Daitsu ELITE 3CSD3000] Manuel D'utilisateur page 52

IMPORTANT INFORMATION
1. Local regulations
This device should be installed in accordance with current local regulations.
2. Qualified installers
The device should be installed by appropriately-qualified professional plumbers.
3. Control and relief of pressure and temperature
The solar loop should be designed for ordinary operation at <500 kpa, installing a pressure release (reduction) valve on the main line
of cold water supply. The system design must include a device for reducing pressure to no more than 800 kpa (113 psi) and one for
discharging the hot water from the heating loop or the tank once the temperature reaches 99ºC (210ºF). It is recommended that the
temperature and pressure release valve (TPRV) lever be activated at least once every 6 months to check that it is working properly.
Take care to move it up and down gently.
4. Quality of the water
All water entering the multiple collector directly must, first of all, be potable; however, it must also fulfil the following requirements:
Total dissolved solids: ........................ < 600 mg/l o p.p.m.
Total hardness: .................................... < 200 mg/l o p.p.m.
Chloride: .............................................. < 250 mg/l o p.p.m.
Magnesium: ........................................
In hard water areas (>200 p.p.m.) a weight indicator may be suspended inside the collector tube. In such areas, it is a good idea to
install a device to soften the water to achieve long-term operation of the collector, or use a closed-configuration solar heat circula-
tion loop. If you use water/glycol, apart from the requirements listed above, the glycol must be changed periodically to prevent it
acidifying.
5. Metal corrosion
Both the copper and the stainless steel can become corroded with high concentrations of chloride. The solar panel can be used to
heat the water of a spa or a swimming pool but free chlorine levels should not exceed 2 p.p.m. However, the collector warranty, if
used to heat a spa or swimming pool, is 2 years, which is the standard for such applications. The level of chloride present in most
public potable water supplies is safe to use in the collector, providing that the water does not come from artesian wells.
6. Protection against frost
The system should include a device for protecting it against frost, a "low-temperature adjustment device" in the heat controller
collector, which will turn the pump on if the collector drops below a certain temperature (e.g. 5ºC - 41ºF). It is also possible to cre-
ate a closed loop filled with a mixture of water-glycol which will protect against frost. Vacuum tubes do not suffer from damage at
low temperatures and the heat pipes are protected against possible damage caused by the water inside them freezing.
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<10 mg/l o p.p.m.