Midea V8 Series Engineering Data

V8 Mini R410A VRF 50Hz
90
Midea V8 Mini Series Engineering Data Book
8 Electrical Wiring
8.1 General
8.2 Power Supply Wiring
Power supply wiring design and installation should adhere to the following requirements:
 Separate power supplies should be provided for the indoor units and outdoor units.
 Where five or more outdoor units are installed, additional residual current protection (leakage protection) should be
installed.
 All the indoor units in a system (i.e. all the indoor units 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, as shown in Figure 3-8.1. Do not install separate protectors or manual switches for each indoor
unit. 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.
 Indoor units can be powered separate when HyperLink communication is activated, refer to Part3, 8.3.4 “M1 M2
communication”.
 For outdoor unit power wire sizing and circuit breaker sizing, refer to Table 2-6.1 in Part 2, 6 “Electrical Characteristics”.
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.
 Use only wires with copper cores for the connections.
 Wiring must be carried out in strict accordance with what is stated in the product nameplate.

Electrical systems should be grounded in accordance with all applicable legislation. Do not connect the earth
wire to public pipes, telephone earth wires, surge absorbers and other places that are not designed for
grounding. Improper grounding may cause electric shock.

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, if
HyperLink communication is not activated, 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.
Notes for installers
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Midea V8 Series Specifications

General

Brand	Midea
Model	V8 Series
Category	Air Conditioner
Language	English