35
4.1.6.2
Internal heat exchanger, 3 storage tanks, 2 collector arrays, pump control
If, in the 'System
selection' menu, the
points
"intern. heat exchanger",
"3 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, T4 or T5.
Depending on which
collector array and which storage tank 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 valves
R3 and R4 are 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 storage tank 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 a storage tank with lower priority is met,
the 3-way valves are switched to charge the corresponding storage tank. When a secondary
storage tank is charged it is checked at regular intervals (“storage tank priority...” -> “Test interval”)
whether a storage tank with higher priority can be charged again. For this purpose the solar circuit
pump is deactivated for a short period (“storage tank priority...” -> “Test period”). If a storage tank
with higher priority reaches its switch-on temperature within this period, this will be charged.
When a storage tank is being 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
also 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 all
storage tanks have reached their set maximum storing temperature, both solar circuit pumps and
the 3-way valves are switched off.
Note:
The parameters 'diff. temp. solar1 ON' and 'diff. temp. solar1 OFF' apply for all
storage tanks with regard to collector array 1.
The parameters 'diff. temp. solar2 ON' and 'diff. temp. solar2 OFF' apply for all
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 currently about
to be charged (T3, T4 or T5) 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 charged when the 3-way valves (R3, R4) are in a de-energized
state!
Storage tank 2 is charged when the 3-way valve R4 is in a de-energized state (R3 energized)!
R1
T1
T3
storage
tank 1
collector
field 1
collector
field 2
R2
R3
T4
storage
tank 2
T5
storage
tank 3
R4
M
M
T2
