Product Overview

Most closed-loop hydronic systems lose small amounts of water and
air over time. These losses come from automatic air vented purging of
dirt separators, weepage at air vents, valve packings or circulator flange
gaskets. Fluid loss also occurs when a component such as a circulator
is replaced. Over time, a standard make-up water assembly would
allow untreated water to enter a system as demineralized water is lost.
If the system was filled with treated demineralized when commissioned,
untreated make-up water could bring undesirable compounds, such as
calcium carbonate, back into the system. To prevent this, Caleffi offers
an enhanced assembly, code NA573022, that includes a demineralizer
cartridge. This is a replenishment water treatment assembly consisting
of a backflow preventer and a pre-adjustable automatic filling valve
with pressure gauge used to automatically feed small quantities of
demineralized water into the system. This assembly is shown above. This
unit would be installed, of course, after initially filling the system with the
Caleffi NA570 series HYDROFILL™ portable water treatment filling unit.
This assembly uses a special 10-inch cartridge insert, code NA573102,
containing the color changing resin beads necessary to demineralize
water passing through it at relatively low flow rates. The cartridge
assembly can be isolated by closing the two ball valves. The clear
housing can then be unscrewed to remove and replace the cartridge.
The Caleffi cartridge will appear blue color when new. Its internal color
will change to amber as the resin beads approach a spent condition.
Each cartridge can demineralize approximately 30 gallons of water. This
should provide several years of normal make-up water supply, assuming
only minor water losses from the system occur.
Characteristic components
AutoFill™,
code 553642A
Filter housing, code NA573100, with
demineralizing cartridge, code NA573102
Isolation ball valves
AutoFill™ lling unit
Pre-calibration
The AutoFill
™
features a pressure
setting indicator as shown. Before
filling the system, use a screwdriver to
turn dial to the intended system
pressure.
Anti-scale materials
The central housing containing
the moving parts and the
internal compensating spindle are
made of a low adhesion coefficient
plastic. This material minimizes the
risk of formation of scale deposits,
the main cause of malfunctions.
Diaphragm-seat seal
The useful working surface of the
diaphragm is particularly large, in order to maintain stable pressure
in a system at
a preset value
regardless
ofinlet pressure
variations. This
feature is also
useful in that it gives greater power to
the sliding of the spindle and overcomes
friction. Due to the low flow rates, the
AutoFill
™
seat has been designed
with the smallest possible diameter.
This guarantees greater precision and
sensitivity to maintain its operating
characteristics unchanged over time.
Spindle guide
In order to reduce the frictional surfaces, the spindle unit guide has
been positioned in
the upper part of the
device. It consists of
four spokes formed
directly on the plastic
central support.
Removable lter cartridge
The cartridge containing the operating mechanisms, protected by a
large surface area strainer, is removable. This permits easy and quick
inspections, internal cleaning and cartridge replacement.
Fast lling
The AutoFill
™
fast fills the system to set pressure, up to 5-1/2 gpm filling
rate, then automatically shuts offthe water feed.
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0
15
30
45
60
0
4
2
psi
bar
Backflow preventer,
code 573403A