INSTALLATION
21
2.11 System water filling and drainage
For the heat pump
B
HYDRONIC UNIT B
a loading system
is required.
Before filling and emptying the system, set the main switch of the
system and the main switch of the unit on "0" (off).
ON
OFF
The filling pressure of the cold system must be 1.2 -1.5 bar.
2.11.1 Water quality characteristics
In the heating / air conditioning system, water is used as heat trans-
fer fluid.
The quality of the water used must comply with the requirements
of the UNI 8065 standard, otherwise provide a treatment system.
REFERENCE VALUES
pH
7 ÷ 8
Electrical conductivity
10 ÷ 600 μS/cm
Chlorine ions
lower than 10 mg/l
Sulfuric acid ions
lower than 30 mg/l
Total iron
lower than 5 mg/l
Alkalinity M
lower than 100 mg/l
Total hardness
1 ÷ 2,5 mmol/l
Sulfur ions
none
Ammonia ion
none
Silicon ions
lower than 1 mg/l
If the hardness of the starting water exceeds the value indicated in
the table, a water softening system must be used.
9
An excessive water softening (total hardness <15°F) could
generate corrosive effects on the metallic parts (pipes or gen-
erators parts) Is suggested to limit the conducibility value with-
in 200 μS/cm.
0
It is forbidden to top up the system constantly or frequently, as
this can damage the heat exchanger of the appliance.
2.11.2 System filling-up
1
Filling valve
1
— before starting the loading check that the drain cock is closed
— check that the vents in the system are open
— aprire i dispositivi di intercettazione dell'impianto idrico
— caricare lentamente l'impianto
— close the system vents as soon as water comes out
—
check that the filling pressure of the cold system reaches the
value of about 1.2 - 1.5 bar
9
After a few hours of operation and some on / off cycles, check
the pressure and if necessary top up if less than 1 bar. The
make-up must be performed with the machine off (pump off).
0
2 3
5
6
4
1
2.11.3 Unit drainage
The units do not have a drain cock located inside. It must be pro-
vided outside near the appliance.
Before starting to empty the appliance:
— put the system main switch on "OFF" and the equipment
main switch on "0" (off)
— close the shut-off devices of the water system
— connect a drain pipe to the connection on the system
— open the drain tap outside the unit
Once done:
— close the drain valve outside the unit