i
‐
SHWAK
V4
Inverter
air/water
chillers
and
heat
pumps
with
floor
‐
standing
and
remote
condensing
units
19
8.4.1
Plant’s
water
characteristics
In
order
to
ensure
the
correct
operation
of
the
unit,
the
water
should
be
properly
filtered
(as
indicated
in
the
beginning
of
this
paragraph)
and
the
amounts
of
dissolved
substances
should
be
minimal.
The
maximum
permitted
values
are
given
in
the
below
table.
MAXIMUM
PHYSICAL
AND
CHEMICAL
CHARACTERISTICS
ALLOWED
BY
THE
WATER
OF
THE
PLANT
CIRCUIT
PH
7,5
‐
9
Electrical
conductivity
100
‐
500
μ
S/cm
Total
hardness
4,5
–
8,5
dH
Temperature
˂
65°C
Oxygen
content
˂
0,1
ppm
Maximum
glycol
content
50
%
Phosphates
(PO4)
˂
2ppm
Manganese
(Mn)
<
0,05
ppm
Iron
(Fe)
<
0,3
ppm
Alkalinity
(HCO3)
70
–
300
ppm
Chloride
ions
(Cl
‐
)
<
50
ppm
sulfate
ions
(SO4)
<
50
ppm
Sulfide
ion
(S)
None
Ammonium
ions
(NH4)
None
Silica
(SiO2)
<
30
ppm
8.4.2
Hydraulic
circuit
Key
Circulator
pump
FS
Flow
switch
FM
Flow
meter
3
bar
relief
valve
8
liters
expansion
vessel
Air
vent
valve
Y
‐
filter
with
metal
mesh
of
1000
micron
Temperature
sensor
R
Optional
auxiliary
E
‐
heater
with
double
protection
thermostat
Discharge
faucet
Check
valve
Manometer
0
‐
6
bar
Dial
thermometer
Flow
regulator
valve
1
Heat
exchanger
inlet
sensor
2
Heat
exchanger
outlet
sensor
3
DHW
technical
side
sensor
4
Primary
circuit
inlet
sensor
DHW
‐
R
5
DHW
‐
R
secondary
circuit
inlet
sensor
6
DHW-R secondary
circuit
outlet
sensor
7
Solar
management
sensor
(models
MARS
–
MARPS)