DC Inverter Side Discharge VRF Ⅱ for North America
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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.
2.1 Refrigerant piping
(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
(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 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.
2.3 Insulation material
(1) Rubber foam insulation material;
(2) Flame retardancy level: B1 or higher;
(3) Refractoriness: at least 120℃(248℉);
(4) The insulation thickness of condensate water pipe: at least 10 mm;
(5) 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 mm, the thickness of insulation material should be at
least 15 mm.
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