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Cooling mode
In the Cooling mode menu, different cooling functions are available. They can
be used for keeping the solar system operational for a longer time during strong
solar irradiation.
For this purpose, the adjusted maximum store temperatures can be exceeded. The
store order for this overloading can be adjusted. Additionally, each individual store
can be excluded from this function.
Two different variants are available for the cooling mode: the system cooling and the
collector cooling.
System cooling:
If the system cooling variant has been selected and the switch-on temperature dif-
ference is exceeded, store loading is continued even if the corresponding maximum
temperature is exceeded, but only up to the emergency shutdown temperature.
Store loading continues until all stores have reached the emergency shutdown
temperature or until the switch-off temperature difference is reached.
Collector cooling:
If the collector cooling variant has been selected, store loading is continued or
reactivated when the collector maximum temperature is exceeded.
Store loading continues until all stores have reached the emergency shutdown
temperature or until the collector temperature falls below the collector maximum
temperature by at least 5 K.
In 2-collector systems, separate adjustments can be made for each collector fi eld.
The control logic regards collector cooling operation as solar loading. The adjust-
ed values for delay, minimum runtime, etc. remain valid.In addition to the cooling
mode, store cooling is available.
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.
When the store cooling function is activated, the solar pump is switched on if
the maximum store temperature is exceeded and the collector temperature falls
below the store temperature. The solar pump remains active until the store tem-
perature falls below the adjusted maximum store temperature. The store order for
the cooling is the same as in the overheating through system- or collector cooling.
The holiday function works like the store cooling function but aims to cool the
store further down during times without DHW consumption in order to prepare
it for solar loading on the following day. This function can only be activated if the
store cooling function is activated.
The holiday function can either be activated manually when a phase with no DHW
consumption begins, or a time frame, during which the function is to become ac-
tive, can be set in advance. If manual is selected, an input can be allocated to the
function. When a switch is connected to the allocated input, it will act as an on/off
switch for the holiday function.
Solar / Opt. functions / Add new function / Cooling mode
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Variant
Cooling logic variant
Col. cool, Syst. cool., Off Off
Tcolmax.
Collector maximum temperature 70 … 190 °C
100 °C
Store
(1 … 4)
Store succession order
system dependent
system depend-
ent
St cooling Store cooling
Yes, No
No
D
Ton
Switch-on temperature difference 1.0 … 30.0 K
20.0 K
D
Toff
Switch-off temperature difference 0.5 … 29.5 K
15.0 K
Holiday
Holiday function
Yes, No
No
Activation Activation mode
Manual, Timer
Timer
On
Holiday function switch-on date
Dates up to 31.12.2099 current date
Off
Holiday function switch-off date
Dates up to 31.12.2099 On + 7 days
Input
Holiday function switch input
system dependent
system de-
pendent
Stmax
(1 … 4)
Maximum store temperature
holiday function
4 … 95 °C
40 °C
Summary of Contents for SC5.14
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