51
4.3
Systems for Supplementary Heating
4.3.1
Supplementary Heating with reverse raising, 1 combi storage tank,
internal heat exchanger
If, in the 'System
selection’'
menu, the points
"Supplementary Heating",
"1 combi tank" and
"int. heat exchanger" 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
for the switch-on differential temperature (parameter: 'diff. temp. solar ON'), the pump R1 is
switched on. If the storage tank reaches its maximum storing temperature (parameter: 'storage
max.') or falls below the switch-off differential temperature (parameter: 'diff. temp. solar OFF'), the
pump switches off. Depending on the setting (parameter -> speed control -> R1), 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 parameter 'diff. temp. solar ON' or the absolute temperature of
the 'collector' (T1) constant at a fixed temperature of 70°C.
Supplementary heating is provided using the 3-way valve R3 and the sensors T3 and T4. If the
differential temperature between T3 and T4 reaches the set value (parameter: 'Ret. flow incr. ON')
the 3-way valve guides the heating return flow above the storage tank. The valve remains in this
position until the differential temperature falls below the switch-off value (parameter: 'Ret. flow incr.
OFF') again.
Definition: Storage tank is not flown through when the 3-way valve R3 is in a de-energized
state (no return flow increase)!
The additional function shown (after-heating) is not activated.
•
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.
•
"Basic - R" diagram: In some cases the solar circuit pump must be controlled according to the
solar radiation. For this purpose a radiation sensor S6 must be installed in the collector level. For
control reasons T1 must be inserted between the collector and storage tank. 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
Basic-AH
T1
or S6 (radiation sensor) for Basic-R
T5
