i
‐
SHWAK
V4
Inverter
air/water
chillers
and
heat
pumps
with
floor
‐
standing
and
remote
condensing
units
Note:
All
the
pictures
in
this
manual
are
for
explanation
purpose
only.
They
may
be
slightly
different
from
the
unit
you
purchased.
The
actual
shape
shall
prevail.
48
Frigorific lines
Chilled water
inlet
T
P
T
P
Hydraulic safety
group
To the domestic
utilities
Water supply inlet
Discharge valve
Check valve
Manometer 0
‐
6 bar
Filter with extractable cartridge
Loading group with pressure
reducer device
Dial thermometer
3
‐
way anti
‐
scalding thermostatic valve
Domestic water mixer
Shut
‐
off valve
NTC temp. sensor for immersion
Expansion vessel
Air vent valve
3 bar relief valve
T
P
ST
KEY
P
P
ST
From loading group
Return of the plant
Plant outlet
Electronic timer
20
OPTIONAL
DHW
TECHNICAL
SIDE
BOILER
KIT
The
indoor
unit
in
all
its
versions
can
be
coupled
to
other
external
energy
source
in
addition
to
the
solar
energy
source,
such
as:
gas
boiler,
pellet
boiler
and
any
other
energy
source
that
it
is
implementable
in
the
control
with
the
characteristics
of
having
a
proper
circulator
and
working
with
a
variable
∆
T
without
exceeding
20
‐
25°C.
The
kit
provides
the
internal
pipes
of
connection
between
the
DHW
technical
side
puffer
tank
and
attacks
disposed
for
the
installation.
The
installer
must
provide
required
hydraulic
connections
for
connecting
the
indoor
unit
with
the
auxiliary
energy
source
as
described
in
Paragraph
8.4.2,
and
control
setting
as
described
in
the
control
manual.
21
OPERATION
LIMITS
21.1 Evaporator water flow rate
The
nominal
water
flow
rate
is
referred
to
a
temperature
differential
of
∆
T=5°C
between
inlet
and
outlet
of
the
evaporator.
The
allowed
maximum
flow
rate
is
corresponding
to
∆
T=3°C;
higher
values
may
cause
too
high
pressure
drops.
The
allowed
minimum
water
flow
rate
corresponds
to
∆
T=8°C
(except
for
the
model
i
‐
SHWAK
V4
06
for
which
the
maximum
value
is
∆
T=6,25°C
and
for
“i
‐
SHWAK
V4
08”
model
the
maximum
temperature
difference
is
∆
T=7,5°C).
Insufficient
water
flow
may
in
fact
cause
too
low
evaporating
temperatures
with
the
intervention
of
safety
devices
for
stopping
the
operation
of
the
unit
and,
in
some
particular
cases,
the
water
can
freeze
in
the
evaporator
coil
causing
the
refrigeration
circuit
to
break
down
or
causes
the
increasing
of
the
condensing
pressure
with
the
shutdown
risk
of
the
appliance
and
the
compressor
could
be
damaged.
We
enclosed
below
a
most
accurate
table
showing
the
minimum
water
flow
that
should
be
ensured
for
the
plate
heat
exchanger
in
order
to
have
the
proper
operation
of
unit
as
a
function
of
the
model
(note:
the
water
flow
switch
is
used
for
preventing
the
freezing
sensor
from
failure
in
the
case
of
insufficient
water
flow
but
it
does
not
ensure
the
minimum
flow
rate
required
in
order
the
unit
can
work
properly).
Model
i
‐
SHWAK
V4
06
08
10
12
14
16
Required
minimum
water
flow
rate
[m
3
/h]
0,71
0,86
1,08
1,30
1,48
1,64
Required
maximum
water
flow
rate
[m
3
/h]
1,88
2,30
2,87
3,47
3,95
4,37
As
a
first
approach,
and
in
the
absence
of
other
detection
systems,
the
proper
water
flow
for
getting
the
best
performance
from
your
unit
can
be
found
at
maximum
speed
of
the
circulator,
using
the
pressure
gauges
for
controlling
the
pressure
difference
between
the
return
and
the
delivery
water
on
the
outside
water
connections
of
the
unit
and
make
sure
that
such
value
is
equal
or
less
than
the
available
head
pressure
indicated
on
the
curve
shown
in
chapter
16
for
the
respective
models
and
if
it’s
necessary
you
change
the
settings
(for
the
related
circulator)
that
are
reported
in
the
control
manual.
21.2 Chilled water production (summer operation)
The
allowed
minimum
temperature
at
the
evaporator’s
outlet
is
5°C;
for
lower
temperatures,
the
unit
should
undergo
some
necessaries
structural
modifications
and
different
setting
parameters
of
the
controller
with
micro
‐
processor.
In
this
case
contact
our
company
for
the
feasibility
study
and
evaluation
of
changes
to
be
made
according
to
your
requests.
The
maximum
temperature
that
can
be
maintained
at
the
outlet
of
the
evaporator
is
25°C.
In
any
case,
the
maximum
electrical
input
occurs
for
the
heat
pump
operating
mode
at
a
water
outlet
temperature
of
55°C
and
with
outdoor
temperature
of
‐
10°C.
