Pressure Check, Vacuum And Additional Refrigerant Charge - Gree GMV5 Compact Series Owner's Manual

4.4.5 Connecting Outdoor Unit Pipe
(1) Turn off bolts, board above unit, board on the front of unit, and the right board.
(2) According to the installation location, the right location of connecting pipes can be one of the four directions.
(3) Then remove the cut-and-dried orifice with electric drill and hammer.
(4) Corrugated pipe and liquid pipe are connected with valves of outdoor unit respectively.
(5) Adjust the bend angle of connecting pipes to let the connecting pipes out easily, and weld corrugated pipe and
liquid pipe.
(6) Seal up the remaining space of the cut-and-dried orifice except connecting pipes with sealant or putty. And do
not leave any space. If not, maybe water, dust, small animals come in unit and lead to malfunction.

4.5 Pressure Check, Vacuum and Additional Refrigerant Charge

4.5.1 Pressure Check
(1) Valves of outdoor unit on the side of gas pipe and liquid pipe are off during pressure check.
(2) Only use nitrogen to check the units.
(3) Turn on booster valve till manometer shows 1.0MPa (10bar), then keep it for 10min to make sure pressure is
not changed.
(4) Turn on booster valve till manometer shows 4.0MPa (40bar), then keep it for 24 hours to make sure pressure
is not changed.
(5) If pressure is not changed, the unit is not leaking. If not, please check the units seriously and find leaks.
GM V5 Compact Series VRF Outdoor Unit
Fig.14 The way of outdoor unit connecting pipe
17
Expansible nut
Gas pipe
Liquid pipe