eta PelletsCompact 20-32 kW, Operation

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[Solar] function block ETAtouch controller
5.7.6 Text menu - Adjustable parameters
5.7.6.1 Collector min
Explanation of [Collector min]
This parameter sets the minimum temperature for
starting the solar pump. The solar pump can only be
started once the solar panel has exceeded this tem-
perature.
Do not set this temperature too high, to ensure
that it is possible for heat to supplied to pre-heat
the tank even when there is little sunlight. The optimal
range is between 30 °C and 50 °C.
The parameter can be found under:
5.7.6.2 Target collector diff.
Explanation of [Target collector diff.]
This parameter sets the desired temperature
difference between the solar panel and the connected
tank (buffer or hot water tank). This temperature
difference is controlled by adjusting the speed of the
solar pump.
If the buffer is being charged by the 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 pump. This way, a smaller
quantity of water is conveyed through the solar panel.
The water remains in the solar panel for a longer time,
and therefore produces a higher working temperature
in the panel. Consequently, a higher hot water
temperature is achieved, but there are also more
losses from the solar panel.
A low temperature difference results in a high
speed of the solar pump. A larger quantity of
water is therefore conveyed through the solar panel.
The water remains in the solar panel for a short time,
and so also becomes less hot. The working
temperature of the solar panel is therefore lower, but
there are fewer losses via the solar panel.
The parameter can be found under:
State
Collector
Collector min
State
Collector pump
Target collector diff.