Filling And Emptying The System; Water Quality Requirements; Filling The System; Emptying The Device - Riello NexPolar Series Installation And Technical Service Instructions

INSTALLATION

2.11 Filling and emptying the system

The R NexPolar heat pump unit requires a filling system.
Before filling or emptying the system, set the system's main switch
and the device's main switch to their "0" (off) positions.
O N
O F F
The system's cold filling pressure must be between 1.2 and 1.5 bar.
2.11.1

Water quality requirements

Water is used as a heat transfer fluid within the heating/cooling
system.
The quality of the water utilized must be compliant with the re-
quirements indicated in the UNI 8065 standard, otherwise an ap-
propriate treatment system must be installed.
rEFErENCE ValUES
PH
Electrical conductivity
Chlorine ions
Sulphuric acid ions
Total iron
M Alkalinity
Total hardness
Sulphur ions
Ammonium ions
Silicon ions
If the hardness of the initial water exceeds the value indicated in
the table, a water softening system must be utilized.
9
Excessive water softening (total hardness <15 °F) could result
corrosion phenomena wherever contact is made with metallic
elements (pipes or boiler components). The conductivity value
must also be kept within 200 |μS/cm.
0
It is forbidden to frequently or continuously top-up the heating
system, as this could damage the boiler's heat exchanger.
6-8
less than 200 mV/cm (25°C)
less than 50 ppm
less than 50 ppm
less than 0.3 ppm
less than 50 ppm
less than 25 °F
none
none
less than 30 ppm
2.11.2

Filling the system

1
1
Filling unit
— Prior to initiating the filling operation, check that the dis-
charge valve is closed
— check that the system's air vents are open
— open the water system's shut-off devices
— slowly fill the system
— close the system's air vents as soon as water starts to come
out
— check that the system's cold filling pressure reaches a value
of 1.2 to 1.5 bar
— allow the system to cool, and bring the water pressure back
up to 1.2 - 1.5 bar if necessary
9
After few hours of operation and few turning on / off cy-
cles, check the pressure and reintegrate it if lower than 1 bar.
Reintegration must be carried out with machine off (pump off).
3
2
4
1 5
6
0
2.11.3

Emptying the device

The NexPolar units are equipped with an internal discharge valve.
In order to access the discharge valve, the side panel must be re-
moved.
— unscrew the fastening screws
— slide the panel downward
— pull the panel towards you
20