The start of the charging pump depends on the domestic hot water valve configuration.
Configuration with a 3-way Valve, CFG-01 = 1
The charging pump starts when the internal controller signal is > 3% and stops with a switching differential of 2 %. This pre-circulation allows the rising of the system flow temperature.
The valve transmits the internal control signal if the following conditions are fulfilled
The valve closes and the pump stops if the internal control signal is <= 1%, or the system flow temperature is lower than the buffer upper temperature (UWT).
In this configuration the valve is a bypass valve. You can connect an analog or a digital datapoint to this valve output.
The pump will also start if one of the following protection functions is active:
Table 4. Parameter List
Description |
Range |
Default |
Units |
SST-01: temp. difference primary/ secondary system |
0...60 |
10 |
K |
PRP-01: start-up delay primary/ secondary pump |
0...600 |
120 |
sec |