Hydraulic Diagrams; Solar Unit Program 0, 1 - Technische Alternative ESR 21 Manual Del Usario

Hydraulic diagrams

Solar thermal system - program 0
The solar pump A runs when S1 has a temperature of diff1 higher than S2 and S2 has not
exceeded the threshold max1.
In addition, the pump's protective function takes effect: During a standstill, steam can oc-
cur in the system. When automatically switched on again, the pump does not have the re-
quired pressure in the steam phase to lift the fluid level to the collector's supply line (highest
point in the system). This represents a considerable load on the pump. The collector's excess
temperature shut-down function can be used to block the pump whenever a certain tempera-
ture has been reached at the collector's sensor until a second threshold, which can also be
set, is fallen short of again. The settings ex works are 130°C for the blockage and 110°C for
the release. The settings can be changed in the menu MEN, sub-menu SYS PF/CET (collec-
tor excess temperature).
Program 1
With this program, the solar thermal system has an additional storage limit max2 via sen-
sor S3. There is no guarantee that the actual storage temperature will lead to a cut-off in
time, especially if the reference sensor S2 is installed at the return outlet for the heat ex-
changer.
especially if the reference sensor S2 is installed at the return outlet for the heat exchanger.
Note:
In both programs, the special system status "collector excess temperature reached" is
shown with a blinking Stat. Once Stat has been selected, CETOFF appears for the collec-
tor's excess temperature shut-down function.
Some countries only offer subsidies for the installation of solar thermal systems if the con-
trol units have a function check to detect a sensor defect and a lack of circulation. In the
menu command F CHCK, the mechanic can activate this function check for the ESR21. This
is possible for both programs and is disabled ex works. For details, see "system status".
The entire instruction manual with all schemes and programs can be downloaded
from: www.ta.co.at section DOWNLOADS
4
S1
S3
A
S2
= factory settings
S3 for program 1
Required settings :
S1
max1 ... limit TK S2
max2 ... see program 1
diff1
diff1 ... coll. S1 – TK S2
S2
max1