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9.2 - Emptying the system
If you want to drain the water out of the system, proceed as follows:
1. disconnect the power supply;
2. turn on the delivery tap closes to the system so as to remove pressure
from the system and empty it as much as possible;
3. f there is a check valve immediately downstream from the system (al-
ways recommended), close it so as not to let out the water that is in the
plant between the system and the first turned on tap;
4. interrupt the suction pipe in the point closest to the system (it is al-
ways recommended to have a check valve immediately upstream
from the system) so as not to drain the whole suction system;
5. remove the drainage cap (fig.1 face E if vertical configuration; fig.1
Face C if horizontal configuration) and let out the water inside (about
1.5 litres);
6. the water that is trapped in the delivery system downstream from the
non-return valve integrated in the system can flow out at the time
of disconnecting the system, or on removing the cap of the second
delivery (if not used).
Though essentially drained, the system is unable to expel all the
water that it contains.
During handling of the system after emptying it, some small
amounts of water may probably leak out from the system.
67
Figure 20
9.3 - Non-return valve
The system has an integrated non-return valve which is necessary for cor-
rect operation. The presence of solid bodies or sand in the water could
cause malfunctioning of the valve and therefore of the system. Although it
is recommended to use fresh water and eventually fit filters on input, if you
notice abnormal operation of the non-return valve it can be extracted from
the system and cleaned and/or replaced by proceeding as follows:
1. remove the access door to the special maintenance compartment
(Fig.1 Face F) disengaging the 2 fixing screws with the accessory
tool. It is advisable not to remove the screws completely, so that you
can used them to extract the door. Take care not to drop the screws
inside the system once you have removed the door (Fig.21);
2. using a screwdriver, remove the 1"1/4 cap so as to access the non-
return valve (Fig.21);
3. using pliers, extract the cartridge of the non-return valve without rotat-
ing it, gripping it by the jumper provided for the purpose (Fig.21): the
operation may require a certain effort;
4. clean the valve under running water, ensure that it is not damaged
and replace it if necessary;
5. put the complete cartridge back in its seat: the operation requires the
force necessary to compress the 2 O-Rings (Fig.21);
6. Screw on the 1"1/4 cap until it is snug: if the cartridge has not been
pushed correctly in place, screwing on the cap will complete its posi-
tioning (Fig.21);
7. reposition the door and tighten the 2 screws (Fig.21).
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