33
4.1.6
Internal heat exchanger, 3 storage tanks, 2 collector arrays
4.1.6.1
Internal heat exchanger, 3 storage tanks, 2 collector arrays, valve control
If, in the 'System
selection' menu, the
points
"intern. heat exchanger",
"3 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, T4 or T5.
Depending on which
collector array and which storage tank first reaches the switch-on differential temperature
(parameter: 'diff. temp. solar ON'), the pump R1 switches on and the 3-way valves R2, R3 and R4
are switched so that the corresponding collector array and the corresponding storage tank can be
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 x OFF'). Then, if the switch-on requirement 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 the storage tanks are charged, the option of switching to the other collector array is
constantly checked. A requirement for this switch is that the temperature of the passive collector
array must be an adjustable value (parameter: 'switch collect.') higher than that of the active array.
The storage tank is charged regardless of which collector array is active until the value of the
maximum storing temperature (parameter: 'storage tank x 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
(R2, R3, R4) are in a de-energized state! When the 3-way valve R4 is in a de-energized state
(R3 energized) storage tank 2 is charged!
Depending on the setting (parameter -> speed control -> R1), the solar pump’s speed 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, T4 or T5) 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.
R1
T1
T3
storage
tank 1
collector
field 1
collector
field 2
R2
R3
T4
T5
R4
M
M
T2
M
storage
tank 2
storage
tank 3
