Gree GRS-Cm28/NaA-M - Page 37

Chapter Ⅱ Installation（6. Electric Installation）
35
power supply after closing down the unit, otherwise the auto anti-frost protection will be invalid.
6.2 Installation of Power Source
6.2.1 Operating procedures for installing power cord
1）The air source water heater belongs to I class electric appliance, all electric work must be
conducted according to national wiring rules by professional person.
2）The power source must be the power source with rated voltage or special for the unit.
3）The power cord should be set in electric diagram slot or electric wire tube.
4）After the power cord threads through the pass wire orifice, it should install a pass wire
rubber loop to avoid friction between power cord and sheet metal. When the power cord is
connected into electric box of unit, please use rubber or plastic to protect the power cord from
being abraded by sheet metal.
5）There should be reliable fixture for the power cord to prevent the connecting terminal from
being stressed.
6.2.2 Selection for diameter of power cord and air switch
Configuration Table of Power Source
Model
Type of Power
Source
Minimum Sectional Area of Power Cord (mm
2
)
Capacity of Air
Switch
Phase Line
Zero Line
Earth Wire
（A）
GRS-Cm28/NaA-M
GRS-Cm28/NaA1-M
380V-415V 3N
～
50Hz
2.5
2.5
2.5
25
GRS-Cm36/NaA-M
GRS-Cm36/NaA1-M
380V-415V 3N
～
50Hz
4.0
4.0
4.0
32
GRS-Cm53/NaA-M
GRS-Cm53/NaA1-M
380V-415V 3N
～
50Hz
6
6
6
40
Notes:
① The circuit breaker and power cord is selected according to the maximum power
(maximum current) of unit.
②The specification of power cord in the above table is based on providing the using ambient
temperature is 40℃, and is under the conditions that it adopts multi-core copper cable
(such as YJV copper core electric power cable) to arrange in the wire groove with working
temperature of 90℃. If it is not under the aforesaid using conditions, please adjust