Instruction of SR81 Split Pressurized Solar Hot Water System
Page 46 of 59
►Press “SET”, “OFF” blinks
►Press “+/-”, to activate this function, “OPAR ON” displays
►Press “SET” or “ESC” to save the setting
►Press “+”, “INVE OFF” displays
►Press “SET”, “OFF” blinks
►Press “+/-”, to activate this function, “INVE ON" appears on the screen
►Press “SET” or “ESC” to save the setting
8.11 OHQM Thermal energy measuring
Three thermal energy measuring methods are designed in this controller, you can select one
to measure the thermal energy produced by the solar system.
1: Fixed value of flow (glass tube flow meter)
2: Grundfos flow sensor VFS
3: Rotated flow meter FRT
Thermal energy measuring with fixed value of flow (estimated measuring)
Controller calculates thermal energy used parameters value from sensor T6 on flow pipe,
sensor T5 on the return pipe and enters a flow rate which get from fixed flow meter at pump
speed of 100%.
Note: sensors on the flow and return pipe for thermal energy measuring are defaulted,
not available for set.
Under FTYP menu to set flow meter type 1
Read flow rate (L/min) from flow meter and enter this value under menu FMAX.
Under menu MEDT and MED% to set the anti-frozen type and concentration of fluid
medium
Anti-frozen type (MEDT):
0: Water
1: Propylene glycol
2: Glycol
3: Tyfocol LS/G-LS
Thermal energy measuring with Grundfos flow sensor VFS
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 Grundfos flow
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