D.C. Inverter Multi-variable Modular
25
Refrigerant charging amount B of every module(kg)
②
Module capacity(kW)
IDU/ODU rated capacity
collocation ratio C
①
Quantity of included IDUs
22.4
28.0
33.5
40.0
45.0
50% C 70%
4
0
0
0
0
0
4
0.5
0.5
0.5
0.5
0.5
70% C 90%
4
0.5
0.5
1
1.5
1.5
4
1
1
1.5
2
2
90% C 105%
4
1
1
1.5
2
2
4
2
2
3
3.5
3.5
105% C 115%
4
2
2
2.5
3
3
4
3.5
3.5
4
5
5
115% C 135%
4
3
3
3.5
4
4
4
4
4
4.5
5.5
5.5
For example:
The OUD is composed of 3 modules: GMV-280WM/B-X, GMV-400WM/B-X, and GMV-450WM/
B-X. The IDUs are made up of 8 sets of GMV-ND140PLS/A-T.
IDU/ODU rated capacity collocation ratio C= 140×8/(280+400+450)=108%. The quantity of
included IDUs is more than 4 sets. Please refer to the above table.
Refrigerant charging amount B for GMV-280WM/B-X module is 3.5kg
Refrigerant charging amount B for GMV-400WM/B-X module is 5.0kg
Refrigerant charging amount B for GMV-450WM/B-X module is 5.0kg
So, ∑Refrigerant charging amount B of every module=3.5+5.0+5.0=13.5kg
Suppose the Pipeline charging amount A=∑Liquid pipe length×refrigerant charging amount of
every 1m liquid pipe=25kg
Total refrigerant charging amount R=25+13.5=38.5kg
After confirming that there is no leakage from the system, when the compressor is not in operation,
charge additional R410A with specified amount to the unit through the filling opening of the liquid
pipe valve of the outdoor unit. If required additional refrigerant can not be quickly filled for increase
of pressure in the pipe, set the unit at cooling startup and then fill the refrigerant from gas valve of
outdoor unit. If ambient temperature is low, the unit can’t be set to cooling mode but heating mode.
4.5 Electric Wiring
4.5.1 Wiring precautions
Wiring should conform to national rules. All the parts, materials, electric work should be in
accordance with local codes.
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.
Connect the unit to the special earthing device and make sure the unit is earthed soundly.
Air switch and circuit breaker is required to be set. Air switch should have both magnetic trip
and thermal trip functions so as to protect the unit when short-circuit and overload happens. D-type
breaker is adviced to be used.
Wiring diagram attatched on the unit is prevailed.
4.5.2 Wiring of power cord
Every unit should have corresponding short-circuit and overload protection. And also a main
switch is required to control power supply or disconnection. See Fig.35.
