Multi F Outdoor Unit Engineering Manual

•Onlyqualifiedtechnicians—inaccordancewithfederal,state,andlocalcodes,andmanufacturerproductdiagramsandrequirements—
shouldinstallthepowerwiringandcommunicationcables.
•Useonlycopperwiringthatisstranded,shieldedwiththewiresseparatelyinsulated.
•Donotuseamulti-conductorcablewithmorethanfive(5)wiresinone(1)core.
•PowerwiringandcommunicationscablesizesmustcomplywithapplicablefederalUL/ETL,state,andlocalcodes.
•VerifythatthebranchswitchandcircuitbreakeraresettoOFFbeforeinstallingthewiringsystem.
•Donotoperatetheairconditioningsystemuntiltherefrigerantpipinginstallationiscomplete.Operatingthesystembeforerefrigerant
pipingisfinalizedmaydamagethecompressor.
•Installagroundwirefortheoutdoorunits,indoorunits,andbranchdistributionunits.
•Installamainshutoffswitchorcircuitbreakerthatinterruptsallpowersourcessimultaneously(circuitbreakershouldberesistantto
electromagneticcurrents).
•Toavoidthepossibilityofexplosion,fire,etc.,donotconnectthegroundwiringtogasorsewagepipes,lighteningrods,andtelephone
wires.Useclampstopreventthewiresfromtouchingthepiping.
•Useringterminalstoattachthewiring.Verifythatallpowerwiringandcommunicationscableterminalsaresecurelyattached;ensure
enoughslackisincludedinthewiringandcablestoavoiddamagingtheconnections.
•Useaconduittoprotectthepowerwiring.
•Donotinstallaphase-advancingcapacitor;theoutdoorunitmayoverheat.
General Information
WIRING CONNECTIONS
Power Wiring and Communications Cable Installation
For both Multi F and Multi F MAX systems, power is wired to the outdoor unit only. The outdoor unit will supply power to the branch distribu-
tion units (Multi F MAX systems only) and the indoor units through the power wiring / communications cable.
Figure 91: Power Wiring to Multi F and
Multi F MAX ODU.
Electrical Specifications
1. Multi F and Multi F MAX Outdoor Units: 1Ø, 208-230V, 60Hz
2. Indoor units / Branch Distribution Units (Multi F MAX systems only): 1Ø, 208-230V, 60Hz from
the outdoor unit (Indoor units draw minimal power.)
3. Power supply wire type and size should be selected based on NEC and local codes. Maximum
allowable voltage fluctuation ±10% of the nameplate rated value.
4. Properly ground the outdoor unit per NEC and / or local code.
5. Use only copper wiring that is stranded and shielded with the wires separately insulated.
Power Wiring / Communications Cable Specifications
•From Multi F Outdoor Units to Indoor Units = 4 x 18AWG
•From Multi F MAX Outdoor Units to Branch Distribution Units = 4 x 16AWG
•From Multi F MAX Branch Distribution Units to Indoor Units = 4 x 18AWG
•Maximum Allowable Temperature: 194°F
•Multi F System Maximum Cable Length: 88.6 ft.
•Multi F MAX System Maximum Cable Length:
- Outdoor Unit to Branch Distribution Unit(s): 180.4 ft.
- Branch Distribution Unit(s) to Indoor Unit(s): 49.2 ft.
•Indoor Unit(s) to Wired Controller: Three-core cable
Line voltage
(208/230V)
GN/YL
13/16 inch
GN/YL
13/16 inch
Figure 92: Power Wiring and Communica-
tions Cable from the Multi F ODU to the
IDUs, or from the Multi F MAX ODU to the
BDUs and from the BD Unit to the IDUs.
Due to our policy of continuous product innovation, some specications may change without notication.
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220 | WIRING CONNECTIONS
Multi F and Multi F MAX Heat Pump System Engineering Manual
MULTI
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MAX
MULTI
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