Emptying The System; Non-Return Valve - DAB e.sybox Instructions Pour L'installation Et L'entretien

GB
ENGLISH
Use of end "E":
this is practically a straight tip screwdriver
of the correct size for manoeuvring the
motor shaft access cap and, if the inter-
face for quick connection of the system
has been installed (par. 15.3), for access
to the key for disengaging the connec-
tion. If the key is lost or damaged, the
same operations can be performed using
a straight tip screwdriver of a suitable
size.
Use of end "F":
the function of this tool is dedicated to
maintenance of the non-return valve and it is better described in the
respective paragraph 10.3.

10.2 - 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 - if there is a check valve immediately downstream from the sys-
tem (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 drainage cap (fig.1 face E) and let out the water
inside (about 2.5 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).
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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.

10.3 - 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:
1- remove the valve access cap (Fig.28);
Figura 27
2- insert the accessory cross key in end "F" (par. 10.1) so as to
catch the perforated tab with the hooks (Fig.28);
3- extract without rotating: the operation may require a certain
effort. A cartridge is extracted which also holds the valve to be
serviced. The cartridge remains on the key (Fig.28);
4- disengage the cartridge from the key: the hooks are released
by pushing the cartridge and the key against each other, at this
point slip the cartridge off the side (Fig.28);
5- clean the valve under running water, ensure that it is not dam-
aged and replace it if necessary;
6- put the complete cartridge back in its seat: the operation
requires the force necessary to compress the 2 O-rings. If neces-
sary, use end "D" of the cross key to help you push. Do not use
end "F" or the hooks will again engage the tab of the cartridge
and it will be impossible to release them (Fig.28);
7- Screw on the cap till snug: if the cartridge has not been pushed
correctly in place, screwing on the cap will complete its position-
ing (Fig.28).