This function will be active if the input “ExtLoading” = 1 for both charging and discharging control.
The engineer has to connect the input “ExtLoading” to a “1” only if the charging is done external from process heat, a solar panel or other uncontrolled heat sources.
In all configurations the heat demand of the consumers connected to the buffer will:
During external loading if the input „ExtLoading” = 1, the heat demand will be decreased by the value defined in the parameter SOL-01 and the output “Buf_SpShift” will display the effective value of SOL-01.
When the input „ExtLoading” switches back to “0”, the heat demand at the input “HeatDemandIn” will be transmitted to the output and the output “Buf_SpShift” will be “0” after the delay time defined in the parameter SOL-02.
To save heating energy during external un-controlled loading of the system buffer, the heat demand transmitted from the buffer to the heating strategy can be reduced by the value defined in parameter SOL-01. This way we can assure that, we completely use the solar, heat pump or other external heating sources, before we switch on the heat generators. This heat demand shift is kept during the buffer loading and ends after a switch off delay defined in the parameter SOL-02 (15 min) after the loading is finished.
To disable this function set SOL-01 to the value “0“. When you never want to start the heat generators during buffer charging, setting SOL-01 to 70 K, you would need a heat demand of 90 K to start the boilers during buffer loading. (The heating strategy needs a minimum heat demand of 20 °C to start)
Table 7. Parameter List Heat demand shift
Description |
Value Range |
Default Value |
Unit |
SOL-01: heat demand decrease during uncontrolled loading |
0…90 |
15 |
K |
SOL-02: switch off delay heat demand decrease after external loading |
0…480 |
15 |
min |