15
4.1
Systems with Internal Heat Exchanger
4.1.1
Internal heat exchanger, 1 storage tank, 1 collector array
If, in the 'System selection'
menu,
the points
"intern. heat exchanger",
"1 storage tank" and
"1 collector" are selected,
the hydraulic diagram
illustrated here is available
for use as a basic system
(basic) with the indicated
variants.
•
"Basic" diagram: As soon as the differential temperature between T1 and T2 reaches the set
value (parameter: 'diff. temp. solar ON'), the solar circuit pump R1 is activated. If the storage tank
reaches its maximum storing temperature (parameter: 'storage max.') or in the event it falls below
the switch-off differential temperature (parameter: 'diff. temp. solar OFF'), the pump switches off.
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) at the value of the 'diff. temp. solar ON' parameter or the absolute temperature of the
'collector' (T1) constant at a fixed temperature of 70°C.
The additional functions shown (circulation and the two after-heaters) are not activated.
•
Add-on
"
- Ci": Output R2 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 T3 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.
•
Add-on
"
- SFH": With the help of R3, T3 and T5 after-heating is also possible considering the
boiler temperature (required, for example, when burning solids). A detailed functional description
of this add-on works can be found on page 15.
•
"Basic - R" diagram: In some cases the solar circuit pump must be controlled according to the
solar radiation. For this purpose a radiation sensor S7 must be installed in the collector level. For
control reasons, T1 must be inserted between the collector and bypass. 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.
T2
R1
T4
R2
Basic-
Ci
T5
T3
R3
solid
fuel
Basic-
SFH
R4
T3
oil,
gas
Basic-
AH
or S7 (Radiation sensor for Basic-R)
M
R2
Bypass for
Basic-R
