Operation manual of solar controller SR1568
Page 61 of 87
Priority logic
Priority logic can be used in 2-tanks systems or systems with tank loading in layers only; it
determines how the heat is divided between the tanks. Several different priority logic types
can be selected:
Tanks loading sequence (sequence 1 and sequence 2)
Successive loading (successive 1 and successive 2)
Parallel loading
Tanks heated sequence
If the priority tank is not loaded because its switch-on condition is not reached, then the
subordinate tank is checked whether its switch-on condition is reached, if yes, then it is
loaded within a circulation runtime (tRun). After this, its loading process is stopped and the
controller monitors the increase in collector temperature during the loading break time, if the
collector temperature increases by 2K, then break time timer starts again to ensure collector
to receive more solar energy, if within the break time, collector temperature is not increased
sufficiently, then the subordinate tank will be loaded again for the circulation runtime.
As soon as the priority tank meets its switch-on condition, controller triggers to heat it
immediately, if the priority tank’s switch-on condition is still not reached, controller heats the
subordinate tank continuously. If the priority tank reaches to its preset temperature, and then
tank heated sequence function will not be curried out.
In systems with 2 tanks or tank loading in layers, all tanks or zones will be heated to its
preset temperature firstly (according to the priority and sequence control logic). Only when all
tanks or zones have exceeded its preset temperature, they just can be heated to theirs
maximum temperature continuously, and it is also heated according to the priority and
sequence control logic.
If the tank sequence heating function is activated and system is switched to heat the priority
tank, then parameter “heating break time” can also act as stabilization time, during which the
switch - off temperature difference will be ignored while the system operation stabilizes.
OSTS Tank set option
If the set priority tank reaches its set temperature, then subordinate tank will be heated until
to its set temperature. After this, priority tank can be loaded to its maximum temperature, and
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