Instruction of SR81 Split Pressurized Solar Hot Water System
Page 47 of 59
sensor VFS.
TVFS
：
temperature of Grundfos flow sensor VFS
Note
：
1. Sensors on the flow and return pipe for thermal energy measuring are defaulted, not
available for set.
2. Flow detecting function is available only when VFS
Grundfos direct sensor is connected to the system.
3. In order to activate VFS Grundfos sensor to measure the
thermal energy, firstly, under FS/GFDS menu to activate
VFS (VFS ON), and select a measuring range (default
measuring range is 1-12L/min)
4. Under FTYP menu to set flow rate type 2 (VFS)
Under menu MEDT and MED% to set the anti-frozen type and concentration of fluid medium
T6: temperature on flow pipe
TVFS
：
temperature on return pipe
If VFS is not connected, will blinks on the screen.
Thermal energy measuring with rotated flow sensor FRT
Under FTYP menu to set flow rate type 3 (FRT)
Controller calculates thermal energy used parameters value
from sensor T6 on flow pipe, sensor T5 on the return pipe and
flow rate which send to controller from flow sensor FRT.
Under menu MEDT and MED% to set the anti-frozen type and
concentration of fluid medium
Note
：
1. Sensors on the flow and return pipe for thermal energy measuring are defaulted, not
available for set.
2. Flow detecting function is available only when FRT sensor is connected to the system.
3. Under FTYP menu to set flow rate type 3 (FRT)
4. In order to activate FRT sensor to measure the thermal energy, firstly, under FS/FRT menu
to activate FRT (FRT ON)
