Hitachi UTOPIA R410A Series - 10 ELECTRIC WIRING

10 ELECTRIC WIRING
10.1 GENERAL CHECK
! DANGER
• Do not connect or adjust any wiring or connections unless the
main power switch is OFF. Check and test to ensure that if there
is more than one source of power supply, all are turned OFF.
• Use an earth leakage breaker with medium sensitivity, and an
activation speed of 0.1 or less. If this is not tted, there is a risk
of electric shock and/or re.
• Install an earth leakage breaker, fuse or circuit breaker of the
specic capacity for each outdoor unit power line. Not tting it
may cause an electric shock or re.
• Check that the earth wire is securely connected, tagged and
locked in accordance with national and local codes.
! CAUTION
• Beforeanyworktotheelectricalwiringorregularinspections,switch
offthemainspowersupplyoftheindoorandoutdoorunits.Waitthree
minutesbeforestartinginstallationormaintenancework.
• Makesurethattheinteriorandexteriorfanshavecometoacomplete
standstill before starting work on the electrical wiring or regular
inspections.
• Protect cables, the drainage pipe, electrical components, etc. from
rodents and insects; otherwise these might damage unprotected
componentsandthiscouldresultinre.
• Donotallowcablestocomeintocontactwiththerefrigerantpipes,
metaledges,printedcircuitboards(PCB)ortheelectriccomponents
insidetheunit;thecablesmaybedamagedandthiscouldresultin
re.
• Makesuretherefrigerantpipesandcommunicationcablesbetween
theoutdoorandindoorunitsareconnectedtothesamerefrigeration
cycle.Failuretodosocouldleadtoabnormaloperationsoraserious
accident.
• Makesurethattheeld-suppliedelectriccomponentsintheinstallation
(mainspowerswitches,earthleakagebreaker,circuitbreaker,cables,
connectors, cable terminals and others) have been selected and
installcorrectlyinlinewiththeelectricaldatagiveninthisManual.Also
makesurethatthesecomponentsarecompliantwithlocal,national
andregionalelectricalregulations,codesandstandards
• Connectingtheoperatinglinecablesincorrectlymayleadtofaultsin
thePCB.
• Firmlysecurethecablesinsidetheoutdoorunitwithplasticanges.
• Checktoensurethatscrewsforterminalblockaretightlytightened.
• Secure the cable of theremote control switch with the cord clamp
insidetheelectricalbox.
• Wrapthe accessory packing around thewires,and plug the wiring
connectionholewiththesealmaterialtoprotecttheproductfromany
condensedwaterandinsects.
• Checktoensurethattheindoorfanandtheoutdoorfanhavestopped
beforeelectricalwiringworkorperiodicalcheckisperformed.
• Leadthewiresthroughtheknockoutholeinthesidecoverwhenusing
conduit.
• Secure the cable of theremote control switch with the cord clamp
insidetheelectricalbox.
• Electricalwiringmustcomplywithnationalandlocalcodes.Contact
yourlocalauthorityinregardstostandards,rules,regulations,etc.
• Makesuretheelectriccomponentsintheinstallation(earthleakage
breaker,circuitbreaker,cables,connectors,cableterminalsandmain
powerswitches)havebeenselectedcorrectlyinlinewiththeelectrical
datagiveninthisManual.Alsomakesurethatthesecomponentsare
compliantwithnationalandlocalcodes.
• Checkthatthegroundwireissecurelyconnected.
• ConnectafuseorCBofspeciedcapacity.
? NOTE
• To avoid electromagnetic noise interferences use shielded wires
for H-LINK communication twist pair wire (more than 0.75 mm²)
operationwiringbetweenoutdoorunitandindoorunit,andoperation
wiringbetweenindoorunitandindoorunit.
• H-LINKtwistpairshieldedwiremustbegroundedintheoutdoorunit
side.
• Using cable sections between units no longer than 300 m, and
using cables according to local codes and regulations. H-LINK
communicationcircuitshallbenotlongerthan1000mintotallength
• Sometimes, the refrigeration/heating system is not able to operate
correctly in cases when the system is supplied from the same
supply line as other major consumers (heavy machinery, power
inverter systems, cranes, welding machinery, etc). Also when the
supplycablesofthemajorconsumersandthesystemareveryclose
together,inductioninthewiringmayariseduetoarapidchangein
theelectricityconsumptionoftheaboveconsumersandtheirstart-up.
• Checkand test to ensure that if there is more thanone source of
powersupply,thatallareturnedOFF.
• Check the connection of the power wiring terminals and supply
voltageaccordingtoeachmodelspecication.
1 
electromagnetic compatibility, next table indicates:
Maximum permissible system impedance Z
max
at the
interface point of the user’s supply, in accordance with
EN61000-3-11
MODEL Z
max
(Ω) MODEL Z
max
(Ω)
 0.30  -
 0.30  -
 0.30  -
2 Harmonics situation of each model regarding EN 61000-3-2
and EN 61000-3-12 is as follows:
MODELS SITUATION
REGARDING EN 61000-3-2
AND EN 61000-3-12 Ssc “xx”
MODELS
Ssc
“xx”
(KVA)
Equipment complying with
EN 61000-3-2 (professional use)
 -
Equipment complying with
EN 61000-3-12
 633
3 Check to ensure that the power supply voltage is within

4 Check to ensure that power supply has an impedance low
enough to warranty not reduce the starting voltage more

Electric wiring
PMML0545 rev.2 - 04/2021
13
EN