R410A All DC Inverter Mini VRF
MCAC-VTSM-2016-02
54 Installation
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(mm)
Smallest sectional area of PE line(mm)
S
≤
16
S
16
＜
S
≤
35
16
S
＞
35
S/2
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.
4) The wiring with different voltage should not pass through the same wire tube.
5) Total sectional area of wiring through wire tube shall not exceed 40% valid area of stuffing tube.
6) Fixing point of wire tube support shall follow the standard below:
Normal diameter of wire tube Largest gap between fixed points of wire tube
mm
Metal pipe
Plastic pipe
15~20
1.5m
1m
25~32
2m
1.5m
40~50
2.5m
2m
Summary of Contents for MDV-120W/DON1
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