6 InstallationInstaller reference guide18RXF50+60B2_RXF71A2_RXP50~71L2_(A)RXM42~71N2_RXJ50N2_RXA42+50B2R32 split series4P513661-6B – 2018.056.7.2 Precautions when connecting theelectrical wiringINFORMATIONAlso read the precautions and requirements in thefollowing chapters:▪ General safety precautions▪ PreparationDANGER: RISK OF ELECTROCUTIONWARNINGALWAYS use multicore cable for power supply cables.WARNINGUse an all-pole disconnection type breaker with at least3 mm between the contact point gaps that provide fulldisconnection under overvoltage category III.WARNINGIf the supply cord is damaged, it MUST be replaced by themanufacturer, its service agent or similarly qualifiedpersons in order to avoid a hazard.WARNINGDo NOT connect the power supply to the indoor unit. Thiscould result in electrical shock or fire.WARNING▪ Do NOT use locally purchased electrical parts insidethe product.▪ Do NOT branch the power supply for the drain pump,etc. from the terminal block. This could result inelectrical shock or fire.WARNINGKeep the interconnection wiring away from copper pipeswithout thermal insulation as such pipes will be very hot.DANGER: RISK OF ELECTROCUTIONAll electrical parts (including thermistors) are powered bythe power supply. Do not touch them with bare hands.DANGER: RISK OF ELECTROCUTIONDisconnect the power supply for more than 10 minutes,and measure the voltage at the terminals of main circuitcapacitors or electrical components before servicing. Thevoltage MUST be less than 50 V DC before you can touchelectrical components. For the location of the terminals,see the wiring diagram.bcDC P1+DC N1-adegfa Multimeter (DC voltage range)b S80 – reversing solenoid valve lead wirec S20 – electronic expansion valve lead wired S40 – thermal overload relay lead wiree S90 – thermistor lead wiref LEDg S70 – fan motor lead wire6.7.3 Guidelines when connecting the electricalwiringKeep the following in mind:▪ If stranded conductor wires are used, install a round crimp-styleterminal on the end of the wire. Place the round crimp-styleterminal on the wire up to the covered part and fasten the terminalwith the appropriate tool.b aa Stranded conductor wireb Round crimp-style terminal▪ Use the following methods for installing wires:Wire type Installation methodSingle-core wirec bcaaA AA´A´a Curled single-core wireb Screwc Flat washerStranded conductorwire with roundcrimp-style terminalc b ba caBBa Terminalb Screwc Flat washerO AllowedX NOT allowedTightening torquesItem Tightening torque (N•m)M4 (X1M) 1.2~1.3M4 (earth)▪ If single-core wires are used, be sure to curl the end of the lead.Improper work may cause heat or fire.▪ The earth wire between the pull relief and the terminal must belonger than the other wires.1-3