Manual

Pre-adjustable filling units
& backflow preventer
series 553 - 573
Function
The automatic filling unit is a device consisting of a pressure
reducing valve with compensating seat, an inlet filter, a shut-off
valve and a check valve.
It is installed on the water inlet piping in sealed heating systems,
and its main function is to maintain the pressure of the system
stable at a set value, automatically filling up with water as required.
This product has the characteristic of being pre-adjustable,
which means that it can be adjusted at the required pressure
value before the system charging phase.
After installation, during the filling or topping-off phase, the water
feed will stop when the set pressure is reached.
A pre-assembled version is also available, complete with upstream
backflow preventer.
CALE FFI
Product range
Code 553542A Filling unit with pressure gauge and pressure setting indicator Size 1/2”
Series 573 Backflow preventer with intermediate atmospheric vent with threaded connections Size 1/2” - 3/4”
Series 573 Backflow preventer with intermediate atmospheric vent with sweat connections Size 1/2”
Code 573002A Charging unit complete with backflow preventer 573 series with threaded connections Size 1/2”
Code 573009A Charging unit complete with backflow preventer 573 series with sweat connections Size 1/2”
01061/08 NA
Replaces 01061/04 NA
R
E
G
I
S
T
E
R
E
D
BSI EN ISO 9001:2000
Cert. n° FM 21654
UNI EN ISO 9001:2000
Cert. n° 0003
Technical specification
Filling unit
Material: Body: brass
Cover: PA 66 GF 30
Seals: NBR
Maximum Working Pressure: 230 psi (16 bar)
Pressure setting range: 3÷60 psi (0.2÷4 bar)
Factory setting: 15 psi (1.035 bar)
Indicator accuracy: ±2 psi (±0.15 bar)
Maximum Working Temperature: 150°F (65°C)
Connection: Inlet: 1/2” NPT Male
with union tailpiece
Outlet: 1/2” NPT Female
Backflow preventer
Material: Body: brass
Filter: stainless steel
Check valve: PSU
Check valve stem: brass
Diaphragm: EPDM
Seals: EPDM
Maximum working pressure: 175 psi (12 bar)
Maximum working temperature: 210°F (99°C)
Medium: water
Certified to: CSA B64.3 and ASSE 1012
Connections: 1/2”-3/4” NPT female with union
1/2” sweat with union
USC