VESSER CGU12N, Service Instructions Manual, Page: 70 / 177

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Model
External Diameter Maximum Length
of Connection
Pipe
Maximum
Difference
in Height between
Outdoor and
Indoor Unit
Additional Charge
of Refrigerant
Gas Pipe Liquid Pipe
(m) (m) (g/m)
GU
09N
ij
ij 20 15 15 GU
12N
ij
GU
18N
GU
24N
ij ij
30 15 60
GU
30N
GU
36N
ij ij
50 30 120
GU
36N3
GU
42N3
GU
48N3
GU
60N3
4 ELECTRIC WIRING WORK
4.1 Wiring Principle
4.1.1General
‹ Perform wiring of the power supply in conformance with the regulations of the local electric company.
‹ For the control wires connecting indoor units, and between indoor and outdoor units, use of double-core
shield wires is recommended to prevent noise trouble.
‹ Be sure to set the earth leakage breaker and the switches to the power supply section of the indoor unit.
‹ Supply power to each outdoor unit and provide an earth leakage breaker or hand switch for each outdoor
unit.
‹ Store wiring system for control and refrigerant piping system in the same line.
‹
Arrange the cables so that the electric wires do not come to contact with high-temperature part of the
refrigerant pipe; otherwise coating melts and an accident may be caused.
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‹ Installation should be conducted by National Wiring Regulation.
‹ The rated voltage and exclusive power supply must be adopted for the air conditioners.
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And do not drag the power cable forcibly.
‹ The wire diameter of power cable should be large enough, if power cable and connection wire be
damaged, it should be replaced by the exclusive cable.
‹
All electric installation must be done by professional personnel according to local law, regulation and this
manual.
‹ It should be reliably earthed, and it should be connected to the special earth device, the installation work
should be operated by the professional.
‹ The creepage protect switch and air switch must be installed.
‹ Air switch should have the thermal dropout and magnetic dropout function, in order to avoid the short
circuit and overload.
‹
The on spot connection should refer to the circuit diagram, which is stuck on the unit body.
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‹ Air conditioner is the “I” class electric appliance, thus please do conduct reliable grounding measure.
‹ The yellow-green two-color wiring of air conditioner is grounding wire and cannot be used for other
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‹ The user must offer the reliable grounding terminal. Please don’t connect the grounding wire to the
following places:
a. Water pipe ;