ENGLISH
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13.
MAINTENANCE
Disconnect the power supply before starting any work on the system.
The system requires no routine maintenance operations.
However, below are the instructions for performing the special maintenance operations that may be necessary in particular cases (e.g.
emptying the system to put it away during a period of inactivity).
13.1 Accessory tool
With the product DAB supplies an accessory tool (wrench) that is useful for carrying out the operations contemplated on the system
during installation and any special maintenance operations. (Fig.17)
The accessory tool is used for: opening and closing the Dock, removing the NRV, turning the caps.
It is housed behind the expansion vessel. (Fig.6)
If the key is lost or damaged, the same operation can be performed with a 10mm (13/32 inch) socket wrench). The
only operation for which the tool can be replaced is to open and close the Dock. You will need a screwdriver for the
caps and pliers to extract the NRV.
Figure 17
13.2 Emptying the system
If you want to drain the water out of the system, proceed as follows:
1. disconnect the electric 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. if there is a check valve immediately downstream from the system (always 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 always recommended to have a
check valve immediately upstream from the system) so as not to drain the whole suction system;
5. remove the two drainage caps on the dock and let out the water inside (about 11 litres); Fig.18
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.
13.3 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
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, see fig. 19:
1. disconnect the electric power supply;
2. drain the system;
3a. remove the four screws;
3b. remove the cap using the accessory tool (or pliers);
3c. remove the valve
3d. clean the valve under running water, ensure that it is not damaged and replace it if necessary.
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.
13.4 Motor shaft
The electronic control of the system ensures smooth starts so as to avoid excessive stress on the mechanical parts and thus prolong the life of
the product. In exceptional cases this characteristic could cause problems in starting the pump: after a period of inactivity, perhaps with the
Figure 19
Figure 18
