Operation manual of solar controller SR1568
Page 57 of 87
LOL (2)
CEM Collector emergency shutdown
When the collector temperature exceeds the adjusted collector emergency temperature,
Then solar pump (R1 / R2) switches off in order to protect the system components against
overheating (collector emergency shutdown). If the maximum collector temperature is
exceeded, Emerg is displayed.
Note: In systems with east- / west collectors, 2 separate menus (COL and COL 2) will
be displayed.
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. Do not set the collector limit
temperature higher than 95 °C.
OCCO Collector cooling
The collector cooling function keeps the collector rise temperature within the operating range
by heating the tank. If the tank temperature reaches 95 °C the function will switch off for
safety reasons.
When the tank temperature exceeds the adjusted maximum tank temperature, then solar
system switches off. If the collector temperature increases to its adjusted maximum collector
temperature, the solar pump is switched on until the collector temperature falls below the
maximum collector temperature. The tank temperature may then exceed its maximum
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