6. Electrical Wiring
● LOCK ALL ELECTRICAL POWER SUPPLY SWITCHES IN THE OFF POSITION BEFORE INSTALLING
THE UNIT. FAILURE TO DISCONNECT POWER SUPPLY MAY RESULT IN ELECTRICAL SHOCK OR
EVEN DEATH.
● Turn off the main power switch to the Switch Box, the indoor unit and the outdoor unit before
electrical wiring work or a periodical check is performed.
● Insulate electrical wiring, condensate piping, and electrical components from threats posed by
burrowing animals and temperature extremes. Failure to do so can over time, deteriorate system
performance.
● Secure the cables. External forces on the terminals could lead to a fire.
● Be sure to attach the cover so that it fits securely on the electrical box without any gaps.
Secure the cover with screws.
● Tighten screws according to the following torque.
M4: 1.0 to 1.3 N
.
m (0.7 to 1.0 ft
.
lbs) (TB1, TB2, TB3, TB4)
● Wrap the field-supplied insulation around the wires, and plug the wiring connection hole with the
seal material to protect the product from any condensate water or insects.
● Tightly secure the wires with the cable clamp inside the Switch Box.
● Do not connect the ground wiring to the gas pipe, condensate pipe or lightening conductor.
Gas pipe: An explosion and ignition may occur when gas leaks.
Water pipe: There is no effect of ground wiring when a hard vinyl pipe is used.
Lightning conductor: The ground electric potential abnormally increases when a lightning
conductor is used.
6.1GeneralCheck
(1) Makesurethat
thefield-selected electricalcomponents(mainswitches,fuses,ELB(EarthLeakage
Breaker),wires,conduitconnectorsandwireterminals)areproperlyselectedaccordingtothe
electricaldataindicatedinTable6.1.MakesurethatthecomponentscomplywithNationalElectrical
Code(NEC).
(2) Communicationcablemustbeaminimumof18-Gauge,2-Conductor,StrandedCopper.Shielded
cablemustbeconsideredforapplicationsandroutinginareasofhighEMIandothersourcesof
potentiallyexcessiveelectricalnoisetoreducethepotentialforcommunicationerrors.When
shieldedcablingisapplied,properbondingandterminationofthecableshieldisrequiredasper
Hisense/HITACHIguidelines.Plenumandriserratingsforcommunicationcablesmustbeconsidered
perapplicationandlocalcoderequirements.
(3) Useshieldedcommunicationcableforcommunicationcablebetweentheindoorandtheoutdoorunit
(Max.1,000m(3,281ft)),andconnecttheshieldedparttothegroundscrewintheelectricalbox.
(4) Makesurethatthepowersupplyvoltageiswithin±10%oftheratedvoltage.
(5) Checkthecapacityoftheelectricalwiring.Ifthepowersupplycapacityistoolow,thesystemcannot
bestartedduetothevoltagedrop.
(6) Makesurethatthegroundwiringisconnected.
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