Riello NXC 021 - Equipment Description

General information
56
EN
NCXandNXHunitsareshippedwithafulloperatingcharge
of refrigerant. Refer to table I.
Ifisneverthelessnecessarytoaddmorerefrigerant,run
theunitforsometimeincoolingmodeandthenslowly
addliquidrefrigerantintothesuctionsideuntilthereare
no bubbles in the sight glass.
NCX and NXH units use a R-410A refrigerant charge. For
yourinformation,wearereproducingheresomeextracts
fromtheofcialpublicationdealingwiththedesign,in-
stallation, operations and maintenance people involved
intheseactivities,agreedbytheairconditioningandre-
frigerationindustry.
Refrigeration guidelines
Refrigeration installation must be inspected and main-
tainedregularlyandrigorouslybyspecialist.Theiractivi-
ties must be overseen and checked by properly trained
people.
Tominimisedischargetotheatmosphere,refrigerantand
lubricating oil must be transferred using which reduce
leaksandlossestoaminimum.
Ifanyoildrainingorrecoveryoperationbecomesneces-
sary,theuidtransfermustbemadeusingmobilecon-
tainers.
• Leaksmustberepairedimmediately
• Servicevalvesttedtheowandreturnlinespermitcharge
transfertoasuitablyarrangedexternalcontainer.
• Itisindispensabletouseadedicatedtransferstation.
• Compressor lubricating oil contains refrigerant. Any oil
drainerfromasystemduringmaintenancemusttherefore
behandledandstoredaccordingly.
• Refrigerantunderpressuremustneverbedischargedtothe
atmosphere.
Recharging liquid refrigerant
R-410Arefrigerantoperatesat50%-70%higherpressures
than R 22.
Besurethatservicingequipmentandreplacementcom-
ponentsaredesignedtooperatewithR-410A.
ThecylindersthatcontainR-410Aarepink.
ThecylindersthatcontainR-410Areprovidedwithadip
tube that allows uid to escape from the cylinder both
whenuprightpositionandwhenturnedupsidedown.
Unit R-410A should be charged with liquid refrigerant.
Applya common ow regulatoravailableonthe market
tothehosepipetovaporizetheliquidrefrigerantbefore
is enters the unit.
R-410A, like other HFCs is only compatible with the oils
selectedbythemanufacturerofcompressors(POE).
NOTE:
Regularlycarryoutleakcheckandimmediatelyrepairany
leakfound
1.3 DESCRIPTION OF THE EQUIPMENT
NXCand NXH units are intended mainly forcommercial ap-
plicationssuchastheair-conditioningofofcesandpublic
buildings.
NXCunitsarededicatedtocoolingonlyapplications.
NXHunitsoperateinsteadbothinheatingandcoolingmode.
AllunitsuserefrigerantgasR410A.Theproductischaracter
-
ised
by:
• Paintedsheetframe;
• Scrolltyperotarycompressorttedonanti-vibrationsup
-
ports;
• Elec
tronicallycontrolledfansabletoensurelownoiseop-
eration;
• Elec
tronics integrated in the machine and controlled
through a microprocessor;
• Integratedhydronickitequippedwithcentrifugalpump.
The machines have an operating range between -15°C and
40°CforNXHunitsandbetween-10°Cand48°CforNXCunits.
The Pro-Dialog+ controllermanages allparametersand the
operationofallmaincomponents(compressor,fans,expan
-
sion
elements…).
Italsoprovidesthepossibilityto:
•
 plantheoperationusingtheinternalclockandaprogram-
mableweeklycalendar;
• controluptotwounitsinparallel;
• limitfanspeed,reducingtheirnoisethankstothe“night
mode”function.
Theunitcanbealsocontrolledwiththefollowingsystems:
• Free contacts;
• Remote control.