Gree GMV-224WM/B-X, Service Manual

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GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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Part 2 Material Selection
I. 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.
II. Requirement for Selecting Major Materials
1. Copper pipe
a. Material requirement: Dephosphorization drawing copper pipe for air conditioners
b. Appearance requirement: The inner and outer surface of pipe should be smooth without pinhole,
crack, peeling, blister, inclusion, copper powder, carbon deposition, rust, dirt or severe oxide film, and
without obvious scratch, pit, spot and other defects.
c. Test report: Certifications and quality test reports must be provided.
d. The tensile strength must be at least 240 kgf/mm².
e. Specifications requirement
R410A Refrigerant System
OD (mm/inch) Wall Thickness (mm) Model
Φ
6.35(1/4)
≥0.8
0
Φ
9.52(3/8)
≥0.8
0
Φ
12.70(1/2)
≥0.8
0
Φ
15.9(5/8)
≥1.0
0
Φ
19.05(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
f. 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. Condensate water pipe
a. Pipes that can be used for air conditioner drainage include: water supplying UPVC pipe, PP-R