Gree GMV-N07G/A3A-D(U), Service Manual

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Multi Variable Air Conditioners Indoor Unit for North America
72
(5) Specifications requirement
R410A Refrigerant System
OD (mm/in.) Wall Thickness (mm) Model
Φ6.35(1/4) ≥
0.8
O
Φ9.52(3/8) ≥
0.8
O
Φ12.70(1/2) ≥
0.8
O
Φ15.9(5/8) ≥
1.0
O
Φ19.05(3/4) ≥
1.0
O
(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.
Water supplying UPVC pipe:
Φ32mm×2mm , Φ40mm×2mm, Φ50mm×2.5mm.
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 10mm (3/8in.);
(5)
When the diameter of copper pipe is equal to or greater than Φ15.9mm(5/8in.), the thickness of
insulation material should be at least 20mm(3/4in.); when the diameter of copper pipe is less than
15.9mm(5/8in.), the thickness of insulation material should be at least 15 mm(5/8in.).
2.4 Communication Cable and Control Cable
NOTICE! 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
Material Type
Total Length L (m) of
Communication Cable
between Indoor Unit and
Indoor (Outdoor) Unit
Wire size
(mm
2
/AWG)
Material
Standard
Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L
≤
1000m
（
3280-5/6ft
）
≥
2×0.75(2×AWG
18)
IEC
60227-5
1. If the wire diameter is enlarged to 2×1
mm
2
, the total communication line
length can reach 1500 m.
2. The cord shall be Circular cord (the
cores shall be twisted together).
3. If unit is installed in places with intense
magnetic field or strong interference, it
is necessary to use shielded wire.