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Installation Indications, functions and options MessagesCommissioningOperation and function
Cooling functions
In the following the 3 cooling functions – collector cooling, system cooling and store
cooling – are described in detail. The following note is valid for all three cooling
functions:
Note
The cooling functions will not become active as long as solar loading is possible.
Collector cooling
OCC
Collector cooling option
Adjustment range: OFF / ON
Factory setting: OFF
CMX
Collector maximum temperature
Adjustment range: 70 … 160 °C [150 … 320 °F]
Factory setting: 110 °C [230 °F]
The collector cooling function keeps the collector temperature within the operat-
ing range by heating the store. If the store temperature reaches 95 °C [200 °F] the
function will switch off for safety reasons.
If the store temperature exceeds the adjusted maximum store temperature, the
solar system is switched off. If the collector temperature increases to the adjusted
maximum collector temperature, the solar pump is activated until the collector
temperature falls below the maximum collector temperature. The store temper-
ature may then exceed the maximum store temperature, but only up to 95 °C
[200 °F] (emergency shutdown of the store).
If the collector cooling function is active, ⓵ and ☼ are displayed (ashing).
Note
This function will only be available if the system cooling function (OSYC)
is deactivated.
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.
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