Riello NXC 021 - System Charging and Emptying; System Charging Procedure

Installation
70
EN
2.10.1 Water quality requirements
Waterisusedasaheattransferuidwithintheheating/co-
olingsystem.
Thequalityofthewaterutilizedmustbecompliantwiththe
requirementsindicatedintheUNI8065standard,otherwise
anappropriatetreatmentsystemmustbeinstalled.
Reference values
PH 6-8
Electricalconductivity lessthan200mV/cm(25°C)
Chlorine ions less than 50 ppm
Sulphuricacidions less than 50 ppm
Total iron less than 0.3 ppm
MAlkalinity less than 50 ppm
Totalhardness lessthan25°F
Sulphur ions none
Ammonium ions none
Silicon ions less than 30 ppm
Ifthehardnessoftheinitialwaterexceedsthevalueindica-
ted
inthetable,awatersofteningsystemmustbeutilized.
 Excessivewatersoftening(totalhardness<15°F)couldre-
sult
corrosionphenomenawherevercontactismadewith
metallicelements(pipesorboilercomponents).Thecon-
ductivity
valuemustalsobekeptwithin200µS/cm.
2.10 CHARGING AND EMPTYING THE SYSTEMS
RIELLONXCunitsrequiresachargingsystem.
Beforellingoremptyingthesystem,setthesystem'smain
switchandthedevice'smainswitchtotheir"0"(off)posi-
tions.
2.10.2 Charging the system
• Priortoinitiatingthellingoperation,checkthatthedi-
scharge
valveisclosed;
• checkthatthesystem'sairventsareopen;
• openthewatersystem'sshut-offdevices;
• slowlychargethesystem;
• closethesystem'sairventsassoonaswaterstartstocome
out.
1
1
NXC 017-021
1. Filling unit
1
1
ON
OFF
ON
OFF
NXC 026-040
NXH 026-040