25
4.1.4
Internal heat exchanger, 2 storage tanks, 2 collector arrays
4.1.4.1
Internal heat exchanger, 2 storage tanks, 2 collector arrays, valve control
If, in the 'System selection'
menu, the points
"intern. heat exchanger",
"2 storage tank",
"2 collectors" and
"Basic V" are selected, the
hydraulic diagram
illustrated here is available
for use as a basic system
with the indicated variants.
•
"Basic V" 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 tank first reaches the switch-on differential temperature (parameter: 'diff.
temp. solar ON'), pump R1 switches on and the 3-way valves R2 and R3 are switched so that the
corresponding collector array and the corresponding storage tank are flown through. 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 OFF'). Then, if the switch-on condition of the second storage tank is
met, the 3-way valve switches to this storage tank. When the following storage tank is charged, the
prioritized storage tank is checked, at regular intervals (“storage tank priority...” -> “Test interval”), if
the 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.
When the storage tank is charged the option of switching to the other collector array is constantly
checked. A condition for this switch is that the temperature of the passive collector array must be a
adjustable value (parameter: 'switch collect.') higher than that of the active array. The storage tank
is charged irrespective of which collector array is active until the value of the maximum storing
temperature (parameter: 'storage max.') is reached or falls below the switch-off differential -
temperature (parameter: 'diff. temp. solar OFF'). If this is the case, the solar circuit pump and the
switch valves are switched off.
Definition: Collector array 1 and storage tank 1 are flown through when the 3-way valves are in a
de-energized state!
Depending on the setting (parameter -> speed control -> R1), the solar pump’s peed control
maintains the differential temperature between the active 'collector' (T1 or T2) and the 'lower part of
the storage tank' temperature of the storage tank currently about to be charged (T3 or T4) at the
value of the parameter 'diff. temp. solar ON' or the absolute temperature of the 'collector' (T1 or T2)
constant at a fixed temperature of 70°C.
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
