Installation Manual
– 8 –
EN
Refrigerant piping connection
CAUTION
TAKE NOTE OF THESE 4 IMPORTANT POINTS BELOW FOR PIPING WORK
1. Keep dust and moisture away from inside the connecting pipes.
2. Tightly connect the connection between pipes and the unit.
3. Evacuate the air in the connecting pipes using a VACUUM PUMP.
4. Check for gas leaks at connection points.
Pipe connection method
Flaring
1. Cut the pipe with a pipe cutter.
2. Remove the burr inside of the pipe.
When removing the burr, be careful so that chips do not fall into the pipe.
3. Remove the flare nuts attached to the outdoor / indoor unit, then insert them into each of the pipes.
4. Flare the pipes.
See the following table for the projection margin (A) and flaring size (B).
* In case of flaring for R410A with the conventional flare tool, pull the tool out approx. 0.5 mm more than that for R22
to adjust it to the specified flare size.
The copper pipe gauge is useful for adjusting the projection margin size.
Pipe
A
B
Flare Nut
Outside
diameter
Thickness
Rigid
(clutch type)
R410A tool
Imperial
(wing nut type)
R410A tool
Width across
flat
Tighten torque
mm
mm
mm
mm
mm
mm
N•m
kgf•m
6.35
0.8
0 to 0.5
1.0 to 1.5
9.9
17
14 to 18
1.4 to 1.8
9.52
0.8
0 to 0.5
1.0 to 1.5
13.2
22
33 to 42
3.3 to 4.2
12.70
0.8
0 to 0.5
1.0 to 1.5
16.6
26
49 to 61
4.9 to 6.1
15.88
1.0
0 to 0.5
1.0 to 1.5
19.7
29
63 to 77
6.6 to 7.7
90°
Obliquity
Roughness
Warp
A
B
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 two spanners to loosen or tighten the flare nut. If one spanner is used, the required level of
tightening cannot be obtained. Tighten the flare nut with the specified torque.
• Do not apply refrigerant oil to the surface of the flare.
Coupling size of brazed pipe
(Unit: mm)
Connected section
External size
Internal size
Standard outer dia. of
connected copper
pipe
Connected section
Min. thickness of
coupling
External size
Internal size
Min. depth of
insertion
Oval value
Standard outer dia.
(Allowable difference)
C
F
K
G
6.35
6.35 (±0.03)
6.45 (
)
7
6
0.06 or less
0.50
9.52
9.52 (±0.03)
9.62 (
)
8
7
0.08 or less
0.60
12.70
12.70 (±0.03)
12.81 (
)
9
8
0.10 or less
0.70
15.88
15.88 (±0.03)
16.00 (
)
9
8
0.13 or less
0.80
K
ØC
G
ØF
+0.04
-0.02
+0.04
-0.02
+0.04
-0.02
+0.04
-0.02
EN-15
EN-16
2FAN_IM_DB04905901-00.book Page 8 Friday, October 24, 2014 3:19 PM
1
9
.
05
1.0
0 to 0.5
1.0 to 1.5
24
.
0
36
100
to
120
10
to
12
1
9
.
05
1
9
.
05
(±0.03)
11
10
0.1
5
or less
0
.
8
0
1
9
.
19
(
+0
-0.
.
0
0
3
3
)
Содержание MCY-MAP0401TP Series
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