Gree GMV MTAC VRF Series, Service Manual

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Gree GMV MTAC VRF for North America
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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.
R410A Refrigerant System
OD (mm/inch) Wall Thickness (mm/inch) Model
Φ 6.35(1/4) ≥0.8(1/32) 0
Φ 9.52(3/8) ≥0.8(1/32) 0
Φ 12.70(1/2) ≥0.8(1/32) 0
Φ 15.9(5/8) ≥1.0(1/25) 0
Φ 19.05(3/4) ≥1.0(1/25) 0
(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:
Φ 15mm×2mm(9/16inch×1/16inch),
Φ 32mm×2mm(1-4/16inch×1/16inch), Φ 40mm×2mm(1-9/16inch×1/16inch),
Φ 50mm×2.5mm(1-15/16inch×2/16inch).
(5) HDG steel pipe: Φ 25mm×3.25mm(1inch×2/16inch),
Φ 32mm×3.25mm(1-4/16inch×2/16inch), Φ 40mm×3.5mm(1-9/16inch×2/16inch),
Φ 50mm×3.5mm(1-15/16inch×2/16inch).
2.3 Insulation Material
(1) Rubber foam insulation material.
(2) Flame retardancy level: B1 or higher.
(3) Refractoriness: at least 120°C(248°F).
(4) The insulation thickness of condensate water pipe: at least 10mm (3/8 inch).
(5) When the diameter of copper pipe is equal to or greater than
Φ 15.9mm (3/4inch), the
thickness of insulation material should be at least 20mm (13/16inch); when the diameter
of copper pipe is less than 15.9mm (3/4 inch), the thickness of insulation material should
be at least 15mm (9/16 inch).