Vaillant auroTHERM VFK 145 H Installation Manual page 24

5 Flat roof fitting and installation
5.1.1.3 Transporting collectors
1. To protect the collectors against damage, always trans-
port them horizontally.
2. Transport the collectors to the roof using suitable aids.
5.1.2 Complying with clearances and installation
clearances
During storms, turbulence (swirling) causes strong wind
forces to occur along the edges of flat roofs.
▶
When defining the installation position, maintain an edge
clearance of at least 1 m from the roof edge.
5.1.3 Selecting suitable connection
▶ Select the appropriate connection for the collectors.
▶
For the hydraulic connection of the collectors, select one
of the four variants shown in the illustration.
▶ Ensure that the solar fluid always flows through the col-
lectors from the bottom to the top.
Conditions: Number of collectors: 1 ... 5
1 ...
▶
Configure the hydraulic connections on top of each other
on one side.
Conditions: Number of collectors: 6 ... 12
1 2
▶ To guarantee a complete flow through the collector field,
arrange the hydraulic connections diagonally.
24
4 5
...
12
11
Conditions: Number of collectors: ≥ 13
1 2
8 9
▶ Always connect as many collectors as possible in series.
▶ Set up several parallel collector rows.
▶ Connect the collector rows hydraulically in parallel.
▶ To avoid pressure losses in the sub-collector fields, only
use parallel connection for collector rows with the same
number of collectors.
▶ Ensure that each sub-collector field has the same total
pipe length in the flow and return (Tichelmann system), in
order to avoid pressure losses in the connection pipes.
5.1.4 Preparing the roof duct
Caution.
Lack of tightness due to destruction of the
roof skin.
In the event of destruction of the roof skin,
water may penetrate the building.
▶ Ensure adequate protection of the roof
skin during installation on roof sealing
surfaces.
▶ Place large-area building protection mats
underneath the installation system.
▶ After installation, check the tightness of
the building shell where there are directly
connected racks.
▶ Commission a roofer to prepare the roof duct.
Installation manual auroTHERM, auroTHERM plus 0020100571_03
...
7
6
...
14
13