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Protective functions
In hydraulic systems with solar when the recooling function is activated excess energy from the storage tank is fed
back into the collector. This only takes place if the temperature in the storage tank is higher than the value “Recool
Tsetpoint” and the collector is at least 20°C cooler than the storage tank and before the storage tank temperature has
dropped below the value “Recool Tsetpoint”. In systems with two storage tanks the setting applies to both storage
tanks.
Recooling - Settings range: On, Off / Default setting: Off
Recooling Tref - Settings range: 0°C to 99°C / Default setting: 70°C
5.3. - Recooling
Caution
Energy is lost via the collector when Recooling is active! Recooling should only be active
in periods with very little demand for heat e.g. during longer absence / holidays.
Caution
This function causes energy to be lost via the collector! It is normally not activated for solar
systems with antifreeze.
Observe the operating instructions for the other system components!
A two-stage frost protection function can be activated. In stage 1 the controller switches the pump on for 1
minute every hour if the collector temperature drops below the set value “Frost stage 1”.
If the collector temperature drops further to the set value “Frost stage 2” the controller switches the pump on
continuously.
If the collector temperature then exceeds the value “Frost stage 2” by 2°C, then the pump switches off
again.
Frost protection setting range: on, off/default setting: off
Frost stage 1 setting range: from -25°C to 10°C or off/default setting: 7°C
Frost stage 2 setting range: from -25°C to 8°C/default setting: 5°C
5.4. - Frost Protection
If the seizing protection is activated, the controller switches the relay in question and the connected
consumer on every day at 12:00 (setting “daily”) 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.
Setting range R1: daily, weekly, off/default setting: Off
Setting range R2: daily, weekly, off/default setting: Off
Setting range R3: daily, weekly, off/default setting: Off
5.5. - Seizing protection
5.6. - Collector alarm
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 in the display.
Collector alarm - Settings range: On / Off / Default setting: Off
Collector Tmax - Settings range: 60 °C to 299 °C / Default setting: 115 °C
Delay settings range: 1 - 60 minutes / Default: 1 minute
