Lennox MPA018S4M-*P

52
10. Power Wiring for Outdoor and Indoor Units (Diagrams)
CAUTION
Thisunitmustbeproperlygroundedandprotectedbyacircuitbreaker.Thegroundwirefortheunitmustnotbeconnected
toagasorwaterpipe,alightningconductororatelephonegroundwire.
Do not connect power wires to the outdoor unit until all other wiring and piping connections have been com-
pleted.
Install all wiring at least 3 feet (1 m) away from televisions, radios or other electronic devices in order to avoid the
possibility of interference with the unit operation.
Do not install the unit near a lighting appliance that includes a ballast. The ballast may affect remote control
operation.
WARNING
Isolate the power supply before accessing unit electrical terminals.
Install unit so that unit disconnect is accessible.
Follow all local and national codes, as well as this installation instruction, during installation. Do NOT overload
electricalcircuit,asthismayleadtofailureandpossiblere.
Usespeciedwiringandcabletomakeelectricalconnections.Clampcablessecurelyandmakesurethatcon-
nections are tight to avoid strain on wiring. Insecure wiring connections may result in equipment failure and risk
ofre.Wiringmustbeinstalledsothatallcoverplatescanbesecurelyclosed.
IntheU.S.A.,wiringmustconformwithcurrentlocalcodesandthecurrentNationalElectricCode(NEC).InCanada,wiring
mustconformwithcurrentlocalcodesandthecurrentCanadianElectricalCode(CEC).
Refertounitnameplateforminimumcircuitampacityandmaximumover-currentprotectionsize.
• Allindoorunitsarepoweredbytheoutdoorunit.
• Communicationwiringisdeterminedbytheindoorunitsize.Indoorunits30kandbelowuseonestranded
4-conductorwiretoprovidepowerandcommunication.
Indoorunits36kandaboveuseonestranded3-conductorwiretoprovidepowerandonestranded2-conductorwire
to provide communication.
NOTE: Multi-zone systems use indoor units sizes 24k and below.
• Makeallelectricalpowerwiringconnectionsattheoutdoorunit.
• Useminimumof18GAstrandedwiring.
• Connectwiringfromoutdoorunittoindoorunit.
• Refertounitnameplateforratedvoltage.
• Besuretoreattachallelectricalboxcoversafterconnectionsarecomplete.
• FollowNEC/CECstandardsandalllocalandstatecodesduringwiringinstallation.