Instruction of SR81 Split Pressurized Solar Hot Water System
Page 28 of 48
OCFR (Antifreeze function) setup
►Select OCFR submenu, “OCFR” displays on the screen
►Press “SET”, “OCFR OFF” displays on the screen
►Press “SET”, “OFF” blinks on the screen
►Press “+/-”, to activate this function, “OCFR ON” displays on the screen
►Press “+”, “CFRO 4
o
C” displays on the screen
►Press “SET”, “4
o
C” blinks on the screen
►Press “+/-”, to adjust the switch-on temperature of antifreeze function
►Press “SET” or “ESC” to save the setting
►Press “+”, “CFRF 5
o
C” displays on the screen
►Press “SET”, “5
o
C” blinks on the screen
► Press “+/-”, to adjust the switch-off temperature of antifreeze function
►Press “SET” or “ESC” to save the setting
►Press “ESC” to return to previous menu
8.4 COOL Cooling function
Function description
2 cooling functions for different devices can be activated by this function: tank cooling, heat
transferring by external radiator
OSTC Tank cooling
When the tank cooling function is activated, the controller aims to cool down the tank during
the night in order to prepare it for solar loading on the following day. If the tank temperature
exceeds the adjusted maximum tank temperature SMAX, the collector temperature falls
below the tank temperature and downwards to the switch-on temperature difference DTCO
of this cooling function, then system will be activated in order to cool down the tank by
releasing the energy through the collector.
If tank cooling function is activated, sign blinks on the screen
Note: if tank temperature reaches to 95
o
C, all cooling functions will be locked.
Hysteresis switch on temperature difference is 5K.
OHDP Heat transferring by external radiator
Heat transferring by external radiator function is designed to transfer the excess heat which
is generated under the strong solar irradiation through an external heat exchanger (e. g. fan
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