THERMOSIPHONIC SOLAR WATER HEATERS / TECHNICAL DOCUMENTATION / PAGE 34
XΙΙΙ) FUNCTION AND MAINTENANCE
In order to protect the system from overheating, during high irradiation periods, it is highly
recommended to install a T-P valve at the domestic hot water outlet, allowing the direct evacuation
of the overheated sanitary water to the sewerage system. This T-P valve shall be set up to 60 °C.
Otherwise cover the surface of the collector partially when there is low consumption or fully when
there is no consumption at all (long period of absence). For this purpose choose the specialized covers
for Calpak M4 collectors.
It is also possible to install an expansion vessel at the upper part of the tank, which will store the
liquid of the closed circuit when expanding and prevent it from spreading in the atmosphere. In this
case the safety valve is installed above the expansion vessel.
In case the solar heater’s performance drops, check that:
1. Orientation to the south is correct (or North for the South hemisphere)
2. The collector is at the appropriate angle, free of shadow and obstacles
3. All the connections are tight, with no leaks
4. The tubes of the closed circuit have the correct angle and do not generate siphoning
5. There are not any air bubbles in the closed circuit
6. The closed circuit is full of thermal fluid
7. There is no leakage or a mixing mistake in the domestic hot water supply.
For proper system maintenance a specialist should check every year (preferably September or
October):
1. The magnesium rod of the tank, which should be free from salt deposits and to a size larger
than 50% of its initial state. Otherwise must be replaced.
2. If the closed circuit of the tank needs to be filled with Nox Fluid (see page 1 for correct
proportion) to ensure both the corrosion and antifreeze protection of the tank as well as the
good performance of the heat exchanger.
3. The proper operation of the electrical resistance
4. If the safety valve at the cold water inlet is normally operating (if there are accumulated salts
and is not possible to be cleaned, it must be replaced).
5. If the collector’s glass is clean
6. Any other possible damage
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