Caleffi 267 Manuale d'uso
Pagina 15
Commissioning
• Close the fill/drain cock of the balancing valve with flow meter (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 balancing valve with 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 in the lowest point of the system.
Flushing the system
• Close the ball valve in the balancing valve with flow meter (1). The operation puts the panel side in communication with the fill/drain cock. Then open
the fill/drain cock, turning it counter-clockwise using the cap equipped with control key (2).
• By means of a (separate) external pump applied on the fill/drain cock of the safety unit, let the medium flow through the solar panels and
the heat exchange circuit until the fluid comes out of the fill/drain cock of the balancing valve with flow meter (3).
• Briefly open the ball valve in the balancing valve with flow meter (4), so as to expel all the air from the system.
• Leave the external pump running on the system for a few minutes to ensure correct flushing.
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