External un-controlled charging loads the buffers starting from the level where the supply temperature is higher than the buffer sensor down to the lower sensor.
If the heat in the buffer is insufficient and the temperature of the upper sensor falls below the heat demand – DCHG.02:
BufUpperTemp < HeatDemandIn - DCHG-02(5K)
When the upper temperature will be higher than the heat demand + DCHG-01:
BufUpperTemp > HeatDemandIn + DCHG-01(8K)
Table 6. Parameter List
Description |
Value Range |
Default Value |
Unit |
DCHG-01: temperature difference switch to buffer |
0 ... 50 |
8 |
K |
DCHG-02: temperature difference to switch to boiler(s) |
0 ... 50 |
3 |
K |