Gree GMV-36WL/B-T(U) - Page 22

Ultra Heat GMV5 User Manual
18
(a) (b)
Fig. 22
NO.
1
2
3
4
Name
Outdoor unit
Gas side stop valve
Liquid side stop valve
Pressure-vacuum gauge
NO.
5
6
7
8
Name
Hi-knob
Lo-knob
R410A tank
Scale
Procedures for adding refrigerant
1) When the liquid and gas stop valves have not been opened, the system is under the vacuum:
① Refer to Fig. 22 (a); connect the R410A tank to the system.
② Turn on the R410A tank and the Hi-knob; charge the R410A refrigerant into the unit 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 after the
trial run.
① Turn off all indoor units, then turn off power after the compressor and fans stop;
② After turn off power 5 min, refer to the right of the Fig. 22 (b) connect the R410A tank to the
system, keep the R410A tank and the Lo-knob closing;
③ Turn on the power of the air conditioner, and set cooling mode, running more than 20min;
④ Turn on the R410A tank and the Lo-knob; charge the R410A refrigerant into the unit from the
gas side stop valve.
⑤ Turn off the R410A tank and the Lo-knob immediately when adding refrigerant is enough.
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Caution！
◆ Make sure the liquid and gas side stop valves are opened completely after the installation.
◆ Make sure the length of liquid pipe is exactly.
◆ Additional refrigerant charge must be measured exactly.
◆ Make sure that the refrigerant which charge into the unit is in liquid state.
◆ Please prevent the refrigerant leakage from your body when remove the charging hose.
◆ Please heat the refrigerant tank with hot water or hot air when the outside temperature is too
low. However, it must be forbidden to heat with fire directly, otherwise it may lead to
explosion.
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(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(39-3/8inch)