THERMOSIPHONIC SOLAR WATER HEATERS / TECHNICAL DOCUMENTATION / PAGE 2
I. INTRODUCTION
SAFETY MEASURES
Always use certified installation tools and full protection devices.
In case you need to work near electrical wires, turn the electricity off.
Always wear protective goggles, protective boots, gloves and masks in compliance with the
respective safety regulations.
TRANSPORT & HANDLING
The tanks and the collectors come packed in expanded polystyrene frames and stretch films, where
they must remain during all transportation and storage. The collectors must be transported in vertical
position, in order to avoid any damage. During installation keep the collector covered until the closed
circuit is filled with thermal fluid.
LIGHTING PROTECTION
Connect the metal part of the collector with the lighting protection system, if available or otherwise
connect them to an earth rod. For further information consult a specialist.
Thermal effects due to lightning currents are considered negligible (Annex E, paragraph E 5.10
standard EN 12976-2).
The mechanical loads on the components of the solar system due to lightning charges are too low and
the effect on durability and stability is considered negligible (Annex E, paragraph E 5.11 standard EN
12976-2).
The solar thermal system can be connected to the existing lightning protection at the roof of a
building, in order to be protected against any form of damage due to lightning. Additionally, please
note that the solar system is a natural circulation system and its electrical resistance is fed from the
main building switchboard, provided that there is always possibility of connecting the electrical
resistance of the storage tank to the building’s central earth. The electrical resistance is tested
according to standards EN 60335-1 and EN 60335-2-21.
THERMAL FLUID
Nox fluid is a propylene glycol based thermal fluid, non toxic to the skin. It must be used diluted in
water in order to provide anti-freezing and anti-corrosive properties. The advisable percentage is 33%
of water volume. In case of very low environmental temperatures, increase the volume percentage
according to the following table:
Temperature (ºC) -10 -15 -20 -25 -30 -35
Percentage in water solution
(%) 23 31 37 43 48 53
PERMISSIBLE SNOW LOAD AND MEAN WIND VELOCITY
The collectors are tested according to the standards EN 12975-2. Through these tests, it is admitted
that they can resist without any failure to a mechanical load up to 2400 Pa.
