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ENGLISH

9 - PARTICULAR INSTALLATIONS

9.1 - Inhibiting self-priming

The product is made and supplied with the capacity of being self-priming.

With reference to par. 6, the system is able to prime and therefore operate

in whatever installation conguration chosen: below head or above head.

However there are cases in which the self-priming capacity is not nec-

essary, or areas where it is forbidden to use self-priming pumps. During

priming the pump obliges part of the water already under pressure to return

to the suction part until a pressure value is reached at delivery where-

by the system can be considered primed. At this point the recirculating

channel closes automatically. This phase is repeated each time the pump

is switched on, even already primed, until the same pressure value that

closes the recirculating channel is reached (about 1 bar).

When the water arrives at the system intake already under pressure (maxi-

mum allowed 2 bar) or when the installation is always below head, it is pos-

sible (and mandatory where local regulations require it) to force the closure

of the recirculating pipe, losing the self-priming capacity. This obtains the

advantage of eliminating the clicking noise of the pipe shutter each time

the system is switched on.

To force closure of the self-priming pipe, proceed as follows:

1. disconnect the power supply;

2. empty the system (unless you decide to inhibit self-priming at the

rst installation);

3. remove the drainage cap anyway, taking care not to drop the O-ring

(Fig.18);

4. with the aid of pliers take the shutter out of its seat. The shutter

will be extracted together with the O-Ring and the metal spring with

which it is assembled;

5. remove the spring from the shutter; insert the shutter in its seat

again with the respective O-Ring (side with gasket towards the in-

side of the pump, stem with cross-shaped ns towards the outside);

6. screw on the cap after having positioned the metal spring in side

so that it is compressed between the cap itself and the with cross-

shaped ns of the shutter stem. When repositioning the cap ensure

that the respective O-Ring is always correctly in its seat.

7. ll the pump, connect the power supply, start the system.

Figure 18

DAB E.sybox User Manual

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