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7.8 Start help function (solar only)
With some solar systems, especially with vacuum tube collectors, it may occur that the
measurement value acquisition at the collector sensor occurs too slowly or too inac-
curately because the sensor is often not at the hottest location. When the start help is
activated the following sequence is carried out:
If the temperature at the collector sensor increases by the value specifi ed under
“Increase” within one minute, then the solar pump is switched on for the set “Purg-
ing time” so that the medium to be measured can be moved to the collector sensor. If
this still does not result in a normal switch-on condition, then the start help function is
subject to a 5-minute lockout time.
Start help setting range: on, off/default setting: off
Purging time setting range: 2 ... 30 sec./default setting: 5 sec.
Increase setting range: 1°C....10°C/default setting: 3°C/min.
Caution
This function should only be activated by a specialist if problems
arise with acquisition of measurement values. In particular follow
the instructions from the collector manufacturer.
Special functions
Caution
Resulting data is only approximate value for function control!
7.7.2 AF
type
Adjust the type of glycol that has been used in the system.
Settings range: Ethylene/Propylene /default setting: Ethylene
7.7.3 Glycol
portion
Adjust the percentage of glycol that has been used in the system.
Settings range: 0-60% /default setting: 40%
7.7.4 Flow
rate
Adjust the fl ow rate according to the system.
Settings range: 10-5000 l/h /default setting: 500 l/h
7.7.5
Δ
T Offset
Since the calculation of the heat metering is based on the temperature of
the collector and storage where measuring takes place, a possible deviation
from the fl ow and return temperature can be compensated with this value.
Example: Displayed collector temp. 40° C, measured fl ow temp. 39° C,
displayed storage temp. 30° C, measured return temp. 31° C means a
setting of -20% (Displayed
Δ
T 10K, actual
Δ
T 8K => -20% correction value)
Settings range: -50% to +50% /default settings: 0%
