23
4.1.3.2
Internal heat exchanger, 2 storage tanks, 1 collector array, pump control
If, in the 'System
selection' menu,
the points
"intern. heat exchanger",
"2 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" system: The regulator constantly records the differential temperature between the
sensors T1 and T2 or T1 and T3. If the set switch-on differential temperature (parameter: 'diff.
temp. solar ON') is reached by one of the differential temperatures, either solar circuit pump R1 is
switched on for storage tank 1 or solar circuit pump R2 for storage tank 2. 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 it falls below the switch-off differential temperature
(parameter: 'diff. temp. solar OFF'). Then, if the switch-on condition of the second storage tank is
met, the corresponding solar circuit pump is switched on. 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, it will be charged again.
Depending on the setting (parameter -> Speed control -> R1 and -> R2), the solar pump’s speed
control maintains the differential temperature between 'collector' (T1) and 'lower part of the storage
tank' (T2 or T3) 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.
The additional functions shown (circulation and after-heating) are not activated.
•
Add-on
"
- Ci": Output R3 and the T4 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.
•
Add-on
"
- AH": R4 and T5 combined with an oil or gas boiler can provide after-heating. A detailed
functional description of this add-on can be found on page 15.
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.
R4
T5
oil,
gas
Basic
-AH
T4
R3
Basic
-Ci
T1
