37
4.1.7
Internal heat exchanger, 4 storage tanks, 1 collector array
4.1.7.1
Internal heat exchanger, 4 storage tanks, 1 collector array, valve control
If, in the 'System selection'
menu, the points
"intern. heat exchanger",
"4 storage tank",
"1 collector" 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 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 by one of the differential temperatures,
the pump R1 switches on and the 3-way valves R2, 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 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 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 charged.
Depending on the setting (parameter -> speed control -> R1), the 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.
Definition: Storage tank 1 is charged when the 3-way valves (R2, R3, R4) are in a de-
energized state!
Storage tank 2 is charged when the 3-way valve R3 is in a de-energized state (R2
energized)!
Storage tank 3 is charged when the 3-way valve R4 is in a de-energized state
(R2, R3 energized)!
T1
