eta PelletsCompact33-50 kW, Operation

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ETAtouch controller [Buffer] function block
37
The factory setting for this parameter is 40°C.
The value should be at least 5 - 10°C above the
average return temperature of the consumers, but no
more than 70°C.
A high [Buffer bottom off] temperature reduces the
number of boiler starts and improves boiler running
time.
The parameter can be found under:
5.3.4.3 Function [Extra charge]
Explanation of the [Extra charge] function
This function defines a daily point in time for the buffer
(=[Extra charging from]) to charge the buffer addition-
ally. This charging is done independently of the actual
consumer requirements and independently of the set
time windows.
A separate minimum temperature [Buffer top min.] and
shutdown temperature [Buffer bottom off] can be set
for this charge. Charging ends as soon as the buffer
reaches these temperatures.
The function is deactivated if one of the two tem-
peratures is set to "0".
The parameters can be found under:
At first, set the parameter [Extra charge
activated?] to [Yes], and then the other
parameters will be displayed.
To immediately start this additional buffer charge,
simply set parameter [Chrg. button] to [On].
5.3.4.4 Solar heat diss.
Explanation of the [Solar heat diss.] function
Optional: only for several buffer storage tanks and
solar heating system
This function defines whether the selected buffer may
take up excess solar heat from a buffer charged by the
solar heating system.
If you set the function with the [Activate?] parameter
set to [Yes], this buffer takes up the solar excess. This
buffer is then charged up to the configured maximum
temperature [...until buffer max].
The parameter can be found under:
5.3.4.5 Priority of the upper and lower
sections
Explanation of [Priority]
Optional: only with solar heating system and buffer
with 2 internal coils
This parameter sets the priority of the top and bottom
sections of the buffer for solar charging. A high priority
means that this section will be charged by the solar
heating system first. A low priority means that it will be
charged last.
The priority for the top and bottom section of the buffer
can be found under:
5.3.4.6 Buffer top min. solar
Explanation of [Buffer top min. solar]
Optional: only for solar heating systems with stratified
charging
With stratified charging by the solar heating system,
this sets a minimum temperature for the top section of
the buffer. This way, solar charging only takes place in
the top section once the solar panel is at least 7 °C
warmer than [Buffer top min. solar].
However, this minimum temperature only applies
if the conditions for stratified charging are
satisfied. If they are not, solar charging is switched to
the bottom section of the buffer, to make use of the
solar energy.
The parameter can be found under:
Buffer
Buffer bottom
Buffer bottom off
Buffer
Extra charge
Extra charge activated?
Buffer top min.
Buffer bottom off
Extra charging from
Chrg. button
Buffer
Solar heat diss.
Activate?
...until buffer max
Buffer
Buffer top Solar
Priority
Buffer bottom Solar
Priority
Buffer
Buffer top Solar
Buffer top min. solar