Rotex Controller Series, Product Documentation

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EbV Product documentation THETA NORM/UNIT
8-54
8.8 Heat forced dissipation valve
Function: This function allows preventing the degassing of the medium at high solar panel
temperatures in solar power systems. Such degassing can occur when the solar heat
tank is full (maximum temperature exceeded) and, consequently, forced dissipation
into the heat tank is impossible. In this case, the solar pump is switched off and the
solar panel temperature rises.
Description: The function of the solar forced heat dissipation valve involves a forced switch-off of
the SOP when the final switch-off temperature is exceeded.
This function is independent of the assignment of a forced-dissipation valve to a
variable output. The setting OFF will be added.
The final switch-off setting is independent of the preset solar panel maximum
temperature and can be lower than the latter. In this way there are independent
forced switch-on and forced switch-off functions for the SOP.
The solar forced heat dissipation output is energized under the following conditions:
• Function enabled for solar tank temperatures in excess of the maximum
temperature.
• When the solar panel temperature rises above the set solar panel maximum
temperature the output is switched on while the solar loading pump continues
running.
• When the solar panel temperature rises above the set final switch-off temperature
the SZV output and the solar loading pump are switched off.
Operation: This function can be selected only if an SOP has been set.
CAUTION When this function is active, the solar loading pump continues running even when
the solar panel temperature exceeds the set solar panel maximum temperature.