eta TWIN - [Buffer] Function Block - TWIN Parameters

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[Buffer] function block – TWIN Configuration parameter
6.3 [Buffer] function block – TWIN
6.3.1 Basic settings
Basic buffer settings for log boiler with TWIN pellet
burner
Set or check the following parameters.
Detailed descriptions of the parameters are provided
below.
Explanation of [Buffer top min.]
This parameter defines the minimum temperature of
the buffer storage tank inside the configured time
window.
The factory setting for this parameter is 10°C.
The higher this temperature is set, the larger the
heat reserve in the buffer. At the same time, however,
higher temperatures in the buffer reduce the solar
yield. because the buffer is kept at this minimum
temperature by the oil or gas auxiliary 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 [Boiler tgt.]
The boiler's target temperature is set with this
parameter.
The factory setting is 80 °C and may only be
changed when a higher flow temperature is
required.
Explanation of [Hysteresis top]
The target temperature of the buffer [Buffer target] is
calculated from the current requirements of the
consumers and the [Buffer top min.]. This temperature
is additionally increased by the set value [Hysteresis
top], and this is then the new target temperature for the
buffer.
This parameter only works for the oil or gas
auxiliary boiler and not the log boiler.
Example:
Temperature demanded by the consumers = 64 °C
[Hysteresis top] = 6 °C
=> Target temperature of the accumulator tanks [Buffer
target] = 70 °C
In systems with low consumer temperatures
(underfloor heating only, for example), the
hysteresis can be increased. In systems with high
consumer temperatures, the hysteresis can be
reduced.
Buffer
Buffer top
Buffer top min.
Boiler tgt.
Hysteresis top
Flow temp raise
Enable temperature
... with TWIN
Buffer bottom
Buffer bottom off
Enable difference
demanded output
Effective buffer volume [l]
Desired charging time
Return from consumers
Start relief
Full buffer charge with pellets
Residual heat usage
Residual heat usage
Enable res. heat
Extra charge
Buffer top min.
Buffer bottom off
Start time