Riello 20161608, Installation And Technical Service Instructions

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21
INStAllAtION
2.11 System water filling and drainage
For the heat pump
R
NXH 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
transfer fluid.
The quality of the water used must comply with the require-
ments 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
generators parts) Is suggested to limit the conducibility val-
ue within 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
provided 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