68
Instructions for the installer
3.14.2 Filling the solar plant
The solar plant should be filled when the collectors are cold, in the morning or in the evening. If this is not possible, cover the collectors with
sheets that do not let the sun rays through.
Keep in mind that the suggested solar plant pressure, in case of a classic installation with two collectors and a total surface of approximately
2.5 sq. m is of 3.5 bar approximately. In different systems, the filling pressure depends on the characteristics of the system. The solar expansion
vessel filling pressure should be the same as the system pressure.
To fill the solar plant, proceed as follows:
• Open the two ball valves on solar circuit flow and return (see Fig. 8 Key
components).
• Interrupt the flow into the system by closing valve (V). To do so, use a flat
screwdriver and bring the slot on the screw to a horizontal position.
• After opening cocks (A) and (B), always using a flat blade screwdriver, feed
heat transfer fluid through cock (A), using the relative pump suitable for
filling solar plants, and let it exit through cock (B) until fully bleeding any
air from inside the system.
• Slowly close the two cocks (A) and (B), so as to bring the pressure of the
solar plant to the system-specific value.
• Re-open the flow of liquid into the system, by slowly turning valve
(V), until the top part of float (G) indicates the desired flow value. It is
recommended to set a flow value of approx. 30 l/h for every sq. m of
installed solar collector (for example, one panel having an overall surface
of 2.5 sq. m corresponds to a recommended value of 75 l/h).
A
B
V
G
Fig. 19 Filling the solar plant
3.15 Starting up the boiler
3.15.1 Preliminary checks
Before starting the boiler, check that:
• the flue gas venting duct and the relevant terminal are installed in conformity with the instructions: with the boiler operating, there must
be no leakage of combustion by-products from any of the gaskets;
• the supply power to the boiler must be 230 V ~ 50 Hz;
• the system is correctly filled with water (stream gauge reading 1 to 1.3 bar);
• any shut-off cocks in the system pipes are open;
• the mains gas type is correct for the boiler calibration: convert the boiler to the available gas if necessary (see
Adaptation to other gas types
and burner adjustment
on page
78
): have this operation carried out by qualified technical personnel;
• the gas supply cock is open;
• there are no gas leaks;
• the main switch installed ahead of the boiler is turned on;
• boiler safety valves are not stuck;
• there are no water leaks;
• the condensate trap installed on the boiler is discharging condensate correctly and is not stuck.
3.15.2 Switching on and switching off
To switch the boiler on and off, refer to the “Instructions for the User” (see
Instructions for the user
on page
9
).
Содержание KBS 24 - 32
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