Gree GUHN48NM3A1O - Electric Wiring Work; Wiring Principle

75
U-MATCH Air
Conditioners
Service Manual
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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 /LTXLG3LSH (m) (m) (g/m)
*8+11.$2
ĭ
3/8"
ĭ
1/4"  15 15
*8+11.$2
ĭ
1/2"
ĭ
1/4"  15 15
*8+11.$2
*8+11.$2
ĭ
5/8"
ĭ
3/8"  15 
*8+11.$2
*8+11.$2
ĭ
3/4"
ĭ
1/2"   
GUHN36NM3AO
GUHN42NM3AO
GUHN48NM3A1O
*8+110$2
*8+110$2
GUCN42NM3AO
ĭ
3/4"
ĭ
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GUCN48NM3AO
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4.1 Wiring Principle
4.1.1 General

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;