41
4.2
Systems with Plate Heat Exchanger
4.2.1
Plate heat exchanger, 1 storage tank
If, in the 'System
selection’'
menu, the points "Plate
heat exchanger", "1
storage tank" 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. 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
"charging setpoint" value + 5 Kelvin. If the temperature level on the plate heat exchanger T3
reaches a value of at least 5 Kelvin more than the 'lower part of the storage tank' temperature T2
and if T3 is at least 3K above the parameter value “AH extern. threshold “ (charging below this
value could otherwise lead to the unintentional activation of any installed external after-heating), R1
switches on with minimum speed and then regulates the temperature of the charging current to the
preset value required (parameter: 'charging setpoint'). This happens as long as either the maximum
storing temperature (parameter: ''storage max.') is reached or the differential temperature between
T3 and T2 falls below a value of 3 Kelvin. The solar circuit pump R2 remains active until either the
maximum storing temperature (parameter: ''storage 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 if T3 is only 3Kelvin below the
maximum charging temperature (parameter: 'Max. charging temp.'). If the charging circuit
continues to heat up because of an erroneous function, R1 is also deactivated if the maximum
charging temperature is reached.
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 if 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 T4 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": R3 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 V - R" diagram: In some cases the solar circuit pump must be controlled according to the
solar radiation. For this reason, a S6 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
R3
or S6 (radiation sensor) for Basic-R
R4
oil,
gas
Basic-AH
T5
if so with
external
after-heating
T4
Basic
-CZ
