STIEBEL ELTRON SOM 10 - Manual (Page 41)

en
41
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 tem-
peratures can be exceeded. The store order for this
overloading can be adjusted. Additionally, each indivi-
dual 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 difference 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 tempe-
rature 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 maxi-
mum temperature by at least 5 K.
In 2-collector systems, separate adjustments can be
made for each collector field.
The control logic regards collector cooling operation
as solar loading. The adjusted values for delay, mini-
mum 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 tempera-
ture is exceeded and the collector temperature falls
below the store temperature. The solar pump remains
active until the store temperature falls below the ad-
justed 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
active, 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.