Gree GC201808-III, Service Manual

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GREE GMV5 HR HEAT RECOVERY UNITS
45
(2) Selection for the communication cable between the indoor unit and wired controller:
Material type
Total length of
communication line
between IDU unit and
wired controller L m(feet)
Wire size Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
L≤250(820-1/5)
2×AWG18~
2×AWG16
1. Total length of communication line can't exceed 250m
(820-1/5feet).
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.
NOTE: All of the selected communication wire must be consistent with local laws and
regulations.
2.3 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.
2.4 Other requirements
Properties of the above-mentioned materials and the rest of materials that are used for the
construction and installation must comply with local rules and regulations.

Wall thickness of copper pipe shall be consistent with above requirements and the design
operating pressure shall not be lower than 3.8MPa (551psi). But if local authority has a higher
requirement, please design and construct according to local safety standards.

Materials of communication cable shall be consistent with above requirements. If there is
conflict between these requirements and local relevant standards, please contact the
corresponding distributor and confirm it with headquarter.

The parallel distance between communication cable and strong current line shall be above
200mm. Communication cord must not cross with the strong current line.
PART 3 INSTALLATION SPACE
REQUIREMENT
1 PLACE SELECTION FOR INSTALLING ODU
The widely-used VRF units are applicable for various scenarios. In residential areas, especially in
rooms where elderly and infants live, a higher refrigerating performance and noise control is required.
Therefore, the ODU with excellent capacity and low noise is preferred; in addition, ODU should be
installed in outdoor spaces instead of in bedrooms, studies or meeting rooms. In commercial areas, ODU
should be installed far away from offices.