GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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2.2 Requirement for Selecting Major Materials
2.2.1 Copper pipe
a. Material requirement: Dephosphorization drawing copper pipe for air conditioners
b. Appearance requirement: The inner and outer surface of pipe should be smooth without pinhole,
crack, peeling, blister, inclusion, copper powder, carbon deposition, rust, dirt or severe oxide film,
and without obvious scratch, pit, spot and other defects.
c. Test report: Certifications and quality test reports must be provided.
d. The tensile strength must be at least 240 kgf/mm².
e. Specifications requirement
R410A Refrigerant System
OD (mm)
Wall Thickness (mm)
Model
Φ6.35
≥0.8
O
Φ9.52
≥0.8
O
Φ12.7
≥0.8
O
Φ15.9
≥1.0
O
Φ19.05
≥1.0
1/2H
Φ22.2
≥1.2
1/2H
Φ25.4
≥1.2
1/2H
Φ28.6
≥1.2
1/2H
Φ31.8
≥1.3
1/2H
Φ34.9
≥1.3
1/2H
Φ38.1
≥1.5
1/2H
Φ41.3
≥1.5
1/2H
Φ44.5
≥1.5
1/2H
Φ51.4
≥1.5
1/2H
Φ54.1
≥1.5
1/2H
f. After the inner part of the copper pipe is cleaned and dried, the inlet and outlet must be sealed
tightly by using pipe caps, plugs or adhesive tapes.
2.2.2 Condensate water pipe
a. Pipes that can be used for air conditioner drainage include: water supplying UPVC pipe, PP-R
pipe, PP-C pipe, and HDG steel pipe.
b. All relevant certificates and quality test reports are provided.
c. Requirements for specifications and wall thickness
d.
Water supplying UPVC pipe: Φ32mm×2mm, Φ40mm×2mm, Φ50mm×2.5mm;
e.
HDG steel pipe: Φ25mm×3.25mm, Φ32mm×3.25mm, Φ40mm×3.5mm, Φ50mm×3.5mm.
2.2.3 Insulation material
a. Rubber foam insulation material;
b. Flame retardancy level: B1 or higher;
c. Refractoriness: at least 120°C;
d. The insulation thickness of condensate water pipe: at least 10 mm;
e.
When the diameter of copper pipe is equal to or greater than Φ15.9 mm, the thickness of
insulation material should be at least 20 mm; when the diameter of copper pipe is less than 15.9
