35
12.8 Start aid function
menus 7.8 / 7.8.1 - 7.8.3
With some solar systems, especially with vacuum tube collectors, it may occur
that the measurement value acquisition at the collector sensor occurs too slowly
or too inaccurately because the sensor is often not at the hottest location. When
the start help is activated the following sequence is carried out:
If the temperature at the collector sensor increases by the value speci
fi
ed under
“Increase” within one minute, then the solar pump is switched on for the set
“Purging time” so that the medium to be measured can be moved to the collector
sensor. If this still does not result in a normal switch-on condition, then the start
help function is subject to a 5-minute lockout time.
Start help setting range: on, off/default setting: off
Purging time setting range: 2 ... 30 sec./default setting: 5 sec.
Increase setting range: 1°C....10°C/default setting: 3°C/min.
Caution
This function should only be activated by a specialist if problems arise
with acquisition of measurement values. In particular follow the instruc-
tions from the collector manufacturer.
Special functions
menu 7
12
12
AF type
menu 7.7.2
Adjust the type of glycol that has been used in the system.
Settings range: Ethylene/Propylene /default setting: Ethylene
Glycol
portion
menu 7.7.3
Adjust the percentage of glycol that has been used in the system.
Settings range: 0-60% /default setting: 40%
Flow rate
menu 7.7.4
Adjust the
fl
ow rate according to the system.
Settings range: 10-5000 l/h /default setting: 500 l/h
∆
T
Offset
menu 7.7.5
Since the calculation of the heat metering is based on the temperature of the
collector and storage where measuring takes place, a possible deviation from
the
fl
ow and return temperature can be compensated with this value.
Example: Displayed collector temp. 40° C, measured
fl
ow temp. 39° C, displayed
storage temp. 30° C, measured return temp. 31° C means a setting of -20%
(Displayed
∆
T
10K, actual
∆
T
8K => -20% correction value)
Settings range: -50% to +50% /default settings: 0%
12.7 Heat quantity
(continued)
