46
EN
2.7
Assembly
2.7.1
Solar heating collectors
For year-round use, in Italy we tilt the frame by 35° (for exam-
ple: residential buildings).
The collectors should be kept covered until the system is start-
ed up so as to avoid damaging the insulation due to potentially
high temperatures (up to 200°C) and during extended system
shutdowns.
To cover the solar panels, we recommend using the cardboard
used to package the collectors or, alternatively, shade cloths
used for vegetable gardens.
When tightening the couplings to the solar collector, lock the
square elements of the fittings with a spanner (or pliers) to ap-
ply force in the opposite direction and thus prevent the end of
the panel’s tube bundle from twisting.
a
WARNING
Breaking of the tube bundle due to twisting is not cov-
ered by the warranty.
We suggest letting water flow (from top to bottom) inside the
collectors and heat exchangers of the calorifiers before install-
ing them, so as to clean out any processing residues.
2.7.2
Joints, couplings
To ensure tightness of the primary circuit threads, especial-
ly those situated outdoors, we recommend using anaerobic
sealant capable of withstanding temperatures above 150°C or
hemp (for mechanical tightness) combined with high-density
Teflon for steam (for hydraulic tightness).
The copper pipes of the primary circuit must be jointed through
brazing or using brass mechanical couplings with metal cone
gasket. Avoid using couplings with O-ring, as this material
could get damaged with high temperatures (unless special
O-rings for solar heating systems are used).
Stainless steel pipe joints must be made through flaring with
couplings and seals for high temperatures supplied in the rel-
evant kit.
Use bronze or brass couplings in contact with the panel, so as
to avoid corrosion problems due to galvanic currents.
Example of installation of couplings for connecting solar col-
lectors. Always refer to the instructions appearing in the sys-
tem diagram enclosed with the ordered material to view how to
mount the couplings connecting the solar panels.
The cold water inlet on the solar connectors must be at the
BOTTOM right or at the BOTTOM left-hand side of the collector
battery; the hot water outlet must be at the TOP on the opposite
side; in other words, if the fluid enters from the bottom left-
hand side it must leave from the top right-hand side and vice
versa.
2.7.3
Insulation piping
The pipes connecting the collector with the solar adjustment
unit or the calorifier must be made of copper or stainless steel.
d
FORBIDDEN
The pipes must never be made of galvanised steel due
to problems relating to galvanic currents and incom-
patibility with the heat-transfer fluid, and must never
be multi-layered as the high temperatures generated
could cause problems.
All pipes of the primary circuit must be properly insulated to
limit heat dispersion to the maximum. The pipe sections near
the solar collector must be insulated with material capable of
withstanding temperatures approaching 150°C.
The connecting pipes can be made of stainless steel or cop-
per. If they are made of copper, we suggest brazing them with
strong materials (Castolin, silver alloy, etc.) so that they can
withstand high temperatures.
For copper pipes of domestic systems, we suggest insulating
them using expanded elastomer specifically designed for so-
lar systems, with minimum 19 mm thickness (nonetheless as
specified in the applicable regulations) resistant to atmospher-
ic agents and lined on-site with adhesive aluminium tape along
the section exposed to weathering; for medium-large systems,
we recommend using 40 mm-thick rock wool insulation (none-
theless as specified in the applicable regulations) lined with
aluminium sheet along the section exposed to weathering and
PVC for the part situated inside the building.
Pipes of solar collectors up to the connection with the solar unit
and then with the heat exchanger must always be descending;
in no point must they bend upwards, so as to prevent backflow
air which could hinder the system’s operation.
COLD WATER
INLET
HOT WATER
OUTLET
HOT WATER
OUTLET
HOT WATER
OUTLET
COLD WATER
INLET
HOT WATER
OUTLET
COLD WATER
INLET
COLD WATER
INLET
Fig. 19
