Instruction of SR81 Split Pressurized Solar Hot Water System
Page 27 of 59
Warning
! Risk of injury! Risk of system damage by pressure surge! If water is used as
the heat transfer fluid in pressure systems, water will boil at 100 °C. Then do not set the
collector limit temperature higher than 95 °C.
OCCO Collector cooling
The collector cooling function keeps the collector temperature rising within the operating
range by heating the tank. If the tank temperature reaches 95°C the function will be switched
off for safety reason.
When the tank temperature exceeds the adjusted maximum temperature of tank, then solar
system is switched off. If the collector temperature rises up to its adjusted maximum collector
temperature, the solar pump is switched on again until the collector temperature falls below
the maximum collector temperature. The tank temperature may then exceed its maximum
temperature, but only up to 95°C (emergency shutdown of the tank), and sign blinks on
the screen, system stops.
If the collector cooling is active, blinks on the screen.
Note:
This function is only available when the heat transfer function (OHDP) is not
activated.
OCMI Collector minimum temperature
The minimum collector temperature is the lowest temperature of collector, only when
collector temperature is higher than that temperature, solar pump (R1) just can be
switched-on, if the collector temperature falls below the adjusted minimum temperature,
Sign blinks on the screen (slowly blinks).
OCFR Collector antifreeze function
Collector antifreeze function activates the loading circuit between the collector and the tank
when the collector temperature falls below the adjusted temperature
CFRO
. This will protect
the fluid against freezing or coagulating. If collector temperature exceeds the switch-off
temperature of collector antifreeze function CFRF, the solar pump will be switched off again.
If collector antifreeze function is activated, sign blinks on the screen.
Note:
Since this function uses the limited heat which is saved in the tank, so the
antifreeze function should be used only in regions where the ambient temperature is
