ECONCEPT SOLAR ST
14
EN
cod. -- - 11/2010 (Rev. 00)
•
The solar circuit must be perfectly tight. Check all the joins between pipes and correct execution of any welds. Use
pressure fittings only of the thermal resistance guaranteed by their manufacturer is equal to 200ºC.
•
The presence of air in the solar circuit considerably affects its efficiency . It is necessary to install venting devices in
the highest points of the solar circuit (e.g. at the tops of the columns) and make sure the system is completely vented
after commissioning and after every maintenance operation . The delivery and return pipes must be installed with
adequate slopes towards the vents, avoiding the creation of air pockets. Automatic or manual devices (recommend-
ed) can be used as venting devices. The venting devices must be resistant to temperatures up to 150°C. If the sys-
tem is not working and the automatic venting devices are not blocked, steam can come out . Therefore the automatic
venting devices must be blocked while the system is working.
•
The solar circuit must be filled with suitable heat transfer fluid, specific for solar systems. Recommended products:
"FERSOL LT" or "FERSOL ULTRA LT" which provide adequate antifreeze protection for temperatures to -12°C and
-25°C respectively. In general, choose the type of fluid according to the outside temperature in relation to the heating
system in the place of installation . Add approx. 7°C to this temperature (e.g. -5°C) as a safety factor : therefore in
the above example, the antifreeze protection of "FERSOL LT" fluid will suffice. FERSOL premixed solar fluid con-
tains non-toxic propylene glycols and corrosion inhibitors thermostable to 300°C (peak temperature limit condition
reachable for very short periods).
•
For solar system filling and venting operations, refer to sec. 3.2. For periodical fluid and maintenance checking op-
erations, refer tosec. 3.3.
System water charcteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO
3
), the use of suitably treated water is advisable in order
to avoid possible scaling in the boiler. The treatment must not in any case reduce the hardness to values below 15°F
(Decree 236/88 for uses of water intended for human consumption). Water treatment is indispensable in the case of
very large systems or with frequent replenishing of water in the system. If partial or total emptying of the system be-
comes necessary in these cases, it is advisable to refill it with treated water.
Antifreeze system, antifreeze fluids, additives and inhibitors
The boiler is equipped with an antifreeze system that turns on the boiler in heating mode when the system delivery water
temperature falls under 6°C. The device will not come on if the electricity and/or gas supply to the unit are cut off. If it
becomes necessary, it is permissible to use antifreeze fluid, additives and inhibitors only if the manufacturer of these
fluids or additives guarantees they are suitable for this use and cause no damage to the heat exchanger or other com-
ponents and/or materials of the boiler unit and system. It is prohibited to use generic antifreeze fluid, additives or inhib-
itors that are not expressly suited for use in heating systems and compatible with the materials of the boiler unit and
system.
2.4 Gas connection
B
Before making the connection, ensure that the unit is arranged for operation with the type of fuel available and
carefully clean all the pipes of the gas system to remove any residues that could affect good functioning of the
boiler.
The gas must be connected to the relative connector (see fig. 33) in conformity with current standards, with rigid metal
pipes or with continuous flexible s/steel wall tubing, placing a gas cock between the system and the boiler. Make sure
that all the gas connections are tight. The capacity of the gas meter must be sufficient for the simultaneous use of all
equipment connected to it. The diameter of the gas pipe leaving the boiler does not determine the diameter of the pipe
between the unit and the meter; it must be chosen according to its length and loss of head, in conformity with current
standards.
B
Do not use the gas pipes to earth electrical appliances.
