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Multi V S
Outdoor Unit
8. Electrical Wiring
phase protection circuit locally. running the product in reversed phase may break the compressor and
other parts.
•
Use the 2-core shield cables for communication lines. Never use them together with power cables.
•
The conductive shielding layer of cable should be grounded to the metal part of both units.
•
Never use multi-core cable
•
As this unit is equipped with an inverter, to install a phase leading capacitor not only will deteriorate
power factor improvement effect, but also may cause capacitor abnormal heating. Therefore, never
install a phase leading capacitor.
•
Make sure that the power unbalance ratio is not greater than 2%. If it is greater, the unit's lifespan will
be reduced.
•
Introducing with a missing N-phase or with a mistaken N-phase will break the equipment.
■ Precautions when laying power wiring
Use round pressure terminals for connections to the power terminal block.
When none are available, follow the instructions below.
•
Do not connect wiring of different thicknesses to the power terminal block.
(Slack in the power wiring may cause abnormal heat.)
•
When connecting wiring which is the same thickness, do as shown in the figure below.
•
For wiring, use the designated power wire and connect firmly, then secure to prevent outside pressure being
exerted on the terminal block.
•
Use an appropriate screwdriver for tightening the terminal screws. A screwdriver with a small head will strip the
head and make proper tighterning impossible.
•
Over-tightening the terminal screws may break them.
CAUTION
When the 400 volt power supply is applied to "N" phase by mistake, replace inverter PCB and transformer
in control box.
8.1.2 Communication and Power Lines
1. Communication cable
•
Types: shielding cable
•
Cross section: 1.0~1.5mm²
•
Maximum allowable temperature: 60°C
•
Maximum allowable cable length: under 300m
2. Remote control cable
Round pressure terminal
Installation of Outdoor Units
Power wire
23
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