Installation manual

12
N.B.: do not activate the solar system if the optional 2 sensor kit has not been
installed because this may cause the system to malfunction and you may
have to call the service centre to resume boiler operating
1
2
Display in solar mode:
- When the solar function is activated, an
icon lights up indicating the solar system
- For 10 s after activation of the solar pump,
the temperature of the collector sensor is
displayed in large digits and the temperature of
the tank solar sensor (sanitary sensor) in small
digits.
The solar system operates when the flat collector temperature is higher than the solar tank
temperature as set in parameter 5 which defines the temperature differential between the
collector and the boiler. When exceeded, the solar system circulator comes on. This
parameter is adjusted as explained in paragraph 3.2.
If the differential is very low, between 5 and 10°C, the circulator will come on frequently to
disperse the small amount of heat that has accumulated in the panels. With a differential of
between 10 and 15°C, the circulator is activated less frequently because more time is
needed to recreate the difference in temperature between the two devices. Even higher
differentials should be avoided in the winter when solar radiation is limited and large
differences in temperature are difficult to obtain. We recommend a differential of
approximately 10-15°C which is a good compromise for the entire year. If this way, the
setting made by your authorised installer will not need adjusting.
1.5. CH pressure regulation
Periodically check that the pressure of the heating system is about 1÷1.3 bar; if pressure is
below 1 bar, when the boiler is cool, it is to be restored by cock placed in the boiler lower
part.
After the operation close the block
If pressure reaches 3.0 bar, it may activate the safety valve (fig. 1 pos. 20). In this case,
call our After-Sales Service. Please, do the same if pressure decreases frequently.
1.6 Periodical check-ups.
At the end of every heating period the boiler and its components, the external air duct (if
present), the flue pipes and the condense drainage system are to be inspected by our
authorised service centre in order to guarantee both the apparatus efficiency and the
proper systems operations.
Careful maintenance is always a good safety and money saving measure.
1.7 Antifreeze feature.
The boiler is equipped with a standard antifreeze feature which activates the pump and the
burner when the boiler temperature falls below 8°C and 6°C. It can be equipped with an
optional DHW circuit antifreeze device. The antifreeze feature is guaranteed if the boiler is
perfectly working, if it is not locked and it is electrically operated with the selector on the
DHW or DHW/CH position. Before a long absence, please check that the system is
completely emptied.
Fig. 10