Hitachi UTOPIA RAS-3HVRC2 - Commissioning

10.3.2 Wire size and Main switch protection
Recommended minimum sizes for eld provided wires and select the main switches according to the next table:
Model Power supply
Power source cable size Transmitting cable size
Max. current
(A)
CB
(A)
ELB
(nº poles/A/mA)
EN60 335-1 EN60 335-1
All Indoor Units
1~ 230V 50Hz
0.75 mm²
0.75 mm²
5.0 6
2/40/30
RAS-3HVRC2 4.0 mm
2
15.8 20
? NOTE
• ELB:EarthleakageBreaker;CB:Circuitbreaker
• Followlocalcodesandregulationswhenselectingeldwires,CircuitbreakersandEarthLeakagebreakers.
• Usethewireswhicharenotlighterthantheordinarypolychloroprenesheathedexiblecord(codedesignation60245IEC57).
11 COMMISSIONING
When installation is completed, perform test run according to the
following procedure, and hand over the system to the customer.
Perform test run regarding indoor units one by one in order, and
conrm that the electrical wiring and the refrigerant piping are
correctly connected.
! CAUTION
Donotoperatethesystemuntilallthecheckpointshavebeencleared:
• Checktoensurethattheelectricalresistanceismorethan1MΩ,by
measuring the resistance between ground and the terminal of the
electricalparts.Ifnot,donotoperatethesystemuntiltheelectrical
leakage is found and repaired. Do not impress the voltage on the
terminalsfortransmission1and2.
• Check to ensure that the stop valves of the outdoor unit are fully
opened,andthenstartthesystem.
• Checktoensurethattheswitchonthemainpowersourcehasbeen
ONformorethan12 hours,towarmthecompressoroilbytheoil
heater.
Payattentiontothefollowingitemswhilethesystemisrunning:
• Do not touch any of the parts by hand at the discharge gas side,
sincethecompressorchamberandthepipesatthedischargeside
areheatedhigherthan90°C.
• DONOTPUSHTHEBUTTONOFTHEMAGNETICSWITCH(ES),it
willcauseaseriousaccident.
• Donottouchanyelectricalcomponentsformorethanthreeminutes
afterturningOFFthemainswitch.
• Conrmthatthegaslinestopvalveandtheliquidlinestopvalveare
fullyopen.
• Conrmthattheleakageoftherefrigerantdoesnotexist.Theare
nutsaresometimesloosenedbyvibrationduringtransportation.
• Checkthattherefrigerantpipingandtheelectricalwiringconformto
thesamesystem.
• ConrmthattheDIPswitchsettingontheprintedcircuitboardofthe
indoorunitsandtheoutdoorunitsarecorrect.
• Checkwhetherornottheelectricalwiringoftheindoorunitsandthe
outdoor units are connected as shown in the chapter “10 Electric
wiring”.
! CAUTION
Conrmthateld-suppliedelectricalcomponents(mainswitchfuse,fuse-
freebreaker,earthleakagebreakers,wires,conduitconnectorsandwire
terminals)havebeenproperlyselectedaccordingtotheelectricaldata
givenintheTechnicalCatalogoftheunitandensurethatthecomponents
complywithnationalandlocalcodes.
? NOTE
For2 indoorunits system check the indoor unit outlet air temperature
at test run. If the temperature difference is large (aprox. 10 deg. or
more(cooling)20deg.ormore(heating)rechecktherefrigerantpiping,
installationmayhavesomeproblem.
COMMISSIONING
PMML0548 rev.0 - 04/2020 - A10648790A
14
EN