Work station series for solar water heating control system
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. Product information
1. System description
The solar circulation pump (P1) is activated as soon as the temperature difference between the
collector array (T1) and the storage (T2) are reached. If the temperature difference between the
collector array (T1) and storage (T2) drops below the switch-off temperature difference, or the
storage (T3) reaches its maximum temperature, the solar pump (P1) will be switched off.
T3 is used to measure the temperature of the top part of storage. If the turning-on condition for
auxiliary heating is reached, the auxiliary heating will be activated.
1 collector array --- 1 storage
T1: Temperature sensor for collector array
T2: Temperature sensor in bottom part of storage
T3: Temperature sensor in top part of storage
P1: Solar circulation pump
P2: Solar circulation pump
Danger:
If there is only one temperature sensor in water storage (usually in bottom part T2), it is
possible that the auxiliary heating function will not be activated or deactivated at a right time,
because the water temperature in top part of the storage (T3) cannot be measured. In this case,
if you still want to use auxiliary heating function, control program will automatically take the signal
from bottom temperature sensor (T2) instead of T3. However, water in top part of storage might
often be overheated. It may cause damages to material and persons. So it is highly
recommended not to use auxiliary heating in such a case.
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