Operation manual of solar controller SR1568
Page 62 of 87
then system is switched to load the subordinate tank. This function is suitable for 2 tanks’
system.
OSE Spread loading option
In systems with 2 pumps, a spread loading function OSE can be activated, as soon as the
adjustable spread temperature difference DTSE between the collector and the priority tank is
reached, the second tank will be loaded in parallel unless it is blocked. If the spread
temperature difference falls below DTSE, the pump is switched off. The collector
temperature has to be higher than the tank temperature.
PDELR Pump delay running
Considering the trigger-on time of the electromagnetic valve this function delays the start of
the pump, if this function is activated, corresponding valve relay is triggered firstly, and pump
is delayed to start in 20 seconds.
Successive loading (Successive 1 and Successive 2)
Successive loading means that the priority tank will be loaded up to its maximum
temperature. If it is reached, the second tank just will be loaded. If the temperature of the first
tank falls below the tank set temperature, the second tank will no longer be loaded,
regardless of whether the switch-on conditions of the priority tank or of the subordinate tank
are fulfilled or not.
If both tanks have been loaded to their set temperature, the same process described above
will take place until the tanks have reached their maximum temperature.
Parallel loading option
In 2 tanks systems with 2 pumps, if a parallel loading function is set, then 2 tanks can be
loaded simultaneously; in systems with 3-ways valves, tank which temperature is lower is
loaded firstly until its temperature is 5K higher than the others. Then the other tank can be
loaded. 2 tanks are loaded alternately by 5K temperature difference.
COOL cooling function
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