Hitachi PC-ARFG-E - Electrical Wiring

EN
3 ELECTRICAL WIRING
! DANGER
Always make sure to turn o the power of the indoor unit when performing electrical wiring work.
Performing electrical wiring work with the power turned on can damage the circuit boards of the
indoor unit and the remote control switch.
Wiring Example:
AB
AB
AA
BB
Remote
control switch
Remote control
switch (Subsidiary)
Electrical box of
indoor unit
Max. 16 Indoor units
Electrical box of
indoor unit
Terminal board Terminal board
M3.5
screws
M3
screws
M3.5
screws
Use 0.75mm
2
cable, 2-Conductor, Stranded Copper
? NOTE
• Communicationcablingmustbeaminimum0.75mm
2
,2-Conductor,StrandedCopper.Shieldedcable
mustbeconsidered forapplicationsandroutinginareasofhighelectronicinterference(EMI)and
othersourcesofpotentiallyexcessiveelectricalnoisetoreducethepotentialforcommunicationerrors.
Whenshieldedcablingisapplied,properbondingandterminationofthecableshieldisrequiredas
perJohnsonControls-HitachiAirConditioningguidelines.Plenumandriserratingsforcommunication
cablesmustbeconsideredperapplicationandlocalcoderequirements.Theuseofanyothergrade
ofcableotherthanthatspeciedabovecanresultindamagefromEMI.
• Keepaclearanceofmorethan30cmbetweenthetransmissionline(remotecontrolswitchcable
andtransmissionwires)andthepowersourceofindoorunits.Otherwise,theair-conditionermaynot
operateproperlyormalfunctionmayoccurduetotheeectofpowersourcenoise.
• Refertothedocumentationprovidedwitheachunitwhenperformingelectricalwiringworkbetween
theremotecontrolswitchandindoorunits,forthepropersettingofrefrigerantcyclenumberandindoor
unitaddress.
• Nogapshallexistbetweentheremotecontrolswitchcableandtheholeoftheremotecontrolswitch
case.Ifthereisagap,coverthegapwithvinyltape.Otherwise,malfunctionmayoccurduetothe
entranceofwaterdropletsorinsects.
• Incaseofoperatingwithtworemotecontrolswitches(MainandSub),setthemainandsubremote
controlswitchesbyselectingtheappropriatefunctionwiththeremotecontrolswitchesfollowingthe
contentsofFunctionselectionandsettingchapter.Uponcompletionofsettings,turnothepower
supplyofalltheindoorunitconnectedtotheremotecontrolswitches.
Electrical Wiring
PMML0564 rev.1 - 09/2021
3