GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
66
Part 7 Electric and Controller Installation
I. Precautions
Both the power cable and communication cable must be connected properly. If the power cable is
connected to the communication port, the main board will be burnt.
The power cable and communication cable can be identified in the following ways:
Method 1: Use sheaths in different colours.
L N
L N
D1 D2 H1 H2
D1 D2 H1 H2
Single-phase unit
Grounding
screw
Warning
Warning
1. Reliable grounding is required.
2. The screw for fixing the conducting
wire must be tightened. It must be
replaced if slipped screw head exists.
3. The external conducting wire must
be fixed by a clip. Otherwise, personal
injury or fire may occur.
1. Reliable grounding is required.
2. The screw for fixing the conducting
wire must be tightened. It must be
replaced if slipped screw head exists.
3. The external conducting wire must
be fixed by a clip. Otherwise, personal
injury or fire may occur.
Power cable
Indoor/outdoor unit
communication D1 D2
Wired controller
H1 H2
Indoor/outdoor unit
communication D1 D2
Wired controller
H1 H2
Power cable
Grounding
screw
Indoor/outdoor
communication cable
Communication cable
of the wired controller
Indoor/outdoor
communication cable
Communication cable
of the wired controller
Color label for the
communication cable
Color label for the
communication cable
Color label for
the power cable
Color label for
the power cable
Three-phase unit
Method 2: Use different types of cables.
The diameter of the power cable is larger than that of the communication cable. Alternatively, adopt three
cores or more for the power cable and two cores for the communication cable.
L N
L N
D1 D2 H1 H2
D1 D2 H1 H2
Single-phase unit
Grounding
screw
Warning
1. Reliable grounding is required.
2. The screw for fixing the conducting wire
must be tightened. It must be replaced if
slipped screw head exists.
3. The external conducting wire must be
fixed by a clip. Otherwise, personal injury
or fire may occur.
Power cable (three-core)
(The yellow green cable
is the ground cable.)
Indoor/outdoor unit
communication D1 D2
Wired controller
H1 H2
Indoor/outdoor
communication
cable (two-core)
Communication
cable of the wired
controller (two-core)
Three-phase unit
Grounding
screw
Power cable (five-core)
(The yellow green cable
is the ground cable.)
Indoor/outdoor
communication
cable (two-core)
Communication
cable of the wired
controller (two-core)
Indoor/outdoor unit
communication D1 D2
Wired controller
H1 H2
Warning
1. Reliable grounding is required.
2. The screw for fixing the conducting wire
must be tightened. It must be replaced if
slipped screw head exists.
3. The external conducting wire must be
fixed by a clip. Otherwise, personal injury
or fire may occur.
Elaborate the method with the installation personnel on site no matter which method is adopted.
II. Installation of the Power Cable
1. Precautions
1) The air conditioning unit is category 1 electrical appliance which requires reliable grounding.
2) The grounding resistance must meet the requirement of local law.
3) The yellow green cable inside the air conditioning unit is a grounding cable. It cannot be used for
other purposes or be cut off. Do not fix it with tapping screws. Otherwise, an electric shock may be
caused.
4) A reliable ground terminal must be provided for the power. Do not connect the grounding cable to
any of the following:
a. Water pipes b. Gas pipes c Drainage pipe d. Other places deemed as unreliable
5) The power cable and the communication cable must be laid separately with a distance of greater
than 20 cm. Otherwise, the communication of the unit will be affection.
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