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Si33-102.book Page 19 Tuesday, June 26, 2001 3:18 PM
SiE33-102
(The nature and amount of the extraneous material inside the pipe can be checked during flushing by
placing a rag lightly over the end of the pipe. In the unlikely case that even a small quantity of moisture is
found then the inside of the pipe should be dried out thoroughly.)
Action:
1. Flush the inside of the pipe with nitrogen gas. (Until such time as the moisture disappears.)
2. Carry out a thorough vacuum drying operation. (See page 29)
Close the main valve on the nitrogen cylinder.
Repeat the above operation for unit B.
When the liquid pipe operations have been completed then do the same with the gas pipes.
Choice of Materials
a) Refrigerant piping
for Refrigerant The piping used must meet the requirements of the JIS standard or equivalent. (Size, material,
Piping
thickness,etc.)
Specification: Oxidized phosphorous seamless copper pipe
Long pipe lengths or coiled pipe (copper pipe with heat insulation coating) should be used to avoid the
necessity for frequent brazing.
The whole job is made easier if rolled copper pipe with a heat insulation coating is used.
Size of Refrigerant Piping
Outside Diameter (mm)
b) Brazed joints and special branches
1. General use (L bend joint, socket joint, T joint, etc.)
Joints must meet the requirements of the relevant JIS standard. (Size, materials, thickness, etc.)
2. Special branches
The Daikin REFNET joint or REFNET header should be used.
Example: R-22 PLUS Series
Refer detail of DAIKIN REFNET joint and REFNET header on page 103.
General Information
Wall Thickness (mm)
6.4 0.8
9.5 0.8
12.7 0.8
15.9 1.0
19.1 1.0
22.2 1.2
25.4 1.2
28.6 1.2
31.8 1.2
34.9 1.3

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Installation
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