Grant Solar GS222020X - Heat Quantity; Constant Flow

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Special functions
Special functions
6.9. - Heat quantity
6.9.1. - Constant fl ow
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 ΔT 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
ΔT 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 ΔT 10K, real ΔT 8K =
-20% correction)
Caution
The heat quantity measured in the mode “Flow rate” is a calculated approximation for
function control of the system.
6.9.1.1. - Flow sensor (X)
This determines the sensor that is used to measure the  ow temperature.
Settings range: S1-S8, VFS1-2, active collector, active storage/ Default setting: S1
6.9.1.2. - Return sensor
This determines the sensor that is used to measure the return temperature.
Settings range: S1-S8, VFS1-2, Aktiver Collector, Active storage/ Default setting: S2
6.9.1.3. - Anti freeze type
Set the type of anti freeze used. If none is used, please set to 0.
Settings range: Ethylen, Propylen / Default setting: Propylen
6.9.1.4. - Glycole percentage
The amount of anti freeze agent in the system.
Settings range: 0-100% / Default setting: 45%
6.9.1.5. - Flow rate (X)
Flow rate that is used to calculate the heat quantity
This determines the  ow rate in litres per minute that is used for the calcualtion of the heat quantity.
Settings range: 0-100 l/min / Default setting: 5 l/min
6.9.1.6. - Offset ∆ T
Correction value for temperature difference
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 ΔT 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 ΔT 10K, real ΔT 8K =
-20% correction)
Settings range: -50 to +50% / Default setting: 0%