Manual

Installation
1.
Filling unit can be installed in either horizontal or vertical position.
It is, however, vital that the unit is not installed upside down.
Backflow preventer
The backflow preventer with atmospheric vent is designed to
protect drinking water systems from the return, caused by
backsiphonage or backpressure, of contaminated fluids.
The Caleffi 573 series has been specifically certified to standards
CSA B64.3 and ASSE 1012.
Flow rate graph
Code 573002A - 573009A
Charging unit consists of:
- Backflow preventer with intermediate atmospheric vent,
573 series
- Filling unit, 553 series
2. The special method of mechanical pre-adjustment with pressure
setting indicator makes it possible to set the unit to the required value
in the system before the beginning of the filling phase.
3. The unit is normally set at a pressure not less than that obtained by
adding the hydrostatic pressure and 4 psi (0,3 bar).
4. During filling, the internal mechanism will automatically regulate the
pressure until it reaches the required value, without the need to
oversee the filling operation itself. This prevents the system being
charged to a higher pressure than required.
5. Given the pre-calibrating function, the presence of the downstream
pressure gauge is not essential.
6. When the system is filled, the shut-off valve can be closed. In order
to restore the automatic topping-off condition, merely re-open the
valve. The pressure in the system will gradually return to the set
pressure.
1. Isolate the unit.
2. Open the lower control
knob.
3. Unscrew the adjusting
screw until it stops.
4. Remove the upper cover.
5. Extract the cartridge using
pliers.
6. The entire unit, after
inspection, can be
reassembled or replaced
using a spare cartridge.
7. Re-adjust the equipment.
Maintenance
For cleaning, inspection or
replacement of the entire
cartridge, proceed as follows:
➩
VENT
2
3
5
10
2 5
10
5
20 50
Δp (psi)
G
(l/min) (
gpm
)
20
10
5
(psi) (bar)
20
1 0.5 10 2 5 15
1
0.5
0.3
Cv = 0.7