GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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G. The liquid pipe and gas pipe must have the same length and be laid in the same route.
H. The manifold has an attached pipe used to adjust the diameter of different pipes. If the pipe size
on site does not match the size of the manifold junction, use the pipe cutter to cut at the middle of
the pipe and remove burrs. Then insert the copper pipe to proper depth. A concave bag for
positioning is available to the manifold purchased from Gree.
I. Because the manifold structure is complex, perform with care to ensure tight insulation.
(7) Pipe Cleaning by Nitrogen
Before connecting the flare opening of the pipe to the IDU, connect the pressure regulator valve on
the nitrogen cylinder to the liquid pipe in the outdoor pipe system. Regulate the nitrogen pressure to
about 5 kgf/cm² and blow nitrogen into the pipe for 1 minute. Repeat this operation for three times till the
dirt and water are discharged. After cleaning the liquid pipe, perform the same operation to clean the gas
pipe.
Leave the pipe disconnected
from the indoor unit temporarily.
Leave the pipe disconnected
from the indoor unit temporarily.
Indoor unit
Indoor unit
Gas pipe
Liquid pipe
Nitrogen
Perform an air-tightness test and a vacuum test to the entire refrigerant pipe system after the
construction is finished.
There must be a secure distance between pipes. Pipes in different types must be fixed separately.
(8) During refrigerant pipe installation, ensure a distance above 500 mm between the pipe and the
electric box of the unit for maintenance. In a case when the space is not enough, the final piping
way must be determined by the technical personnel.
