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Cooling functions
Different cooling functions can be activated: system cooling, store cooling and heat
dump.
Note:
If the temperature at the store sensor reaches 95 °C, all cooling functions
will be blocked. The switch-on hysteresis is -2 K.
Note:
If one of the cooling functions or the antifreeze function is activated, the
drainback option will not be available.
System cooling
The system cooling function aims to keep the solar system operational for a longer
time. The function overrides the maximum store temperature to provide thermal
relief of the collector eld and the heat transfer uid on hot days.
If the store temperature is higher than the adjusted maximum store temperature
and the switch-on temperature difference DTCO is reached, the solar pump re-
mains switched on or will be switched on. Solar loading is continued until either
the temperature difference falls below the adjusted value DTCF or the collector
limit temperature is reached.
In 2-store systems the sequence of the stores can be adjusted.
If the system cooling is active, ☼ is displayed (ashing).
Note:
This function will only be available if the collector cooling function, the
heat dump function, and the drainback option are not activated.
Store cooling
When the store cooling function is activated, the controller aims to cool down the
store during the night in order to prepare it for solar loading on the following day.
If the adjusted maximum store temperature is exceeded and the collector tem-
perature falls below the store temperature, the system will be reactivated in order
to cool down the store.
DT O and DT F (LOAD 1/2) are used as the reference temperature differences.
DTCO
Switch-on temperature difference
Adjustment range: 1.0 … 30.0 K
Factory setting: 20.0 K
DTCF
Switch-off temperature difference
Adjustment range: 0.5 … 29.5 K
Factory setting: 15.0 K
OSTC
Store cooling option
Adjustment range: OFF / ON
Factory setting: OFF
OSYC
System cooling option
Adjustment range: OFF / ON
Factory setting: OFF
COOL 7
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