i
‐
SHWAK
V4
Inverter
air/water
chillers
and
heat
pumps
with
floor
‐
standing
and
remote
condensing
units
47
19.3 MAINTENANCE OF THE CIRCULATOR
For
removing
and/or
working
on
the
circulator
pump,
there
is
no
need
to
evacuate
the
plant
circuit,
just
stop
the
fluid
to
flow
from
both
upstream
and
downstream
sides
by
closing
the
ball
valve
(1)
(by
rotating
the
knob
clockwise)
and
closing
the
flow
regulator
valve
(2)
(horizontal
calibration
pin).
19.4 REGULATION OF THE FLOW RATE OF HEAT TRANSFER FLUID IN THE PANELS
IMPORTANT:
Before
doing
any
regulation,
it
is
necessary
to
evacuate
the
air
from
the
plant.
In
order
to
do
that,
you
should
place
the
circular
controller
(A)
at
the
maximum
possible
flow
rate
and
then
wait
the
complete
air
evacuation
from
the
vent
valve
of
the
plant
(not
supplied).
After
that,
place
the
calibration
valve
of
the
solar
group
in
“full
open
position”
(pivot
in
vertical
position).
If
the
system
is
properly
installed,
under
the
normal
conditions,
the
regulator
will
activate
the
circulator
(cold
tank
and
solar
collectors
at
normal
temperature
conditions).
Place
the
indicator
“A”
on
the
desired
curve
position.
Read
the
desired
flow
rate
through
the
graduated
scale
of
the
flow
controller.
Some
advices
of
the
procedure
to
be
respected
regarding
the
air
evacuation
from
the
circuit
of
the
plant
during
the
first
start
‐
up
of
the
unit:
Fill
the
plant
with
pressure
as
high
as
3
‐
4
bar.
If
necessary,
switch
the
pump
on
and
off
several
times
to
speed
up
the
air
transportation.
If
necessary,
close
briefly
the
filling
cock
–
for
to
increase
of
the
plant
pressure
‐
and
open
it
again
to
eliminate
air
bags.
In
the
end,
change
the
flow
direction
to
completely
evacuate
the
tank’s
heat
exchanger.
19.5 TECHNICAL CHARACTERISTICS
The
indicated
technical
characteristics
take
into
account
a
nominal
flow
rate
of
35
lt/h
per
m
2
of
collector
surface.
TECHNICAL
CHARACTERISTICS
Unit
Model
MARS
/
MARPS
Solar
circuit
Maximum
water
flow
lt/s
0,049
Pump
head
kPa
74
Maximum
pressure
of
solar
circuit
bar
6
Maximum
temperature
°C
120
Maximum
solar
surface
m
2
5
Solar
exchange
coil
surface
m
2
0,7
Maximum
head
of
the
pump
kPa
74
Maximum
power
of
the
pump
W
75
Maximum
absorbed
current
of
the
pump
A
0,60
Energy
Efficiency
Index
(E.E.I.)
pump
≤
0,21
19.6 INTEGRATED SECURITY SYSTEMS IN THE CONTROL
Integrated
safety
logics
are
included
into
the
control
software
for
protecting
the
collectors,
the
sanitary
accumulator
and
the
circulator.
To
see
the
specific
logics,
please
refer
to
the
control
manual.
Refer
also
to
the
plant’s
diagram
shown
below
or
to
the
diagrams
reported
in
the
chapter
8.5.
WARNING:
If
the
system
tends
to
result
oversized,
the
expected
protection
in
extreme
cases
to
discharge
the
domestic
hot
water
in
the
water
supply
network
through
the
discharging
valve
which
must
be
installed
out
of
the
unit,
it’s
then
the
installer’s
responsibility
to
mount
it.
(A)
