27
4.1.4.2
Internal heat exchanger, 2 storage tanks, 2 collector arrays, pump control
If, in the 'System selection'
menu, the points
"intern. heat exchanger",
"2 storage tank",
"2 collectors" and
"Basic P" are selected, the
hydraulic diagram
illustrated here is available
for use as a basic system
with the indicated variants.
•
"Basic P" diagram: The regulator constantly records the differential temperatures between the
collector sensors T1 or T2 and the storage tank sensors T3 or T4.
Depending on which collector
array and which storage first reaches the switch-on differential temperature (parameter: 'diff. temp.
solar1 ON' or 'diff. temp. solar2 ON'), either solar circuit pump R1 is switched on for collector array
1 or solar circuit pump R2 for collector array 2 and the 3-way valve R3 is switched so that the
corresponding storage tank is charged. If the storage tank currently about to be charged is the first
storage tank on the priority list (parameter -> storage tank priority...), this is charged until it reaches
its maximum storing temperature (parameter: 'storage tank x max.') or falls below the switch-off
differential temperature (parameter: 'diff. temp. solar x OFF'). Then, if the switch-on condition of the
second storage tank is met, the 3-way valve is switched to this storage tank. When the next
storage tank is charged, the prioritized storage tank is checked at regular intervals (“storage tank
priority...” -> “Test interval”), if it can be charged again. For this purpose the solar circuit pump is
deactivated for a short period (“storage tank priority...” -> “Test period”). If the prioritized storage
tank reaches its switch-on temperature within this period, this will be charged again.
When a storage tank is charged it is also checked if the switch-on differential temperature of the
passive collector array is reached. If this is the case, the pump of the passive solar circuit is
switched on. In the event of falling below the switch-off differential temperature (parameter: 'diff.
temp. solar1 OFF' or 'diff. temp. solar2 OFF') the corresponding pump is switched off. If both
storage tanks have reached their set maximum storing temperature (parameter: 'storage 1 max.' or
'storage 2 max.'), both solar circuit pumps and the 3-way valve are switched off.
Note:
The parameters 'diff. temp. solar1 ON' and 'diff. temp. solar1 OFF' apply for both
storage tanks with regard to collector array 1.
The parameters 'diff. temp. solar2 ON' and 'diff. temp. solar2 OFF' apply for both
storage tanks with regard to collector array 2.
Depending on the setting (parameter -> speed control -> R1 or R2), the speed control of the
individual solar pumps maintains the differential temperature between the corresponding 'collector'
(T1 or T2) and the 'lower part of the storage tank' temperature of the storage tank which is currently
about to be charged (T3 or T4) at the value of the parameter 'diff. temp. solar1 ON' or 'diff. temp.
solar2 ON' or the absolute temperature of the 'collector' (T1 or T2) constant at a fixed temperature
of 70°C.
Definition: Storage tank 1 is charge when the 3-way valve is in a de-energized state!
The additional functions shown (circulation and after-heating) are not activated.
•
Add-on
"
- Ci": Output R4 and the T5 temperature sensor can also provide a control of a circulation
pump for the warm water cycle. A detailed functional description of the add-on with further tips can
be found on page 14.
T3
R1
storage
tank 1
collector
field 1
collector
field 2
R2
storage
tank 2
R3
T4
T5
R4
Basic
-Ci
R4
T5
oil,
gas
Basic
-AH
T1
T2
