Collector Cooling Function - Viessmann VITOSOLIC 200 Installation And Service Instructions Manual

Function description

Collector cooling function

■ Solar circuit pump off:
When reaching the selected set tem-
perature "Tcyl set".
■ The solar circuit pump will start long
enough to enable this temperature to
fall by 5 K, if the collector temperature
rises to the selected maximum collec-
tor temperature "Tcolmax". The cyl-
inder temperature can then rise fur-
ther, but only up to 90 ºC.
■ You can select the consumer to which
the collector cooling function applies.
Delivered condition: This function
affects all consumers.
Note
Ensure the intrinsic safety of the solar
thermal system by accurately sizing the
diaphragm expansion vessel, even if the
collector temperature continues to rise
after the system has reached all limit
temperatures.
The solar circuit pump will be locked out
or stopped in case of stagnation or when
the stop temperature "Tcolemoff" (see
page 118) is reached. This prevents a
thermal overload of the connected com-
ponents.
128
Make the following settings at the
solar control unit:
1. Main menu
■ "Solar"
■ "Options"
– "Col.cool.fct"
Set "Yes".
2. Main menu
■ "Solar"
■ "Setting values"
– "Tcolmax"
Set a value.
3. Main menu
■ "Solar"
■ "Contractor"
– "Col.cool.cyl"
Select consumers.