Caleffi 269 User Manual
Page 6
Commissioning
•
Close the flow meter fil/drain cock (1) and increase the system pressure up to the maximum design pressure, by means of the external filling
pump applied to the fill/drain cock of the safety unit. When this pressure is reached (2), close the fill/drain cock of the safety unit using the cap
equipped with control key.
•
Open the valves of the unit (3) and switch on the pump of the solar circulation unit (do not remove the temperature gauges).
•
Let the water circulate for a certain time, then check the water tightness.
•
Open the air vent again, installed in the highest point of the solar thermal system, repeating the deaeration phase, briefly activating the
circulation pump.
•
Restore the desired working pressure with the filling pump.
•
The system flow rate may be changed by means of the flow meter (4). This modulation is performed by the ball valve with which it is
equipped (see respective characteristics). To regulate/limit the flow rate it is recommended to follow the indications of the solar panel
manufacturer.
•
After the first operating hours, the solar thermal system must be deaerated again, both in the highest point and on the air separator (on the
versions where this is contemplated).
Once deaeration has been completed, check the system pressure and if necessary restore to the desired working pressure.
Draining the system
•
The draining operation is necessary if the system has been filled only with water and there is a risk of frost.
•
Open the shut-off and check valves, turning the ball valve through 45°. Open the air vents in the highest point.
•
Open the drain cock at the lowest point of the system.
Flushing the system
•
Close the flow meter regulating ball valve (1). Then open the fill/drain cock, by turning it counter-clockwise using the cap with control key (2).
•
By means of a (separate) external pump applied on the fill/drain cock of the safety unit (3), let the medium flow through the solar panels and
the heat exchange circuit until the medium comes out of the fill/drain cock (4) of the flow meter.
•
Briefly open the flow meter ball valve (4) to expel all the air from the system.
•
Leave the external pump running on the system for a few minutes to ensure correct flushing.
0
20
40
60
80
100
120
140
160
0
20
40
60
80
100
120
140
160
con
forme norme ISPE
SL
0
2
4
6
8
10
bar
CL
2.5
1
13
11
9
7
5
3
l/min
1
2
3
4
1
2
3
4
6