GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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2 MATERIAL SELECTION
2.1 Requirement for Selecting Construction Materials
The materials, equipment and instruments used during air conditioning engineering construction
must have certifications and test reports.
Products with fireproof requirements must be provided with fireproof inspection certificates and must
meet national and relevant compulsory standards.
If environmentally-friendly materials are to be used as required by customers, all such materials
must meet national environmental protection requirement and be provided with relevant certificates.
2.2 Requirement for Selecting Major Materials
2.2.1 Copper pipe
(1) Material requirement: Dephosphorization drawing copper pipe for air conditioners.
(2) 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.
(3) Test report: Certifications and quality test reports must be provided.
(4) The tensile strength must be at least 240 kgf/mm².
(5) Specifications requirement.
R410A Refrigerant System
Outer Diameter mm(in.) Wall Thickness mm(in.) Type
Φ6.35(1/4) ≥0.8(1/32) O
Φ9.52(3/8) ≥0.8(1/32) O
Φ12.7(1/2) ≥0.8(1/32) O
Φ15.9(5/8) ≥1.0(3/76) O
Φ19.05(3/4) ≥1.0(3/76) 1/2H
Φ22.2(7/8) ≥1.2(1/21) 1/2H
Φ28.6(1-1/8) ≥1.2(1/21) 1/2H
Φ34.9(1-3/8) ≥1.3(2/39) 1/2H
Φ41.3(1-5/8) ≥1.5(1/17) 1/2H
(6) 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
(1) Pipes that can be used for air conditioner drainage include: water supplying UPVC pipe, PP-R
pipe, PP-C pipe, and HDG steel pipe.
(2) All relevant certificates and quality test reports are provided.
(3) Requirements for specifications and wall thickness.
(4) Water supplying UPVC pipe: Φ32mm×2mm, Φ40mm×2mm, Φ50mm×2.5mm.
(5) HDG steel pipe: Φ25mm×3.25mm, Φ32mm×3.25mm, Φ40mm×3.5mm, Φ50mm×3.5mm.
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