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.
22
When
the
three
‐
way
valve
is
de
‐
energized,
it
is
turned
towards
the
plant
side
position.
If
you
look
at
front
valve,
the
way
normally
open
is
in
the
left
side
8.4.7
Plant
circuit
unloading
If
it’s
necessary
to
drain
completely
the
indoor
unit,
connect
with
a
pipe
to
the
service
valves
(only
one
valve
for
the
models
MAR/MARS,
both
service
valves
for
the
models
MARP/MARPS).
Then
unscrew
the
cap
of
the
service
valve
and
connect
to
the
hose
pipe
joint
connecter
a
pipe
of
14
mm
(inner
diameter)
which
must
be
connected
to
the
drain
water,
then
proceed
to
evacuate
the
plant
circuit
by
unscrewing
the
knurled
nut.
After
the
end
of
the
process,
close
again
the
knurled
nut
and
screw
the
cap.
Refer
to
the
previous
paragraph
regarding
the
position
and
the
utilization
mode
of
the
valves.
8.5 INDICATIVE DIAGRAMS OF THE PLANT CIRCUIT
WARNING:
The
diagrams
shown
in
this
paragraph
are
should
be
considered
only
for
illustration
purpose.
In
the
Handbook
(see
Paragraph
29)
are
shown
diagrams
with
more
details
and
comprehensive
with
all
the
logical
and
hydraulic
connections
in
the
various
possible
configurations.
Anyway,
the
study
and
the
approval
of
the
specific
installation
context
of
the
plant
are
always
required
by
a
qualified
heating
engineer.
8.5.1
Standard
schematic
diagram
of
the
plant
BOILER
To
DH
W
us
es
Additional
expansion vessel
(not supplied)
Fr
om
th
e
so
la
rp
la
nt
THE
RECOMMENDED
CONNECTIONS
ARE
THE
INSTALLER’S
RESPONSABILITY
Hydronic circuit
Indoor unit
(models: MARS/MARPS)
OUTDOOR UNIT
It’s
the
installer’s
responsability
to
connect
the
gas
and
liquid
pipes
From the boiler (technical water)
To the boiler (technical water)
To
th
e
sol
ar
pl
ant
Solar plant
expansion vessel
(not supplied)
From the plant
To the domestic
uses
Loading/Topping up line
Water
supply
inlet
PLANT
To the plant
P
T
P
T
Key
Filter
with
extractable
cartridge
Loading
group
with
pressure
reducer
device
Discharge
valve
3
bar
relief
valve
Shut
‐
off
valve
Non
return
valve
Thermometer
Manometer
0
‐
6
bar
3
‐
way
anti
‐
scalding
thermostatic
valve
Domestic
water
mixer
NTC
temp.
sensor
for
immersion
(solar
collector)
Controlled
discharge
valve
for
overtemperature
During
the
operations
of
loading/topping
up,
the
plugs
of
the
air
vent
valves
must
be
partially
unscrewed
to
allow
air
to
flow
freely
out
of
the
valves.
The
MAR/MARS
models
are
equipped
with
two
air
vent
valves;
one
is
installed
on
the
single
puffer
in
correspondence
to
the
three
‐
way
valve.
The
MARP/MARPS
models
are
equipped
with
three
air
vent
valves,
one
for
the
DHW
technical
side
puffer,
one
on
the
plant
side,
and
the
other
near
the
three
‐
way
valve.
Refer
to
position
2
of
the
Paragraph
25.1
and
the
Paragraph
25.2.
(2)
Stopper
of
the
air
vent
valve
When
it’s
necessary
to
top
up
the
circuit
of
the
plant
or
to
adjust
the
title
of
glycol
(in
the
cases
described
in
Chapter
22),
you
can
use
the
service
valves.
Unscrew
the
cap
of
the
service
valve
and
connect
to
joint
connector
a
hose
pipe
of
14
mm
(inner
diameter)
which
should
be
connected
to
the
water
supply,
then
unscrew
the
knurled
nut
to
load
the
plant
circuit.
At
the
end
of
the
operation,
retighten
the
knurled
nut
and
screw
the
cap.
At
any
case,
it‘s
recommended
to
use
an
external
water
tap
for
loading
the
plant
circuit,
this
should
processed
by
the
installer.
(A)
service
valve
of
plant
side
puffer
tank
(models
MARP/MARPS)
(B)
service
valve
of
DHW
technical
side
puffer
tank
(3)
knurled
nut
(4)
stopper
with
gasket
