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This function enables to release excess heat from the storage tank consi-
derately and without solar fluid overheating, via piping and collectors into
the ambient air. It is recommended to keep activated.
Protection against pump seizing by regular short running of a pump or a valve. Seizing may
occur after longer inactivity of valves or pumps. If the seizing protection is activated, the contro-
ller switches the relay in question and the connected solar consumer on every day at 12:00 or
weekly on Sundays at 12:00 (setting “weekly”) for 5 seconds in order to prevent the pump and/
or the valve from sticking after an extended stationary period.
A two-stage frost protection function is available. In stage 1 the controller switches
the pump on for 1 minute every hour if the collector temperature drops below the set
value “
Frost level 1
”. If the collector temperature drops further to the set value “
Frost
level 2
”, the controller switches the pump on continuously. If the collector temperature
then exceeds the value “
Frost level 2
” by 2 °C, then the pump switches off again.
5.4. - Frost protection
Protective functions
Protective functions
At the end of a sunny day the temperature in a storage tank may easily reach high
values. In order to prevent further temperature increase the next day, excess energy
can be released into the air via collectors under cloudy conditions or after sunset. If
the temperature in the storage tank exceeds the value “
Recool Tsetpoint
” and the
collector is at least by 20 °C cooler than the storage tank, the solar pump starts. The
storage tank is then cooled down until the “
Recool Tsetpoint
” is reached. In systems
with two storage tanks the setting applies to both the storage tanks.
This function enables to release excess heat from the storage tank con-
siderately and without solar fluid overheating, via piping and collectors
into the ambient air. It is recommended to keep activated.
5.5. - Seizing protection
If this temperature is exceeded at the collector sensor when the solar pump is on, a
warning or error message is triggered. A warning message is shown on the display.
5.3. - Recooling
5.6. - Collector alarm
Caution
Caution