Overview; Product Description; Operation - Xylem LOWARA GVA Manual De Instalación Y Operación

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1.

Overview

The pressure booster sets of the GVA, GDV series are designed to transfer and boost clean water
pressure in water systems for homes, offices, communities and industry.
Limits of use (standard configuration)
Fluid temperature:
Ambient temperature:
Operating pressure:
Minimum inlet pressure:
Maximum inlet pressure:
Starts per hour:
ATTENTION
2.

Product Description

The pressure booster set consists of identical electric pumps connected in parallel and mounted on a
common stand, suction and delivery manifolds, on-off valves, check valves, pressure gauge, pressure
transmitters, frequency converters and a three-phase control panel.
In GVA sets, each electric pump is equipped with an Aquavar IPC frequency converter.
In GDV sets, each electric pump is equipped with a Danfoss FC202 frequency converter.
In GVA and GDV sets, the converter is installed outside the control panel.
The system must be equipped with a membrane tank. The delivery manifold is fitted with couplings
designed for installation of 24-litre tanks with on-off valve. Along with the tanks, provide a suitable manifold
support. Additional floor-standing tanks may be installed and connected to the manifold.
3.

Operation

The pumps are controlled by the converters according to system requirements.
The membrane tank provides for initial water demand.
When the pressure drops to the control value, the first variable speed pump starts running.
If the water demand rises, the speed increases until the subsequent pumps also start.
If the demand drops, the speed decreases until the pumps stop.
If the demand drops further, the last pump fills the tank and then shuts down.
Three-Phase Version
The three-phase version has a three-phase control panel, the frequency converters power the motors with
variable frequency three-phase voltage.
On the control panel are installed automatic line protection circuit breakers for each frequency converter,
as well as a main switch.
14
0°C to +80°C
0°C to +40°C
Max 8 bar, 10 bar, 16 bar, 25 bar, depending on pump type (see
booklet)
According to NPSH curve and flow resistance; level should be raised
by a safety margin of at least 0.5 metres if water contains air.
The inlet pressure plus the pressure supplied by the pump against the
closed valve must always be lower than the maximum operating
pressure.
Do not exceed the number of starts per hour indicated in section 12.
Limitations to fluid temperature and pressure may be imposed by the membrane
tank. Observe the operating limits!