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[Solar] function block
Configuration parameter
5.4
[Solar] function block
Parameters to be set
Set or check the following parameters.
Explanation of [Speed control]
The speed control needs to be set in order to control
the solar pump.
Possible selections:
•
[On/Off]
Output is only switched on (100%) or off (0%).
There is no speed control.
•
[Pulse packet for NON-EC pumps]
Variable speed control for non-electronically
controlled standard pumps.
•
[Laing/Lowara boiler pump for PU/PC]
For pumps of the PelletsUnit and PelletsCompact
boiler, made by LAING or LOWARA
•
[Heating pump (see info button)]
For electronically controlled pumps with heating
characteristic curve. This pump runs if the signal
cable is unplugged.
The signal cable of this pump can be
connected to the [GM-C2] circuit board or
higher. If this pump is connected to the [GM-C1]
circuit board, a 2.2 kiloohm series resistor must be
clamped to the signal cable, because the [GM-C1]
circuit board has a control voltage of 24 V.
•
[Solar pump (see info button)]
For electronically controlled pumps with solar char-
acteristic curve. This pump will not run if the signal
cable is unplugged.
The signal cable of this pump can be
connected to the [GM-C2] circuit board or
higher. If this pump is connected to the [GM-C1]
circuit board, a 2.2 kiloohm series resistor must be
clamped to the signal cable, because the [GM-C1]
circuit board has a control voltage of 24 V.
•
[0-10 V analogue]
Pump speed is controlled by way of a 0-10 V
signal.
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.
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,
Outputs
Collector pump
Speed control
State
Collector
Collector min
Collector pump
Target collector diff.
Switch-on diff.
Switch-off diff.
