Gree Ultra Heat GMV-VQ72W/A-F, Service Manual, Page: 33 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
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PART 2 MATERIAL SELECTIONS
1 REQUIREMENT FOR SELECTING CONSTRUCTION MATERIALS
The materials, equipment and instruments used during air conditioning engineering construction
must have certifications and test reports.
Products with fireproof requirements must be provided with fireproof inspection certificates and must
meet national and relevant compulsory standards.
If environmentally-friendly materials are to be used as required by customers, all such materials
must meet national environmental protection requirement and be provided with relevant certificates.
2 REQUIREMENT FOR SELECTING MAJOR MATERIALS
2.1 Copper Pipe
R410A Refrigeration System
Outer diameter (mm/inch) Wall thickness (mm) Type
Φ6.35(1/4) ≥0.8
0
Φ9.52(3/8) ≥0.8
0
Φ12.70(1/2) ≥0.8
0
Φ15.9(5/8) ≥1.0
0
Φ19.05(3/4) ≥1.0
0
Φ22.2(7/8) ≥1.2
1/2H
Φ25.40(1/1) ≥1.2
1/2H
Φ28.60(9/8) ≥1.2
1/2H
Φ31.80(5/4) ≥1.3
1/2H
Φ34.90(11/8) ≥1.3
1/2H
Φ38.10(12/8) ≥1.5
1/2H
Φ41.30(13/8) ≥1.5
1/2H
Φ44.5(7/4) ≥1.5
1/2H
Φ51.4(7/4) ≥1.5
1/2H
Φ54.1(17/8) ≥1.5
1/2H
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 Communication Cable and Control Cable
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.
(1) Selection for the communication cables of outdoor unit and indoor unit: