Gree GMV-100WL/A-T, Service Manual

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GREE DC Inverter Multi VRF System II Service Manual
144
1RWH
ķ The refrigerant amount charged before delivery doesn’t include the amount that needs to be added
to indoor units and the connection pipeline.
ĸ Length of connection pipe is decided on site. Therefore the amount of additional refrigerant shall be
decided on site according to the dimension and length of field-installed liquid pipe.
Ĺ Record the amount of additional refrigerant for convenience of after-sales service.
2) Calculation of the amount of additional refrigerant
Calculation method of the quantity of additional refrigerant (based on liquid pipe)
Quantity of additional refrigerant = ∑length of liquid pipe X quantity of additional refrigerant per meter
Quantity of additional refrigerant per meter for liquid pipe
˄
kg/m
˅
Φ 22.2 Φ 19.05 Φ 15.9 Φ 12.7 Φ 9.52 Φ 6.35
0.35 0.25 0.17 0.11 0.054 0.022
Note:First confirm that there is no leakage from the system. When compressor is not working, charge
additional R410a with specific amount to the unit through the filling opening of the liquid pipe valve
of the outdoor unit. If required amount cannot be quickly filled due to pressure increase of the pipe,
then set the unit in cooling startup and fill refrigerant from the low pressure check valve of the
outdoor unit.
3) Calculation example
IDU
No. IDU ķ IDU ĸ IDU Ĺ IDU ĺ
Model
Duct type
GMV-ND72PL/B-T
Duct type
GMV-ND50PL/B-T
Duct type
GMV-ND36PL/B-T
Duct type
GMV-ND25PL/B-T
Liquid pipe:
No. A B C D
Pipe size Φ 9.52 Φ 9.52 Φ 9.52 Φ 6.35
Length 10m 5m 5m 5m
No. a b c d
Pipe size Φ 9.52 Φ 6.35 Φ 6.35 Φ 6.35
Length 3m 3m 2m 1m
Total length of each liquid pipe
Φ 9.52 ˖ A+B+C+a=10+105+5+3=23m
Φ 6.35: D+b+c+d=5+3+2+1=11m
The minimum quantity of additional refrigerant = 23×0.054+11×0.022
˙
1.484kg