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9.3 - Non-return valve
The system has an integrated non-return valve which is necessary for correct 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 eventu-
ally 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 rotating 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 neces-
sary 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 positioning (Fig.21);
7. reposition the door and tighten the 2 screws (Fig.21).
65
Should one or more O-rings be lost or damaged during maintenance operations
on the non-return valve, they must be replaced. Otherwise the system might not
work correctly.
Figure 21
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