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.
44
17
READING
OF
THE
INDOOR
UNIT
MANOMETERS
Each
indoor
unit
is
equipped
with
two
manometers.
The
difference
between
the
manometers
(1
and
2)
reading
can
be
used
as
approximate
value
for
verifying
the
water
flow
rate/pressure
head
when
the
unit
works
on
the
plant.
To
the
difference
of
manometers
value
you
should
subtract
the
pressure
drop
of
the
3
‐
way
valve
for
getting
an
approximate
value
of
the
available
pressure
head
of
the
plant.
The
characteristic
curve
corresponding
to
the
Head
pressure
versus
Water
flow
rate
of
the
three
‐
way
diverter
valve,
whose
values
should
be
deducted
at
the
manometry
for
verifying
with
sufficient
accuracy
the
available
static
pressure
of
the
plant
system
at
the
nominal
operating
points
marked
in
the
curves
of
Chapter
16.
For
certainty
raisons,
it
is
recommended
to
remove
5%
from
the
obtained
values.
18
DHW
INSTANTANEOUS
PREPARER
Here
below
are
indicated
the
operating
regions
of
the
instantaneous
DHW
preparer
versus
the
temperature
of
the
primary
circuit
(DHW
temperature
of
technic
side)
and
the
water
flow
rate
of
the
secondary
circuit
(DHW
withdrawal
rate),
for
different
values
of
the
set
temperature
of
domestic
hot
water
(T"_Set_DHW).
The
region
of
operation
corresponding
only
to
the
optional
electric
heater
is
indicated
with
red
dashed
lines.
WARNING:
It
is
necessary
to
install
on
the
DHW
line
between
the
instantaneous
preparer
and
the
mixers
of
domestic
hot
water,
an
anti
‐
scald
thermostatic
valve
calibrated
at
45°C.
Otherwise
there
is
a
serious
risk
of
burning
and
severe
scalding.
WARNING:
Make
sure
that
there
are
no
air
bubbles
in
the
water
supply
inlet,
otherwise
the
flow
meter
will
not
work
properly.
Therefore
a
relief
valve
or
an
air
vent
should
be
installed
on
the
mains
water
inlet
pipe.
WARNING:
The
minimum
water
flow
rate
of
the
secondary
circuit
(water
supply)
required
for
the
system
start
‐
up
is
3
litres/min.
The
maximum
water
flow
rate
of
the
secondary
circuit
should
not
exceed
40
litres/min,
the
system
goes
wrong
over
this
value.
T”_Set_DHW=40°C
