39
4.1.7.2
Internal heat exchanger, 4 storage tanks, 1 collector array, pump control
If, in the 'System selection'
menu, the points
"intern. heat exchanger",
"4 storage tank",
"1 collector" 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 temperature between the
sensors T1 and T2, T1 and T3, T1 and T4, or T1 and T5. If the set switch-on differential
temperature (parameter: 'diff. temp. solar ON') is reached, either solar circuit pump R1 is switched
on for storage tank 1, R2 for storage tank 2, R3 for storage tank 3 or R4 for storage tank 4. 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 OFF'). Then, if the switch-on condition of a storage tank with lower priority is met,
the corresponding solar circuit pump is switched on and the storage tank is charged until its switch-
off criteria ('storage tank y max.' or 'diff. temp. solar OFF') are met. This process continues up to
the lowest priority. When a secondary storage tank is being 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 charge.
Depending on the setting (parameter -> speed control -> R1, -> R2, -> R3 and -> R4), solar
pump’s speed control maintains the differential temperature between 'collector' (T1) and 'lower part
of the storage tank' (T2, T3, T4 or T5) at the value of the parameter 'diff. temp. solar ON' or the
absolute temperature of the 'collector' (T1) constant at a fixed temperature of 70°C.
To prevent erroneous settings, the described switch-on and switch-off values are interlocked,
this means they can be set only at a specific value to one another.
T1
