English
10
Table 2
•
Refer to “Table 2” to determine the proper tightening torque.
Not recommendable but in case of emergency
You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may
follow the installation method mentioned below. (Table 3)
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten the flare nut the angle shown below: (Table 3)
After the work is finished, make sure to check that there is no gas leak.
Table 3
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
“Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing filler metal
(BCuP-2: JIS Z 3264/B-Cu93P-710/795: ISO 3677) which does not require flux.”
(Flux has extremely harmful influence on refrigerant piping systems. For instance, if the chlorine based flux is
used, it will cause pipe corrosion or, in particular, if the flux contains fluorine, it will damage the refrigerant oil.)
•
When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution
(NOTE 1) or while inserting nitrogen into the refrigerant piping (NOTE 2). Once this is done, connect the
indoor unit with a flared or a flanged connection.
NOTES
1.
Refer to the “Manual for Multi Installation for Buildings” for directions on how to carry out nitrogen
substitution. (Inquire with your dealer.)
2.
Nitrogen should be set to 0.02 Mpa (0.2 kg/cm
2
) with a pressure-reducing valve if brazing while inserting
nitrogen into the piping.
(Refer to Fig. 14)
Pipe size
Further tightening angle
Recommended arm length of tool
φ
6.4 (1/4”)
60 to 90 degrees
Approx. 150mm
φ
9.5 (3/8”)
60 to 90 degrees
Approx. 200mm
φ
12.7 (1/2”)
30 to 60 degrees
Approx. 250mm
φ
15.9 (5/8”)
30 to 60 degrees
Approx. 300mm
Type of refrigerant
Applicable model
Flare dimensions A (mm)
R22, R407C
FAY-LVE
FAYP-LV1
R410A
FAQ-BUV1B
Pipe size Tightening torque
R0.4-0.8
A
90
0
Ⳳ
0.5
0
45
0
Ⳳ
2
0
14.2-17.2 N • m (144-175kgf • cm)
32.7-39.9 N • m (333-407kgf • cm)
49.5-60.3 N • m (505-615kgf • cm)
61.8-75.4 N • m (630-769kgf • cm)
97.2-118.8 N • m (991-1211kgf • cm)
φ
6.4(1/4”)
φ
9.5(3/8”)
φ
12.7(1/2”)
φ
15.9(5/8”)
φ
19.1(3/4”)
Flare
8.6 – 9.0
12.6 – 13.0
15.8 – 16.2
19.0 – 19.4
23.3 – 23.7
8.7 – 9.1
12.8 – 13.2
16.2 – 16.6
19.3 – 19.7
Refrigerant piping
Part to be
brazed
Taping
Pressure-reducing valve
hands valve
Nitrogen
Fig. 14
Nitrogen
01_EN_3P083811-3T.fm Page 10 Friday, September 3, 2004 10:17 AM
