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The primary circuit of the solar collectors must have at least a thermometer and a
manometer to permit recording of the temperature and the pressure of the circuit.
Before the final filling of the primary circuit, internal washing with domestic water
should be carried out to remove any dirt or rests and pressure test should be carried
out to verify the sealing of all, without exceeding the maximum pressure allowed by
solar collectors. This is to verify that the connections between solar collectors have
no leaks. If that is so, the fittings should be tightened, using two keys, so as to avoid
transmitting force (torsion) to the pipes of the absorbers of the solar collectors.
(Figure 22)
Figure 22
During the final filling of the solar system with antifreeze fluid it must be verified that
the circuit is perfectly purged and pressurized. Once this operation is finalized, the air
vents should be closed.
It should be avoided to carrying out operations such as washing and filling the
primary circuit while or after the solar collectors are exposed to intense sun.
8. Lightning Protection
National norms and regulations over lightning protection should be closely followed.
In any case the support(s) of the collectors must be "earthed" with copper wire of
2
16mm
to the ground grid of the building. This will serve as lightning protection.
This guideline does not release in any way the installer from his responsibility
against lightning protection requirements.
9. Permissible wind and snow load
Permissible negative pressure for wind load is 1500 Pa
Permissible positive pressure for snow load is 2000 Pa
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