GREE DC Inverter Multi VRF System II Service Manual
63
e. Specifications requirement
R410A Refrigerant System
OD (mm/inch) Wall Thickness (mm) Model
Ф6.35(1/4) ≥0.8 0
Ф9.52(3/8) ≥0.8 0
Ф12.70(1/2) ≥0.8 0
Ф15.9(5/8) ≥1.0 0
Ф19.05(3/4) ≥1.0 0
Ф22.20(7/8) ≥1.2 0
Ф25.40(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: Ф32mm×2mmˈФ40mm×2mmˈФ50mm×2.5mm;
HDG steel pipe: Ф25mm×3.25mmˈФ32mm×3.25mmˈФ40mm×3.5mmˈФ50mm×3.5mm.
2.3 Insulation material
a. Rubber foam insulation material;
b. Flame retardancy level: B1 or higher;
c. Refractoriness: at least 120ć;
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 Ф15.9 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-
If the wire diameter is
enlarged to 2×1mm
2
,
the overall
communication length
can reach 1500 m.
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