Cosmo Multi 2 - 4. Functions and Options - Cooling and Frost Protection; Cooling Function (1-store Systems); Collector Cooling Function; Recooling Function

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Collector cooling function:
Solar/Options/col. cooling
selection: „Yes“, „No“
factory setting: „No“
if you select „Yes“:
Solar/adj. values/Tcolmax
adjustment range: 80 ... 160 °C
factory setting:: 110 °C
hysteresis 5 K
The collector cooling function starts, when the adju-
sted maximum collector temperature is reached. If
this temperature is underrun by 5 K, this function is
switched off.
The collector is cooled via the heat transfer to the next
free store (a store which is not blocked). The numeri-
cally last store is not used (swimming pool protection
or in the case of multi-store systems).
The pump output (provided that the function is active)
is controlled with maximum relative pump speed.
Note:
It is not possible to adjust a temperture value for the
maximum collector temperature (Tcolmax) which is
higher than the collector emergency shutdown tempe-
rature. There must be a difference between these two
temperatures of at least 10 K.
2-collector systems:
2 separated collector circuits (2 pumps):
The collector circuit which needs to be cooled is ope-
rated. If one store is being loaded by another collector,
this loading is continued.
shared collector circuit (1 pump):
“Pump speed“ depends on collector cooling which
takes priority.
Cooling function (1-store systems)
:
Solar/Options/cool func.
selection: „Yes“, „No“
factory setting: „No“
The cooling function can be used in 1-store systems
(basic systems 1 and 2). If the store temperature ex-
ceeds its maximum limitation (Tstmax), the surplus en-
ergy in the collector can be diverted. The pump output
uses maximum pump speed.
Function (switching conditions):
If Tstmax is exceeded, and the switch-on temperature
difference DTon between collector and store are rea-
ched, the solar circuit (primary) and the cooling relay
are operated.
If the switch-off temperature difference DToff is under-
run during this period, the solar circuit and the cooling
relay are switched off.
2-collector system:
(basic system 2)
In this system, only the collector circuit which fulfills
the switch-on conditions described above, is operated.
4. Functions and options