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▪ If the power supply lacks an N phase or there is an error in the N phase, the device will malfunction.
▪ Some power equipment may have an inverted phase or intermittent phase (such as a generator). For this type of power
source, a reverse-phase protection circuit should be installed locally in the unit, as operating in the inverted phase may
damage the unit.
▪ Do not share the same power supply line with other devices.
▪ The power cord may produce electromagnetic interference so you should maintain a certain distance from the
equipment that may be susceptible to such interference.
▪ Separate the power supply for the indoor and outdoor units.
▪ For systems with multiple units, make sure a different address is set for each outdoor unit.
5.10.2 Wiring layout
The wiring layout comprises the power cords and communication wiring between the indoor and outdoor units. These include
the earth lines and the shielded layer of the earth lines of the indoor units in the communication line. See below for the wiring
layout of the outdoor unit.
Power supply terminal
X Y E P Q E M1M2 O A H1H2
PQE
Controller
Reserved
Energy Meter
ODU Comm.
IDU Comm.
Communication terminal
Via for communication wiring
Power cord
Communication wiring
Power cords and communication wiring must be laid out separately, they cannot be placed in the same conduit. Use a
●
power supply conduit to isolate if the current of the power supply is less than 10 A. If the current is greater than 10 A
but less than 50 A, the spacing must exceed 500 mm at all times. Otherwise, it may lead to electromagnetic
interference.
Arrange the refrigerant piping, power cords and communication wiring in parallel, but do not tie the communication
●
lines together with the refrigerant piping or power cords.
Power cords and communication wiring should not come in contact with the internal piping so as to prevent the high
●
temperature of the piping from damaging the wires.
Once the wiring layout is completed, close the lid tightly to prevent the wiring and terminals from being exposed when
●
the lid is loose.
NOTE
Via for Power cord
Wire clip
NOTE
39
Power cord
Communication wiring
Figure 5.33
V.1
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