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Special functions
A simple heat metering function for basic system control can be activated in this menu.
Additional settings regarding the glycol, the percentage of gylcol and the ow rate of
the system are required. A correction value for the heat metering is also possible by
adjusting the “Offset ΔT”.
Since the calculation of the heat metering is based on the temperature of the collec-
tor and storage where measuring takes place, a possible deviation from the ow and
return temperature can be compensated with this value. Example: Displayed collector
temp. 40° C, measured ow temp. 39° C, displayed storage temp. 30° C, measured
return temp. 31° C means a setting of -20% (Displayed ΔT 10K, actual ΔT 8K => -20%
correction value)
Heat metering: Settings range: On/off /default setting: Off
AF type- Settings range: Ethylene/Propylene /default setting: Ethylene
Glycol portion -Settings range: 0-60% /default setting: 40%
Flow rate - Settings range: 10-5000 l/h /default setting: 500 l/h
Offset T - Settings range: -50% to +50% /default settings: 0%
8.6 Heat quantity
Caution
Keep in mind that the system is not changed, adjustments made in this
menu are only used to calculate the heat volume and should be based
on the actual system. Resulting data is only approximate value for func-
tion control!
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 inaccurately 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 speci 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
8.7 Start aid function
Caution
This function should only be activated by a specialist if problems arise
with acquisition of measurement values. In particular follow the instruc-
tions from the collector manufacturer.
48


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