Installation and Operating Instructions
SDC 204 1316BED035-10B-E Date 12/06
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9
C
ONTROLLER FUNCTIONS
The Solareg Vision Plus controllers include
comprehensive functions for controlling and
monitoring the solar thermal system. A
basic distinction is made between:
• Control functions for loading the storage
cylinder
• Functions for system protection and
system monitoring
• Additional functions
9.1 General control functions
The control unit records the temperatures
from the various measuring points and
calculates the correct time to load the
storage cylinders, based on the
programmed (additional) functions and
control parameters. To prevent the pump
from switching on and off due to only
minimal differences in temperature, a
switch-on hysteresis, e.g. 7K and switch-off
hysteresis, e.g. 3K is preset.
9.1.1 Load storage cylinder
Relevant values in menu
“Basic setting” “Program”
--- Maximum temperature
--- Td start
Switch-on temperature difference
--- Td stop
Switch-off temperature difference
The storage cylinder is loaded to the
specified maximum temperature via the
pump on output A1, provided the collector
temperature is a certain amount higher than
that of the storage cylinder temperature.
The switching behavior can be set via Td
start and Td stop, whereby the value for Td
start cannot be lower than that for Td stop +
1. To prevent the pump from switching on
and off due to only minimal differences in
temperature, a hysteresis of 5K is preset as
the storage cylinder maximum temperature.
Load cylinder
(base of cylinder)
max
65 °C
T[°C]
(A1)
A1
On
Off
TColl
TSp
dT start
dT stop
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