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WARNING
If the refrigerant gas leaks during installation, ventilate the room. If the leaked refrigerant gas comes into contact with fire, noxious
gas may be generated.
After installation, check that the refrigerant gas does not leak.
If the refrigerant gas leaks into the room and comes into contact with fire such as a fan heater, stove, or kitchen range, noxious gas
may be generated.
REQUIREMENT
For a brazing work of the refrigerant pipes, be sure to use nitrogen gas in order to prevent oxidation of the inside of the pipes;
otherwise clogging of the refrigerating cycle due to oxidized scale may occur.
Use clean and new pipes for the refrigerant pipes and perform piping work so that water or dust does not contaminate the refrigerant.
*Remove all flux after brazing.
Be sure to use a double spanner to loosen or tighten the flare nut. If a single spanner is used, the required level of tightening cannot
be obtained. Tighten the flare nut with the specified torque. (If it is hard to loosen or tighten the flare nut of the balance pipe or
packed valve of the liquid side with a double spanner, loosen or tighten the flare nut while holding the valve mounting plate with a
spanner.)
Extruding margin of copper pipe with flare tools: A
Copper pipe outer dia.
9.5
12.7
15.9
19.1
Extruding margin of copper pipe with flare machining: B
Copper pipe
When using
outer
R410A tool
dia.
9.5 12.7 15.9
0 to 0.5
19.1
When using the conventional flare tool, to connect R410A pipes with flaring, make a margin approx. 0.5 mm longer than that of an
R22 pipe so that the flare size matches the one specified. It is convenient to use a copper pipe gauge for size adjustment of the
extruding margin. Half hard or hard materials may be cracked and may cause leakage of refrigerant when it is flared.
After flaring the connection, be sure the flared part is not damaged, deformed, uneven, or flattened, and that there are no cutting
chips on it. Coupling size of brazed pipe
Standard
External size
outer dia.
Standard outer dia.
of connected
(Allowable difference)
copper pipe
C
6.35
6.35 (±0.03)
9.52
9.52 (±0.03)
12.70
12.70 (±0.03)
15.88
15.88 (±0.03)
19.05
19.05 (±0.03)
22.22
22.22 (±0.03)
28.58
28.58 (±0.04)
34.92
34.90 (±0.04)
38.10
38.10 (±0.05)
41.28
41.28 (±0.05)
(Unit: mm)
+0
A -0.4
13.2
16.6
19.7
24.0
When using
conventional tool
1.0 to 1.5
Connected section
Internal size
Min. depth
of insertion
K
F
(+0.04
6.45
7
-0.02)
(+0.04
9.62
8
-0.02)
(+0.04
12.81
9
-0.02)
(+0.04
16.00
9
-0.02)
(+0.03
19.19
11
-0.03)
(+0.03
22.36
11
-0.03)
(+0.06
28.75
13
-0.02)
(+0.04
35.11
14
-0.04)
(+0.08
38.31
15
-0.02)
(+0.08
41.50
15
-0.02)
(Unit: mm)
B
Min.
thickness
Oval value
of coupling
G
6
0.06 or less
0.50
7
0.08 or less
0.60
8
0.10 or less
0.70
8
0.13 or less
0.80
10
0.15 or less
0.80
10
0.16 or less
0.82
12
0.20 or less
1.00
13
0.25 or less
1.20
14
0.27 or less
1.26
14
0.28 or less
1.35
[10]
Connected section
External size
Internal size
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