Gree GMV-450WM/B-X - Page 63

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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Fixing point 3
hanger rod
Fixing point 2
hanger rod
Welding point 3
Welding
point 2
Welding
point 1
Fixing point 1
hanger rod
Branches of a manifold must be laid parallel and cannot be wrapped in superimposed mode.
F. The liquid pipe and gas pipe must have the same length and be laid in the same route.
G. The Y-type 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.
H. Because the manifold structure is complex, perform with care to ensure tight insulation.
3.7 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.