General - Daikin VRV II Series Design, Installation & Testing Instructions

Field Wiring
7.3

General

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Up to 3 units can be connected by crossover power source wiring between outdoor units.
However, units of smaller capacity must be connected downstream. For details, refer to the
equipment design data and technical data.
Make sure to connect the power source wire to the power source terminal block and to
clamp it as shown in figure 14, chapter "Field line connection".
As this unit is equipped with an inverter, installing a phase advancing capacitor not only will
deteriorate power factor improvement effect, but also may cause capacitor abnormal heating
accident due to high-frequency waves. Therefore, never install a phase advancing capacitor.
Keep power imbalance within 2% of the supply rating.
1. Large imbalance will shorten the life of the smoothing capacitor.
2. As a protective measure, the product will stop operating and an error indication will be
made, when power imbalance exceeds 4% of the supply rating.
Follow the "electrical wiring diagram" when carrying out any electrical wiring.
Only proceed with wiring work after blocking off all power.
Always ground wires. (In accordance with national regulations of the pertinent country.)
Do not connect the ground wire to gas pipes, sewage pipes, lightning rods, or telephone
ground wires.
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Gas pipes: can explode or catch fire if there is a gas leak.
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Sewage pipes: no grounding effect is possible if hard plastic piping is used.
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Telephone ground wires and lightning rods: dangerous when struck by lightning due to
abnormal rise in electrical potential in the grounding.
This unit uses an inverter, and therefore generates noise, which will have to be reduced to
avoid interfering with other devices. The outer casing of the product may take on an
electrical charge due to leaked electrical current, which will have to be discharged with the
grounding.
Be sure to install an earth leak detector. (One that can handle higher harmonics.)
(This unit uses an inverter, which means that an earth leak detector capable handling high
harmonics in order to prevent malfunctioning of the earth leak detector itself.)
Earth leak detector which are especially for protecting ground-faults should be used in
conjunction with main switch or fuse for use with wiring.
This unit has a negative phase protection circuit. (If it operates, only operate the unit after
correcting the wiring.)
Si39-303
Installation Manual