The pump will switch off if the conditions according to the following table are true:
(SolPanelTemp – DHWLowerTemp) < delta Toff |
AND |
OR |
|
(SolPanelTemp – BufferLowerTemp) < delta Toff |
|||
The solar heat power < 3 x electrical power of collector pump |
|||
The switch off delay is equal to:
PMP-01 + (20 - FilteredOATemp)*(PMP-01 - PMP-02)/ 35
The switch off delay starts after the temperature difference conditions are fulfilled. The switch off delay is equal PMP-01 when the outdoor temperature is > 20°C.
The pump will switch off if the solar power is not at least 3 times the electric power of the pump.
If the input “SolarPower” has the value -999, this switch off condition will be ignored.
When the pump switches off due to a too low solar power, the pump will stay off for a fixed time of three minutes before it can start again.
When the pump restarts after low solar power, it will run for a minimum time of two minutes before the solar power control can switch it off again.
After these two minutes all the system delays should be compensated and the macro should measure the correct solar and electrical power.
The electrical power of an on/ off pump (CFG-02 = 1) is equal to its nominal power PMP-06.
The electrical power of a variable speed pump (CFG-02 = 2) is proportional the pump speed to the power of three and equal to (SolPumpCtrl/100)3 * PMP-06. At 100 % pump speed the power is equal to the nominal power.
Find the solar power calculation in the description of the macro TTB_SolarEnergy.
Table 10. Parameter List
Description |
Value Range |
Default Value |
Unit |
SOLP-02: temperature difference to switch off/ over |
-30 … 30 |
3 |
K |
PMP-01: pump switch off delay at 20 °C |
0…120 |
10 |
sec |
PMP-02: pump switch off delay at -15 °C |
0…120 |
10 |
sec |
PMP-06: pump nominal electrical power |
0…50000 |
50 |
W |