EbV Product documentation THETA NORM/UNIT
8-53
8.7 Tank charge changeover
In systems that have both an external hot water tank and a buffer tank, a diverter valve can be used to switch
between loading the hot water tank and loading the buffer tank from solar equipment.
Description: The use of a changeover delay (Parameter 15 solar tree) sometimes causes
problems. To ensure that the solar collector in priority operation can be loaded,
checks are performed at regular intervals whether a sufficient temperature is reached
for charging the tank.
Changeover
requirements: If the changeover temperature in the primary tank is not reached and the solar
charge in the secondary tank is active, then:
After a set time of 30 minutes, the SOP is switched of for the time of the set value
(Parameter 15) and the temperature difference between SPFS (solar panel flow
sensor) and SCVS (solar tank charge valve sensor) is checked to see if it fulfills the
switch-on requirement.
If, in the meantime, the switch-on requirement for charging the primary tank is
fulfilled, the charging in the primary tank is started immediately.
This check does not take place if the actual temperature of the primary tank + switch-
on differential >= final switch-off temperature.
Function: This function allows switching a diverter valve according to the load condition of two
heat storage tanks (2-point output).
The solar energy charging of the DHW tank is prioritised according to the settings of
the solar control. In this case, the SCVS (solar tank charge valve sensor) is used
instead of the SBUS and the changeover temperature is used for charging instead of
the solar tank maximum limit.
If the set changeover temperature in the DHW tank is reached or the switching
differential between SPFS and SCVS is insufficient for charging the DHW tank, the
solar charge control changes over to the buffer tank.
Operation Solar load switch:
Setting only possible if an SOP is set.
Note on operation Key / parameter tree Parameter
Solar charge valve HYDRAULIC PARAMETER 06
or
PARAMETER 07
Solar tank charge valve sensor HYDRAULIC Automatic assignment
Switch delay SOLAR PARAMETER 15
Switch-over temperature SOLAR PARAMETER 16
To Next Page
Loading...
Need help?
General
