Operation manual of solar controller SR1568
Page 71 of 87
The heat quantity measurement can be carried out in 2 different ways:
Fixed flow rate ( with flow meter)
With Granados flow rotor VFS.
Heat quantity measurement with fixed flow rate value
The heat quantity measurement calculation (estimation) uses the difference between the
flow T1 and return T6 temperatures and the entered flow rate (at 100 % pump speed).
Note: sensor of flow and return pipe for heat quantity measurement is default set in
every system, it can not be set.
Under menu FTYPE to set the flow rate type Î
Read the flow rate (l/min) and adjust it in the FMAX menu
Adjust the antifreeze type and concentration of the heat transfer fluid under menu MEDT and
MED%.
Antifreeze type:
0: Water
1: Propylene glycol
2: Ethylene glycol
3: Typhoo? LS / G-LS
Note: Heat quantity measurement is not possible in systems with 2 solar pumps
Heat quantity measurement with Grundfos Direct SensorTM VFS:
The heat quantity measurement uses the difference between flow T6 and return TVFS
temperature and the flow rate transmitted by the VFS sensor.
TVFS: Grundfos Direct sensor VFS
Note:
Sensor of flow and return pipe for heat quantity measurement is default set in every
system, it can not be set.
Flow checking function is only available when a VFS type Grundfos Direct Sensor is
connected to the system.
If select Grundfos sensor VFS to calculate heat quantity, firstly you should activate
VFS function under menu GFDS, and select measurement range, default value is
1-12L/min.
Under menu FTYPE to set flow rate type VFS and measurement rang, default is 1-12L/min
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