Hitachi RAS-3.0UFESNH1 - Outdoor Unit Control Board Faults


Wiring
!
WARNING
• TurnOFFthemainpowerswitchoftheindoorunitandtheoutdoorunitandwaitformorethan3minutesbeforeelectricalwiring
workoraperiodicalcheckisperformed.
• Check to ensure that the indoor fan and the outdoor fan have stopped before electrical wiring work or a periodical check is
performed.
• Protectthewires,electricalparts,etc.fromratsorothersmallanimals.Ifnotprotected,ratsmaygnawatunprotectedpartsand
attheworst,arewilloccur.
• Avoidthewiringfromtouchingtherefrigerantpipes,plateedgesandelectricalpartsinsidetheunit.Ifnotdo,thewireswillbe
damagedandattheworst,arewilloccur.
• InstallanELB(ElectricLeakageBreaker)inthepowersource.IfELBisnotused,itwillcauseelectricshockorreattheworst.
• Thisunitusesan inverter,whichmeans thatit mustbe usedanearthleakdetector capableofhandingharmonicsinorderto
preventmalfunctioningoftheearthleakdetectoritself.
• Do not use intermediate connection wires, stranded wires (see <Attentions when Connecting the Power Supply wiring>),
extensioncablesorcontrollineconnection,becausetheuseofthesewiresmaycauseabnormalheat,electricshockorre.
• The tightening torque of each screw is shown as follows.
M4:1.0to1.3Nm
M5:2.0to2.5Nm
M6:4.0to5.0Nm
M8:9.0to11.0Nm
M10:18.0to23.0Nm
Keeptheabovetighteningtorqueduringwiringwork.
!
CAUTION
• Use tape material to wrap the wire and seal wiring holes to prevent the condensed water and insects.
• Tightly secure the power source wiring by using the cord clamp inside the unit.
 NOTE:Fixtherubberbusheswithadhesivewhenconduittubestotheoutdoorunitarenotused.
General Check
1. Makesurethattheeld-selectedelectricalcomponents(mainpowerswitches,circuitbreakers,wires,conduitconnectorsand
wireterminals)havebeenproperlyselectedaccordingtotheelectricaldata.
MakesurethatthecomponentscomplywithNationalElectricalCode(NEC).
2. Checktoensurethatthevoltageofpowersupplyiswithin10%ofnominalvoltageandearthphaseiscontainedinthepower
supply wires. If not, electrical parts will be damaged.
3. Checktoensurethatthecapacityofpowersupplyisenough.Ifnot,thecompressorwillnotbeabletooperatebecauseof
abnormal voltage drop at starting.
4. Checktoensurethattheearthwireisconnected.
5. Installamainswitch,multi-polemainswitchwithaspaceof3.5mmormore,singlephasemainswitchwithaspaceof3.0mmor
more between phases.
6. Checktoensurethattheelectricalresistanceismorethan2MΩ,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.
INSTALLATIONINSTRUCTIONS
HO2019292HA
16