i
‐
SHWAK
V4
Inverter
air/water
chillers
and
heat
pumps
with
floor
‐
standing
and
remote
condensing
units
31
Outdoor
unit
terminal
block
Terminals
Description
GND
Grounding
N1
Neutral
L1
Phase
1
L2
Phase
2
(only
for
three
‐
phase
systems)
L3
Phase
3
(only
for
three
‐
phase
systems)
NO
Power
supply
(230V
AC)
general
alarm
(closed
if
the
alarm
is
on)
N
Neutral
NC
Power
supply
(230V
AC)
general
alarm
(closed
if
the
alarm
is
off)
I+
/
I
‐
Modbus
Slave
Wiring
with
indoor
unit
R+
/
R
‐
Modbus
Master
Wiring
with
indoor
unit
GNDR
GND
reference
signals
(Modbus
reference
mass
for
connection
with
indoor
unit)
It’s
recommended
to
use
a
shielded
twisted
‐
pair
multipolar
cable
5x0.75mm
2
for
connecting
the
I
‐
,
I+
and
GNDR
terminals.
8.7.3
Wiring
between
indoor
and
outdoor
units
The
indoor
unit
must
be
connected
to
the
outdoor
unit
respecting
the
below
table.
Indoor
unit
terminal
block
Outdoor
unit
terminal
block
I+
I+
I
‐
I
‐
E+
R+
E
‐
R
‐
GNDR
GNDR
WARNING:
Do
not
confuse
on
the
terminal
block
of
the
outdoor
unit
between
the
terminals
GND
(protective
earth
of
the
power
supply)
with
GNDR
(ground
reference
for
Modbus
connection).
It’s
recommended
to
use
a
shielded
twisted
‐
pair
multipolar
cable
of
type
5x0.75mm
2
for
connecting
the
I
‐
,
I+
and
GNDR
terminals.
After
carrying
out
the
connection
between
the
units,
using
the
service
password
get
access
into
the
analogue
inputs
menu
"tP"
of
the
indoor
unit
control
panel,
check
that
the
temperature
measured
by
the
outside
temperature
sensor
(t17)
is
correct.
See
chapter
ANALOG
INPUTS
in
the
instructions
of
the
control
manual.
8.7.4
Removal
of
the
outdoor
unit’s
top
cover
for
getting
access
to
the
terminal
block
and
electric
box
The
following
illustration
shows
the
procedure
for
removing
the
front
‐
right
side
panel
in
order
to
reach
the
terminal
block
in
the
models
14
and
16.
1.
Remove
the
screws
connecting
the
top
plate;
two
for
each
side
of
the
unit
and
other
two
crews
connecting
the
top
plate
with
the
hole
‐
cable
plate
holder.
(For
the
small
sizes,
there
is
only
one
fixing
screw
in
the
controller’s
lateral
part
of
the
unit)
2.
Remove
the
screws
connecting
the
cover
plate
of
the
electric
box
then
proceed
to
connect
wire
to
the
terminal
block.
3.
Insert
the
cables
PG
cable
glands
located
on
the
side
of
the
unit
to
take
them
outside
the
unit
4.
Close
the
electric
box
and
the
top
panel
of
the
unit
with
their
fixing
screws.
The
above
operations
must
be
done
after
turning
off
the
unit
and
disconnecting
it
from
the
power
supply
(by
mean
of
an
appropriate
disconnecting
switch
which
must
be
already
mounted
by
the
installer).
Operations
to
be
performed
by
qualified
personnel.
Remove
the
top
cover
without
taking
away
the
holder
of
hole
‐
cable
plate.
The
work
is
completed,
please
fix
all
the
removed
plates
then
tighten
all
screws
and
washers
(if
expected).
To
replace
and
secure
the
front
‐
right
side
panel
follow
the
same
procedure
but
in
reverse.
8.7.5
Safety
thermostats
When
the
ELECTRIC
HEATER
kit
(except
the
DHW
electric
heater
of
1,2kW),
is
installed
on
the
models
MAR
and
MARS,
you
have
2
installed
thermostats
inside
the
single
box:
