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Information regarding design and operation
Installation information for solar lines
■ Use stainless steel pipe or commercially available copper pipe and
bronze fittings.
■ Metal seals (conical or locking rings and compression fittings) are
suitable for solar lines. If other seals such as flat gaskets are used,
adequate glycol, pressure and temperature stability must be guar-
anteed by the manufacturer.
■ Never use:
12
– Teflon (inadequate glycol stability)
– Hemp connections (not sufficiently gas-tight)
■ Generally, copper lines in solar circuits are hard soldered or joined
by press fittings. Soft solder could be weakened, particularly near
the collectors, due to the max. temperatures that may occur there.
Metal seal connections, locking ring fittings or Viessmann plug-in
connections with double O-rings are the most suitable.
■ All components to be used must be resistant to the heat transfer
medium.
Note
Fill solar thermal systems only with Viessmann "Tyfocor LS" heat
transfer medium.
VIESMANN
114
(cont.)
■ Take high temperature differentials in the solar circuit into consider-
ation when routing and securing pipes.
At pipe sections that may be subject to steam loads, temperature
differentials of up to 200 K can be expected, otherwise 120 K can be
expected.
18
16
14
12
10
8
6
4
2
0
0
50
Temperature differential in K
A 5 m pipe length
B 3 m pipe length
C 1 m pipe length
■ Route the solar connecting pipes through a suitable roof outlet (ven-
tilation tile).
A
B
C
100
150
200
VITOSOL
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