Electrical Wiring - Midea V6R Series Manual

V6R VRF 50/60Hz

9 Electrical Wiring

9.1 General
Notes for installers
Caution
 All installation and wiring must be carried out by competent and suitably qualified, certified and accredited
professionals and in accordance with all applicable legislation.
 Electrical systems should be grounded in accordance with all applicable legislation.
 Overcurrent circuit breakers and residual-current circuit breakers (ground fault circuit interrupters) should be
used in accordance with all applicable legislation.
 Wiring patterns shown in this data book are general connection guides only and are not intended for, or to
include all details for, any specific installation.
 The refrigerant piping, power wiring and communication wiring are typically run in parallel. However, the
communication wiring should not be bound together with the refrigerant piping or power wiring. To prevent
signal interference, the power wiring and communication wiring should not be run in the same conduit. If the
power supply is less than 10A, a separation of at least 300mm between power wiring and communication wiring
conduits should be maintained; if the power supply is in the range 10A to 50A then a separation of at least 500mm
should be maintained.
9.2 Power Supply Wiring
Power supply wiring design and installation should adhere to the following requirements:
 Indoor units or MS boxes in the same system must be powered by the same power supply, in order not to damage the
system.
 Power supply for the indoor units or MS boxes should separate from outdoor units.
 Make sure an electric leakage protection device is installed to prevent electric shocks or fires.
 All the indoor units and MS box in a system (i.e. all the indoor units and MS box connected to the same set of outdoor
units) should be tied into the same power circuit with the same power supply, overcurrent and residual current
protection (leakage protection) and manual switch. Do not install separate protectors or manual switches for each
indoor unit and MS box. Powering on and shutting down all indoor units in a system should be done simultaneously.
The reason for this is that if an indoor unit that is running were to suddenly power off whilst the other indoor units
continued running, the evaporator of the powered-off unit would freeze since refrigerant would continue flowing to
that unit (its expansion valve would still be open) but its fan would have stopped. The indoor units that remain running
would not get sufficient refrigerant so their performance would suffer. Additionally, liquid refrigerant returning directly
to the compressor from the powered-off unit would cause liquid hammering, potentially damaging the compressor.
 To select the size of the power wiring and circuit breaker for the outdoor units, please refer to the Table 2-7.1 in Part
2, 7 "Electrical Characteristics".
 The power, electrical leakage protectors and operation switches for each indoor unit that are connected to the same
outdoor unit and the MS box should be used by both.
 The MS box power wiring should be connected to the terminals with the label "L,N,
 For MS box power wire sizing and circuit breaker sizing, refer to Table 2-7.2 in Part 2, 7 "Electrical Characteristics".
 If HT hydro module connects to the system, please refer to the installation manual of the HT hydro module.
Wiring layout comprises of the power wiring and communication wiring between the indoor, MS box and outdoor units.
These include the earth wiring, and the shielded layer of the earth wiring of the indoor units in the P, Q, E communication
wring. The V6R system wiring overview refer to Figure 2-9.1.
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