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PWTd
T W V d
PS1
13.1.8. Plate heat exchanger decentralised PWTd option
Charging a consumer via a decentralised plate heat exchanger (08-102).
The type of charging must be defined on the consumer. When the PWTd pump
starts, it runs for 5s at 100% to overcome the break-loose torque.
This guarantees correct starting. When the solar pump is active, the pump
PWTd runs at the set minimum speed of rotation (08-024) until the charging
reference value on the TWVd sensor is reached. The controller now attempts to
maintain the charging reference value on TWVd by controlling the speed of
rotation. The charging reference value depends on the selected charging
strategy, yield or reference value, as well as the combination of the two. If the
temperature difference TKOx to TxU is less than the increase off, the pumps
switch off.
Charging on increase: charging reference value = consumer charging increase (08-064)
Charging on target: charging reference value = consumer optimised charging increase,
Input
01-014 Collector reference temperature
00-121 Temperature plate heat exchanger TPV
Parameter
08-102 Option external, decentralised plate heat exchanger
08-024 Minimum speed secondary pump PWV
Output
Manipulated variable y pump plate heat exchanger PWV
13.1.9. Menu: Solar storage tank - PWTDZ (plate heat exchanger decentralised option)
Parameters
Designation
Value Min.
Max.
Comments
R
W
08-102
PWTd heat
exchanger
decentral option
0
0
1
Option decentralised, external heat exchanger.
This option makes it possible to define charging via
an external heat exchanger for the particular
consumer. If it is active, a heat exchanger sensor
and a secondary pump must be installed. Speed
control of the secondary pump attempts to maintain
the minimum excess (08-064) at the heat exchanger
sensor. The secondary pump starts with the solar
pump if this is active for the consumer, the start
takes place with 100% for 3 sec., then speed control
is enabled immediately.
0 = Off
1 = Charging via decentralised external heat
exchanger
2 = Charging swimming pool via decentralised
external heat exchanger (without sensor TPV and
speed of rotation fixed 100%)
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30-008
Alloc. TWVd WT
decentral temp.
input
0=OFF
Allocation of input (VE1, VE2, VE3/IMP,
VE1/FE-1, etc.)
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