GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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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: Φ32mm×2mm, Φ40mm×2mm, Φ50mm×2.5mm;
HDG steel pipe: Φ25mm×3.25mm, Φ32mm×3.25mm, Φ40mm×3.5mm, Φ50mm×3.5mm.
3. Insulation material
a. Rubber foam insulation material;
b. Flame retardancy level: B1 or higher;
c. Refractoriness: at least 120℃;
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 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.
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 outdoor and IDUs
Total Length of
Communication Cables
Between IDU and Indoor
(Outdoor) Unit L(m)
Number of Wire
Pieces x Wire
Diameter (mm
2
)
Common sheath
twisted pair copper
core (60227 IEC 52
/60227 IEC 53)
If the wire diameter is
enlarged to 2×1mm
2
, the
overall communication
length can reach 1500 m.
Communication cable selection for IDU and wired controller
Total Length of
Communication Cables of
the IDU and Wired
Controller L(m)
Number of Wire
Pieces x Wire
Diameter (mm
2
)
Common sheath twisted
pair copper core (
60227 IEC 52
/60227 IEC 53)
The overall communication
length cannot exceed 250
m.
5. Power cable
Only copper conductors can be used as power cables. The copper conductors must meet relevant
national standard and satisfy the carrying capacity of unit.
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