
Software parameters
[De-ash after min.]
90 kg
64 kg
45 kg
23 kg
45 kg
23 kg
45 kg
36 kg
45 kg
23 kg
7 kg
7 kg
[De-ash after max.]
150 kg
113 kg
100 kg
50 kg
100 kg
50 kg
100 kg
50 kg
100 kg
50 kg
19 kg
15 kg
Boiler with flue gas recirculation installed
Software parameters [Flue gas recirculation]
[Yes]
[Yes]
[Yes]
(recommended)
[Yes]
[No]
[Yes]
[Yes]
Flue gas recirculation status
Open
Open
Open
(recommended)
Open
Closed
Open
Open
Boiler without flue gas recirculation
Software parameters [Flue gas recirculation]
[No]
a. Reduced max. output: 90 kW
20
Operation
8
User interface
Operation
8.1
User interface
8.1.1
Overview
Toolbox
Toolbox for the specialist.
Help
Touchscreen user interface
The touchscreen only displays function blocks that are
required and configured to work with your heating
system.
Displays additional information for a parameter
selected in the text menu. If additional
information is available, the symbol in the
button changes to
.
8.1.2
Setting the date and time
Explanation
The ETAtouch control system allows you to adjust the
date and time to suit your respective time zone.
The date and time are factory-set to Central
European Time (UTC+01:00).
Changing the date and time
Press the
button to open the function block
overview screen.
Tap on the date or time at the bottom right-hand corner
of the touchscreen.
1
Menu buttons
2
Heating system function blocks
3
Date and time
4
Remote control (meinETA)
Overview
Displays an overview screen of the selected
function block.
Text menu
Allows you to change parameters of the
selected function block.
I/O menu
Enables a specialist to assign inputs and
outputs and manually operate the outputs of the
selected function block.
Messages
Messages of the selected function block (notifications, warnings or errors)
21
User interface
Operation
A settings screen opens:
A keypad is displayed:
By tapping on [Day:], [Month:], [Year:] or [Time:], you
can select the parameter that you wish to change.
Enter the new name and press [Accept] to save.
Enter the new value and press [Accept] to save.
8.1.3
To cancel the process and keep the original
name, press [Cancel].
Changing the names of function
blocks
Renaming function blocks
You can individually adapt the names of function
blocks to make them easier for you to recognise.
If you are changing the names of function blocks,
bear in mind that they should be kept short. This
will make the touchscreen clearer.
Changing a name
Tap [HC] twice to rename this function block.
A small menu window opens:
Tap [Change name].
22
www.eta.co.at
Operation
8.1.4
User interface
Text menu navigation
Press
to switch to the function block's text menu.
The parameter can be found under:
Using the text menu
For each function block, there is a text menu. In this
window, the available parameters are displayed and
can be changed if necessary.
If additional information is available for a selected
parameter, the symbol in the button changes to
.
This additional information is displayed when you
press the
button.
Only modify parameters if you know what their
function is. Before any changes, read the
relevant section of the user manual or configuration
manual, or the additional information displayed when
you press
. If you cannot find sufficient information
about a parameter, please consult a specialist.
Heating circuit
Day heat. lim.
It is possible to modify certain parameters in
order to adapt the heating system to your needs.
When you select a parameter that can be changed, the
[Value] field changes to the [Change] button.
Press the [Change] button or tap the parameter twice
to open a settings window:
Text menu overview screen
Press the
button and [HC], for example, to open
the text menu of this function block.
1
Name of the parameter
2
Factory settings
3
Adjustment range (minimum and maximum value)
Enter the new value and press the [Accept] button to
save.
Press the
button to return to the overview window
of the function block.
1
Submenu opens
2
[Value] or [Change]
3
Selected parameter
4
Submenu is available
Modifying parameters
Example: Change the [Day heat. lim.] parameter in the
[HC] function block.
First, press [HC] to select the function block.
23
User interface
8.1.5
Operation
Setting a time window
Setting time window and temperatures
The time window is set with the timer for charging the
tank (for example for accumulator tank and hot water
tank), or the operating times (for example for the
heating circuit).
Set the individual time windows and temperatures by
tapping the lines [Time slot 1:], [Time slot 2:], [Time slot
3:] and [Set-back temperature between time slots:]. A
settings window appears after tapping.
Fig. 8-2: Settings window
Enter the time window and desired temperature and
press [Accept] to save. Set the further time windows
the same way.
1
Press the [Delete] button to delete a set time
window and restore the factory settings.
Timer to set a time window
Setting a time window and the hot water
temperature for the hot water tank will be
described in the following. This example applies
accordingly for all other function blocks with timers.
To
set
the
charging
times,
tap
timer in
the
the
Copying time windows
After you have set the time windows, you can copy
them for other days of the week. To do this, tap the
[Copy] button in the overview screen.
overview. An overview opens.
Fig. 8-3: Overview
Fig. 8-1: Overview
24
www.eta.co.at
Operation
User interface
A screen opens showing the individual days of the
week.
8.1.6
Messages
Overview of messages
Press the
button to go to the messages overview
of the selected function block.
Fig. 8-4: Copying time windows
Make your selection and press the [Accept] button to
save.
1
Symbol for the highest priority type of all occurred
messages
2
Symbol for the type of individual message
3
Button for acknowledging a message
4
Brief description of the message
5
Detailed description of the message
In the event of an error, alarm or warning in a function
block, the symbol of the
button changes.
The possible states are:
•
No messages present
•
There is a warning
•
There is an error or alarm
Types of message
•
Notification
A notification does not interrupt operation, and
therefore no acknowledgement is required. Notifications inform the user, for example, that pump
anti-blocking protection has been activated.
•
Warning
A warning is displayed on failure of a function that
is not absolutely essential for continued operation.
It can be acknowledged before the cause of failure
is remedied. However, it will continue to be
displayed until the cause has actually been dealt
with.
•
Error, alarm
An error or alarm stops operation. Some of these
can be acknowledged before the cause of the
problem is remedied. However, they will continue
to be displayed until the cause has actually been
dealt with.
25
User interface
Operation
Other errors and alarms can only be acknowledged after the cause has successfully been
remedied. You can then delete these messages
with the [Confirm later] button.
Once an error or alarm has been resolved and acknowledged, you must restart the boiler or the
affected heating circuit by pressing the [On/Off]
button.
Acknowledging an error
Press the
button to open the message window of
the selected function block.
Select the message that you wish to acknowledge.
When you press [Conf.] or tap the row twice, a notice
appears.
Press [OK] to acknowledge the message and delete it
from the list.
Acknowledging all errors
Tap [Boiler] twice to acknowledge all errors for this
function block. A small menu window opens. Tap on
the [Confirm error] field in this window.
26
www.eta.co.at
Operation
User interface
27
Function block [Boiler]
8.2
Function block [Boiler]
8.2.1
Overview
Boiler overview
Press the
button and [Boiler] to open the boiler
overview window.
Switching the boiler on and off, additional de-ashing as
well as emission measurement are all detailed in this
overview.
Operation
[ASH] button
This button starts boiler de-ashing. If the boiler
is in operation, burnout first takes place when
this button is pressed, and de-ashing only after
this. If the boiler is switched off or on standby, deashing can be started straight away.
Boiler settings
Pressing this key brings up a settings window
to adjust the de-ashing interval of the boiler and
the
residual
oxygen
content.
These
adjustments can also be made in the text menu.
Buffer storage tank charging
This symbol is displayed next to the boiler as soon
as it supplies heat to the buffer.
Boiler functionality
Press the [On/Off]
button to switch the boiler on
and off. When the boiler is switched on, heating starts
as soon as there is demand from the connected
consumers (either the buffer, the heating circuits or the
hot water tank).
The control system calculates the required boiler
temperature based on the flow temperatures
demanded by the consumers. If the boiler is supplying
heat to the buffer, the
symbol appears in the
overview window.
1
Boiler temperature
2
Operating status
3
Buffer
4
[MEAS.] key
5
Boiler settings
6
[On/Off] key
7
[ASH] key
8
Outside temperature
9
Return temperature
[On/Off] button
This button switches the boiler on and off. If the
boiler is on, this button appears green
.
[MEAS.] button
A setting window for the emissions
measurement of the boiler will open by clicking
this button. Here, you can set a time for the
emissions measurement, or it can be started immediately.
The minimum running time for a boiler heating phase
is 10 minutes. If there is no more demand from the
consumers after that time, the boiler stops heating with
a burnout. The operating mode changes to [Ember
burnout] and then to [Ready].
Boiler de-ashing takes place within a configurable
interval; see page 30.
De-ashing can also be disabled for a time, e.g. to
prevent the boiler from de-ashing at night; see
page 30.
After an adjustable amount of fuel is consumed, a
reminder to empty the ash box can be issued; see
page 30.
8.2.2
Operating modes
Switched off
The boiler is off. The [On/Off]
overview screen lights up red.
button in the
Warm Start
An attempt is made to ignite the fuel without the
electrical ignition using only the heat stored in the
combustion chamber.
28
www.eta.co.at
Operation
Igniting
Function block [Boiler]
8.2.3
Text menu
The fuel is ignited using the electrical ignition.
Adjustable parameters
Heating
The boiler is in heating mode and is channelling heat
to the consumers.
Ember burnout
In function block [Boiler], switch to the text menu with
the
button.
Boiler
At the end of the heating phase, the fuel that is still on
the grate is burnt off. No more fuel is fed into the boiler.
Settings
Fuel
Flue gas recirculation
Ashbox missing
The ash box is not connected to the boiler.
Ash removal
Ready
De-ash after min.
When ember burnout is complete, the still switched-on
boiler is in standby waiting for a heating demand.
De-ash after max.
Begin idle time WT cleaning
Idle time during WT cleaning
De-ash
The boiler is de-ashing.
Malfunction during ash removal
The ash screw has been switched off due to excessive
current consumption. This may be due to a full ash box
or blockage of the ash screw by foreign objects.
Malfunction
A malfunction has occurred, preventing the boiler from
heating. The cause can be found in the list of error
messages.
Ember burnout due to a malfunction
The current heating phase has ended with ember
burnout due to a malfunction.
Ember burnout due to external locking
Due to an external lockout (Stop command), the
current heating phase has ended with ember burnout.
Locked
Heating not possible, as the boiler has been locked
externally (Stop command).
Calibrating lambda probe
The lambda probe is undergoing automatic calibration.
It is not possible for the unit to heat whilst in this mode.
emptying Stoker
When the heating phase is over, the fuel feed runs
empty in order to empty the stoker.
Empty ash box after
Detailed descriptions of the parameters are provided
below.
8.2.3.1
Fuel
Explanation [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 ash removal.
This parameter is factory-set to [Woodchips].
Modifying parameters
The parameter can be found under:
Boiler
Settings
Fuel
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
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.
29
Function block [Boiler]
8.2.3.2
Flue gas recirculation
Operation
8.2.3.4
Setting the idle time for heat exchanger
de-ashing
Explanation of [Flue gas recirculation]
When the fuel setting is changed in the control system,
the status of the flue gas recirculation is adjusted automatically.
If the fuel is set to [Pellets] or [Miscanthus], the
setting for flue gas recirculation is changed to
[Yes].
If the fuel is [Woodchips], the setting is [No].
However, if wood chips with less than 15% water
content are used, the [Yes] setting must be made
manually.
Explanation of [Begin idle time WT cleaning] and
[Idle time during WT cleaning]
The [Idle time during WT cleaning] parameter is used
to select the duration of the idle time for heat
exchanger de-ashing.
The start time for the idle time is set with the [Begin idle
time WT cleaning] parameter.
The factory settings are 10 hours for the duration
and 9:00 PM for the start time.
Setting the heat exchanger idle time
Checking the setting
The parameters can be found under:
The parameter can be found under:
Boiler
Boiler
Ash removal
Settings
Begin idle time WT cleaning
Flue gas recirculation
8.2.3.3
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.
Changing the de-ashing interval
Open the settings by pressing the
button in boiler
overview. A settings window will open. Select the
desired parameter in this. Enter the new value and
press [Accept] to save.
Idle time during WT cleaning
Select the parameter and press the [Change] button. A
settings window will open.
Enter the duration or start time and press [Accept] to
save.
8.2.3.5
Empty ash box after
Explanation [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.
The factory setting for this value is 0 kg, so the
reminder does not appear.
Modifying parameters
The parameter can be found under:
The de-ashing interval can also be changed in the
text menu. The parameters can be found under:
Boiler
Ash removal
Empty ash box after
Boiler
Ash removal
De-ash after min.
Select the parameter and press the [Change] button. A
settings window will open.
De-ash after max.
Enter the value and press the [Accept] button to save.
The de-ashing interval may only be modified after
consultation with a specialist or ETA customer
service.
30
www.eta.co.at
Operation
Function block [Boiler]
31
[Buffer] function block
8.3
[Buffer] function block
8.3.1
Overview
Buffer storage tank overview screen
Press the
button and [Buffer] to open the overview
screen of the buffer storage tank. Here the current temperatures, operating mode and charging status are
displayed.
Operation
If a combination tank is installed, the symbol is
shown at the top of the buffer when the hot water
rapid charge function is active. If the buffer is charged
below the hot water section, the symbol appears in the
centre of the buffer.
Charging by the solar heating system
Optional: for solar heating system
This symbol indicates that the tank is
being charged by the connected solar
heating
system.
The
displayed
temperature corresponds to the temperature of the
collector.
Timer [BufferChrgTimes]
This timer displays the configured charging times for
the current day for charging the buffer. These time
windows are displayed as a black bar in the timer.
This timer only applies to the charging of the
buffer storage tank, not for a solar heating
system, if one is connected.
Timer [HW charging times]
Optional: for [Combin. tank]
1
Operating condition
2
Buffer charging status
3
Temperature: [Buffer top]
4
Temperature: [Buffer middle]
With a combination tank, this timer displays the
configured charging times for charging the hot water
on the current day. These time windows are displayed
as a black bar in the timer.
5
Temperature: [Buffer bottom]
6
Charging by solar heating system, temperature
[Collector]
[Extra charge] button
7
Timer: [BufferChrgTimes]
8
Temperature: [Buffer bottom Solar]
9
Charging by boiler
With a combination tank, this button enables
the hot water section to be charged to the
configured hot water temperature outside the
set time slot if the temperature has dropped below
[Switch-on diff.].
Buffer charging status
By means of the 3 temperature sensors on the buffer,
the current charging status is determined and
displayed in the overview screen.
A charging status of 0% means that the buffer has only
been charged to the configured [Return from
consumers] temperature, or lower.
100% means that the buffer has been charged up to
the currently required [Buffer target] temperature.
Charging by boiler
Optional: for [Combin. tank]
How the buffer storage tank works
You can set different time slots inside which the boiler
can charge the buffer (see page 36). Inside a time slot,
the control system establishes the required buffer
temperature [Buffer target] based on the current
demand from the consumers (heating circuit, hot water
tank...).
By means of the 3 temperature sensors on the buffer,
the current charging status is determined and
displayed in the overview screen.
This symbol is displayed when the buffer is
being charged by the boiler.
32
www.eta.co.at
Operation
[Buffer] function block
The buffer is charged by the boiler until the current
[Buffer top] temperature has exceeded the required
[Buffer target] temperature, and the configurable [Buff.
bottom off] temperature (see page 38) has also been
exceeded. The operating state of the buffer then
changes to [Charged].
The [Solar prio.] function enables the solar heating
system to charge the buffer without the boiler being
started, inside 2 configurable time slots (see page 40).
If there is no demand from consumers, inside the set
time slot the buffer is charged to the configurable
minimum temperature [Buffer top min.] (see page 37).
Buffer with solar heating system
Optional: only for [Solar charging]
The additional temperature [Buffer bottom Solar] is
displayed at the bottom of the overview screen, in the
buffer storage tank.
Fig. 8-5: Buffer with solar heating system
1
Temperature [Buffer top]
2
Temperature [Buffer middle]
3
Temperature [Buffer bottom]
4
Temperature [Buffer bottom Solar]
5
Charging by solar heating system, temperature
[Collector]
Solar charging of the buffer is controlled by switching
the solar panel pump on and off. Solar charging begins
as soon as the [Collector] temperature is 5°C higher
than the [Buffer bottom Solar] temperature. The solar
charging symbol
appears in the overview
screen.
If the [Collector] temperature falls below the [Buffer
bottom Solar], solar charging ends with the solar panel
pump switching off.
The configurable [Buffer bottom max] temperature sets
the limit for buffer charging by the solar heating system
to prevent the buffer from overheating (see page 40).
33
[Buffer] function block
Operation
Buffer with solar heating system and stratified
charging valve
Combination tank (buffer with integrated hot water
tank or coil)
Optional: only with [Solar charging] and [... additional
solar charging in buffer middle]
Optional: for [Combin. tank]
The two temperatures [Buffer top Solar] and [Buffer
bottom Solar] are displayed in the overview screen.
If a combination tank (i.e. a buffer with integrated hot
water tank or internal water heat exchanger) is
installed, the hot water temperature is shown in the
overview screen in the upper part of the buffer.
Additionally, a second timer [HW charging times] is
displayed, which is used to set the hot water temperatures and charging times (see page 36). The [Extra
charge]
button is also displayed, for charging hot
water outside the time slots.
Fig. 8-6: Buffer with solar heating system and stratified
charging valve
1
Temperature [Buffer top]
2
Temperature [Buffer middle]
3
Temperature [Buffer bottom]
4
Temperature [Buffer top Solar]
5
Charging by solar heating system, temperature
[Collector]
6
Temperature [Buffer bottom Solar]
The stratified charging valve on the buffer storage tank
switches solar charging between [Buffer bottom] and
[Buffer top]. During this process, the [Buffer top Solar]
and [Buffer bottom Solar] temperatures are continuously compared with the current [Collector] temperature.
Fig. 8-7: Combination tank
1
Timer [HW charging times]
2
Temperature [Hot water tank]
3
[Extra charge] button
The configurable [Switch-on diff.] parameter additionally allows you to determine how far the current [Hot
water tank] temperature can drop before the hot water
tank again demands heat from the buffer (see
page 41).
The solar charging symbol
is shown at
the top or centre of the buffer, depending on
which part of the buffer is currently being charged.
34
www.eta.co.at
Operation
8.3.2
[Buffer] function block
Operating modes
Charged
The buffer is charged to the required [Buffer target]
temperature, and the [Buffer bottom] temperature
sensor has exceeded the configurable [Buff. bottom
off] temperature once.
ChargeBuffer
The combination tank is demanding heat from the
boiler.
Charge hot water
Only the hot water section of the combination tank is
demanding heat. Only the upper section of the
combination tank is being charged.
Demand
The buffer is demanding heat from the heat producer.
Solar heat diss.
Chrg.
Excess heat is being taken from a buffer that is being
charged by a solar heating system.
The boiler is supplying heat to the buffer.
FreezeProt
A temperature sensor in the tank has fallen below the
[FreezeProt] temperature.
The frost protection limit is factory-set to 5°C.
ResidHeat
After the boiler heating phase, its residual heat is
conveyed to the tank.
Heat dissipation
The tank is being charged to discharge excess heat
from the boiler.
Sensor error
A temperature sensor is faulty. You can find this
temperature sensor in the message list by pressing the
button.
Timer off
There is demand by the tank, but the current time is
outside the time slot configured in the timer. The tank
is therefore not charged.
Extra hot water charge
The [Extra charge] button has been pressed to activate
extra charging outside a time slot when a combination
tank is installed.
Solar prio.
Solar priority has been activated, and tank charging by
the boiler is disabled. The current time is inside a
configured time slot for solar priority, and the current
outside temperature is higher than the set temperature
[Min. out. temp. Solar prio.].
35
[Buffer] function block
8.3.3
Operation
Setting the accumulator tank charging times
Operation
To set the charging times, tap the [HW charging times]
timer in the
overview. A screen opens.
With the [BufferChrgTimes] timer, you can set 3
different time windows for the accumulator tank for
each day of the week. The accumulator tank is only
charged by the boiler within a time window. The sole
exception is the [Heat dissipation] operating condition.
To set the charging times, tap the [BufferChrgTimes]
timer in the
overview. A screen opens.
Fig. 8-9: Overview of hot water charging times
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Setting circulation times with combination tank
Optional: only for combination tank with circulation
pump
Fig. 8-8: Overview screen of set charging times
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Setting charging times and temperature for hot
water with a combination tank
With the combination tank, the additional [HW
charging times] timer is used to set 3 different time
windows and temperatures for the hot water for each
day of the week.
Within a time window, the hot water is charged to
the set temperature. Outside a time window, the
hot water is charged to the set temperature [Set-back
temperature between time slots:].
With a combination tank, the settings of the
circulation times are made in the text menu. You
can set 3 different time windows for the circulation
times of the circulation pump for each day of the week.
Press
to switch to the function block's text menu.
The time windows are in:
Buffer
Hot water tank
Circulation
Circulation times
The individual weekdays are listed.
Select a weekday and in the submenu select the
desired time window [Time slot 1], [Time slot 2] or
[Time slot 3]. Press [Change] to open the settings
window.
Set the circulation times to be as short as
possible to ensure good buffer stratification and
prevent limescale build-up.
36
www.eta.co.at
Operation
8.3.4
[Buffer] function block
Text menu
at buffer bottom sol.
Adjustable parameters
Priorityc
The following parameters can be configured for the
basic function in the buffer text menu.
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
Buffer
c. Only for solar heating systems with switchover between
several tanks
Buffer top
Buffer top min.
Buffer bottom
If the buffer is implemented as a combination tank,
further parameters can be set.
Buff. bottom off
Hot water tank
Extra charge
Switch-on diff.
Buffer top min.
Buff. bottom off
Circulation
Extra charging from
Circulation runtime
ChrgButton
Circulation pause
If a solar heating system is additionally connected to
the buffer, further parameters can be set.
Enable circulation
Detailed descriptions of the parameters are provided
below.
8.3.4.6
Buffer
Solar heat diss.
Buffer top min.
a
Activate?
Explanation of [Buffer top min.]
...until buffer max
This parameter defines the minimum temperature of
the buffer storage tank inside the configured time slot.
Buffer top Solarb
Buffer top min. solar
Min. out. temp. Solar prio.
Priority
Buffer bottom Solar
Buffer bottom max
Solar prio.
Solar prio.
Begin solar prio.
Change priority at
End solar prio.
Min. out. temp. Solar prio.
This parameter is factory-set to 10°C. The higher
this temperature is set, the larger the heat
reserve in the buffer. At the same time, however,
higher temperatures in the buffer also 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.
Modifying parameters
The parameter can be found under:
Extra solar heat
from outside temp.
at buffer top
Buffer
Buffer top
Buffer top min.
37
[Buffer] function block
Select the parameter and press the [Change] button. A
settings window will open.
Operation
Setting the function
The parameters can be found under:
Enter the value and press the [Accept] button to save.
8.3.4.7
Buff. bottom off
Buffer
Extra charge
Explanation of [Buff. bottom off]
Extra storage activated?
This parameter ends charging of the buffer storage
tank by the boiler. As soon as the [Buffer bottom]
temperature sensor in the buffer storage tank has
exceeded the configured [Buff. bottom off] temperature, charging of the buffer by the boiler is stopped.
This parameter is factory-set to 40°C. The value
should be at least 5 - 10°C above the average
return temperature of the consumers, but no more than
70°C.
A high [Buff. bottom off] temperature reduces the
number of boiler starts and improves boiler running
time.
Modifying parameters
The parameter can be found under:
Buffer top min.
Buff. bottom off
Extra charging from
ChrgButton
At first, set the parameter [Extra storage
activated?] to [Yes], than the other parameters
will be displayed.
Select temperatures [Buffer top min.], [Buff. bottom off]
and the time [Extra charging from] and press [Change].
In the settings window, set the desired values and save
them with [Accept].
To immediately start this additional buffer charge,
simply set parameter [ChrgButton] to [On].
8.3.4.9
Buffer
Explanation of the [Solar heat diss.] function
Buffer bottom
Buff. bottom off
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.3.4.8
Solar heat diss.
Function [Extra charge]
Explanation of the [Extra charge] function
This function defines a daily point in time for the buffer
(=[Extra charging from]) to charge the buffer additionally. This charging is done independently of the actual
consumer requirements and independently of the set
time windows.
A separate minimum temperature [Buffer top min.] and
shutdown temperature [Buff. bottom off] can be set for
this charge. Charging ends as soon as the buffer
reaches these temperatures.
The function is deactivated if one of the two temperatures is set to "0".
Optional: Only for several buffer storage tanks and
solar heating system
This function defines whether the selected buffer may
take up excess solar heat from a buffer charged by the
solar heating system.
If you set the function with the [Activate?] parameter
set to [Yes], this buffer takes up the solar excess. This
buffer is then charged up to the configured maximum
temperature [...until buffer max].
As the factory setting, this function is switched off
and the maximum temperature [...until buffer
max] is limited to 70°C .
Activating the function
The parameter can be found under:
Buffer
Solar heat diss.
Activate?
...until buffer max
Select the parameter and press the [Change] button. A
settings window will open.
38
www.eta.co.at
Operation
[Buffer] function block
Make your selection and press the [Accept] button to
save.
8.3.4.10
Priority of the upper and lower sections
Explanation of [Priority]
Optional: Only with solar heating system and buffer
with 2 internal coils
This parameter sets the priority of the top and bottom
sections of the buffer for solar charging. A high priority
means that this section will be charged by the solar
heating system first. A low priority means that it will be
charged last.
However, this minimum temperature only applies
if the conditions for stratified charging are
satisfied. If they are not, solar charging is switched to
the bottom section of the buffer, to make use of the
solar energy.
This parameter is factory-set to 30°C.
Modifying parameters
The parameter can be found under:
Buffer
Buffer top Solar
The priority for the top section is factory-set to
[High], and to [Middle] for the bottom section.
Modifying parameters
The priority for the top section is under:
Buffer top min. solar
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.3.4.12
Min. out. temp. Solar prio.
Buffer
Buffer top Solar
Priority
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
Set the priority for the bottom section of the buffer
in the same way. You will find this in:
Buffer
Explanation of [Min. out. temp. Solar prio.]
This parameter sets the minimum value for the outside
temperature, so that one of the conditions for solar
priority and stratified charging of the buffer storage
tank is satisfied.
This value is factory-set to 10°C.
Modifying parameters
The parameter can be found under:
Buffer
Buffer bottom Solar
Buffer top Solar
Priority
8.3.4.11
Buffer top min. solar
Min. out. temp. Solar prio.
or also in:
Explanation of [Buffer top min. solar]
Optional: Only for solar heating panels with stratified
charging
With stratified charging by the solar heating system,
this sets a minimum temperature for the top section of
the buffer.
This way, solar charging only takes place in the top
section once the solar panel is at least 7°C warmer
than [Buffer top min. solar].
Buffer
Buffer bottom Solar
Solar prio.
Min. out. temp. Solar prio.
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
39
[Buffer] function block
8.3.4.13
Buffer bottom max
Operation
Setting a time window
The parameters for setting the 2 time windows are in:
Explanation of [Buffer bottom max]
Optional: Only with solar heating systems
This switch-off temperature can only be set when the
solar heating system is charging the buffer. This configurable temperature sets a threshold for how much
the buffer can be charged by the solar heating system,
in order to prevent the buffer from overheating. If the
[Buffer bottom Solar] temperature sensor reaches the
configured [Buffer bottom max] temperature, the solar
panel pump of the solar heating system is switched off.
This parameter is factory-set to 90°C.
Buffer
Buffer bottom Solar
Solar prio.
Begin solar prio.
Change priority at
End solar prio.
Select the parameter and press the [Change] button. A
settings window will open.
Modifying parameters
Enter the value and press the [Accept] button to save.
The parameter can be found under:
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.
Buffer
Buffer bottom Solar
Buffer bottom max
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.3.4.14
During the configured priority times, it may be the
case that the heating circuits or the hot water are
not supplied with sufficient heat.
Switch function on or off
The parameter can be found under:
Solar prio.
Buffer
Explanation of [Begin solar prio.], [Change priority
at] and [End solar prio.]
Buffer bottom Solar
Solar prio.
Optional: Only with solar heating systems
These parameters set the time slots for the [Solar prio.]
function.
The first time slot lasts from [Begin solar prio.] to
[Change priority at]. The second time slot begins with
[Change priority at] and ends with [End solar prio.].
Outside the 2 time slots, the boiler can charge the
buffer at any time.
Set the start of solar priority before the first time
slot of the heating circuit and hot water tank.
Otherwise, the boiler may start beforehand, in order to
charge the heating circuit or hot water tank.
During the configured times for solar priority, it
may happen that the heating circuits or the hot
water are not supplied with sufficient heat.
Solar prio.
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
8.3.4.15
Extra solar heat
Explanation of [Extra solar heat]
Optional: Only with solar heating systems
This function defines whether the buffer storage tank
may convey this excess heat from the solar heating
system to other consumers, even if they do not
currently require any heat.
The following conditions must be met in order for
the excess solar heat to be passed on in this way:
•
40
The outside temperature must have exceeded the
configurable value [from outside temp.] (factory
setting 10°C).
www.eta.co.at
Operation
•
•
•
[Buffer] function block
The [Buffer top] temperature in the buffer must
have exceeded the configurable value of [at buffer
top] (factory setting 100°C).
The [Buffer bottom Solar] temperature in the buffer
must have exceeded the configurable value of [at
buffer bottom sol.] (factory setting 50°C).
In the function block for the hot water tank, heating
circuits or other buffer storage tanks. the [Solar
heat diss.] parameter must be set to [Yes], so that
the buffer can request these consumers to take on
the excess solar heat.
The parameters [from outside temp.], [at buffer top]
and [at buffer bottom sol.] can be configured in the
buffer text menu.
The [Solar heat diss.] parameter can be configured in
the text menu of the [HW] or [HC] function block.
Changing the conditions
The parameters can be found under:
Buffer
Buffer bottom Solar
Extra solar heat
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
8.3.4.17
Switch-on diff.
Explanation of [Switch-on diff.]
Optional: only with combination tank
With a combination tank, this parameter regulates how
far the current [Hot water tank] temperature can fall
before the hot water tank again demands heat from the
boiler.
The factory setting for this parameter is 15 °C.
The current [Hot water tank] temperature may
therefore fall 15 °C from the [Hot water tank target]
value. The combination tank does not demand heat
from the boiler unless this happens.
With a combination tank, this value can be set to
approximately 5 °C to 8 °C if the amount of hot
water is insufficient.
Modifying parameters
The parameter can be found under:
from outside temp.
at buffer top
at buffer bottom sol.
Hot water tank
Switch-on diff.
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.3.4.16
Priority of the buffer
8.3.4.18
Explanation of [Priority]
Optional: Only for solar heating systems with
switchover between several tanks
This parameter sets the priority for solar charging of
the buffer. A high priority means that this tank will be
charged by the solar heating system first. A low priority
means that it will be charged last.
The priority for the buffer is factory-set to [Middle].
Modifying parameters
The parameter can be found under:
Circulation runtime
Optional: only for combination tank with circulation
pump
Explanation of [Circulation runtime]
Optional: Only with circulation pump
This parameter sets the duration for operation of the
circulation pump after it has been started. This period
is only valid inside the set time slot.
After the set period has expired, the circulation
pump is switched off for the configurable duration
of the [Circulation pause] parameter.
Buffer
Priority
41
[Buffer] function block
Modifying parameters
The parameter can be found under:
Operation
Modifying parameters
The [Service] access level is required to perform
modifications.
The parameter can be found under:
Hot water tank
Circulation
Circulation runtime
Select the parameter and press the [Change] button. A
settings window will open.
Hot water tank
Circulation
Enable circulation
Enter the value and press the [Accept] button to save.
Select the parameter and press the [Change] button. A
settings window will open.
8.3.4.19
Enter the value and press the [Accept] button to save.
Circulation pause
Optional: only for combination tank with circulation
pump
Explanation of [Circulation pause]
Optional: Only with circulation pump
This parameter sets the period (pause) after a
circulation pump operating phase. The control system
can only restart the circulation pump after this time has
elapsed. This pause is only valid inside the set time
slot.
Modifying parameters
The parameter can be found under:
Hot water tank
Circulation
Circulation pause
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.3.4.20
Enable circulation
Optional: only for combination tank with circulation
pump
Explanation of [Enable circulation]
Optional: Only with circulation pump
This parameter defines the minimum temperature of
the hot water tank for starting the circulation pump. The
circulation pump only starts once the hot water tank
has exceeded this temperature.
This value is factory-set to 40°C.
42
www.eta.co.at
Operation
[Buffer] function block
43
[Hot water tank] function block
8.4
[Hot water tank] function block
8.4.1
Overview
Hot water tank overview screen
Press the
button and [HW] to open the hot water
tank overview screen. Here, the current temperatures
and operating mode are displayed.
Operation
This symbol indicates that the tank is
being charged by the connected solar
heating
system.
The
displayed
temperature corresponds to the temperature of the
collector.
Hot water tank with solar heating system
Solar charging of the hot water tank is controlled by the
solar panel pump switching on and off. Solar charging
begins as soon as the [Collector] temperature is 7°C
higher than the [Hot water tank bottom] temperature.
The solar charging symbol
appears in the
overview screen.
If the difference between the [Collector] and [Hot water
tank bottom] temperatures is less than the threshold
value of 3°C, solar charging stops.
Timer [HW charging times]
This timer displays the set charging times of the
current day for charging the hot water tank. These time
windows are displayed as a black bar in the timer.
Timer [Circulation times]
Optional: for [Circulation pump]
1
Operating mode
2
Charging by boiler
3
Temperature: Hot water
4
Charging by solar heating system
5
[Extra charge] button
6
Temperature: Hot water tank bottom
7
Timer: ChrgTimes
[Extra charge] button
This button causes the hot water tank to be
charged to the highest set temperature of all
time slots and days of the week if the
temperature has dropped below [Switch-on diff.],
ignoring the current time slot.
Charging by boiler or buffer
This symbol is displayed when the hot
water tank is being charged by the boiler or
buffer.
The displayed temperature is the [Boiler] or [Buffer top]
temperature.
Charging by the solar heating system
This timer displays the set times of the current day to
operate the circulation pump. These time windows are
displayed as a black bar in the timer.
Lower part of hot water tank
Optional: For [Hot water tank bottom] or [Solar]
The temperature in the lower part of the hot water tank
is only displayed if the additional temperature sensor
[Hot water tank bottom] is installed.
How the hot water tank works
You can set different time slots and temperatures for
each day of the week for charging the hot water tank.
Inside a time slot, the hot water tank is charged to the
configured temperature (see page 46).
Charging commences as soon as the current [Hot
water] temperature is below the temperature set in the
timer by the configurable value [Switch-on diff.]. The
hot water tank then demands heat from the buffer or
boiler.
Charging ends as soon as the current [Hot water]
temperature has reached the temperature set in the
timer. The operating mode then changes to [Charged].
Optional: for solar heating system
44
www.eta.co.at
Operation
[Hot water tank] function block
If an additional temperature sensor [Hot water
tank bottom] is installed for the lower part of the
hot water tank, charging ends as soon as this sensor
has reached the configurable temperature [HW bottom
off].
Timer off
If you also wish to charge the hot water tank outside
the time slot, press the [Extra charge]
button.
Solar prio.
If a circulation pump is configured for the hot water, a
second timer [Circulation times] is displayed for setting
the operating times.
8.4.2
Operating modes
There is demand by the tank, but the current time is
outside the time slot configured in the timer. The tank
is therefore not charged.
Solar priority has been activated, and tank charging by
the boiler is disabled. The current time is inside a
configured time slot for solar priority, and the current
outside temperature is higher than the set temperature
[Min. out. temp. Solar prio.].
Solar heat diss.
Demand
The hot water tank demands heat from the buffer or
boiler. If the boiler is switched on and the buffer is
unable to deliver sufficient heat, the boiler switches to
heating mode.
Excess heat is being taken from a buffer that is being
charged by a solar heating system.
Chrg.
The hot water tank is being charged by the boiler or
buffer.
Extra charge
The [Extra charge] was pressed for charging the hot
water tank outside the set time slots.
Delay
The charging pump of the hot water tank continues
running briefly to discharge excess heat from the
boiler.
Charged
The hot water tank has reached the set temperature
[Hot water tank target].
Heat dissipation
The tank is being charged to discharge excess heat
from the boiler.
FreezeProt
A temperature sensor in the tank has fallen below the
[FreezeProt] temperature.
The frost protection limit is factory-set to 5°C.
Sensor error
A temperature sensor is faulty. You can find this
temperature sensor in the message list by pressing the
button.
45
[Hot water tank] function block
8.4.3
Operation
Set charging times and temperatures for the hot
water tank
Operation
To set the circulation times, tap the [Circulation times]
timer in the
overview screen. A screen opens.
The [HW charging times] timer enables you to
configure 3 different time windows and temperatures
for the hot water tank for each day of the week.
Within a time window, the hot water is charged to
the set temperature. Outside a time window, the
hot water is charged to the set temperature [Set-back
temperature between time slots:].
The [Switch-on diff.] is also taken into consideration for the set temperature [Set-back
temperature between time slots:].
To set the charging times, tap the [HW charging times]
timer in the
overview. A screen opens.
Fig. 8-11: Overview of circulation times
Set the circulation times to be as short as
possible to ensure good buffer stratification and
prevent limescale build-up.
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Fig. 8-10: Overview of hot water charging times
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Setting circulation times for the circulation pump
With the [Circulation times] timer, you can set 3
different time windows for the circulation times of the
circulation pump for each day of the week.
46
www.eta.co.at
Operation
8.4.4
[Hot water tank] function block
Text menu
8.4.4.22
HW bottom off
Adjustable parameters
Explanation of [HW bottom off]
In function block [HW], switch to the text menu with the
button.
Optional: Only with additional [Hot water tank bottom]
temperature sensor
This parameter defines when charging of the hot water
tank will end.
Hot water tank
Switch-on diff.
HW bottom offa
Solar heat diss.b
As soon as the additional [Hot water tank bottom]
temperature sensor in the hot water tank reaches the
adjustable [HW bottom off] temperature, charging of
the hot water tank ends.
This parameter is factory-set to 10°C.
Priorityc
Modifying parameters
Circulation
d
The parameter can be found under:
Circulation runtime
Circulation pause
a. Only visible with additional temperature sensor
Hot water tank
HW bottom off
b. Only visible for buffers with solar heating system
c. Only visible for solar heating systems with switchover
between several tanks
Select the parameter and press the [Change] button. A
settings window will open.
d. Only visible with additional circulation pump
Enter the value and press the [Accept] button to save.
Detailed descriptions of the parameters are provided
below.
8.4.4.23
8.4.4.21
Switch-on diff.
Explanation of [Switch-on diff.]
This parameter regulates how far the current [Hot
water tank] temperature can fall before the hot water
tank again demands heat from the buffer or boiler.
This parameter is factory-set to 15°C. The current
[Hot water tank] temperature may therefore fall
15°C below the value [Hot water tank target] set in the
time slot. The hot water tank only demands heat from
the buffer or boiler when this happens.
Modifying parameters
The parameter can be found under:
Hot water tank
Switch-on diff.
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
Solar heat diss.
Explanation of [Solar heat diss.]
Optional: Only for buffers with solar heating system
This parameter defines whether the hot water tank
may take excess solar heat from the buffer.
If this parameter is set to [Yes], the hot water tank takes
the solar excess up to the maximum 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 [Buffer] function
block.
Modifying parameters
The parameter can be found under:
Hot water tank
Solar heat diss.
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
47
[Hot water tank] function block
8.4.4.24
Priority
Explanation of [Priority]
Optional: Only for solar heating systems with
switchover between several tanks
This parameter sets the priority for solar charging of
the hot water tank. A high priority means that this tank
will be charged by the solar heating system first. A low
priority means that it will be charged last.
The priority for the hot water tank is factory-set to
[High].
Modifying parameters
The parameter can be found under:
Operation
This parameter sets the period (pause) after a
circulation pump operating phase. The control system
can only restart the circulation pump after this time has
elapsed. This pause is only valid inside the set time
slot.
Modifying parameters
The parameter can be found under:
Circulation
Circulation pause
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
Hot water tank
Priority
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
8.4.4.25
Circulation runtime
Explanation of [Circulation runtime]
Optional: Only with circulation pump
This parameter sets the duration for operation of the
circulation pump after it has been started. This period
is only valid inside the set time slot.
After the set period has expired, the circulation
pump is switched off for the configurable duration
of the [Circulation pause] parameter.
Modifying parameters
The parameter can be found under:
Circulation
Circulation runtime
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.4.4.26
Circulation pause
Explanation of [Circulation pause]
Optional: Only with circulation pump
48
www.eta.co.at
Operation
[Hot water tank] function block
49
[Fresh water module] 2 pumps function block
Operation
8.5
[Fresh water module] 2 pumps
function block
8.5.1
Overview
Overview of the fresh water module (2 pumps)
You can return to the overview by pressing
[FWM].
and
water is maintained at the lowest configured
temperature of the 3 time slots, provided that the buffer
is sufficiently hot.
If a circulation pump is installed for the hot water,
it will be put into operation as "self-learning" by
default. This means that the hot water taps of the last
2 weeks are stored. The operating times of the current
day will be calculated from this and the circulation
pump is started accordingly.
If this function is turned off, in the overview the timer
[Circulation times] appears for manual setting of the
operating times.
After commissioning, no more data is available
for the "self-learning" circulation. That is why an
operating period of about 4 weeks is required in the
beginning, so that the control system can save
sufficient data.
Heat exchanger
The tap symbol next to the heat
exchanger is only displayed if the fresh
water module is feeding hot water into the
water mains. The temperature shown
next to this is the temperature of the hot
water currently being supplied.
If no hot water is being supplied, the heat exchanger is
shown blue all the way through.
1
Operating condition
2
Temperature [Buffer top]
3
Temperature [Primary return]
4
Display of hot water uptake
5
Temperature [Hot water]
6
Timer [Stand-by times]
This only appears if the hot water temperature is
not set via the potentiometer (option [Target value
can be set with rotary knob] is deactivated).
7
Timer [Circulation times]
This only appears if a circulation pump is installed
and the [Self-learning] function is deactivated.
Function of the fresh water module
The desired hot water temperature is set with the potentiometer on the fresh water module. If during the
configuration option [Target value can be set with
rotary knob] is deactivated, the [Stand-by times] timer
appears in the overview. With this you can set different
time windows and hot water temperatures for every
day of the week.
Inside these time windows, the upper part of the buffer
is maintained at no lower than the configured hot water
temperature. Outside the set time windows, the hot
50
Circulation pump in operation
Optional: for [Circulation pump]
The pump symbol next to the heat
exchanger appears when the circulation
pump for hot water is in operation.
Timer [Stand-by times]
This is only displayed if option [Target value can
be set with rotary knob] is deactivated
This timer displays the set charging times of the
current day for charging the hot water tank. These time
windows are displayed as a black bar in the timer.
Timer [Circulation times]
This only appears if a circulation pump is installed
and the [Self-learning] function is deactivated.
This timer displays the set times of the current day to
operate the circulation pump. These time windows are
displayed as a black bar in the timer.
www.eta.co.at
Operation
8.5.2
[Fresh water module] 2 pumps function block
Operating modes
Ready
No hot water is currently being taken.
Working
Hot water is currently being supplied.
8.5.3
Operation
Setting charging times and temperatures of the
fresh water module
With the [Stand-by times] timer, you can set different
time windows and hot water temperatures for the fresh
water module for each day of the week.
Primary return too warm
Within these time windows, the upper part of the
accumulator tank is maintained at no less than
the set hot water temperature.
Outside the set time windows, the hot water is
maintained at the lowest set temperature of the 3 time
windows, provided that the accumulator tank is sufficiently hot.
Hot water is being supplied, but the configured hot
water temperature is being reduced because the
[Primary return] temperature in the heat exchanger of
the fresh water module is too high.
To set the charging times and temperatures, tap the
overview
screen
on
the
[Stand-by
times]
timer. A screen
opens.
Buffer cold
Hot water is being supplied, but the buffer is not hot
enough to reach the configured hot water temperature.
Malfunction
There is a fault in a temperature sensor of the fresh
water module.
Circulation
The circulation pump is in operation.
Venting
The controller has found air in the fresh water module
and automatic venting is in operation. For this, both
pumps are operated at full speed for a short period of
time to remove the air from the fresh water module.
This can also take place multiple times sequentially.
Emergency operation
The fresh water module is in emergency mode
because the admixing pump is defective. Currently, hot
water is being delivered but it is only being produced
with the buffer pump.
Without the admixing pump, calcification
protection of the heat exchangers it not
guaranteed. Protracted emergency mode can
therefore calcify the heat exchanger.
Fig. 8-12: Overview of hot water charging times
Set the hot water temperature as low as possible
to prevent limescale build-up.
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Setting circulation times for the circulation pump
With the [Circulation times] timer, you can set 3
different time windows for the circulation times of the
circulation pump for each day of the week.
Ready (Emergency operation)
The fresh water module is in emergency mode
because the admixing pump is defective.
Without the admixing pump, calcification
protection of the heat exchangers it not
guaranteed. Protracted emergency mode can
therefore calcify the heat exchanger.
51
[Fresh water module] 2 pumps function block
To set the circulation times, tap the [Circulation times]
timer in the
overview screen. A screen opens.
Operation
8.5.4
Text menu
Adjustable parameters
In function block [FWM], switch to the text menu with
the
button.
Hot water
Automatic venting
Emergency operation only with buffer
pump
Circulation
Self-learning
Circulation runtime
Circulation pause
Fig. 8-13: Overview of circulation times
Set the circulation times to be as short as
possible to ensure good buffer stratification and
prevent limescale build-up.
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Detailed descriptions of the parameters are provided
below.
8.5.4.27
Function Automatic venting
Explanation of [Automatic venting]
This function attempts to remove introduced air from
the fresh water module automatically.
If the function is activated and the controller detects air
intake, both pumps are operated at full speed for a
short period of time to remove the air from the fresh
water module. This can also take place multiple times
sequentially.
This function is activated by default. During
venting, the hot water can briefly be hotter than
the target temperature set.
Modifying parameters
The parameter can be found under:
Hot water
Automatic venting
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
52
www.eta.co.at
Operation
8.5.4.28
[Fresh water module] 2 pumps function block
Function Emergency operation only
with buffer pump
Make your selection and press the [Accept] button to
save.
Explanation of the [Emergency operation only with
buffer pump] function
8.5.4.30
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.
Explanation of [Circulation runtime]
This function is set to [No] by default.
Modifying parameters
The [Service] access level is required to perform
modifications.
Circulation runtime
Optional: Only with circulation pump
This parameter sets the duration for operation of the
circulation pump after it has been started. This period
is only valid inside the set time slot.
After the set period has expired, the circulation
pump is switched off for the configurable duration
of the [Circulation pause] parameter.
Modifying parameters
The parameter can be found under:
The parameter can be found under:
Circulation
Circulation runtime
Hot water
Emergency operation only with buffer
pump
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
Select the parameter and press the [Change] button. A
settings window will open.
8.5.4.31
Make your selection and press the [Accept] button to
save.
Explanation of [Circulation pause]
8.5.4.29
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.
Function Self-learning
Explanation of the [Self-learning] function
With this function, the operating times of the circulation
pump of the last 2 weeks are saved. The operating
times of the current day are calculated based on this
and the circulation pump will be put into operation accordingly.
This function is set to [Yes] at the factory. If [No]
is set, the timer appears for manual setting of the
operating times in the overview.
Modifying parameters
The parameter can be found under:
Circulation pause
Optional: Only with circulation pump
Modifying parameters
The parameter can be found under:
Circulation
Circulation pause
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
Circulation
Self-learning
Select the parameter and press the [Change] button. A
settings window will open.
53
[Heating circuit] function block
8.6
[Heating circuit] function block
8.6.1
Overview
Heating circuit overview screen
Press the
button and [HC] to open the heating
circuit overview screen. Each heating circuit can be
adjusted in its own function block.
Operation
Press the [Day]
, [Auto]
or [Night]
buttons to
swap between the different modes. The selected
button then lights up green.
The slider adjusts the flow temperature of the heating
circuit, and therefore the room temperature.
[Day] mode
Inside a time slot set with the [Heat times] timer, the
heating circuit is in [Day] mode.
If a room sensor is installed, in this mode the
heating circuit is set to the highest room
temperature configured in the timer for the current day.
If there is no room sensor, the heating circuit runs
using the [Day] heating curve.
[Night] mode
Outside a time slot set with the [Heat times] timer, the
heating circuit is in [Night] mode.
If a room sensor is installed, in this mode the
heating circuit is set to the reduced room
temperature [Set-back temperature between time
slots:] configured in the timer for the current day.
If there is no room sensor, the heating circuit runs
using the [Night] heating curve.
[On/Off] button
1
Operating mode
2
Current room temperature (only with the [Analogue
RmSensor] or [Digital room sensor] option)
3
Slider
4
[away] button
5
[Auto] button
6
[home] button
7
[Day] button
8
[On/Off] button
9
[Night] button
This button switches the heating circuit on and
off. If the heating circuit is in operation, this
button appears green
.
Automatic mode [Auto]
This button switches the heating circuit to
automatic mode [Auto]. Here, the time slot
configured in the [Heat times] timer is used to
automatically toggle between the [Day] (inside a time
slot) and [Night] (outside a time slot) modes.
The symbol in the button changes depending on
whether the heating circuit is currently inside or
outside the configured time slot.
10 [Holiday] button
11 [Heat times] timer
= inside a time slot
12 Outside temperature
13 [Flow] temperature
= outside a time slot
How the heating circuit works
Press [On/Off]
to switch the selected heating circuit
on or off. If the heating circuit is on, this button lights up
green
.
With
times]
timer, you can set
3 different time slots for each day of the week (see
page 59). These time slots are displayed as a black
bar in the timer.
54
the
[Heat
[Day] continuous operation
This button causes the heating circuit to run
continuously in [Day] mode, and the time slots
set in the [Heat times] timer are ignored.
www.eta.co.at
Operation
[Heating circuit] function block
[Night] continuous operation
This button causes the heating circuit to run
continuously in [Night] mode, and the time slots
set in the [Heat times] timer are ignored.
Pressing [home] outside a time slot immediately
switches the heating circuit to [Day] mode.
Current room temperature
Optional: Only with [Analogue RmSensor] or [Digital
room sensor].
The installed room sensor displays the
current, measured room temperature.
Fig. 8-14: Outside a time slot
Pressing [home] inside a time slot causes the next
reduced temperature mode to be skipped.
[Flow] temperature
The symbol only appears when the heating
circuit is switched on.
The current [Flow] temperature for the heating circuit is
displayed.
Slider
Fig. 8-15: Inside a time slot
The slider adjusts the desired room
temperature in the range +/- 5°C. You can
increase or reduce the room temperature in
increments of 0.5°C using the
and
buttons.
If a room sensor is installed, when you press
the
and
buttons the target room
temperature is displayed instead of the scale.
[away] mode
This function is only available in [Auto] mode.
This button switches the heating circuit to
[Night] mode until the next configured time slot,
ignoring the current set time slot.
Pressing [away] inside a time slot immediately
switches the heating circuit to [Night] mode until the
next time slot begins.
[Heat times] timer
This timer displays the configured time slot for the
[Day] mode of the current day of the week. These time
slots are displayed as a black bar in the timer.
Fig. 8-16: Inside a time slot
[Holiday] mode
This button defines a period of time for
switching the selected heating circuit to [Night]
mode. The heating circuit is then switched to
the lowest temperature configured in the [Heat times]
timer.
Pressing [away] outside a time slot causes the next
configured time slot to be skipped.
[home] mode
This function is only available in [Auto] mode.
This button switches the heating circuit to [Day]
mode until the next configured time slot,
ignoring the current set time slot.
Fig. 8-17: Outside a time slot
55
[Heating circuit] function block
8.6.2
Operating modes
Day on
The heating circuit is inside a time slot configured with
the [Heat times] timer.
Night on
The heating circuit is outside a time slot configured
with the [Heat times] timer.
Holiday on
Operation
If no room sensor is installed, the heating circuit is
switched off because the calculated [HeatCurve]
temperature is below the required [Off if HeatCurve
below] temperature.
Room day off
The heating circuit is within a time slot, but switched
off. The current room temperature is higher than the
room temperature configured in the [Heat times] timer.
Room night off
The heating circuit is inside a holiday period configured
with the [Holiday]
button. This mode continues until
the end of the configured holiday period.
The heating circuit is outside a configured time slot,
and switched off. The current room temperature is
higher than the room temperature configured in the
[Heat times] timer.
Enable off
H-day room off
The heating circuit is switched off because the [Boiler]
temperature or [Buffer top] is below the required
[Enable temperature] temperature.
The heating circuit is inside a period configured with
the [Holiday]
button, but switched off. For the
current room temperature is higher than the [Set-back
temperature between time slots:] temperature
configured in the [Heat times] timer.
Day tgt. off
The heating circuit is switched off because the
[HeatCurve] temperature calculated on the basis of the
[Day] heating curve is either below the room
temperature measured by the room sensor, or below
the [Off if HeatCurve below] temperature.
If no room sensor is installed, the heating circuit is
switched off because the calculated [HeatCurve]
temperature is below the required [Off if HeatCurve
below] temperature.
Night tgt. off
The heating circuit is switched off because the
[HeatCurve] temperature calculated on the basis of the
[Night] heating curve is either below the room
temperature measured by the room sensor, or below
the [Off if HeatCurve below] temperature.
If no room sensor is installed, the heating circuit is
switched off because the calculated [HeatCurve]
temperature is below the required [Off if HeatCurve
below] temperature.
H-day tgt. off
The heating circuit is inside a period configured with
the [Holiday]
button. The heating circuit is switched
off because the [HeatCurve] temperature calculated
on the basis of the [Night] heating curve is either below
the room temperature measured by the room sensor,
or below the [Off if HeatCurve below] temperature.
56
Day heat. lim. off
The heating circuit is switched off because the current
outside temperature is higher than the configured [Day
heat. lim.] temperature.
Night heat. lim. off
The heating circuit is switched off because the current
outside temperature is higher than the configured [Setback heat limit] temperature.
H-day heat. lim. off
The heating circuit is inside a period configured with
the [Holiday]
button, but switched off. For the
current outside temperature is higher than the [Setback temperature between time slots:] temperature
configured in the [Heat times] timer.
Summer off
The heating circuit is switched off with the [On/Off]
button. The only active functions are frost protection,
and the pumps' anti-blocking protection, which runs at
midday every Saturday.
HW off
The heating circuit is switched off for hot water
charging.
www.eta.co.at
Operation
[Heating circuit] function block
RoomFreezeProt on
8.6.3
The heating circuit is in operation because the current
room temperature is below the [RoomFreezeProtLimit]
temperature.
Description of the heating curve
FlowFreezeProt on
The heating circuit is in operation because the current
[Flow] temperature is below the [Flow freeze prot. limit]
temperature.
ResidHeat on
The heating circuit does not supply any heat and the
pump only continues running briefly, to discharge heat
from the boiler.
HeatDiss on
The heating circuit is in operation because the boiler is
running at overtemperature. The heating circuit is
running at maximum temperature [Flow max].
The heating curve
The heating curve regulates the flow temperature for
the heating circuit. Each heating circuit has its own
heating curve, as underfloor heating requires different
settings from radiators.
The heating curve is defined by the two configurable parameters [Flow at -10°C] and [Flow at
+10°C]. The result is a line: the [Day] heating curve.
Based on the heating curve, the control system
calculates the currently required flow temperature for
the heating circuit in [Day] mode, depending on the
current outside temperature. For example, an outside
temperature of +3°C would result in a flow temperature
of 45°C (see diagram below).
If a room sensor is installed for the heating circuit,
the flow temperature calculated on the basis of
the heating curve is corrected. The actual flow
temperature will then differ from the calculated value.
Screed on
The heating circuit is in operation because the screed
drying program is running.
Sensor error on
The heating circuit is in operation, even though the
flow temperature sensor has a malfunction. It is
running at a lower flow temperature to ensure frost
protection.
Solar heat diss.
Excess heat is being taken from a buffer that is being
charged by a solar heating system.
Locked off
The heating circuit was switched off by an external
signal (= "locked").
Fig. 8-18: [Day] heating curve
1
Flow temperature scale
2
Configurable parameter [Flow at -10°C]
3
[Day] heating curve
4
Configurable parameter [Flow at +10°C]
5
Outside temperature scale
The heating curve for [Night] mode is determined by a
parallel shift of the [Day] heating curve. This shift is set
via the [Set-back] parameter (see page 60).
57
[Heating circuit] function block
Operation
The flow temperature for [Night] mode is determined
on the basis of the outside temperature and the [Night]
heating curve.
If the heating circuit is always too hot or too cold in
[Day] mode in the transitional period (in spring or
autumn), only reduce or increase the [Flow at +10°C]
parameter.
Fig. 8-19: [Night] heating curve
Fig. 8-20: Adjusting the heating curve in the transitional
period
1
[Flow max]
2
[Day] heating curve
1
3
[Night] heating curve
4
[Day heat. lim.]
5
[Set-back heat limit]
If the heating circuit is always too hot or too cold in
[Day] mode in the winter, only reduce or increase the
[Flow at -10°C] parameter.
[Flow at +10°C]
If the current outside temperature exceeds the
configured [Day heat. lim.] temperature in [Day]
mode, the heating circuit is shut off. The same applies
to [Night] mode, if the outside temperature exceeds the
[Set-back heat limit] temperature. To set these
parameters, see page 61.
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.
Adjusting the heating curve
If the heating circuit is always too hot or too cold in
[Day] mode, you must adjust the heating curve. Do this
by adjusting parameters [Flow at -10°C] and [Flow at
+10°C].
Only ever make minor adjustments to these
parameters: never more than 2°C for underfloor
heating, and 4°C for radiators. You may need to 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.
58
Fig. 8-21: Adjusting the heating curve in the winter
1
[Flow at -10°C]
www.eta.co.at
Operation
[Heating circuit] function block
You can change the parameters [Flow at -10°C] and
[Flow at +10°C] in the text menu of the heating circuit
in question, see page 60.
8.6.4
Operation
If the heating circuit is always too hot or too cold
in [Night] mode, you only have to adjust the [Setback] parameter, see page 60.
With the [Heat times] timer, you can set 3 different time
windows for the heating circuit for each day of the
week.
Setting heating times and room temperatures
Within a time window, the heating circuit is in
[Day] mode. Outside a time window, it is in [Night]
mode.
If a room sensor is installed, the room
temperature can be adjusted within a time
window. Likewise, the reduced room temperature [Setback temperature between time slots:] can be adjusted
outside the time window for each day of the week.
To
set
heating
times,
tap
the [Heat times]
timer in the overview
screen. A screen opens.
Fig. 8-22: Overview of heating times if a room sensor is
installed
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
Holiday setting function
When you press the [Holiday]
button, you can
define a period during which the selected heating
circuit is switched to [Night] mode. The heating circuit
is then set to the lowest temperature [Set-back
temperature between time slots:] configured in the
[Heat times] timer.
To set this function, tap the [Holiday]
overview screen.
button in the
59
[Heating circuit] function block
A settings screen opens:
Operation
8.6.5
Text menu
Adjustable parameters
Select the respective heating circuit [HC], [HC2]... and
press the
button to switch to the text menu.
Heating circuit
HeatCurve
Flow at -10°C
Flow at +10°C
Set-back
Day heat. lim.
Fig. 8-23: Setting the start of the holiday
Set-back heat limit
Enter the date and time for the start of the holiday.
Press the
button to enter the end of the holiday.
Finally, press [Accept] to save your entries. The
heating circuits overview screen appears.
Solar heat diss.
Detailed descriptions of the parameters are provided
below.
8.6.5.32
Flow at -10°C and Flow at +10°C
Explanation of [Flow at -10°C] and [Flow at +10°C]
The two adjustable parameters [Flow at -10°C] and
[Flow at +10°C] are used to define the [Day] heating
curve.
Based on the current outside temperature , the control
system uses the heating curve to calculate the
currently required flow temperature for the heating
circuit in [Day] mode.
Modifying parameters
The parameters can be found under:
Heating circuit
HeatCurve
Flow at -10°C
Flow at +10°C
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.6.5.33
Set-back
Explanation of [Set-back]
This parameter is used to set the parallel shift of the
[Day] heating curve, in order to determine the [Night]
heating curve.
60
www.eta.co.at
Operation
[Heating circuit] function block
This parameter is factory-set to 3°C for underfloor
heating and 15°C for radiators.
Only make minor changes to this parameter, because
when walls cool down too much, dramatically higher
air temperatures are required to heat the room. Any
energy savings will then be lost.
The following figures are a guide, depending on the
configured temperature [Flow at -10°C] and the design
of the heating circuit:
Temperature
Radiators
Flow at -10°C
40°C
Set-back
60°C
80°C
5 - 8°C 10-15°C 15-22°C
Temperature
Underfloor heating
Flow at -10°C
30°C
40°C
Set-back
3°C
5°C
Modifying parameters
Enter the value and press the [Accept] button to save.
8.6.5.35
Solar heat diss.
Explanation of [Solar heat diss.]
This parameter defines whether the selected heating
circuit may use excess solar heat from the buffer.
If this parameter is set to [Yes], this heating circuit
takes on the solar excess. The heating circuit switches
itself on and a heating curve is calculated as if for an
outside temperature of 0°C.
This parameter is factory-set to [No].
You must check the conditions for the [Extra solar
heat] function in the text menu of the [Buffer] function
block.
Modifying parameters
The parameter can be found under:
The parameter can be found under:
Heating circuit
Heating circuit
HeatCurve
Set-back
Select the parameter and press the [Change] button. A
settings window will open.
Solar heat diss.
Select the parameter and press the [Change] button. A
settings window will open.
Make your selection and press the [Accept] button to
save.
Enter the value and press the [Accept] button to save.
8.6.5.34
Day heat. lim. and Set-back heat limit
Explanation of [Day heat. lim.] and [Set-back heat
limit]
The [Day heat. lim.] and [Set-back heat limit]
parameters are used to set outside temperatures at
which the selected heating circuit is shut off in [Day] or
[Night] mode.
The [Day heat. lim.] parameter is factory-set to
18°C and the [Set-back heat limit] parameter to
2°C.
Modifying parameters
The parameters can be found under:
Heating circuit
Day heat. lim.
Set-back heat limit
Select the parameter and press the [Change] button. A
settings window will open.
61
[Solar] function block
8.7
[Solar] function block
8.7.1
Overview
Operation
Solar] for a buffer, [Hot water tank bottom] for a hot
water tank and [Current consumer temp.] for a solar
tank.
Versions of solar heating system
Press the
button and [Solar] to open the solar
heating system overview screen.
The ETAtouch control system is compatible with
a great many versions, for enabling the
integration of a solar heating system. The various
versions are described below.
Solar heating system in operation
This symbol appears while the solar
heating system is in operation and
is supplying heat. The displayed
temperature is the [Collector] temperature.
If the solar panel is displayed on its own without the
lines, the solar heating system is switched off.
Priority of the tank or section
The number of stars indicates the configured
priority of the tank or section.
3 stars indicate the highest priority. This tank or section
is charged by the solar heating system first. One star
denotes the lowest priority, so this tank or section is
charged last.
If no stars are displayed, this tank or section is already
sufficiently charged.
You can set the priority for each tank or section in
the text menu of the relevant function block. So,
for the buffer, use the buffer text menu.
Solar heating system with one tank
Only one tank is shown in the overview screen,
regardless of whether the solar heating system is
charging the buffer, the hot water tank or a solar tank
(e.g., pool).
The temperature displayed in the tank is [Buffer bottom
Fig. 8-24: Solar heating system with one tank
1
Operating condition
2
Current output of the solar heating system (only if
a heat flow meter is installed)
3
Temperature [Collector]
4
Outside temperature
5
Temperature of tank [Tank 1 bottom]
Control system:
The solar heating system is controlled by switching the
collector pump on and off. This is switched on as soon
as the collector has exceeded the minimum
temperature [Collector min] and is warmer by the
difference [Switch-on diff.] (factory setting 7 °C) than
the tank being charged.
The speed of the collector pump is controlled in such a
way that the collector supplies a temperature that is
higher than the current tank temperature by the configurable offset [Target collector diff.].
When the tank has reached its maximum temperature,
or if the collector is only warmer by the offset [Switchoff diff.] (factory setting 5 °C) than the tank, the
collector pump is switched off.
The maximum temperature is factory-set to 90 °C
for the buffer [Buffer bottom max] and 60 °C for
the hot water tank [Hot water tank max.].
62
www.eta.co.at
Operation
Solar heating system with several tanks
If the solar heating system is charging more than one
tank - buffer and hot water tank, for example - these
are shown in the overview screen. The lines always
lead to the tank that is currently being charged.
[Solar] function block
[Collector min] and is warmer by the difference
[Switch-on diff.] (factory setting 7°C) than the
temperature of the tank with the highest priority.
The sequence for switching from one tank to
another is based on the configured priorities. The
tank with the highest priority is charged first.
If the solar power is not sufficient for charging the tank
with the highest priority (= collector is only warmer by
the difference [Switch-off diff.] (factory setting 5 °C)
than the tank currently requiring charging), the tank
with the next highest priority is charged after the
minimum time has elapsed (factory setting
20 minutes).
If the solar power increases once more, after the
minimum time has elapsed solar charging switches
back to the tank with the higher priority. This ensures
that the tank with the highest priority is always charged
first.
Fig. 8-25: Solar heating system with 2 tanks
1
Priority and temperature of the first tank
2
Priority and temperature of the second tank
Uniform charging of tanks without consideration
of individual priorities is also possible.
However, the [Service] permission is required for this.
Then you can use the [Changeover if diff. >] parameter
in the solar heating system text menu to configure the
temperature difference between the tanks.
Fig. 8-26: Solar heating system with 3 tanks
1
Priority and temperature of the first tank
2
Priority and temperature of the second tank
3
Priority and temperature of the third tank (here, the
[Sol. tank] function block)
Switching between tanks:
The collector pump is switched on as soon as the
collector has exceeded the minimum temperature
63
[Solar] function block
Solar heating system for buffer with 2 coils
In the overview screen, the temperatures and
configured priorities of the top and bottom sections are
displayed.
The collector lines lead to the top or bottom section of
the buffer, depending on which section is currently
being charged.
Operation
top section is charged.
If the solar heating system is supplying too little heat,
the collector pump is switched off. It is restarted when
the collector has exceeded the minimum temperature
[Collector min] and is warmer by the difference
[Switch-on diff.] (factory setting 7 °C) than [Buffer top
Solar].
Once the top section has been charged up to the target
temperature [Buffer target solar], solar charging takes
place in the bottom section.
If the [Tank 1 top] temperature falls below the target
temperature [Buffer target solar], the top section is
charged once more.
The [Buffer top min. solar] parameter is used to
set a minimum temperature for the top section of
the buffer, see page 39.
This way, solar charging only takes place in the top
section once the collector is warmer by the difference
[Switch-on diff.] (factory setting 7 °C) than [Buffer top
min. solar]. Up until this time, the bottom section of the
buffer is charged.
If one of the above conditions is not satisfied, stratified
charging does not take place in the top section, and
only the bottom section of the buffer is charged.
Fig. 8-27: Buffer with 2 coils
1
Temperature [Tank 1 top] and priority of top section
2
Temperature [Tank 1 bottom] and priority of bottom
section
The [Tank 1 top] temperature corresponds to
[Buffer top Solar] and temperature [Tank 1
bottom] corresponds to [Buffer bottom Solar].
Stratified charging via the solar heating system:
The purpose of stratified charging is to produce a sufficiently high temperature in the top part of the buffer,
so that the boiler does not have to start up to provide
hot water treatment.
A dedicated target temperature [Buffer target solar] is
available for controlling stratified charging. You can
find this in the buffer text menu under [Buffer] -> [Buffer
top Solar] -> [Buffer target solar].
It is based on the current demand of the consumer or
the minimum temperature [Buffer top min. solar].
Stratified charging takes place when the following
three conditions are met:
• The boiler is not in operation
• The outside temperature is above 10 °C (factory
setting [Min. out. temp. Solar prio.], see page 39)
• Temperature [Tank 1 top] is lower than [Buffer
target solar]
The top section has the highest priority by default and
is therefore charged first. As long as the [Tank 1 top]
temperature is lower than [Buffer target solar], only the
64
www.eta.co.at
Operation
Solar heating system with external heat exchanger
[Solar] function block
Solar heating system with external heat exchanger
and stratified charging valve
The lines of the heat exchanger always lead to the
section of the buffer that is currently being charged.
The set priorities are displayed at the section which is
currently charged.
Fig. 8-28: Solar heating system with external heat exchanger
1
Current output of the solar heating system (only if
a heat flow meter is installed)
2
Temperature of tank [Tank 1 bottom]
3
Temperature: [Secondary flow]
4
Temperature: [Solar flow] (only if a heat flow meter
is installed)
1
Temperature [Tank 1 top]
5
Temperature: [Solar return]
2
Temperature [Tank 1 bottom] and priority of bottom
section
3
[Secondary flow]
4
[Solar return]
Control system:
The collector pump is switched on as soon as the
collector has exceeded the minimum temperature
[Collector min] and is warmer by the difference
[Switch-on diff.] (factory setting 7 °C) than the tank
being charged.
The speed of the collector pump is controlled in such a
way that the collector supplies a temperature that is
higher than the current tank temperature by the configurable offset [Target collector diff.].
If the collector pump is in operation, the
secondary pump starts up. This pump tries to
adjust the temperature difference between collector
and secondary flow (of the heat exchanger) to the
temperature difference between the return of the solar
heating system and the tank. This is achieved by
changing the speed of the secondary pump.
When the tank has reached its maximum temperature,
or if the collector is only warmer by the offset [Switchoff diff.] (factory setting 5 °C) than the tank, the
collector pump is switched off.
Fig. 8-29: External heat exchanger with stratified charging
valve
The [Tank 1 top] temperature corresponds to
[Buffer top Solar] and temperature [Tank 1
bottom] corresponds to [Buffer bottom Solar].
Stratified charging via the solar heating system:
The purpose of stratified charging is to produce a sufficiently high temperature in the top part of the buffer,
so that the boiler does not have to start up to provide
hot water treatment.
A dedicated target temperature [Buffer target solar] is
available for controlling stratified charging. You can
find this in the buffer text menu under [Buffer] -> [Buffer
top Solar] -> [Buffer target solar]. It is based on the
current demand of consumers and the minimum
temperature [Buffer top min. solar].
Stratified charging takes place when the following
three conditions are met:
• The boiler is not in operation
• The outside temperature is above 10 °C (factory
setting [Min. out. temp. Solar prio.], see page 39)
• Temperature [Tank 1 top] is lower than [Buffer
target solar]
65
[Solar] function block
The top section has the highest priority by default and
is therefore charged first. As long as the [Tank 1 top]
temperature is lower than [Buffer target solar], only the
top section is charged.
If the solar heating system is supplying too little heat,
the collector pump is switched off. It is restarted when
the collector has exceeded the minimum temperature
[Collector min] and is warmer by the difference
[Switch-on diff.] (factory setting 7 °C) than [Buffer top
Solar].
Operation
Solar heating system with two solar panels
Both solar panels are always shown in the overview
screen. If the second solar panel is also supplying
heat, the lines to the tank are displayed for this panel.
Once the top section has been charged to the ta
rget temperature [Buffer
target
solar], solar charging takes place in the bottom sectio
n.
After this, stratified charging is controlled based on the
[Secondary flow] temperature. If this is at least 2 °C
warmer than [Tank 1 top], the top section of the buffer
is charged. If the [Secondary flow] temperature is
colder than [Tank 1 top], the bottom section of the
buffer is charged.
If the [Tank 1 top] temperature falls below the target
temperature [Buffer target solar], the top section is
charged once more.
The [Buffer top min. solar] parameter is used to
set a minimum temperature for the top section of
the buffer, see page 39.
This way, solar charging only takes place in the top
section once the collector is warmer by the difference
[Switch-on diff.] (factory setting 7 °C) than [Buffer top
min. solar]. Up until this time, the bottom section of the
buffer is charged.
66
Fig. 8-30: Solar heating system with two solar panels
1
Solar panel 1
2
Solar panel 2
www.eta.co.at
Operation
8.7.2
[Solar] function block
Operating modes
Solar panel temp. too low
The solar heating system is switched off because the
solar panel is colder than the temperature in the tank.
With a buffer, the [Buffer bottom Solar] temperature is
compared. With a hot water tank, it is the [Hot water
tank bottom] temperature.
Tank charged
The solar heating system is switched off because the
connected tanks are completely charged. The buffer
has reached the [Buffer bottom max] temperature
(factory setting 90°C), or the hot water tank has
reached the [Hot water tank max.] temperature (factory
setting 60°C).
8.7.3
Text menu
8.7.3.36
Collector min
Explanation [Collector min]
This parameter sets the minimum temperature for
starting the solar panel pump. The solar panel pump
can only be started once the solar panel has exceeded
this temperature.
Do not set this temperature too high, to ensure
that heat can already be supplied to pre-heat the
tank even when there is little sunlight. The ideal range
is between 30-50°C. This parameter is factory-set to
30°C.
Modifying parameters
The parameter can be found under:
Solar panel temp. too high
The solar heating system is switched off because the
solar panel has exceeded the configured maximum
temperature [Collector max] (factory setting 120°C).
State
Collector
Collector min
Working
The solar heating system is in operation.
Delay
The solar heating system is switched off, but the
secondary pump still continues running briefly.
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.7.3.37
Target collector diff.
Emer. op.
Explanation [Target collector diff.]
There is a fault in the [Secondary flow] or [Solar
return] temperature sensor. The solar heating system
remains in operation, but is controlled only by the
temperature of the solar panel.
This parameter sets the desired temperature
difference between the solar panel and the connected
tank (buffer or hot water tank). This temperature
difference is controlled by adjusting the speed of the
solar panel pump.
Malfunction
This parameter is factory-set to 10°C.
There is a fault in the solar panel temperature sensor.
The solar heating system is therefore switched off.
If the buffer is being charged by the solar heating
system, the temperature of the solar panel
[Collector] is compared with the buffer temperature
[Buffer bottom Solar]. If the hot water tank is being
charged, the [Hot water tank bottom] temperature is
compared.
A high temperature difference results in a low
speed of the solar panel pump. This way, a
smaller quantity of water is conveyed through the solar
panel. The water remains in the solar panel for a longer
time, and therefore produces a higher working
temperature in the panel. Consequently, a higher hot
water temperature is achieved, but there are also more
losses from the solar panel.
67
[Solar] function block
Operation
A low temperature difference results in a higher
speed of the solar panel 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.
Modifying parameters
The parameter can be found under:
State
Collector pump
Target collector diff.
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
68
www.eta.co.at
Operation
[Solar] function block
69
[Aux.boiler] function block
8.8
[Aux.boiler] function block
8.8.1
Overview
Auxiliary boiler overview
Press
and [Aux.boiler] to open the auxiliary boiler
overview window.
1
Operating mode
2
Auxiliary boiler
3
[AuxBoilerTemp] temperature
4
Diverter valve (only with [Diverter valve] option)
5
[MEAS.] button
6
[On/Off] button
7
[Stand-by times] timer
Various tasks of the auxiliary boiler
An additional auxiliary boiler 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).
The auxiliary boiler is only activated by the control
system if the ETA heating boiler is unable to meet
the required output. For heating systems with a
buffer, the aux. boiler is put into operation as soon
as the ETA heating boiler has not reached the
required temperature [Buffer target]. For heating
systems without a buffer, if the ETA heating boiler
has not reached the required temperature [Boiler
tgt.].
70
Operation
The icon for the auxiliary boiler pump is displayed
in the overview as soon as it's in operation. This is
started by the ETA control system if the aux. boiler
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.
A changeover valve is displayed in the overview
screen with a red and blue line. The red line
indicates the heat producer that is currently
supplying heat to the consumers. The blue line
indicates the heat producer that is disabled.
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.
Auxiliary boiler functionality
Use the [On/Off]
button to enable or disable the
auxiliary boiler for the ETA control system. If the
auxiliary boiler is enabled (button lit up green
), the
ETA control system can activate it when needed, but
only within the configured times of operation.
After a demand for the auxiliary boiler by the ETA
control system, the start of the auxiliary boiler can be
delayed with the adjustable [Start lag] parameter; see
page 72.
The [Stand-by times] timer is used to set the charging
times for the auxiliary boiler; see page 72.
The [MEAS.]
button switches the auxiliary boiler to
emission measuring mode.
[MEAS.] button
This button operates the auxiliary boiler for a
period of 30 minutes for the emission measurement. When the 30 minutes are over, the
auxiliary boiler automatically switches back to normal
operation.
www.eta.co.at
Operation
[Aux.boiler] function block
[On/Off] button
This button enables and disables the auxiliary
boiler. If the auxiliary boiler is enabled, this
button appears green
.
Measurement
The auxiliary boiler is in emission measuring mode for
the duration of 30 minutes.
Malfunction
Timer [Stand-by times]
There is a fault in a temperature sensor.
Wait delay
This timer shows the configured time slots for auxiliary
boiler stand-by for the current day of the week. These
time windows are displayed as a black bar in the timer.
Auxiliary boiler
A delay was set for operation of the auxiliary boiler.
The auxiliary boiler waits for the configured duration of
the delay ([Start lag] parameter). If there is still a
demand by the ETA control system after this period
ends, then the auxiliary boiler will begin operation.
Locked
The flame in the auxiliary boiler is displayed when it is
enabled in the ETA control system.
The ETA control system has disabled the auxiliary
boiler so that it cannot be in operation simultaneously
with the boiler.
Timer off
Changeover valve
Optional: only for [Diverter valve]
The red line indicates which heat
producer (auxiliary boiler or ETA boiler)
is currently supplying heat to the
consumers. The blue line indicates the heat producer
that is disabled and is not currently supplying any heat.
The current time is outside the configured stand-by
times.
Overtemperature
The auxiliary boiler's temperature has exceeded the
configured [AuxBoilerMax] temperature and the
auxiliary boiler will therefore be switched off.
Auxiliary boiler charging pump
Optional: only for [Aux.boiler charging pump]
This symbol is displayed when the
auxiliary boiler charging pump is in
operation.
8.8.2
Operating modes
Off
The auxiliary boiler has been disabled with the
button (switched off), so it cannot be put into operation
by the ETA control system.
Ready
The auxiliary boiler is enabled and within the
configured stand-by times.
On
The auxiliary boiler is in operation and is supplying
heat to the heating system.
71
[Aux.boiler] function block
8.8.3
Operation
Operation
8.8.4
Text menu
Setting auxiliary boiler stand-by times
8.8.4.38
Start lag
The [Stand-by times] timer can be used to set 3
different time windows for auxiliary boiler stand-by for
each day of the week.
Explanation of [Start lag]
To set the stand-by times, tap the [Stand-by times]
timer in the
overview window. A screen opens.
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.
Modifying parameters
The parameter can be found under:
Aux.boiler
Settings
Start lag
Select the parameter and press the [Change] button. A
settings window will open.
Fig. 8-31: Overview of stand-by times
Enter the value and press the [Accept] button to save.
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
72
www.eta.co.at
Operation
[Aux.boiler] function block
73
[External heat demand] function block
8.9
[External heat demand] function
block
8.9.1
Overview
External heat demand overview
Operation
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).
Timer [Stand-by times]
Press the
button and [ExtDem] to open the external
heat demand overview.
With this function block, an external control system can
demand heat from the ETA heating system.
This timer shows the configured time slots for external
heat consumer stand-by for the current day of the
week. These time windows are displayed as a black
bar in the timer.
External heat consumer
This symbol represents the external
heat consumer. If the top section is
shown in red, the consumer is
currently being supplied with heat.
If the consumer is entirely blue, no heat is being
supplied to it.
Switch
This symbol indicates whether the heat consumer
is currently demanding heat from the heating
system.
1
Operating mode
2
Switch
3
External heat consumer
4
[Stand-by times] timer
5
Outside temperature
6
Temperature of ETA heating system
If the switch is open there is currently no demand by
the heat consumer. If the switch is closed
the
external consumer is demanding heat from the heating
system.
External charging pump
This symbol appears when the external
heat consumer's charging pump is in
operation. The displayed temperature is
the buffer's [Buffer top] temperature.
External heat demand function
8.9.2
With the [Stand-by times] timer, for each day of the
week different time slots and the temperature needed
by the external heat consumer can be configured.
Off
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 temperature [Enable temperature];
see page 76.
74
Operating modes
There is no demand from the external heat consumer.
Demand
The external heat consumer is demanding heat from
the heating system.
Delay
The external heat consumer is switched off and the
pump is running for the configured duration [Delay
time].
www.eta.co.at
Operation
Heat dissipation
The external heat consumer is being charged to
dissipate the excess heat from the boiler.
FreezeProt
The current outside temperature is lower than the
configured [FreezeProt] temperature of the external
heat consumer.
To protect the consumer, the external charging pump
is switched on. It will remain in operation until the
outside temperature is at least 2 °C higher than the
[FreezeProt] temperature setting.
[External heat demand] function block
8.9.3
Operation
Set charging times and temperatures for the
external heat consumer
With the [Stand-by times] timer, you can set different
time windows and temperatures for the external heat
consumer for each day of the week.
Within these time windows, the heat consumer
can demand heat from the heating system.
To set the charging times, tap the [Stand-by times]
timer in the
overview. A screen opens.
The factory setting for the freeze protection
threshold is +5 °C outside temperature to protect
consumers at risk from freezing (such as air heat exchangers).
If there is no freezing risk for the connected
consumers, the freeze protection limit can be set
lower.
Timer off
There is a demand by the external heat consumer, but
the current time is outside the time slot configured in
the timer so the external heat consumer will not be
charged.
Working
The external heat consumer is being supplied with
heat by the heating system.
Fig. 8-32: Overview of stand-by times
You can find further details about setting the time
window in chapter 8.1.5 "Setting a time window".
75
[External heat demand] function block
8.9.4
Text menu
8.9.4.39
Enable temperature
Operation
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.
Modifying parameters
The parameter can be found under:
External demand
Enable temperature
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
8.9.4.40
FreezeProt
Explanation of [FreezeProt]
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 [FreezeProt] 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 heat exchangers).
If there is no freezing risk for the connected
consumers, the freeze protection limit can be set
lower.
Modifying parameters
The [Service] access level is required to perform
modifications.
The parameter can be found under:
External demand
FreezeProt
Select the parameter and press the [Change] button. A
settings window will open.
Enter the value and press the [Accept] button to save.
76
www.eta.co.at
Operation
[External heat demand] function block
77
[Heating pipeline] function block
8.10
[Heating pipeline] function block
8.10.1
Overview
Overview of heating pipeline
Press the
button and [Pipel] to open the heating
pipeline overview.
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.
With this function block, a heating substation can
also be used for withdrawing heat in a district
heating network; see page 78.
1
Operating mode
2
Heating pipeline mixing valve (only with [Pipeline
mixing valve] option)
3
Current flow temperature (only with the [Pipeline
mixing valve] option)
4
Heating pipeline pump
5
Heating pipeline consumers
How the heating pipeline works
The heat is supplied to the connected consumers
(buffer, heating circuits, hot water tank, etc.) via the
heating pipeline with the heating pipeline pump.
When the heating pipeline is in operation, the
upper line (=flow) is shown in red and the symbol
for the heating pipeline is displayed.
If the heating pipeline is not in operation, both lines are
shown in blue.
If a mixing valve is installed in the heating
pipeline, it is shown in the overview with the
currently measured flow temperature. With the heating
pipeline mixing valve, only the required temperature is
78
Operation
supplied to the consumers, making the heating
pipeline's heat loss considerably lower and improving
the stratification in the buffer.
Overview of heating substation
With the [Transfer station] option this function block is
used to control a heating substation in a district heating
network.
A heating substation is defined as a plate heat
exchanger with a primary valve.
This function block is then the heat producer for the
connected consumers such as heating circuits,
buffers, hot water tanks, etc.
When head is supplied to consumers from the
heating substation, the upper line (=flow) is
shown in red. The symbol for the heating pipeline
pump and the current flow temperature are displayed.
If the heating substation is not in operation, both lines
are shown in blue.
1
Heating substation's heat exchanger
2
Current flow temperature [Curr. temp.]
3
Heating pipeline pump
4
Heating substation's consumer
5
[On/Off] button to switch heating substation on/off
Heating pipeline mixing valve
Optional: only for [Pipeline mixing valve]
When the heating pipeline is in operation,
the upper line is shown in red and the
currently measured flow temperature is
displayed. When it is not in operation, only
the mixing valve symbol is displayed and both lines are
shown in blue.
www.eta.co.at
Operation
[Heating pipeline] function block
Heating pipeline pump
This symbol appears when the external
heating pipeline pump is in operation.
Heating pipeline consumers
This symbol represents the
pipeline's connected consumers.
heating
8.10.2Operating modes
Off
There is no demand from the consumers.
On
Heat is being supplied to the connected consumers.
FreezeProt
The current outside temperature is lower than the
configured temperature [FreezeProt] of the heating
pipeline.
To protect the consumers, the transmission pump is
switched on. It will remain in operation until the outside
temperature is at least 2 °C higher than the [FreezeProt] temperature setting.
The factory setting for the frost protection limit is
-20 °C.
Heat dissipation
The heating pipeline pump is started in order to
dissipate the boiler's excess heat by charging the
heating pipeline's consumers.
Malfunction
There is a fault in a temperature sensor.
79
[Special conveyor] function block
8.11
[Special conveyor] function block
8.11.1
Overview
Special conveyor overview
Press the
button and [SpConv] to open the special
conveyor overview.
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)
Operation
barrier is interrupted and displayed in red in the
overview. If the light barrier is displayed in green, there
is no fuel or insufficient fuel in the drop chute.
Intermediate conveyor screw overview
When several conveyor screws in series are used to
transport fuel to the boiler, they are referred to as intermediate conveyor screws.
Every individual intermediate conveyor screw is shown
in its own function block [SpConv1], [SpConv2]...
Up to 1.1 kW of drive power are controlled by the
conveyors in this function block. This covers all
ETA conveyors.
Conveyors with a higher drive power are controlled in
the [Ext. conveyor] ([ExtConv]) function block.
If several conveyors are installed (as in a double
agitator), each is shown in its own function block
([SpConv] and [SpConv2]).
Fig. 8-34: Intermediate conveyor screw overview
1
Intermediate conveyor screw
2
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.
1
Operating mode
2
Agitator
A light barrier is also supplied with the intermediate conveyor screw ex-works for controlling the
fuel transport.
If the drop chute is filled with enough fuel, the light
barrier is interrupted and displayed in red in the
overview. If the light barrier is displayed in green, there
is no fuel or insufficient fuel in the drop chute.
3
Light barrier (only with [Light barrier in drop chute]
option)
Double agitator overview
Fig. 8-33: Special conveyor overview
The agitator and the screw are shown in green as soon
as they begin to transport fuel. They are displayed in
grey when not in operation or when the screw is turning
in reverse in order to remove a blockage.
To control the fuel conveying system, a light
barrier is supplied ex-works for the drop chute.
If the drop chute is filled with enough fuel, the light
80
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
[SpConv] and [SpConv2].
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.
www.eta.co.at
Operation
[Special conveyor] function block
Use the [On/Off]
button in the overview to switch off
an agitator (button then shines red). Then the other
agitator takes over the fuel transport.
8.11.2
Operating modes
Self-check
The conveyor drive is performing a self-check.
Ready
The conveyor is not in operation, and there is no
demand for fuel.
Full
There is sufficient fuel in the drop chute. The light
barrier is interrupted.
Convey
The conveyor is in operation and is conveying fuel.
Self-check malf.
A malfunction has occurred during the self-check.
Fig. 8-35: Double agitator overview
1
Agitator
Conveyor malf.
2
Light barrier (only with [Light barrier in drop chute]
option)
The conveyor drive has a malfunction.
3
[On/Off] button for switching off this agitator
Drop chute open
The agitator and the screw are shown in green as soon
as they begin to transport fuel. They are displayed in
grey when not in operation or when the screw is turning
in reverse in order to remove a blockage.
The sensor on the drop chute has been triggered,
maybe due to overfilling.
A light barrier for the drop chute is supplied exworks for controlling the fuel conveying system.
If the drop chute is filled with enough fuel, the light
barrier is interrupted and displayed in red in the
overview. If the light barrier is displayed in green, there
is no fuel or insufficient fuel in the drop chute.
The safety chain, e.g. water shortage alert, emergency
stop, safety temperature limiter, rotary valve
maintenance cover, etc. has been broken. Heating is
blocked and cannot be resumed.
Safety device interrupted
81
[Special conveyor] function block
8.11.3
Operation
Text menu
8.11.3.41 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.
The factory setting is 5 hours.
Modifying parameters
You can find this parameter in function block
[Boiler].
The parameter can be found under:
Boiler
Intermediate conveyor screw
Double agitator
Switch. time
Select the parameter and press the [Change] button. A
settings window will open.
Enter the duration and press [Accept] to save.
82
www.eta.co.at
Operation
[Special conveyor] function block
83
[External conveyor] function block
8.12
[External conveyor] function
block
8.12.1
Overview
Operation
If the drop chute is filled with enough fuel, the light
barrier is interrupted and displayed in red in the
overview. If the light barrier is displayed in green, there
is no fuel or insufficient fuel in the drop chute.
Intermediate conveyor screw overview
External conveyor overview
Press the
button and [ExtConv] to open the
external conveyor overview.
This function block is used with wood chip boilers
to control existing fuel conveyor systems. For
example:
• Silo conveyor system
• Double agitator (two agitators supply one boiler)
• Intermediate conveyor screw (several conveyor
screws in series)
When several conveyor screws in series are used to
transport fuel to the boiler, they are referred to as intermediate conveyor screws.
Every individual intermediate conveyor screw is shown
in its own function block [ExtConv1], [ExtConv2]...
Conveyors with a drive power greater than
1.1 kW are controlled in this function block.
Conveyors with a drive power up to 1.1 kW are
controlled in the [Special conveyor] ([SpConv])
function block.
If several conveyors are installed (as in a double
agitator), each is shown in its own function block
([ExtConv] and [ExtConv2]).
Fig. 8-37: Intermediate conveyor screw overview
1
Intermediate conveyor screw
2
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.
Fig. 8-36: External conveyor overview
1
Operating mode
2
Agitator
3
Light barrier (only with [Light barrier in drop chute]
option)
The agitator and the screw are shown in green as soon
as they begin to transport fuel. They are displayed in
grey when not in operation or when the screw is turning
in reverse in order to remove a blockage.
For controlling the fuel conveying system, an
optional light barrier is available. If it has been
installed, it is shown in the drop chute.
84
An optional light barrier is also supplied with the
intermediate conveyor screw for controlling the
fuel transport. If it has been installed, it is shown in the
drop chute.
If the drop chute is filled with enough fuel, the light
barrier is interrupted and displayed in red in the
overview. If the light barrier is displayed in green, there
is no fuel or insufficient fuel in the drop chute.
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
[ExtConv] and [ExtConv2].
www.eta.co.at
Operation
[External conveyor] function block
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.
Use the [On/Off]
button in the overview to switch off
an agitator (button then shines red). Then the other
agitator takes over the fuel transport.
8.12.2
Operating modes
Ready
The conveyor is not in operation, and there is no
demand for fuel.
Full
There is sufficient fuel in the drop chute. The light
barrier is interrupted.
Convey
The conveyor is in operation and is conveying fuel.
Conveyor malf.
The conveyor drive has a malfunction.
Fig. 8-38: Double agitator overview
1
Agitator
2
Light barrier (only with [Light barrier in drop chute]
option)
3
[On/Off] button for switching off this agitator
The agitator and the screw are shown in green as soon
as they begin to transport fuel. They are displayed in
grey when not in operation or when the screw is turning
in reverse in order to remove a blockage.
For controlling the fuel conveying system, an
optional light barrier is available. If it has been
installed, it is shown in the drop chute.
If the drop chute is filled with enough fuel, the light
barrier is interrupted and displayed in red in the
overview. If the light barrier is displayed in green, there
is no fuel or insufficient fuel in the drop chute.
85
[External conveyor] function block
8.12.3
Operation
Text menu
8.12.3.42 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.
The factory setting is 5 hours.
Modifying parameters
You can find this parameter in function block
[Boiler].
The parameter can be found under:
Boiler
Intermediate conveyor screw
Double agitator
Switch. time
Select the parameter and press the [Change] button. A
settings window will open.
Enter the duration and press [Accept] to save.
86
www.eta.co.at
Operation
[External conveyor] function block
87
[Agitator] function block
8.13
8.13.1
[Agitator] function block
Overview
Agitator overview
Press the
overview.
button and [Agitator] to open the agitator
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.
The agitator is shown in the overview. It is shown in
green as soon as it is in operation. Otherwise it shown
in grey.
Operation
Agitator functionality
Press the [On/Off]
button to enable or switch off the
agitator. If the agitator is enabled (button shines green
) 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.
[On/Off] button
This button enables and disables the agitator. If
the agitator is enabled, this button appears
green
.
[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 be emptied.
If the button has been pressed, it will shine
green. Press the button again to enable the agitator
again.
8.13.2
Operating modes
Self-check
The conveyor drive is performing a self-check.
Off
The agitator has been disabled with the
button, so
it cannot be put into operation by the ETA boiler.
Ready
The agitator is not in operation and there is no demand
for fuel.
Rotate
Fig. 8-39: Agitator overview
The agitator is in operation and is conveying fuel.
1
Operating mode
2
Agitator
3
Light barrier (only with [Light barrier for fill level
measure top] option)
4
Light barrier (only with [Light barrier for fill level
measure bottom] option)
Safety device interrupted
5
[EMPTY] button (only with [Light barrier for fill level
measure top] or [Light barrier for fill level measure
bottom] options)
6
[On/Off] button to enable or disable the agitator
The safety chain, e.g. water shortage alert, emergency
stop, safety temperature limiter, rotary valve
maintenance cover, etc. has been broken. Heating is
blocked and cannot be resumed.
Wait for self-check
The self-check of the drive could not be performed
because the safety chain was interrupted.
Self-check error
The agitator drive's self-check has failed.
88
www.eta.co.at
Operation
[Agitator] function block
Stirrer error
The agitator's drive has a fault.
89
Filling the storage room
9
Filling the storage room
Before filling the fuel store
Start filling in the centre
Before filling, the conveyor and boiler must be fully
assembled and connected.
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.
Perform a visual inspection
Before filling the fuel store, perform a visual
inspection of the conveyor to identify any damage
or foreign objects.
Never drive over the floor agitator
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 or possibly
even 6 m.
Floor agitator must be turning while filling
The maximum fill height of the fuel depends on the
fuel, or its weight:
• Pellets up to 2.0 m
• Wood chips up to 5.0 m
The floor agitator must be turning while the fuel store
is being filled. When the fuel store is empty, the floor
agitator's spring arms are extended. If the spring arms
are covered with fuel in this position, they will be
trapped and the floor agitator will no longer be able to
turn.
The rotation of the floor agitator starts by pressing
the button [MEAS.]
in the boiler overview
window. A settings window appears. In this, set the
[Start now] parameter to [Yes] This switches the boiler
to emission measurement mode and transports the
fuel to the boiler.
After filling, switch the boiler back to normal mode. To
do this, open the settings window with the [MEAS.]
button and press the [Measurementdeactivate] button.
If you do not press this button, the boiler will automatically switch back to normal mode after some time.
90
www.eta.co.at
Rectifying problems
10 Rectifying problems
Malfunctions in fuel transport
Ash screw jammed
The drives for transport of the fuel are monitored
by the control system. If the discharge screw or
the stoker screw is blocked, the control system tries to
unblock the screw by reversing it.
If the blockage persists after 3 attempts to remove it,
an error message is displayed. The boiler starts an
ember burnout and then switches to [Malfunction]
mode. As long as the blockage persists, the boiler can
no longer be switched on.
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.
In the case of an error message with "current
draw too high", a single large piece of wood or a
foreign body is often blocking the discharge screw.
An error message with "overload" or "motor protection"
indicates wood chips that are too fine or too long are
interfering with the discharge screw. That overloads
the drive, which is switched off by the motor protection.
If the ash box is not full, then it can be assumed that a
foreign object is blocking the ash screw.
In this case, stop heating by pressing the [On/Off]
button in the boiler overview window. Only perform the
further steps after the [Switched off] status is
displayed.
Detach the ash box from the boiler and check the
visible part of the ash screw. The foreign object may
already be found at the end of the ash screw, where it
can be removed.
Before eliminating the blockage, switch off the boiler
with the mains switch. The maintenance covers can be
opened when eliminating the blockage.
Fig. 10-2: Ash screw
If no foreign object is visible, it is probably in the
combustion chamber under the tilting grate.
The grate cannot be tilted by hand. Tipping is
done by starting de-ashing with the [ASH]
button. The grate tilts and remains in this position for
approximately 15 seconds.
WARNING!
Danger of crushing due to tilting grate
Fig. 10-1: 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
 When the grate is tilted, switch off the boiler with
the mains switch. This causes the grate to remain
in this position so injuries are prevented.
Lift the combustion chamber cover and lean it against
the combustion chamber wall.
After removing the blockage, replace the covers and
switch the boiler back on with the mains switch.
91
Rectifying problems
Now the ash screw under the grate is accessible and
the foreign object can be removed.
The ash screw is now loosened from its shaft and can
be extracted from the ash duct by turning it anticlockwise.
Fig. 10-4: Unscrewing the ash screw
After removing the foreign object, replace the
combustion chamber cover and reattach the ash box
to the boiler.
For a final check, switch the boiler back on with the
mains switch and press [ASH]
to perform deashing.
Remove the ash or the foreign object from the ash
duct.
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 check, start de-ashing by pressing [ASH]
Removing the ash screw
If the ash screw is jammed or the foreign object
cannot be removed, the ash screw must be
removed.
Stop heating by pressing [On/Off]
in the boiler
overview window. As soon as the [Switched off] status
is displayed, switch off the boiler with the mains switch.
Detach the ash box from the boiler and remove the
M8 screw that secures the ash screw.
Fig. 10-3: Removing the screw
92
www.eta.co.at
.
Information on fuel
Suitable fuels
11 Information on fuel
11.1
Suitable fuels
The amount of ash depends on the fuel
Ash is the non-flammable residue from the wood. It
consists of minerals such as calcium and potassium
without which life cannot exist, but also soil, sand and
stones, i.e. impurities in the fuel.
Wood chip, with its very low bark content, has an ash
content of approximately 0.5 %. The bark itself has an
ash content of nearly 4 %. In practice, there is always
soil and sand stuck to the bark.
Fuel from crops has a very high potassium content.
The ash content is in the range 3 to 6%.
Wood residues with a high proportion of fine branches
and needles is extremely dense in storage, is poorly
ventilated and does not dry. Frequently, this material
already begins to rot at the timber storage site. With
this process of decomposition, the heating value
diminishes and the ash content rises.
How often ash waste containers have to be emptied
depends on the heat capacity of the boiler and the
quality of the fuel (ash content, heating value, etc..).
The preferred fuel is coarse wood chips with a low
fine content
The length of the individual wood chips should be
between 30 and 50 mm, to ensure that air can circulate
well among the stored chips, water can escape from
the pile and the tendency to rot and turn mouldy is
minimal.
If the fine content (sawdust, bark, needles, soil, sand)
is too high, it can obstruct the airways. Water
evaporates inside the warm wood chip pile. If the
vapour cannot escape, it will condense in the upper
part of the heap. Some of the wood chips will then rot
and turn to compost with no heating value.
Avoid green, moist wood chips
Only wood chips that are sufficiently dry (water content
below 25%) can be stored in a concrete bunker without
problems. Moist, coarsely chopped chips stored in an
open hall exposed to the wind quickly reach a water
content under 35%.
Be especially careful with waste wood
When waste wood is on offer, it may be rotten with no
heating value; only buy waste wood by weight and with
limited water content (25% maximum). Also ensure
that the wood contains no contaminants. The
applicable laws only allow the use of untreated wood
without foreign substances for heating purposes.
Wood-processing facilities may burn chipboard if
it contains no halogens or wood preservatives.
Binding agents containing chlorine used to frequently
be used in wood products. if these are burned in a
boiler without appropriate cleaning of the flue gas, contaminants detrimental to health will be emitted. Apart
from this, a very high chlorine content will have a
severe negative effect on the life of the boiler.
Only burn wood products or painted, coated or
varnished wood if you are sure these contain no wood
preservatives, organohalogen compounds or heavy
metals.
Nails and stones
Nails and stones will hardly bring the boiler to a halt,
but they cause increased wear on the screws and the
blades in the rotary valve.
Impurities in the fuel
Impurities in the fuel result in a higher ash content and
are frequently responsible for a lower ash melting
point. If the ash melting point is exceeded, the ash
fuses (slag formation). It is therefore in the plant
operator's interests to keep impurities to a minimum.
Types of wood chips
The best quality wood chips are finely chopped
hardwood, without bark, with low dust content and a
water content below 20%. With the highest heating
value and the lowest storage volume requirement, this
would be the optimum fuel for any boiler.
Fine wood chips can be made from dry wood, enabling
a higher storage density.
Even if wood is stored dry, the energy content wanes,
and the heating value of dry wood decreases by 10%
over 10 years.
Wood chips from dry branches and shrubbery cuttings
have higher bark content and usually also large
amounts of dirt and decayed material. Resulting in
more
ash.
If they were chopped from dry wood, there will be no
storage problems and the reduction in boiler output is
low.
Forestchopped wood chips from fresh branches are not fit f
or storage and reduce the achievable boiler output si
gnificantly.
93
Moist fuel
Information on fuel
Wood that has been stored in damp conditions for a l
ong time (10
years) has lost up to 50%
of its heating value.
Chips from such wood significantly reduce the achiev
able boiler output.
The final product from wet wood is compost, which ca
n be disposed of in a refuse incinerator but can hardly
be burned in a normal boiler.
Ensure good ventilation during storage.
The higher the water content of the wood, the more c
oarsely it should be chopped.
Never store more than a year's supply of wood chips
(round logs can be stored more easily and densely).
Be very careful where wood chips from waste wood a
re on offer at especially low prices; the fraction of dec
ayed material and perhaps also the amount of foreign
objects (nails, wood preservatives, sand, stones) can
be very high.
11.2
Moist fuel
Decay and mould
Up to a water content of approx. 25%, the water is
bound up in the wood fibres. Above 25%, water is
found between the fibre cells in cavities and capillary
vessels. This unbound water is a habitat for, and also
a basis for the reproduction of, microbes and fungi,
which can penetrate the tree through wounds in the
wood structure, particularly cuts or breaks. These
microbes convert cellulose and lignin into the basic
building blocks carbon dioxide and water. The wood
rots, hollows out and becomes brittle, ultimately losing
all of its heating value.
When a tree is felled, the race between drying and
decay begins. As the water content decreases, the
living conditions for microbes worsen until they die off
when the water content drops below 25%. The faster
the drying process, the more heating value remains in
the wood.
For thin branches, the microbes have a very large
contact surface in relation to the wood volume. No
matter how neatly the branches are stacked, losses in
heating value over 25% are the rule (and considerably
more in wet weather). This is why forestry businesses
don't even take part in this race when branches are
smaller than 3 to 5 cm; instead, the material is left
behind as nutrient material for the forest.
Easy recognition of moist or dry wood
Even through professionals who work daily with wood
chips only trust the oven test for measurements of the
exact water content, there is still a very simple way to
distinguish moist from dry. Chips that feel dry in the
94
hand have a water content below 25% and can be
stored without problems. If they feel wet, the water
content is sure to be above 35%.
If the wood chips are dark brown, light and already
crumbly, then you are holding rotten wood in your
hands, wood that has already lost the majority of its
heating value. From such "compost" you can expect
only problems, but not boiler output.
Do not store moist wood chips without ventilation
Wood chips can only be stored without ventilation (for
example in a concrete cellar) if their water content is no
more than 30%.
If moist wood chips from a sawmill are to be used
anyway, then no more than three weeks' supply should
ever be kept in an unventilated bunker. An air inlet and
an outlet fan can remove water vapour and at least
limit mould growth.
Store moist wood chips in an open hall
During the decay process, moist wood chips release
heat that drives out water. Wet areas form on the
surface, and rising water vapour may also be visible. If
the wind is given the chance to transport the water
away, coarse wood chips will dry while decay and fungi
will stay within acceptable limits.
Best is a flying roof separate from living and working
quarters, which keeps rain out but lets the wind work
unhindered. At least one side of the storage hall should
be completely open. Additional openings in all other
walls improve the storage conditions.
11.3
Drying and chopping wood chips
Coarse wood chips with minimal fine content dry
fastest
Coarse chips (chopped with sharp blades!!!) dry faster
with less loss of material due to the improved air circulation. Fill heights between 4 and 6 m have proven
effective. This height is also safe as regards selfignition, which only becomes a danger at heights of 8
m or more.
Even when coarsely chopped, very moist and green
material (leaves and needles) and bark have a high
fine content (typical and unavoidable features of
shrubbery cuttings and delimbing material) and higher
biological activity, and allow only minimal air circulation. In spite of higher self-heating, the low air
circulation slows the drying process and material loss
is considerably higher.
www.eta.co.at
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.
Water content
11.4
Water content
Using an oven to determine water content
A kilogram of wood chips is spread out on a baking
sheet and dried in an oven for 6 to 12 hours at 101 to
104°C. To be certain of a temperature over 100°C in a
typical electric oven in spite of the inexact thermostat,
you can set it to 110°C, but no higher as the wood will
begin outgassing even at slightly higher temperatures.
Fine and very moist pieces will need to be turned a few
times. The difference in weight between the moist test
material and the dry material corresponds to the water
content.
Longer interim storage of samples can falsify their
water content.
Take samples after transport
A pile of wood chips has 10 to 30% more water content
in the upper layers than in the middle. The material is
mixed by the loading and unloading process during
transport. By taking about a litre from 5 different places
at a depth of at least 20 cm (never from the surface) in
each load, you can get a good average with low error.
Taking the test quantity from the total sample
From several transport loads, you will get more than 1
kg of test material. To obtain a smaller quantity, mix the
material by rebuilding the pile, always emptying the
shovel over the top of the pile so that the material is
distributed over its entire surface. Then flatten the pile
and remove the two opposing quarters from it. Repeat
the mixing and removal process until you have two
batches of test material of 1 kg each, 1 kg for the buyer,
who usually determines the water content in the oven,
and 1 kg for the seller as a control sample. The volume
for one kilogram is around 3 litres for wet, heavy wood
chips and as much as 5 litres for very dry and light
material.
Water content and moisture
Water content has become the established
measurement for wood used for generating energy; in
the lumber business, the wood's moisture is usually
stated.
Water content (%) =
Moisture content (%)
=
water in the wood (kg) x 100
total weight of wood (kg)
water in the wood (kg) x 100
dry weight of the wood (kg)
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.
Water content (%) =
moisture (%) x 100
100% + moisture (%)
95
Judging the quality
11.5
Information on fuel
Judging the quality
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 A layer of chips from green branches with leaves or needles can cause a blockage in a pile of
needles
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 heating value
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 wit
h 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 i
n a cubic metre.
P16S
P31S
+0%
-16%
Kind of wood
Hardwood is denser and heavier and thus has a higher heat con Hornbeam, black loc +53%
tent per cubic metre.
ust
Beech
+44%
Oak, ash
+40%
Birch, maple
+25%
Pine, larch
+19%
Spruce, alder
Fir, willow
Poplar
Bark content
Small branches
The lighter in colour the wood chips are, the lower their bark con without bark
tent.
10% bark
Wood chips from small branches or wood chips with bark from s
30% bark
awmills have a high bark content with high ash content and usu
ally also higher dirt content.
This results in more effort spent on cleaning.
Wood chips from small branches usually have a high degree of
decay.
Small branches
0%
-6%
-19%
+5%
0%
-10%
-25%
Judging quality when buying by the kilogram
Criterion
Comments
Effect on heating value
Water content
The lower the water content, the higher the heating value. The
water content is given as a percentage of the total weight.
Chip size
The chip size has no effect on the heating value per kilogram
96
20%
30%
35%
40%
www.eta.co.at
+12%
0%
-12%
-20%
Information on fuel
Judging the quality
Judging quality when buying by the kilogram
Criterion
Kind of wood
Comments
Heavy hardwood, when dried, has about 5%
less heating value than softwood, and about 6%
less when moist.
Effect on heating value
Softwood
0%
Hardwood
-5%
to
-7%
Light hardwood, when dried, has 6%
less heating value than softwood and 7% less when moist.
Bark content
The bark content has little influence on the heating value per kil
ogram, but a high bark content means a higher ash content and
more time spent on cleaning.
Small branches
Wood chips from small branches usually have a high degree of
decay.
Small branches
-25%
97
Other fuels
11.6
Information on fuel
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 chamber, so for size 35/50 a maximum heating
output of 35 kW can be reached, for size 70/90 a maximum of 63 kW, for size 130 a maximum
of 95 kW and for size 200 a maximum of 140 kW.
Old wood
Wood kept in dry storage loses only the volatile components (about 10% of the heating value).
Wood stored in moist storage decays (cold oxidation process) to the point of total loss of heating
value.
Wood shavings
The heating value per cubic metre varies widely and is around 30 to 60% less than that of wood
chips (with 30% water content) from the same wood. Since wood shavings are usually air-dried
(15% to 20% water content), they are best bought by weight. Wood chips from some types of
hardwood cause rapid wear on the combustion chamber's fire clay. With wood shavings, the full
rated output of the boiler cannot be reached.
Sawdust
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.
98
www.eta.co.at
Information on fuel
11.7
Heating value
Heating value
Heating values of fuels
Cubic metre (rm) a
Heating
Round logs
value based
on weight
Weight
Loose cubic metre (srm) b
Logs
Wood chips P16S
Heating
value
Weight
Heating
value
Wood chips P31S
Weight
Heating
value
Water
content
15%
30%
15%
30%
15%
30%
15%
30%
15%
30%
15%
30%
15%
Unit
kWh/ kWh/
kg
kg
kg/
rm
kg/
rm
kWh/ kWh/
rm
rm
kg/
srm
kg/
srm
kWh/ kWh/
srm srm
kg/
srm
kg/
srm
kWh/ kWh/
srm srm
1 rm =
0.65 fm c
Softwood
1 rm =
0.56 fm c
1 srm = 0.40 fm c
30%
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
1 rm =
0.59 fm c
Hardwood
930
1 rm =
0.50 fm c
1 srm = 0.40 fm c
1 rm = 0.33 fm c
Poplar
3.99
3.16
1020
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 dumped wood chips.
c. A solid cubic metre (fm) corresponds to 1 m³ wood without air gaps.
99
Low-emission operation
12 Low-emission operation
Notes on complying with limit values in Germany
after 1 January 2015
In accordance with the provisions of "BImSchV," lower
limit values for the emission measurement in Germany
apply to all new heating system installations starting
1 January 2015. In particular, compliance with the new
dust limit value of 20 mg/m³ can lead to problems in
practice.
It was determined under laboratory conditions in
testing centres that the ETA boiler complies with the
new limit values. To be fair, however, it should be noted
that high-quality fuels were used and the heating
system operated under optimal conditions. Things look
different in practice. Low-quality fuels are often used,
which represents a problem for the dust limit value.
Fuels used for testing
The following fuels were used as test fuel for emission
measurements and approval of the boiler:
• Conifer wood chips without bark according to
ISO 17225-4 with the designation "P31S M25 F05
A0.5"
• Pellets according to ISO 17225-2 with the
designation "D06 M10 A0.5"
The ash content of the fuel is an indicator for the
dust emission
According to the current state of science, dust
emissions from complete combustion are inorganic
components in the fuel, so-called aerosol formers.
Studies by renowned research institutes have clearly
demonstrated that the aerosol formers present in the
fuel (e.g., potassium, calcium, sulphur, chlorine,
sodium, zinc, silicon, phosphorous...) are released in
relatively fixed proportions. Accordingly, the level of
dust emissions is determined by the proportions of
these aerosol formers in the fuel.
The situation is made difficult by the fact that the
percentage of aerosol formers in the wood depends on
many factors (tree species, soil condition, season…).
Even different parts of the tree (trunk, branches, core/
sapwood) can demonstrate stark fluctuations.
In practice, the ash content of the fuel has proven to be
a good indicator of the percentage of aerosol formers.
In order to operate the system with the lowest possible
dust emissions, a properly maintained condition as
well as high-quality fuels with the lowest possible ash
content (barks, impurities, leaves, needles...) are indispensable.
100
Dear customer!
Your boiler is labelled with the "Blauen
Engel" to show that it is an environmentally friendly boiler. With this in mind,
please note the following for efficient
and low-emission operation of your
heating system:
1) The installation and adjustment of the heating
system must be performed only by qualified and
trained personnel.
2) Use only the fuels specified by us in the user
manual (in the warranty conditions). This is the
only way to ensure low-emission, economical and
problem-free operation of your heating system.
3) Perform the maintenance and cleaning procedures
recommended by us on your heating system at
regular intervals. In this way, you can ensure that
your heating system and its safety features will
work effectively to provide efficient and lowemission operation. You can get the best care for
your heating system by signing a service contract.
4) Your boiler is adjustable within an output range
between 30% and 100% of its rated output. To
avoid unnecessary emissions in low-output
operation, the systems should be operated as
much as possible in the mid to high-output range
(adjusted to the heating requirement). Please do
not use any heating controller that is separate from
the boiler control. Use the heating circuit control
integrated in the boiler control in combination with
a room sensor.
5) From an energy perspective, a buffer storage tank
and a combination with a solar heating system are
recommended. This ensures efficient and lowemission operation of your heating system.
The Clean Air Act 1993 and Smoke Control Areas
Under the Clean Air Act local authorities may declare
the whole or part of the district of the authority to be a
smoke control area. It is an offence to emit smoke from
a chimney of a building, from a furnace or from any
fixed boiler if located in a designated smoke control
area. It is also an offence to acquire an "unauthorised
fuel" for use within a smoke control area unless it is
used in an "exempt" appliance ("exempted" from the
controls which generally apply in the smoke control
area).
The Secretary of State for Environment, Food and
Rural Affairs has powers under the Act to authorise
smokeless fuels or exempt appliances for use in
smoke control areas in England. In Scotland and
Wales this power rests with Ministers in the devolved
www.eta.co.at
Low-emission operation
administrations for those countries. Separate legislation, the Clean Air (Northern Ireland) Order 1981,
applies in Northern Ireland. Therefore it is a
requirement that fuels burnt or obtained for use in
smoke control areas have been "authorised" in
Regulations and that appliances used to burn solid fuel
in those areas (other than "authorised" fuels) have
been exempted by an Order made and signed by the
Secretary of State or Minister in the devolved administrations.
The ETA 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
G20 to G50 with a maximum water content of 35% (per
ÖNORM M7133) or P16 to P45 with a maximum water
content of 35% (EN14961-4) and with an optionally
available flue gas recirculation, wood pellets according
to EN14961-2 class A1, EN plus class A1 or DINplus.
Further information on the requirements of the Clean
Air Act can be found here:
http://smokecontrol.defra.gov.uk/
Your local authority is responsible for implementing the
Clean Air Act 1993 including designation and
supervision of smoke control areas and you can
contact them for details of Clean Air Act requirements.
101
www.eta.co.at
www.eta.co.at
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement