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Ultra Heat GMV VRF Technical Service Manual INSTALLATION
25
Material Type
Total Length L(m) of
Communication Cable
between IDU Unit and IDU
(ODU ) Unit m(feet)
Wire size Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
L≤1000(3280-5/6) ≥2×AWG18
1) If the wire diameter is enlarged to 2 ×AWG16, the
total communication length can reach 1500m (4921-
1/4feet). 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.
(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.