Hi
‐
T
Centralized
controller
42
7
HNS
SYSTEM
DESCRIPTION
The
HNS
system
can
be
coupled
only
with
the
following
hydronic
units:
•
HWF/HWI
fan
coils;
•
LWF/LWI
fan
coils;
•
HCA/B
and
HCA/4B
hydronic
cassette
types;
•
HCN
ducted
types.
NOTE:
the
installation
with
the
MI
wall
mounted
types
is
not
possible.
There
are
2
ways
to
install
an
HNSbox
system:
1)
Purchase
of
the
DRAL
‐
NET
and
the
SB
modules
separately
and
subsequent
installation
on
the
unit
at
customer’s
expenses.
In
this
case,
it
is
possible
to
install
the
DRAL
‐
NET
control
on
the
wall
in
order
to
make
accessible
the
temperature’s
knob,
which
allows
an
adjusting
of
the
same
within
a
prefixed
control
set
by
the
Hi
‐
T.
For
example,
supposing
the
ambient
temperature
set
at
20°C
(via
Hi
‐
T),
it
is
possible,
by
means
of
the
DRAL
‐
NET’s
knob,
to
adjust
the
set
within
a
given
temperature
range,
such
as
+/
‐
5°C,
+/
‐
6°C
(adjusting
by
parameter),
and
the
like.
In
this
case,
the
whole
installation’s
procedure
is
at
the
installer’s
expenses.
By
and
large,
the
DRAL
‐
NET
is
fixed
on
the
wall
while
the
SB
interface
has
to
be
installed
on
board.
Use
a
TTL
connecting
cable
(standard
provided,
max.
length
4m)
between
the
DRAL
‐
NET
and
the
SB
interface:
2)
Purchase
of
the
HNSbox
where
,
inside,
the
DRAL
‐
NET
and
the
SB
devices
are
already
fitted
and
pre
‐
wired,
thus
providing
the
customer
with
a
terminal
board
for
connecting
the
hydronic
units.
In
so
doing,
it
is
not
possible
to
locally
adjust
the
temperature
by
means
of
the
DRAL
‐
NET
device
as
it
is
installed
inside
the
BOX.
The
hydronic
units’
temperatures
and
setting
parameters
can
all
be
controlled
via
the
Hi
‐
T
panel.
As
a
rule
of
thumb,
the
HNSbox
(IP56
GW44207
Gewiss
box)
is
installed
close
to
the
hydronic
unit,
wall
built
‐
in
or
on
the
side
of
the
hydronic
unit,
in
case
of
fan
coils
with
or
without
body,
or
upon
the
false
ceiling,
in
case
of
hydronic
cassette
types
or
ducted
types
installed
onto
the
false
ceiling:
The
Hi
‐
T
control
panel
allows
the
visualization
of
the
working
parameters
of
every
single
hydronic
unit
and
those
of
every
single
zone.
It
is
possible
to
manage
up
to
no.80
hydronic
units,
divided
into
no.
9
thermal
zones.
Every
hydronic
unit,
once
set
in
accordance
with
the
related
belonging
zone,
uses
its
own
probe
as
a
working
probe.
Should
the
HNS
system
be
coupled
with
our
i
‐
HWAK/WP
V2/V2+
and
i
‐
HP
chillers,
it
is
possible
to
manage,
via
a
single
Hi
‐
T
control
panel,
n°
7
chillers
in
cascade
and
no.80
hydronic
units
divided
into
no.9
thermal
zones.
The
connection
among
the
Hi
‐
T
panel,
the
minichillers
and
the
hydronic
units
is
very
simple:
it
is
made
by
means
of
a
SSTP
(ex.
CAT
5)
shielded
twisted
cable
connected
in
series.
Possible
configurations
•
n°
1
Chiller
terminal
units
not
connected
