27
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 specified
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 instructions 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 flow rate according to the system.
Settings range: 10-5000 l/h /default setting: 500 l/h
ΔΔΔΔΔ
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 flow and return temperature can be compensated with this value.
Example: Displayed collector temp. 40° C, measured flow temp. 39° C,
displayed storage temp. 30° C, measured return temp. 31° C means a
setting of -20% (Displayed
Δ
T
10K, actual
Δ
T
8K => -20% correction value)
Settings range: -50% to +50% /default settings: 0%
12.7 Heat quantity
(continued)
Summary of Contents for TDC 2
Page 35: ...35 Notes...
