Daikin VRV II Series Design, Installation & Testing Instructions page 60

Installation
Note:
The rated current for package air conditioners which use special purpose built-in compressor motors in
their compressors in 1.2 times the operating current shown on the name plate.
2. Cable size
The thickness of the cables in the circuits (branch circuits) providing the main power supply to each item of
apparatus must satisfy the following conditions:
1. To have a current tolerance of 40% or more of the rated current of the overcurrent circuit breaker (wiring
2. To have a current tolerance of 125% or more of the rated current in cases where the rated current of the
3. To have a current tolerance of 110% or more of the rated current in cases where the rated current of the
4. To satisfy voltage drop standards.
3. Separation of control and power supply cables
!
Notes:
1. The figures are based on an assumed length of parallel cabling up to 100m. For lengths in excess of
2. If the power supply waveform continues to exhibit some distortion the recommended spacing in the
If the cables are laid inside conduits then the following points must also be taken into account when
grouping various cables together for introduction into the conduits.
1. Power cables (including power supply to the air conditioner) and signal cables must not be laid inside
2. In the same way, when grouping the cables, power and signal cables should not be bunched together.
!
1. Earthing
!
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circuit breaker, etc.).
apparatus is 50A or less.
apparatus is more than 50A.
If control and power cables are run alongside each other then there is a strong likelihood of
operational faults developing due to interference in the signal wiring caused by electrostatic and
electromagnetic coupling.
The table below indicates our recommendations as to the appropriate spacing of control and power
cables where these are to be run side by side.
Current capacity of power cable
100V or more
100m the figures will have to be recalculated in direct proportion to the additional length of cable
involved.
table should be increased.
the same conduit. (Power cables and signal cables must each have their own individual conduits.)
Important points
Have the indoor and outdoor units both been earthed?
If the apparatus is not properly earthed then there is always a risk of electric shocks. The earthing of the
apparatus must be carried out by a qualified person.
Spacing (d)
10A or less
50A
100A
100A or more
300mm
500mm
1000mm
1500mm
General Information
Si39-303