Water System Pipe; Floor Heating Pipe; Communication Cable; Communication Cable Selection For Odu And Idus - Gree GMV-S120WL/A-S Service Manual

3.3.2.4 Water system pipe (circulating pipe of hydro box and water inlet and outlet
pipe of water tank)
1）Circulating pipe of hydro box: Hot water pipe must be used. The PPR pipe with outer
diameter DN25 which is S2.5 series (thickness is 4.2mm) is recommended.
2）Water inlet and outlet pipe of water tank: Hot water pipe must be used. The PPR pipe with
outer diameter DN20 which is S2.5 series (thickness is 3.4mm) is recommended.
3）All applied PPR pipes must comply with national standards GB/T18742. If other insulated
pipeline are adopted, the above can be reference.
4）The water system pipes must be insulated. Usually, the thickness of heat insulating
material is 15mm; the outdoor or exposed pipe shall be wrapped for beautiful appearance.

3.3.2.5 Floor heating pipe

1）The floor heating pipe shall comply with level 4 in national standards GB/T 18891.
2）The pipe quality and mechanical property must comply with related national standard.
3）The floor heating pipe shall be with oxygen barrier layer.
4）The operation pressure of floor heating pipe shall not be less than 0.4MPa.
5）Applicable pipe types: PE-RT pipe, PE-X pipe and so on.
6）Pipe size: DN16, DN20 and so on.
7）The distance between two floor heating pipes shall be within 100~150mm.
8）The main floor heating pipe must be insulated. Usually, the thickness of heat insulating
material is 15mm; the outdoor or exposed pipe shall be wrapped for beautiful appearance.

3.3.2.6 Communication 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

Communication Cables
Wire Type
Between IDU and IDU
Common sheath
twisted pair copper
core
Communication cable selection for IDU and wired controller
Total Length of
Communication
Wire Type Cables Between
IDU and Wired
Controller L(m)
Common sheath
twisted pair copper
core
GMV5 Home DC Inverter Multi VRF Units
Total Length of
Number of Wire
Pieces x Wire
Diameter (mm
(ODU) L(m)
L≤1000
Number of Wire
Pieces x Wire
Diameter (mm
L≤250 ≥2×0.75
Wire Standard
2
)
≥2×0.75
GB/T 5023.3-2008
Wire Standard
2
)
GB/T 5023.3-2008
126
Remark
If the wire diameter is
2
enlarged to 2×1mm , the
overall communication
length can reach 1500m.
Remark
The overall communication
length cannot exceed 250m.