Electric System 59
5． Electric Wiring Installations
5.1 Highlights of electrical installation
1) Please separately design the special power of indoor units and outdoor units.
2) The power adopts special circuit, and installs creepage protector and manual switch.
3) The indoor units’ power, creepage protector and manual switch connecting to the same outdoor unit
must be general. All indoor units must be the same circuit, and must simultaneously on or off; otherwise,
system life will seriously effect, and appear the situation not to solve.
4) The communication line between indoor units and outdoor units please use 3 core shielded wiring,
while don’t use the multi core wiring without shielded affect, for the interference is reduced each other
5) Purchased wiring, parts and materials should be in compliance with the local and national regulations.
6) All field wiring construction should be finished by qualified electrician.
7) Air conditioning equipment should be grounded according to the relevant local and national electrical
regulations.
8) Current leakage protection switch should be installed (select current leakage breaker in light of the
1.5-2 times of total loading rated current.)
9) When connecting wiring and wire holder, use cable clamp to fix and make sure no exposure.
10) Refrigerant piping system and wiring system of indoor and outdoor unit belongs to the different
system.
11) Do not connect the power wire to the terminal of signal wire.
12) When power wire is parallel with signal wire, put wires to their own wire tube and remain proper gap
(the current capacity of power wire is: 10A below 300mm, 50A below 500mm).
13) Voltage discrepancy of power wire terminal (side of power transformer) and end voltage (side of unit)
should be less than 2%. If its length could not be shortened, thicken the power wire. Voltage discrepancy
between phases shall not pass 2% rated value and Current discrepancy between highest and lowest
phase should be less than 3% rated value.
5.2 Selection of wiring
1. The selection of wiring area shall in accordance with the requirements below:
1) Voltage loss of wire shall meet the requirement of terminal voltage for normal operation and startup.
2) The wiring current-carrying capacity determined by installed method and environment is not less than
the largest current of unit.
3) Conductor shall ensure the stability of movement and heating.
4) The conductor’s smallest sectional area should satisfy the requirement of mechanical strength.
When earth protection line (shortly called PE line) is made of material the same as phase line, the
smallest sectional area of PE line should be in accordance with the regulation below:
Sectional area of core to phase lines(mm² )
Smallest sectional area of PE line(mm² )
5.3 Distribution highlights of distribution wiring
1. When distributing wiring, select wirings with different colors for phase line, zero line and protection
earth according to relevant regulations.
2. The power wire and control wire of concealed engineering is prohibited to bind together with
refrigerant piping. It is necessary to pass through wire tube and be distributed separately, and the gap
between control line and power wire should be 500mm at least.
3. When distributing wiring by passing through pipe, the following should be paid attention to:
1) Metal wire tube could be used in indoor and outdoor, but it is not suitable to the place with acid – alkali
corrosion.
2) Plastic wire tube is generally used in indoor and place with corrosion, but it is not suitable to situation
with mechanical damage.
3) The wiring through pipe shall not be in the form with ends jointing. If there must be joint, connection
box should be installed at the corresponding place.
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