Requirements Of Power Circuit And Cable; Ground Requirements; Precautions Of Electrical Wiring Work - Gree R410A Service Manual

7.2 Requirements of Power Circuit and Cable

Recommended cable of outdoor unit
(Pieces × Sectional area)
Recommended cable of BU module (Pieces × Sectional area)
Transmission line (Pieces × Sectional area)
Recommended cable of indoor unit (Pieces × Sectional area)
Capacity of the air switch
Note:
The total length of the transmission line between the outdoor unit and the furthest BU module is not more
than 55m. Otherwise, the system cannot work possibility.
The specifications of the power cable and transmission line listed in the table above are determined based
on the maximum power (maximum amps) of the unit.
The specifications of the power cable listed in the table above are applied to the conduit-guarded
multi-wire copper cable (like, YJV copper cable, consisting of PE insulated wires and a PVC cable jacket)
used at 40 and resistible to 90
℃
(code designation 60245 IEC 57). If the working condition changes, they should be modified according to
the related national standard.
The specifications of the air switch listed in the table above are applied to the breaker with the working
temperature at 40 . If the working condition changes, they should be modified according to the related
national standard.
The length of the recommended power cable should be less than 15 meters; otherwise,
power cable is not enough.
Mentioned power cable and transmission line length is just a reference value. It may be different
depending on the condition of installation, humidity or materials, etc.
An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be
connected in fixed wiring.

7.3 Ground Requirements

The air conditioner is classified into the Class I appliances, so its ground ways must be reliable.
The ground wire must be fixed on the screw hole with the sign as the right figure.
The yellow-green wire of the air conditioner is the ground wire and must be fixed by the tapping screw.
And it cannot be used for other purpose or cut off. Otherwise, it will cause the hazard of electric shock.
The reliable ground terminal should be provided and the
following places: a.
Other unreliable places considered by a professional.

7.4 Precautions of Electrical Wiring Work

The ground connection should be reliable and the ground wire should be connected to the dedicated
device of the building by the professional.
Phase and frequency
Voltage
℃, and shall be at least those of ordinary polychloroprene sheathed cords
℃
Water pipe; b. Coal gas pipe; c. Sewage pipe; d.
GWHD(48S)NM3CO
GWHD(56S)NM3CO
GWHD(48S)NM3CO
GWHD(56S)NM3CO
BU module
ground wire cannot be connected to any of the
Lightning rod e. Telephone line f.
Super Free Match
Service Manual
3Ph,50Hz
380～415V
2
5×2.5mm
2
3×0.75 mm
2
2×1.5 mm
2
4×0.75mm
25 A
25A
10A
the diameter of the
115 INSTALLATION