DE DIETRICH NEO 2.1 - Manual (Page 61)

4.6 Hydraulic connections
4.6.1. Connection dimensions
Number of panels Size
(mm)
Maximum length
(Outlet + Return)
2 14-15 40 m
3 14-15 40 m
4 16-18 40 m
5 16-18 40 m
To be able to have pipework without degassers or bleed valves at
high points, the solar fluid flow rate must not fall below 0,4 m/s during
the degassing procedure.
The pipes must be as short as possible and always sloping
downwards between the collectors and the connection to the solar
tank.
If the installation criteria for good degassing cannot be met, a manual
bleed degasser R must always be installed at the high point(s) of the
solar equipment.
A Ideal
Z Incorrect (high point with no air vent)
E Correct (high point with air vent)
R Location of manual bleed valve degasser
4.6.2. Connecting
CAUTION
Soft soldering are not authorized.
The use of flux promotes corrosion conditions in systems
operating with propylene glycol as heat transfer fluid. In all
cases the inside of the pipes must be flushed.
4
Use of a hacksaw is prohibited.
4
Pipe connections by compression unions.
4
Hard soldering: Hard soldering: hard soldering filler metal without
flux in accordance with DIN EN 1044, e.g. L-Ag2P or L-CuP6.
4
Pipe unions: can only be used if they are resistant to glycol,
pressure (6 bar) depending on version) and temperature (-30 °C,
180 °C) (manufacturer's data).
4
Sealing material: Hemp.
4
Press fitting (6 bar, 140 °C).
1 2 3
4
M001755-A
M001756-A
NEO 2.1 / SUN 211 4. Installation
30/11/2011 - 300021356-001-F 60