Gree GMVVQ224WM/C-X Owner's Manual page 36

5） The length of a straight pipe before the main pipe port of the manifold cannot be less than
500 mm.
6） The length of a straight pipe between the branch of the manifold and the IDU cannot be
less than 500 mm.
3.4.3 Fixation of Manifold
(1) There must be three fixing point for both horizontal and vertical installation of the Y-type
manifold.
Fixing point 1: 100 mm on the main inlet manifold from the welding point.
Fixing point 2: 200 mm on the main branched pipe from the welding point.
Fixing point 3: 250 mm on the branched pipe from the welding point.
(2) The branches of the manifold should be parallel and should not be overlapped.
(3) The liquid pipe and the gas pipe should have the same pipe length and the same laying circuit.
(4) Since the structure of the manifold is relatively complicated, it must be rigorous and careful
for heat preservation to ensure the tight insulation.
3.4.4 Refrigerant Pipe Insulation
(1) Insulation Material Selection
1) Insulation materials should be made of materials that can withstand pipeline temperature:
For heat pump unit, liquid pipe should bear 70℃ or above, and gas pipe should bear 120℃
or above. For cooling only unit, both liquid pipe and gas pipe should bear 70℃ or above.
Example: heat-resistant polyethylene foam (resistant to 120 ℃
polyethylene (resistant to 100℃ or more).
GMV Heat Recovery DC Inverter VRF
Fig.3.4.5
Fig.3.4.6
32
Unit: mm
Unit: mm
or more); foamed