Gree GMV-100WL/A-T, Service Manual, Page: 67 / 173

GREE DC Inverter Multi VRF System II Service Manual
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e. Specifications requirement
R410A Refrigerant System
OD (mm/inch) Wall Thickness (mm) Model
Ф 6.35(1/4) ≥0.8 0
Ф 9.52(3/8) ≥0.8 0
Ф 12.70(1/2) ≥0.8 0
Ф 15.9(5/8) ≥1.0 0
Ф 19.05(3/4) ≥1.0 0
Ф 22.20(7/8) ≥1.2 0
Ф 25.40(8/8) ≥1.2 0
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 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
Water supplying UPVC pipe: Ф 32mm×2mm
ˈ
Ф 40mm×2mm
ˈ
Ф 50mm×2.5mm;
HDG steel pipe: Ф 25mm×3.25mm
ˈ
Ф 32mm×3.25mm
ˈ
Ф 40mm×3.5mm
ˈ
Ф 50mm×3.5mm.
2.3 Insulation material
a. Rubber foam insulation material;
b. Flame retardancy level: B1 or higher;
c. Refractoriness: at least 120 ć ;
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 Ф 15.9 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.
2.4 Communication cable and control cable
Note: For air conditioning units installed in places with strong electromagnetic interference, shielded
wire must be used as the communication cables of the IDU and wired controller, and shielded twisted
pairs must be used as the communication cables between IDUs and between the IDU and ODU.
Communication cable selection for ODU and IDUs
Wire Type
Communication Cables
Between IDU and
Indoor (Outdoor) Unit
L(m)
Number of Wire Pieces
x Wire Diameter (mm
2
)
Wire Standard Remark
Common sheath
twisted pair copper
core (RVV)
L İ 1000 ı 2×0.75
GB/T 5023.3-2008
If the wire diameter is
enlarged to 2×1mm
2
,
the overall
communication length
can reach 1500 m.