Operation Manual

6 720 645 349 (2010/09)
52 | Menu settings INSTALLER SETTINGS (contractors only)
8.5 Parameters for solar thermal system
Installer settings: Solar sys parameters
For menu structure and setting ranges
Æ page 45.
The factory settings of the parameters in this
menu are generally suitable for most common
system dimensions. Use this menu if you want to
finely adjust the parameters to suit the installed
solar thermal system.
8.5.1 Parameters for the standard solar
thermal system
Menu: Solar sys parameters > 1. Standard
system > SP: ON temperature difference
For the solar circuit pump (SP):
B Set a higher value if the pipe runs between the
collector array and the solar cylinder are very
long (e.g. ≥ 30 m single length).
-or-
B Set a lower value:
– If the pipe runs between the collector array
and the solar cylinder are very short (e.g.
attic installations).
– If the thermal connection of the collector
temperature sensor (T
1
) is unfavourable
(e.g. installation of T
1
outside the collector
at the collector flow outlet).
Menu: Solar sys parameters > 1. Standard
system > SP: OFF temperature difference
B Same procedure as for the last menu point SP:
ON temperature difference.
Menu: Solar sys parameters > 1. Standard
system > T2: Max. solar cylinder temperature
Detailed description regarding T2: Max. solar
cylinder temperature Æ page 39.
Menu: Solar sys parameters > 1. Standard
system > Maximum collector temperature
Measuring point, temperature sensor (T
1
):
B Set a higher value if the installed pipe runs,
pumps etc. can operate with an operating
pressure ≥ 6 bar and are suitable for higher
temperatures.
-or-
B Set a lower value if the installed pipe runs,
pumps etc. can only operate with a very low
operating pressure and are only suitable for
lower temperatures.
Fill and vent the solar thermal
system according to its
documentation and prepare it for
commissioning as described this
chapter.
Details shown in brackets are
positions that are also used in the
connection diagrams with system
examples in the installation
instructions of the ISM.
At temperatures above 140 °C and
system pressures < 4 bar, the heat
transfer fluid in the collector
evaporates. The solar circuit pump
remains blocked until the collector
has cooled to a temperature at
which there is no more vapour in the
solar circuit.