CALEFFI 553 Series - User Manual

Function
The automatic filling valve is a device consisting of a pressure reducing valve with
compensating seat, visual system pressure setting indicator, an inlet filter, anti-scale
internal parts, 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 valve has been designed as 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 filling 50% faster than other valves. There are no levers to
flip or valve to close.
Pre-assembled with the 573 series backflow preventer, the AutoFill
™
Combo features
an atmospheric vent which is designed to protect drinking water systems from return
flow, caused by back-siphoning or back pressure, of contaminated fluids. The 573
series has been specifically certified to standards CSA B64.3 and ASSE 1012.
Pre-adjustable filling units
553 Series
38467.03
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553542A ½” M NPT inlet x ½" F NPT outlet
553549A ½” sweat inlet x ½" F NPT outlet
553642A ½” M NPT inlet x ½" F NPT outlet / gauge
553649A ½” sweat inlet x ½" F NPT outlet / gauge
553
Filling unit
Materials - body: ...........................................brass
- cover: .....................................PA 66 GF 30
- seals: ...........................................NBR
Performance
Suitable fluids: ..................................water, glycol solution
Max. percentage of glycol: ..................................... 50%
Max. inlet pressure: ..................................230 psi (16 bar)
Preset outlet pressure: ............................3–60 psi (0.2–4 bar)
Factory setting: .................................... 15 psi (1.035 bar)
Indicator accuracy: .................................±2 psi (±0.15 bar)
Max. working temperature: ...............................150°F (65°C)
Pressure gauge scale: ............................. 0–60 psi / 0–6 bar)
Connections - 553542A ........1/2" male NPT inlet x 1/2" female NPT outlet
- 553549A ..........1/2" sweat inlet x 1/2" female NPT outlet
- 553642A ........1/2" male NPT inlet x 1/2" female NPT outlet
- 553649A ..........1/2" sweat inlet x 1/2" female NPT outlet
Product Range
Technical
Specifications

CALEFFI 553 Series Specifications