
Manual of SR288 intelligent controller
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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.
This function is only available when the system cooling function (OSYC) and the heat
transfer function (OHDP) are not activated.
OCMI Collector minimum temperature
The minimum collector temperature is the lowest temperature for running the solar system,
only when collector temperature is higher than this temperature, solar pump (R1) just can be
switched-on, if the collector temperature falls below the adjusted minimum temperature, and
the function will be activated, sign blinks on the screen slowly.
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 slowly.
Note:
Since this function uses the limited heat which is saved in the tank, so the
antifreeze function should be used in regions where ambient temperatures is around
the freezing point only for a few days.
OTCO Tube collector function
This function is used for improving the switch-on behavior in systems with non-ideal sensor
positions (e. g. with some tube collectors).
This function operates within an adjusted time section. It activates the collector circuit pump
R1 for an adjustable runtime between adjustable pauses in order to compensate for the
delayed temperature measurement.
If the runtime is set to more than 10s, the pump will run at 100% for the first 10s of the
runtime. For the remaining runtime, the pump will run at the adjusted minimum speed.
If the collector sensor is defective or the collector is blocked, this function will be switched off.