Instruction of SR81 Split Pressurized Solar Hot Water System
Page 29 of 48
coil); the purpose is to keep the collector’s or tank’s temperature within the operating range.
For this function, an extra output should be added (R2 or R3 as option)
Heat transferring by external radiator function can control either an additional pump or a
valve (OTPM ON = pump logic, OTPM OFF = valve logic).
Pump logic controlled thermal transferring function:
If the temperature (T1) of collector reaches the set point of switch-on temperature, pump
(R2/R3) will be triggered. If the temperature (T1) of collector drops below 5K to the over-heat
temperature, pump (R2/R3) will be ceased.
Valve logic controlled thermal transferring function:
If the temperature (T1) of collector reaches the set point of the switch-on temperature,
temperature difference circuit pump (R1) and valve (R2/R3) will be triggered simultaneously.
If the temperature (T1) of collector drops below 5K to the over-heat temperature, pump (R1)
and valve (R2/R3) will be ceased simultaneously.
Below is the example of this application for reference.
Collector valve logic heat transferring Collector pump logic heat transferring
Sign displays on the screen, it indicates that valve logic heat transferring is running.
Sign displays on the screen, it indicates that pump logic heat transferring is running.
Note:
1. When collector overheat temperature OTST is 10K below the CEM temperature of
collector emergency shutdown, then collector overheat temperature OTST is locked
2. Heat transferring function is only available when collector cooling function (OCCO) is
deactivated.
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