Panasonic Urban Multi MX1 Series Manual page 37

PACD011001G2 / PACD011004G3
When using high static pressure indoor units the fan motors must have a large capacity. Single phase
220~240V branch circuits are therefore required for each indoor unit.
Example: Up to 10 × 2.5HP indoor units or 5 × 5HP indoor units can be wired together.
b) The outdoor unit circuit breaker
Calculation of load (Refer to local regulation.)
With respect to the calculation of load for motors with special applications such as elevator, air conditioner
and refrigerator motors, not only must the rated current be shown on the name plate of the said motor or
piece of apparatus but it must also included all special characteristics or applications.
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.
Urban Multi Inverter "MX1" Series
A separate circuit breaker must be fitted for each unit.
The motors incorporated into air conditioning system compressors are treated as special motors under
the internal wiring provisions. The values which apply to normal motors are thus somewhat variance
with those which apply to such compressor motors. You are recommended to adhere strictly to the
procedures laid down in the technical materials included in, for example, the system design manuals.
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.)
Spacing (d)
10A or less
50A
100A
100A or more
300mm
500mm
1000mm
1500mm
Installation 1
37