Gree GC201808-III, Service Manual

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GREE GMV5 HR HEAT RECOVERY UNITS
44
PART 2 MATERIAL SELECTION
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 Refrigeratn System
Outer diameter mm(in.) Wall thickness mm(in.) Type
Φ6.35(1/4) ≥0.8(1/32)
O
Φ9.52(3/8) ≥0.8(1/32)
O
Φ12.70(1/2) ≥0.8(1/32)
O
Φ15.9(5/8) ≥1.0(3/76)
O
Φ19.05(3/4) ≥1.0(3/76)
1/2H
Φ22.2(7/8) ≥1.2(1/21)
1/2H
Φ28.60(1-1/8) ≥1.2(1/21)
1/2H
Φ34.90(1-3/8) ≥1.3(2/39)
1/2H
Φ41.30(1-5/8) ≥1.5(1/17)
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:
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.