2.1 Normal operation (heating water by the sun)
If your solar water heater is operating inefficiently or is not heating the water in the
storage tank, you must consult an authorized dealer or the service Department of
SUN&HEAT.
Possible reasons for unsatisfactory performance of a DHWS are:
• low level of heat transfer fluid inside the collector loop
• a dusty or soiled collector surface
• an object shading the collector (e.g. a tree, a building, etc.)
Adding heat transfer fluid
With suitable experience and tools, it is possible for the
owner of the solar system to add fluid to the closed loop.
• A proper solution of water, antifreeze and corrosion inhibitor can be added
to the top part of the tank (see paragraphs 4.13 and 4.14), either from the
opening for the expansion tank or from the opening of the closed loop safety
valve (see Figures 4.1).
• The fluid in the closed loop should be replenished at times when there is
no sunshine, that is at times when the fluid in the closed loop is at a low
temperature.
• Properly attach again the part removed (expansion tank, safety valve).
In the case when repeated addition of antifreeze solution is necessary, possible
leakage points must be located and repaired. This must be done by an authorized
dealer or by the Service Department of SUN&HEAT.
ATTENTION
At times when there is sunshine, the fluid inside the collector loop
and the expansion tank is at a very high temperature and pressure. Add fluid early
in the morning or late in the afternoon, when the fluid temperature is low.
2.2 Operation using the back-up electric heater.
If your solar system does not heat water after turning on the electric heater, check
the relevant electric fuse on the electrical switchboard.
In any other case, consult an authorized dealer or the Service Department of SUN&HEAT.
If the problem arises after the summer or after you have been away on holiday, it is
probably owed to the thermal safety switch of the thermostat. It can be repaired, in a
matter of minutes, by an electrician, without needing to replace any spare parts.