43
4.2.2
Plate heat exchanger, 2 storage tanks
If, in the 'System
selection’'
menu, the points "Plate
heat exchanger", "2
storage tanks" and
"Basic" are selected, the
hydraulic diagram
illustrated here is
available for use as a
basic system (basic) with
the indicated variants.
•
"Basic" diagram: The regulator constantly records the differential temperature between the sensors
T1 and T2 or T1 and T3. If the set switch-on differential temperature (parameter: 'diff. temp. solar
ON') is reached, the solar circuit pump R2 switches on and heats the solar circuit with the plate
heat exchanger. The R2 speed control regulates the temperature of the solar flow (advance) (T1)
to the "Required loading temp." value + 5 Kelvin. If the temperature level on the plate heat
exchanger T4 reaches a value of at least 5 Kelvin more than the 'lower part of the storage tank'
temperature T2 or T3 and if T4 is at least 3K above the parameter value “AH extern. threshold “ in
case the charging requirements are met for storage tank 1 (charging below this value could
otherwise lead to the unintentional activation of any installed after-heating), R1 switches on with
minimum speed and then regulates the temperature of the charging current at the corresponding
preset value (parameter: 'Required loading temp. x'). This happens until either the maximum
storing temperature (parameter: ''storage tank x max.') is reached or the differential temperature
between T4 and T2 or between T4 and T3 fall below a value of 3 Kelvin. The solar circuit pump R2
remains active until either the maximum storing temperature (parameter: ''storage tank x max.') is
reached or falls below the switch-off differential temperature of the solar circuit (parameter: 'diff.
temp. solar OFF'). To protect the charging circuit from overheating, the solar circuit is deactivated
when T4 is only 3 Kelvin below the maximum charging temperature (parameter: 'Max. charging
temp. x'). If the charging circuit continues to heat up because of an erroneous function, R1 is also
deactivated when the maximum charging temperature is reached.
Definition: Storage tank 1 is charged when the 3-way valve R3 is in a de-energized state!
The additional functions shown (charging zones and after-heating) are not activated.
Warning: The parameter value “AH extern. threshold” is factory set to 0°C. This corresponds with
the setting when no external after-heating is connected. If an external after-heating (e.g. heating
cartridge) must be installed in your system, the parameter “AH extern. threshold” must be set
accordingly.
•
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.
•
Add-on
"
- CZ": R4 and T5 enable a charging zone control to be created for charging in 2 thermal
layers. 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 reason, a S7 radiation sensor must be installed in the collector level. For
control purposes T1 must be inserted between the collector and bypass. A detailed functional
description of this add-on can be found on page 15.
M
R4
or S7 (radiation sensor) for Basic-R
R4
oil,
gas
Basic-AH
T6
M
R3
T5
if so with
externar
after-heating
Basic
-CZ
