Vaillant auroTHERM VFK 145/2 H Installation Manual page 10

4 Interconnection scheme
1
7
13
Fig. 4.5 Sizes of the individual rows (shown here: VFK 145/2V / 155V)
10
...
2
5
...
8
11
...
14
17
b
6
12
18
b
The flat collector rows that are connected in
parallel must be flushed and bled separately.
> To this end, open each stop valve in turn a
little at a time while the others remain
closed.
> Open all the stop valves after you have
flushed and bled all the rows.
> Then flush and bleed all the collector
arrays together. Only in this way can it be
ensured that no air remains in the collec-
tor arrays.
Caution!
Danger of air bubbles if venting
is inadequate!
With 3 or more collector rows con-
nected in parallel, the following
applies: If you do not provide extra
bleeding of the individual rows
during start-up, air bubbles can
occur. To bleed the individual rows,
additional stop valves are required.
> Install a stop valve in the collec-
tor flow line ("hot side") of each
individual row.
> Use only stop valves that have
been approved for installation in
solar heating systems.
> Bleed the collector array
according to the following
instructions.
Caution!
Danger of material damage as a
result of incorrect fitting!
If the stop valve is closed or incor-
rectly installed, the flat collector
can be damaged by overpressure.
> Never fit the stop valve in the
collector return line.
> Make sure that the stop valves
are open while the system is
operating.
Installation manual auroTHERM 0020100606_02