eta T2-BT Quick guide

2019-11-18
EN
0000000227
V.007
X.47.0
939590-001
Control extensions
T2-BT and T2-BTI
Configuration

ETA Heiztechnik
Gewerbepark 1
A-4716 Hofkirchen an der Trattnach
Tel: [phone] / 22 88 -0
Fax: [phone] / 22 88 -22
[email protected]
www.eta.co.at

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Contents
1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Description of the configuration wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Checking outputs, changing terminal assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Changing the access level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Setting manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Modify terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Backing up and restoring a configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Configuration parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 [BufferFlex] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1.1 PufferFlex for automatic boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1.2 PufferFlex for log boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 [Hot water tank] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.3 [Heating circuit] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3.1 Basic settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3.2 Heating circuit with room sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.3.3 Screed drying. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.4 [Solar] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.5 Function block [pool] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6 [Aux.boiler] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7 Function block [changeover valve]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.8 [External heat source] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.9 [External heat demand] function block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.10 [Heating pipeline] function block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.11 Function block [meter] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

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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.
Software Description
The software version described in this documentation
corresponds to the version valid at the time of publica-
tion. The software version installed on your product
may differ from that described in this documentation.
A software update to a more recent version can
always be performed. With the appropriate au-
thorisation, the required files can be found at
"www.eta.co.at".
Subject to technical changes
We reserve the right to make technical modifications
without notice. Printing and typesetting errors or
changes of any kind made in the interim are not cause
for claims. Individual configurations depicted or
described here are only available optionally. In the
event of contradictions between individual documents
regarding delivery scope, the information in our current
price list applies.
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.

Description of the configuration wizard
5
2 Description of the configuration wizard
Configuration with the wizard
Configuration with the wizard takes place in several
steps. These are described below:
1) Add the function blocks required for the installed
heating system components. Choose your settings
and options individually in each function block.
2) When you have added all the necessary function
blocks, set the individual connections between
"producers" and "consumers".
"Producers" are components that provide heat or
fuel. "Consumers" consume this heat or fuel.
3) Next, the terminal assignments of each function
block is displayed on the corresponding circuit
board. In this step, the heating system
components are electrically connected. You may
also adjust the terminal assignments during this
step.
4) Finally, the configuration is installed, and the
software rebooted.
After this, you can make customer-specific
adjustments to the heating system, such as: buffer
charging times, room temperatures for the heating
circuit, hot water temperatures, etc.
When you have completed these customer adap-
tations, save this configuration. It is saved in the
ETAtouch control system. You can additionally save it
on a USB stick.
The description below explains the general way
in which the configuration wizard works. Your
heating system's individual configuration depends on
the installed components, and can vary.
Starting the configuration assistant
In the system configuration , increase the authori-
sation to [Service] and open the system configuration
menu with the [Systems configuration] button.
Fig. 2-1: System configuration menu
Start the configuration assistant with the [Starting
the assistant] button.
Function block overview
The [Possible function blocks] column shows the
function blocks available for selection, and the
[Selected function blocks] column shows the function
blocks that have already been added.
Fig. 2-2: Function block overview
1 Function blocks available for selection
2 Type and node number of circuit board
3 Add a function block
4 Function blocks already added
5 Next step of configuration
6 End configuration
7 Delete an added function block
8 Show the options of an added function block
Press the button to see the options and settings for
an added function block. With the button function
blocks that have already been added can be deleted.
Adding another function block is quick and uncompli-
cated. In this example, the [Heating circuit] function
block is used to explain the process. Select the
function block from the [Possible function blocks]
column, and then press the button.

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Description of the configuration wizard
A window opens showing the function block's settings.
Adjustments may be necessary, depending on the
installed heating system components.
Fig. 2-3: Function block settings
1 Possible selections
2 Display information
3 Show function block options
Press a row to select it. Press the button to see the
information. Press the [Options] button to view the
function block options.
Fig. 2-4: Function block options
1 Function block options
2 Show function block settings
3 Save options and settings
Select the required options, depending on your
installed heating system components, and save
with the [Accept] button.
The function block has been added and appears in the
overview screen in the [Selected function blocks]
column. Add further function blocks in the same way.
Continue the configuration by pressing the [Next]
button.
Connections overview screen
In this window, you can determine the individual
connections between producers and consumers.
Fig. 2-5: Connections overview screen
1 Overview of created connections
2 Possible producers
3 Possible consumers
4 Delete selected connection
5 Create a new connection
You can create a connection by pressing [New connec-
tion]. The choice of possible connections shown
depends on the previously selected function blocks,
options and settings:
• [Heating water]: For all connections between
producers and consumers that are connected via
the heating water.
• [SolarMedium]: For all solar heating system con-
nections.
• [Pellets]: For all pellet fuel system connections.
• [Woodchips]: For all wood chip fuel system con-
nections.
• [Ash]: For all de-ashing system connections.
• [SH-Twin]: For the connection between log boilers
and TWIN pellet burners.
• [Indv. room]: For all individual room control con-
nections.
Select the type of connection you require, then tap the
necessary producers and consumers to select them.
This connection then appears in the [Connections]
window.

Description of the configuration wizard
7
When you have set up all the necessary connections,
press [Next] to continue configuration.
Terminal allocation overview screen
The terminal allocations for the individual heating
system components are shown in this window.
Fig. 2-6: Terminal allocation overview screen
1 Overview of added function blocks
2 Terminal allocations of individual components of
the selected function block
All configured function blocks for the individual circuit
boards are listed in the [Selected function blocks]
window. When you select a function block, its assigned
terminal allocation is shown in the window below. In
this step, the individual components are connected to
the respective terminals on the circuit board.
Once all components have been connected, press the
[Next] button to continue configuration.
You can already change the terminal allocations
in this step. The next section explains how to
change the terminal allocation for the temperature
sensor of the hot water tank.
Changing terminal allocation
1. In the function block of the hot water tank, tap the
temperature sensor [Hot water tank] twice. A
window opens.
Fig. 2-7: Example: Changing terminal allocation
1 Current terminal allocation
2 Available terminals, the factory setting is
highlighted
3 Delete current terminal allocation
4 Allocate new terminal allocation
5 Close window
2. In the upper window, select the terminal and press
[Disconnect] to delete the current terminal
allocation.
3. After this, select a free terminal in the lower
window and allocate the new allocation by
pressing [Connect]. Finish by closing the window
with the [Close] button.
Installing a configuration
Finish by pressing [Apply] to install the configuration.
The configuration will then be adopted and the
software restarted.

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Changing the access level Checking outputs, changing terminal assignments
3 Checking outputs, changing terminal assignments
3.1 Changing the access level
Authorisation setting [Service]
The [Service] access level is required in order to adjust
certain parameters. To enable this, open the system
configuration and tap the [Authorisation]
symbol. A settings window appears. Enter the
password "135" and press [Accept the authorisation] to
confirm.
3.2 Setting manual mode
Switching on an output manually
The terminal assignment of the individual components
of the selected function block are displayed in the
inputs and outputs menu, e.g. pumps, temperature
sensors, and mixers. In this menu, these can be
activated manually (manual mode), for example, to
check their function.
In the example below, the heating circuit pump of the
heating circuit is started manually.
The heating circuit pump is started manually
1. Increase the authorisation to [Service]. See
Chapter 3.1 "Changing the access level".
2. Select the heating circuit and change the inputs
and outputs in the menu by tapping on the
symbol, followed by the symbol. An overview
opens.
Fig. 3-1: Overview
3. In the heating circuit pump, tap on the symbol.
A settings window appears. With the [On] button,
the pump is turned on manually, and turned off by
pressing the [Off] button.
Fig. 3-2: Settings window
4. If the pump is switched on manually, the [On]
button will light up yellow to confirm. In addition,
the name of the function block is displayed in red.
Fig. 3-3: Manual mode is activated
In manual mode, the [Automatic] button appears. It
is used to switch off manual mode, and automatic
mode is again started by the ETAtouch control
system. You can close this setting window with the
arrow on the left side, even if manual mode is still
active.
The ETAtouch control system automatically
reverts all manually switched on outputs back
to automatic mode after 30 minutes.
In the same manner, the running direction of a mixer is
checked. See the example below.

Checking outputs, changing terminal assignments Modify terminal assignment
9
Running direction of the heating circuit mixing
valve
1. With the [Service] authorization, open the inputs
and outputs menu in the heating circuit function
block. On the heating circuit mixing valve, tap the
symbol. The current status and position is
displayed.
2. The mixer can be opened and closed with the
[Open] and [Closed] buttons. Pressing the [Stop]
button keeps it in its current position.
3.3 Modify terminal assignment
Modify terminal assignment
The terminal assignment of the individual components
of the selected function block are displayed in the
inputs and outputs menu, e.g. pumps, temperature
sensors, and mixers. In this menu, the terminal
assignment can be changed.
In the example below, the terminal assignment of the
heating circuit pump is changed.
Modify terminal assignment of the heating circuit
pump
1. Increase the authorisation to [Service]. See
Chapter 3.1 "Changing the access level".
2. Select the heating circuit and change the inputs
and outputs in the menu by tapping on the
symbol, followed by the symbol. The overview
screen opens.
Fig. 3-4: Overview
3. In the heating circuit pump, tap on the symbol.
The current terminal assignment is shown in the
upper area at [Current terminal assignment].
Fig. 3-5: Terminal allocation overview screen
The current allocation is erased with the button.
Next, select a free terminal from the [Available
terminals] list, and assign it using the button.
The changed allocation is displayed in the upper
area at [Current terminal assignment].

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Modify terminal assignment Checking outputs, changing terminal assignments
The factory terminal allocation is shown in the
[Available terminals] list with a yellow font
colour.
Fig. 3-6: Factory setting (yellow font)

Backing up and restoring a configuration
11
4 Backing up and restoring a configuration
Backup configuration
After you have made adjustments to satisfy customer
requirements, you should save the configuration. This
backup saves the configuration, parameter settings,
input and output terminal allocations, etc. – in other
words, all relevant data and settings in the ETAtouch
control system. This makes it possible to quickly
restore the original settings.
Backup configuration
1. In the system configuration , increase the au-
thorisation to [Service] and open the system con-
figuration menu with the [Systems configuration]
button.
Fig. 4-1: System configuration menu
2. Press the [Configuration save] button to start
the backup. Once this is finished, a message
appears on the screen prompting an additional
backup to a USB stick. If you wish to do this, insert
the USB stick into the port on the boiler and
perform the backup.
Restoring the configuration
You can restore the heating system configuration at
any time. The configuration is restored either from a
configuration saved in the ETAtouch control system or
via a USB stick. The counter readings are not
overwritten by this.
Control systems in a wall mounted box are
supplied with a USB stick for backing up the con-
figuration. Leave this in the wall mounted box after you
have restored the configuration.
Restoring the configuration
1. In the system configuration , increase the au-
thorisation to [Service] and open the system con-
figuration menu with the [Systems configuration]
button. To restore a configuration, press the [Con-
figuration restore] button. Another menu
appears:
Fig. 4-2: Restore menu
2. In the upper part of the screen, select the source of
the configuration you wish to restore. Then select
the required backup in the lower part of the screen
with the button.
If the configuration has been loaded from a USB
stick, you should additionally back it up in the
ETAtouch control system. To do this, perform the
backup again.

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[BufferFlex] function block Configuration parameter
5 Configuration parameter
5.1 [BufferFlex] function block
The setting parameters for the buffer are
dependent on the boiler
If the buffer is connected to a boiler with an
independent fuel conveying system (automatic boilers
such as the PelletsUnit, PelletsCompact, HACK, PE-
K), it is also possible to set minimum temperatures for
the buffer.
If the buffer is connected to a log boiler (manual
heating), fewer settings are possible. That is why the
following setting parameters are separated by boiler.
5.1.1 PufferFlex for automatic boilers
5.1.1.1 Basic settings
Basic PufferFlex settings
For the basic function of the buffer, the respective
temperature sensors must be assigned in the buffer
settings.Some of the following parameters can also be
found in the settings of the PufferFlex [Sensor assign-
ments].
Set or check the following parameters.
Explanation of [Total volume]
The whole buffer volume needs to be indicated for this
parameter. This enables the control system to optimise
the charging of the buffer.
Settings
Total volume
Return from consumers
Buffer min.
Buffer off
Buffer
Boiler/buffer producer
Starting after additional criteria
Starting after output
Output via
Extra charge
Activate time programme?
Start time
Immediately charge
Charge buffer min extra
Charge buffer from extra
Res.heat difference
Flow temp raise
Enable temperature
Cascade settingsa
Switching at
Switch-on threshold
Switch-off threshold
Output regulation
Desired charging time
Consumersb
Buffer off
Consumer levelsc
Consumer 1 (top)
(applies also to [Consumer 2] and
[Consumer 3])
Buffer off
a. Only visible if several heat producers charge the boiler
b. Only visible with a single consumer level
c. Only visible with multiple consumer levels

Configuration parameter [BufferFlex] function block
13
Explanation of [Return from consumers]
This temperature is the mean return temperature of all
consumers connected to the buffer. For example:
heating circuits, hot water tanks, external heat
consumers fresh, water modules...
This temperature forms the basis for calculating the
buffer charging status. If the buffer is charged
uniformly with this temperature (e.g.: 35 °C), this is
equivalent to the charge status "0%".
The average should be set for fluctuating return tem-
peratures.
Explanation of [Buffer min.]
This defines the minimum temperature of the buffer
within the configured time window at the allocated
temperature sensor.
The higher this minimum temperature is set, the
larger the heat reserve in the buffer. At the same
time, however, higher temperatures in the buffer
reduce the solar yield. This is because the buffer is
kept at the minimum 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.
Explanation of [Buffer off]
This sets the shutdown temperature for the buffer
charge through the boiler. If the temperature sensor in
the buffer has exceeded the shutdown temperature,
charging of the buffer by the boiler is stopped.
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 shutdown temperature
reduces the number of boiler starts and improves
boiler running time.
Explanation of [Starting after output] and [Output
via]
In most cases, the buffer starts charging as soon as
the temperature sensor has dropped below a minimum
level. Then the boiler starts and, as soon as this is
warm enough, buffer charging begins. These delays
are usually not noticed.
However, these delays may be disruptive for
systems (e.g. district heating) which have to hold
a certain minimum temperature. Therefore, this
parameter can be set to [Yes] in such cases. Then the
boiler starts as soon as the control system calculates a
request on the buffer.
Previously collected control data is used for this
calculation and adjustable factor [Output via]. If the
total of the calculated output multiplied with the factor
[Output via] is greater than the output of the first boiler
to be started, this is switched on for buffer charging.
Example:
Boiler output: 200 kW
[Output via]: 70%
=> If more than 140 kW (200 x 0.7) is calculated, the
first boiler is started in order to load the buffer.
Explanation of the [Extra charge] function
With this function a daily point in time is defined
(=[Start time]) and an upper limit for the outdoor
temperature (=[Charging under outside temperature])
to additionally charge the buffer. This buffer charging is
done independently of the actual consumer require-
ments and independently of the set time windows.
A separate minimum temperature [Charge buffer min
extra] and shutdown temperature [Charge buffer from
extra] can be set for this charge. Charging ends as
soon as the buffer reaches these temperatures.
The function is turned on or off with the parameter
[Activate time programme?].
For an immediate start, the [Immediately charge]
parameter must be set to [On].
Explanation of [Res.heat difference]
This sets the minimum temperature between the heat
producer (e.g. boiler) and the temperature sensor
assigned in the buffer, so that the heat producer may
transfer its residual heat to the buffer. If this difference
is undershot, no more residual heat is fed into the
buffer.
Example: the assigned temperature sensor for the
residual heat is the lowermost buffer sensor and the
temperature here is currently 35 °C.
[Res.heat difference]: 8 °C
=> The boiler may continue to feed its residual heat to
the buffer until the boiler temperature is at only 43 °C
(=35°+8°).
Explanation of [Flow temp raise]
The target temperature of the buffer [Buffer target] is
increased by this value when the buffer is demanding
heat from the boiler.
This ensures that the boiler temperature is sufficient
for reaching the target temperature in the upper
section of the buffer. As long as the boiler has not
reached the target temperature [Boiler tgt.], the boiler
is operated in the high-output range.

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[BufferFlex] function block Configuration parameter
Example:
[Buffer target] = 70 °C
[Flow temp raise] = 5 °C
=> The accumulator tank demands 75 °C from the
boiler. The boiler target temperature is therefore 75°C.
Explanation of [Enable temperature]
This parameter defines the minimum temperature of
the boiler for charging the buffer. Buffer charging can
only occur when the boiler has exceeded this tempera-
ture.
Explanation of [Switching at]
This parameter is used to set the duration for switching
between boilers in cascade systems. This serves to
ensure that the operating period is approximately
identical for all boilers.
In order to switch between the individual boilers,
all boilers must have the same [Boiler order]
setting.
Explanation of [Switch-on threshold]
This parameter can only be set if several heat
producers charge the buffer. This parameter makes it
possible to change the threshold for requesting
another heat producer (e.g. second boiler for charging
the buffer).
Example:
2 boilers with 90 kW output each charge the buffer.
The parameter [Switch-on threshold] is set to 100%.
=> If more than 90 kW (e.g.: 95 kW) is requested, the
second boiler will be activated in order to produce the
missing heat volume (5 kW).
However, if parameter [Switch-on threshold] is
set to 110%, it is possible to request a total of 99
kW (=110% of 90 kW) from the buffer without
actuating the second boiler. This is only activated if
more than 99 kW is requested.
Explanation of [Switch-off threshold]
This parameter can only be set if several heat
producers charge the buffer. This parameter makes it
possible to change the threshold for swtiching off the
additional heat producer (e.g. second boiler for
charging the buffer).
Example:
2 boilers with 90 kW output each are currently
charging the buffer. The parameter [Switch-off
threshold] is set to 80%.
=> If the demand on the boiler falls below 72 kW
(=80% of 90 kW), the last activated boiler will be
switched off again.
Explanation of [Desired charging time]
This parameter defines the time required by the boilers
to charge the buffer to the required target temperature
[Buffer target].
In cascade systems (several boilers charge one
buffer), adjusting this parameter may be helpful
for faster buffer charging. Shortening this time causes
other boilers to fire up sooner to help charge the buffer.
Lengthening the time would extend the running time of
an individual boiler.
Explanation of [Buffer off]
This sets the shutdown temperature for the buffer
charge when the consumer is in operation while
requesting heat from the buffer.
If the temperature sensor in the buffer has exceeded
the shutdown temperature, charging of the buffer ends
and the buffer is charged.
If several consumer levels are configured, a
different shutdown temperature can be set for
each level.

Configuration parameter [BufferFlex] function block
15
5.1.1.2 BufferFlex with solar heating system
Settings - PufferFlex with solar heating system
In addition to the basic settings, further parameters
must be set for controlling the solar heating system.
Explanation of the [Solar heat diss.] function
Optional: only for several buffer storage tanks and
solar heating system
This function defines whether the selected buffer may
take up excess solar heat from a buffer charged by the
solar heating system.
If you set the function with the [Activate?] parameter
set to [Yes], this buffer takes up the solar excess. This
buffer is then charged up to the configured maximum
temperature [...until buffer max].
Explanation of [Solar storage strategy]
Various settings can be made for stratified charging of
the buffer by the solar heating system.
• [Charging by demand]:
The current demands of the consumers on the
buffer and the set minimum temperature of the
solar heating system ([Buffer top min. solar]) are
used to calculate the temperature required for
buffer charging. The solar heating system will only
begin to charge the buffer once the collector
temperature is greater than the calculated
temperature (for charging the buffer).
• [Optimise yield]:
The solar heating system will begin to charge the
buffer as soon as the collector temperature is
greater than the current buffer temperature.
• [Charging according to buffer top min. solar]:
The solar heating system only begins to charge the
buffer once the collector temperature is greater
than the set minimum temperature of the solar
heating system ([Buffer top min. solar]).
Explanation of [Buffer top min. solar]
Optional: only for solar heating systems with stratified
charging
With stratified charging by the solar heating system,
this sets a minimum temperature for the top section of
the buffer. This way, solar charging only takes place in
the top section once the solar panel is at least 7 °C
warmer than [Buffer top min. solar].
However, this minimum temperature only applies
if the conditions for stratified charging are
satisfied. If they are not, solar charging is switched to
the bottom section of the buffer, to make use of the
solar energy.
Buffer
Solar heat diss.a
Activate?
...until buffer max
Solar producer
Solar storage strategyb
Buffer top min. solarb
Buffer max
Priority bottom
Priority topb
Solar priority
Solar priority
Begin solar prio.
Change priority at
End solar prio.
Min. out. temp. Solar prio.
Consumersc
Extra solar heat
from outside temp.
from accumulator tank temperature
Consumer levelsd
Consumer 1 (top)
(applies also to [Consumer 2] and
[Consumer 3])
Excess solar heat
from outside temp.
from accumulator tank
temperature
a. Only visible with several buffer storage tanks and solar
heating system
b. Only visible with stratified charging of the buffer
c. Only visible with a single consumer level
d. Only visible with multiple consumer levels

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[BufferFlex] function block Configuration parameter
Explanation of [Buffer max]
This configurable shutdown temperature sets a
threshold for how much the buffer can be charged by
the solar heating system, to prevent the buffer from
overheating. If the allocated temperature sensor
reaches the configured shutdown temperature, the
solar pump of the solar heating system is switched off.
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.
Function [Solar priority]
Optional: only with solar heating systems
This function is used to allow the solar heating system
connected to the buffer to charge the buffer storage
tank (or combination tank) without firing up the boiler.
For this, 2 time slots are set. During the first time slot
(from [Begin solar prio.] to [Change priority at]), the
boiler is "locked". This means that the boiler is not fired
up to charge the buffer, even if the solar heating
system is not delivering enough heat.
During the second time slot (from [Change priority at]
to [End solar prio.]), the boiler can be fired up to charge
the buffer if the solar heating system does not supply
any heat for more than 15 minutes.
If the [Solar priority] function is not needed, it can
be switched off at any time.
Explanation of [Begin solar prio.], [Change priority
at] and [End solar prio.]
Optional: only with solar heating systems
These parameters are used to set the time slots for the
[Solar priority] function.
The first time slot lasts from [Begin solar prio.] to
[Change priority at]. The second time slot begins with
[Change priority at] and ends with [End solar prio.].
Outside the 2 time slots, the boiler can charge the
buffer at any time.
Set the start of solar priority before the first time
window of the heating circuit and hot water tank.
Otherwise, the boiler may start beforehand, in order to
charge the heating circuit or hot water tank.
During the configured times for solar priority, it
may happen that the heating circuits or the hot
water are not supplied with sufficient heat.
Explanation of [Extra solar heat]
This parameter indicates whether the buffer is transfer-
ring the excess heat from the solar heating system to
the consumers, even if they currently do not need heat.
With the [No] display, the buffer will not transfer any
excess solar heat. If [Yes] is displayed, excess so-
lar heat is forwarded.
The following conditions must be met in order for
the excess solar heat to be passed on in this way:
• The current outside temperature must be higher
than the adjustable value [from outside temp.].
• 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].
• The following temperatures must be exceeded in
the buffer:
–If the [Buffer] function block is configured, the
[Buffer top] temperature must be above the
configurable value [at buffer top] and the
[Buffer bottom Solar] temperature above the
value [at buffer bottom sol.].
–If the function block [BufferFlex] is
configured, the temperature [from accumulator
tank temperature] at the allocated tempera-
ture sensor must be exceeded.

Configuration parameter [BufferFlex] function block
17
5.1.1.3 BufferFlex as a combination tank
Settings - PufferFlex as a combination tank
With a combination tank, you need to set additional
parameters for the hot water treatment.
Explanation of [Switch-on diff.]
Optional: only with combination tank
With a combination tank, this parameter regulates how
far the current warm water temperature can fall before
the hot water tank again demands heat from the boiler.
If the value is set to 15 °C, the current hot water
temperature may drop by 15 °C from the value
[Hot water tank target]. The combination tank does not
demand heat from the boiler unless this happens.
With a combination tank, this value can be set to
approximately 5°C to 8°C if the amount of hot
water is insufficient.
Explanation [Circulation runtime]
Optional: only for circulation pump
This parameter specifies the duration for operating the
circulation pump after it has been started by the control
system. Once this time has expired, the circulation
pump is switched off for the set duration [Circulation
pause].
Example:
[Circulation runtime] = 3 minutes
[Circulation pause] = 10 minutes
If the circulation pump has been started, it is in
operation for 3 minutes and then disabled for
10 minutes. This means that it can only be requested
again by the control system after 13 minutes.
You can determine the required running time of
the circulation pump in the following way. Start
the circulation pump in the control system by means of
manual operation in the inputs and outputs menu. After
starting, measure the time until the fresh water module
warms up the return line for the circulation. This time
(e.g. 3 minutes) is required to heat the hot water pipe.
Then enter this time in parameter [Circulation runtime].
During this time measurement, no hot water may be
tapped (e.g. by sink, shower ...), because otherwise an
incorrect time is measured.
Explanation [Circulation pause]
Optional: only for circulation pump
This parameter sets the pause after a circulation pump
operation. The control system can only restart the
circulation pump after this pause/break has expired.
Example:
[Circulation runtime] = 3 minutes
[Circulation pause] = 10 minutes
If the circulation pump has been started, it is in
operation for 3 minutes and then disabled for
10 minutes. This means that it can only be requested
again by the control system after 13 minutes.
Explanation of [Enable circulation]
Optional: only for circulation pump
This parameter defines the minimum temperature of
the hot water tank for starting the circulation pump. The
circulation pump only starts once the hot water tank
has exceeded this temperature.
Buffer
Hot water area
Switch-on diff.
Circulationa
a. Only visible with additional circulation pump
Circulation runtime
Circulation pause
Enable circulation

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[BufferFlex] function block Configuration parameter
5.1.2 PufferFlex for log boiler
5.1.2.1 Basic settings
Basic buffer settings for BufferFlex on log boiler
The following parameters apply only to the buffer on a
log boiler (without TWIN pellet burner).
If the log boiler is equipped with a TWIN pellet burner,
the setting parameters are the same as for the buffer
with an automatic boiler. For more information, see
chapter 5.1.1.1 "Basic settings".
Set or check the following parameters.
For a buffer with a solar heating system or as a
combination tank, the setting parameters are
identical to the buffer with an automatic boiler. For
more information, see chapter 5.1.1.2 "BufferFlex with
solar heating system" and 5.1.1.3 "BufferFlex as a
combination tank".
Explanation of [Total volume]
The whole buffer volume needs to be indicated for this
parameter. This enables the control system to optimise
the charging of the buffer.
Explanation of [Return from consumers]
This temperature is the mean return temperature of all
consumers connected to the buffer. For example:
heating circuits, hot water tanks, external heat
consumers fresh, water modules...
This temperature forms the basis for calculating the
buffer charging status. If the buffer is charged
uniformly with this temperature (e.g.: 35 °C), this is
equivalent to the charge status "0%".
The average should be set for fluctuating return tem-
peratures.
Explanation of [Res.heat difference]
This sets the minimum temperature between the heat
producer (e.g. boiler) and the temperature sensor
assigned in the buffer, so that the heat producer may
transfer its residual heat to the buffer. If this difference
is undershot, no more residual heat is fed into the
buffer.
Example: the assigned temperature sensor for the
residual heat is the lowermost buffer sensor and the
temperature here is currently 35 °C.
[Res.heat difference]: 8 °C
=> The boiler may continue to feed its residual heat to
the buffer until the boiler temperature is at only 43 °C
(=35°+8°).
Explanation of [Enable temperature]
This parameter specifies the minimum boiler
temperature for charging the buffer when burning logs.
Buffer charging can only occur when the boiler has
exceeded this temperature.
Settings
Total volume
Return from consumers
Buffer
Boiler/buffer producer
Res.heat difference
Enable temperature

Configuration parameter [BufferFlex] function block
19
5.1.2.2 BufferFlex with oil or gas auxiliary
boiler
Settings for log boiler with PufferFlex and
additional oil and gas auxiliary boiler
If an oil or gas auxiliary boiler is installed, additional
parameters can be set.
Explanation of [Buffer off]
This sets the shutdown temperature for the buffer
charge through the boiler. If the temperature sensor in
the buffer has exceeded the shutdown temperature,
charging of the buffer by the boiler is stopped.
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 shutdown temperature
reduces the number of boiler starts and improves
boiler running time.
Explanation of the [Extra charge] function
With this function a daily point in time is defined
(=[Start time]) and an upper limit for the outdoor
temperature (=[Charging under outside temperature])
to additionally charge the buffer. This buffer charging is
done independently of the actual consumer require-
ments and independently of the set time windows.
A separate minimum temperature [Charge buffer min
extra] and shutdown temperature [Charge buffer from
extra] can be set for this charge. Charging ends as
soon as the buffer reaches these temperatures.
The function is turned on or off with the parameter
[Activate time programme?].
For an immediate start, the [Immediately charge]
parameter must be set to [On].
Explanation of [Desired charging time]
This parameter defines the time required by the boilers
to charge the buffer to the required target temperature
[Buffer target].
In cascade systems (several boilers charge one
buffer), adjusting this parameter may be helpful
for faster buffer charging. Shortening this time causes
other boilers to fire up sooner to help charge the buffer.
Lengthening the time would extend the running time of
an individual boiler.
Explanation of [Buffer off]
This sets the shutdown temperature for the buffer
charge when the consumer is in operation while
requesting heat from the buffer.
If the temperature sensor in the buffer has exceeded
the shutdown temperature, charging of the buffer ends
and the buffer is charged.
If several consumer levels are configured, a
different shutdown temperature can be set for
each level.
Settings
Buffer off
Buffer
Boiler/buffer producer
Starting after additional criteria
Extra charge
Activate time programme?
Start time
Immediately charge
Charge buffer min extra
Charge buffer from extra
Output regulation
Desired charging time
Consumersa
a. Only visible with a single consumer level
Buffer off
Consumer levelsb
b. Only visible with multiple consumer levels
Consumer 1 (top)
(applies also to [Consumer 2] and
[Consumer 3])
Buffer off

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[Hot water tank] function block Configuration parameter
5.2 [Hot water tank] function block
Parameters to be set
Set or check the following parameters.
Explanation of [Switch-on diff.]
This parameter regulates how far the current warm
water temperature can fall before the hot water tank
again demands heat from the buffer or boiler.
If the value is set to 15 °C, the current hot water
temperature may drop by 15 °C from the value
[Hot water tank target]. The hot water tank only
demands heat from the buffer or boiler when this
happens.
Explanation of [HW bottom off]
Optional: only with additional [Hot water tank bottom]
temperature sensor
This parameter defines when charging of the hot water
tank will end. As soon as the additional [Hot water tank
bottom] temperature sensor in the hot water tank
reaches the adjustable [HW bottom off] temperature,
charging of the hot water tank ends.
Explanation of [Flow temp raise]
The target temperature of the hot water tank [Hot water
tank target] is increased by this value and demanded
from the heat producer.
Example:
[Hot water tank target] = 50 °C
[Flow temp raise] = 5 °C
=> 55 °C is demanded from the heat producer.
Explanation of [Enable temperature]
Minimum temperature of the heat producer (buffer or
boiler) for enabling the hot water charging pump. If the
buffer is the heat producer for the hot water tank, the
factory setting is 35 °C. If the boiler is the heat
producer, the setting is 58 °C.
In heating systems without a buffer and with the
"PelletsUnit" boiler, this parameter is not visible.
In heating systems without a buffer storage tank, set
this value 5 °C above the minimum return temperature;
see the table below.
Explanation of [Register performance]
This parameter indicates the heat capacity of the
register in the hot water tank. The factory setting is
calculated with 70% of the boiler's rated output.
Example: Boiler with rated output of 25 kW results in
a register output of 17.5 kW.
If the register output of the installed hot water tank is
known, this value must be set. For single family
homes, this value is usually between 15 and 20 kW.
If the exact register output is not known, use the
following estimates for parameter [Register per-
formance]:
• At a rated boiler output of 15 kW, use the rated
boiler output as the register output.
• If the rated boiler output is above 15 kW, select ap-
proximately 20 kW.
It is important that this parameter is checked and
adjusted because if the value is too high, output
regulation of the boiler or buffer, respectively, will be
impaired.
Hot water tank
Switch-on diff.
HW bottom off
Flow temp raise
Enable temperature
Register performance
Hot water tank max.
Sol. chg. until
Solar heat diss.
Priority
Circulation
Circulation runtime
Circulation pause
Enable circulation
Boiler Value
PelletsCompact 20-32 kW 60 °C
PE-K 32-90 kW 60 °C
HACK 20-200 kW, Fuel: Pellets 60 °C
HACK 20-200 kW, Fuel: Woodchips 65 °C