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Special functions
One of the available heat meter modes can be selected here (Off, calculated heat
quantity by preset xed ow rate or more precise heat metering via VFS sensor). Ad-
ditional parameters like the type of glycol, and VFS type and position can be made.
The setting „VFS position“ determines the position of the two relevant temperature
sensors. If the position of the VFS is set to „Flow, it is assumed that sensor 4 is in-
stalled into the return.
Heat metering settings range: On, Off
VFS-Type- settings range: ( xed) ow rate, 12, 20, 40, 100, 200, 400 l/min / Default 20 l/min
AntiFreeze/Glycoltype - settings range: Ethylene,Propylene / Default: Ethylene
Glycolportion - settings range: 0...60% / Default: 40%
VFS-Position settings range: return, ow / Default: return
When the heat meter mode „Flow rate“ is selected, an approximated heat quantity is
calculated using the values the user has to enter. These are type of glycol/AntiFreeze,
glycol portion and ow rate. These values are put into correlation with the temperature
data of collector sensor and storage sensor. If necessary a correction value for T can
be set: Since for the heat meter the collector and the storage temperature are used,
a difference to the ow respectively return ow temperature can be compensated by
changing Offset T accordingly.
Example:
Displayed collector temp. 40°C, measured ow temperature 39°C, displayed storage
temperature 30°C, measured return temperature 31°C = results in a correction value of
-20% (displayed T 10K, real T 8K = -20% correction)
Flow rate - settings range: 10...5000 l/h / Default 500 l/h
Offset ΔT - settings range: -50% ... +50% / Default 0%
7.7. - Heat meter
Caution
The heat quantity measured in the mode “Flow rate” is a calculated approxima-
tion for function control of the system.
Caution
To prevent damage to the Vortex Flow Sensor it is strongly recommended
to install it into the return ow. If it is necessary to install in the ow, it is
imperative not to exceed the maximum temperatures of the sensor! (0° C to
100°C and -25°C to 120°C short term)
43


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