Hydraulic Connections - Granit COMFORT Premium C-85 Instrucciones De Instalación Y Mantenimiento


Earth connection must be ensured.
The system cannot support the weight of the piping which must therefore be provided with other kind of support.
Risk of water temperature rising inside the pump: pump operation for a prolonged time without the
distribution of water, or with reduced distribution, can cause an increase of the water temperature inside the
pump up to a value such as to cause damage to property or persons at the time of distribution. This situation
generally occurs after the pump has undergone a long series of switching on and off operations. It occurs
typically in rigid systems (without an expansion vessel) and the causes may be:
- a small leak (even just a few drops) that causes a fall in pressure that restarts the pump, but does not
allow a sufficient exchange of water
- too low RP values that do not allow the stabilisation of pressure and regular switching off
- an incorrect setting of the GI and GP gains which makes the adjustment swing
The situation is aggravated in the case of:
- a high setpoint (SP), which contributes to the distribution of greater power to the water
- very long switching off times T2 that contribute to prolong the time during which power is distributed to
the water.
It is always good practice to position the system as close as possible to the liquid to be pumped.
The system must be operated only when positioned horizontally and resting stably on its rubber feet.
In case of fixed installation, make sure the position selected ensures access and visibility to the command and control panel
(6-Fig.1).l
In case of fixed installation, make sure sufficient space is provided to allow for routine maintenance of the built-in filter (Sect.
9.2).
In case of fixed installation, fit an On/Off valve on the suction side as well as the delivery side. This makes it possible to easily
close the line upline and/or downline of the system for any maintenance and cleaning or for shutdown periods.
In case of fixed installation, the use of an expansion tank is recommended, to be connected on the delivery piping, so as to
make the system elastic and protect it from water hammer. The capacity of the expansion tank is not binding (1 litre - 0.26
gall - is sufficient), the recommended precharge is 1 bar (14.5 psi) less than the set point.
If the water is particularly loaded with foreign bodies and the number of cleaning operations on the built-in filter is to be
reduced, install an additional external filter at the system infeed to stop the impurities.
The installation of a filter on intake causes a decrease of the system's hydraulic performance proportional to
the loss of load caused by the filter itself (generally the greater the filtering power, the greater the fall in
performance).
2.1

Hydraulic connections

The system ensures the declared performances only if piping with diameter not less than those of the openings of the
system (1") are used at the inlet and outlet.
With reference to its position with respect to the water to be pumped, the installation of the system may be defined "above
head" or "below head". In particular the installation is defined "above head" when the pump is placed at a level higher than
the water to be pumped (e.g. pump on the surface and water in a well); vice versa it is "below head" when the pump is
placed at a level lower than the water to be pumped (e.g. overhead cistern and pump below).
If the installation is of the "over head" type, install the suction pipe from the water source to the pump in such a way as to
avoid the formation of goosenecks or siphons. Do not place the suction pipe above the pump level (to avoid the formation
of air bubbles in the suction pipe). The suction pipe must draw at its entrance at a depth of at least 30 cm (11.8 in.) below
the water level and must be watertight along its whole length, as far as the entrance to the electropump. For suction depths
of over four metres or with long horizontal stretches it is advisable to use an intake hose with a diameter larger than that
of the intake aperture of the pump. If the suction pipe is made of rubber or flexible material, always check that it is of the
reinforced vacuum-resistant type to avoid shrinkage due to suction.
If the installation is of the "positive suction head" type, avoid "goosenecks" and siphons in the suction piping and make
sure it is water-tight.
The suction and delivery ducts must be connected to the system by means of the threads provided: 1 inch male thread on
swivel connector made of technopolymer.
When making the connection airtight by adding material (e.g. Teflon, hemp,...) make sure you avoid
excessive use of the gasket. under the action of a suitable tightening torque (e.g. long-handle pipe wrench),
the excess material may exert abnormal forces on the technopolymer connector, damaging it permanently.
The swivel connectors make it easier to install the system.
2.2 Loading Operation
Installation above head and below head
Installation "above head" (par. 2.1): remove the Filler cap (3-Fig.1) by unscrewing it manually or using the tool provided,
also remove the breather cap (5-Fig.1) using a screwdriver or the tool provided; then fill the system with clean water through
the filler port (approx. 1 liter - 0.26 US gal.). As soon as the water starts flowing through the bleeding port, carefully screw
the cap back on, top up further through the filler port and screw the filler cap back on until it comes to a mechanical stop.
It is recommended to fit the non-return valve at the end of the suction pipe (foot valve) so as to be able to fill it quickly too
ENGLISH
5