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INSTALLER SETTING
Solarthermal system - Solar collector operating range
Solarthermal system - Solar tank temp. limit
Solarthermal system - Solathermal dT
Basically, the Solar pump starts if the Collector temperature (TB_SENSOR/SOLAR) is higher than
the temperature at bottom part of the DHW tank (CN_TH4/WATER TANK SENSOR(B)). By
default, the pump starts when the collector is 8 degrees warmer and stops when it is only 2
degrees warmer. This is because some heat losses can be expected on the way from roof to the
technical room.
Additionally, the pump is turned off, when either the collector or the tank reaches it’s maximum
temperature. The values can be adjusted based on local conditions.
A) Solarthermal system - Solar collector operating range - Min
B) Solarthermal system - Solar collector operating range - Max
C) Solarthermal system - Solar tank temp limit - Max
D) DHW target temperature (User setting)
Defaults
Temp
Time
135 °C
2 3
1
80 °C
1 0 °C
4
50 °C
Time
Solar pump
On
Off
6
5
7 8
A
B
C
D
No Event
1 Solar pump starts, because Collector temp. is eight degrees warmer than the tank
2 Solar pump stops, because Collector temp. is only two degrees warmer.
3
After cloudy period, the Collector temp. rises again. Solar pump starts, because Collector
temp. is again eight degrees warmer than the tank.
4
The collector is still five degrees warmer, but the pump stops, because the tank has
reached its maximum temperature of 80°C.
5 In the evening, the tank temperature drops due to consumption.
6
The heat pump re-heats the DHW tank up to its setpoint of 50°C, as the collector is not
hot enough.
7
The next morning, the Solar pump starts, because Collector temp. is eight degrees
warmer than the tank.
8
The collector has reached its maximum temperature of 135°C. The pump stops. The
solar fluid inside of the collector evaporates and pushes the liquid into the pipeworks.
The Solar system is at standstill.
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