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System cooling
OSYC
System cooling option
Adjustment range: OFF / ON
Factory setting: OFF
DTCO
Switch-on temperature difference
Adjustment range: 1.0 … 30.0 K [2.0 … 60.0 °Ra]
Factory setting: 20.0 K [40.0 °Ra]
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 tem-
perature is higher than the adjusted maximum store temperature and the switch-
on temperature difference DTCO is reached, the solar pump remains 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. If the system cooling function is active, ⓵ and ☼ are displayed (ashing).
DTCF
Switch-off temperature difference
Adjustment range: 0.5 … 29.5 K [1.0 … 59.0 °Ra]
Factory setting: 15.0 K [30.0 °Ra]
Note:
This function will only be available, if the collector cooling function
(OCC) is deactivated.
Store cooling
OSTC
Store cooling option
Adjustment range: OFF / ON
Factory setting: OFF
OHOL
Holiday cooling option
Adjustment range: OFF / ON
Factory setting: OFF
THOL
Holiday cooling temperature
Adjustment range: 20 … 80 °C [70 … 175 °F]
Factory setting: 40 °C [110 °F]
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 (S MX) is exceeded and the collector
temperature falls below the store temperature, the system will be reactivated in
order to cool down the store. Cooling will continue until the store temperature
has fallen below the adjusted maximum store temperature (S MX) again. A hyster-
esis of 2 K [4 °Ra] is set for the store cooling function.
Reference threshold temperature differences for the store cooling function are
DT O and DT F.
If no DHW consumption is expected for a longer period of time, the additional
holiday cooling option OHOL can be activated in order to extend the store cool-
ing function. The adjustable temperature THOL then replaces the maximum store
temperature (S MX) as the switch-off temperature for the store cooling function.
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