Gree GWHD(48S)NM3CO Service Manual page 109

The total length of the liquid pipes: 20+10+10+5+5+5+5+5+5=70(m).
Thus, the total length is over than 30m, so the air conditioner needs to add refrigerant.
Additional refrigerant charge
Σ
the Liquid Pipe Length of Φ6.35×0.022kg/m +
=(5+5+5+5+5+5)(m)×0.022kg/m+(20+10+10)(m)×0.054kg/m-1.47(kg)
=1.35(kg)
4) Additional refrigerant charge record
Diameter(mm)
Φ6.35
Φ9.52
Total
6.10.2 Procedures for adding refrigerant
NO. 1
Name Outdoor unit
NO. 6
Name Hi-knob
1) When the liquid and gas stop valves have not been opened, the system is under the vacuum:
① Refer to the left of the figure; connect the R410A tank to the system.
② Turn on the R410A tank and the Hi-knob; charge the R410A refrigerant into the system from the liquid
side stop valve. The Lo-knob should be closed completely.
③ Turn off the R410A tank and the Hi-knob immediately, when the adding refrigerant is enough.
④ Turn on the liquid and gas side stop valves in an anticlockwise direction slowly and completely.
2) If the pressure of the system is too high to charge refrigerant, you can do as follow.
① Turn on the liquid and gas side stop valves in an anticlockwise direction slowly and completely.
② Turn on the power of the air conditioner, and set cooling mode, running more than 0.5h when outside
temperature is higher than 18℃ DB.
a) Refer to the left of the figure; connect the R410A tank to the system.
b) Turn on the R410A tank and the Lo-knob, charge the R410A refrigerant into the system from the gas
side stop valve. The Hi-knob should be closed completely.
c) Turn off the R410A tank and the Lo-knob immediately, when adding refrigerant is enough.
③ Turn on the power of the air conditioner, and set heating mode, running more than 0.5h when outside
temperature is lower than 18℃ DB.
a) Refer to the right of the figure, connect the R410A tank to the system.
b) Turn on the R410A tank and the Hi-knob, charge the R410A refrigerant into the system from service
port. The Lo-knob should be closed completely.
Σ
Total length(m)
2 3
Service port Liquid side stop valve
7
Lo-knob
the Liquid Pipe Length of Φ9.52×0.054kg/m-1.47(kg)
Additional refrigerant charge(kg)
4
Gas side stop valve
8
R410A tank
Super Free Match
Service Manual
5
Pressure-vacuum
gauge
9
Scale
105 INSTALLATION