GM V5 Compact Series VRF Outdoor Unit
19
(5)
Turn off vacuum pump, “LO” knob and “HI” knob, and observe the manometers value. If the pressure value
doesn’t increase in 2 hours, the units don’t exist any leaks and air. If not, please check the units seriously and
find leaks.
4.5.3
Additional Refrigerant Charge
1
）
The refrigerant mass of outdoor unit before installation
Model
Item
GMV-224WL/A-X
GMV-250WL/A-X
GMV-280WL/A-X
The refrigerant mass (kg)
7.2
7.6
7.6
Note:
☆
The refrigerant mass of outdoor unit before installation does n’t include of the refrigerant mass of
connection pipe.
☆
The refrigerant mass of connection pipe is determined by the actual connection pipe length.
2
）
The method of computing the refrigerant mass of connection pipe based on liquid pipe
If the length of
connection pipe is more than 50m, then the refrigerant mass should be charged for every
excess meter.
The refrigerant mass of connection pipe =∑
the length of
liquid pipe × Refrigerant mass for every excess meter
Diameter of liquid pipe
Φ28.6
Φ25.4
Φ22.2
Φ19.05
Φ15.9
Φ12.7
Φ9.52
Φ6.35
Refrigerant mass for every
excess meter
（
kg/m
）
0.680
0.520
0.350
0.250
0.170
0.110
0.054
0.022
After confirming that there is no leakage from the system and compressor is not at operation, charge
additional R410A with specified amount to the unit through the filling opening of the liquid pipe valve of outdoor
unit. If required additional refrigerant cannot be quickly filled because of increase of pipe pressure, then turn on the
units at cooling mode and charge refrigerant from outdoor unit gas valve.
4.6 Electric Wiring
4.6.1 Wiring Precautions
◆
Wiring should conform to national rules. All the parts, materials, electric work should be in accordance with
local codes.
◆
Power supplies of indoor unit and outdoor unit can be uniform or separate, but power supplies of indoor units
must be uniform.
◆
Rated voltage and exclusive power supply should be used.
◆
Power cord should be fixed soundly and reliable. Never forcibly pull the power cord.
◆
Wire size of power cord should be large enough. The damaged power cord and connecting wire should be
replaced by exclusive cable.
◆
All the electrical work should be performed by professional personnel as per local law, regulation and this
manual.
