8
English
•
When connecting the flare nut, coat the flare both inside and outside with ester oil or ether oil and initially
tighten by hand 3 or 4 turns before tightening firmly.
•
Refer to the Table 1 to determine the proper tightening torque.
Table 1
NOTE
The flare nuts used must be those included with the main body.
CAUTION
Over-tightening may damage the flare and cause a refrigerant leakage.
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 fol-
low the installation method mentioned below.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque sud-
denly increases. From that position, further tighten the flare nut the angle shown below:
Table 2
After the work is finished, make sure to check that there is no gas leak.
•
Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas
leakage by thoroughly studying the following figure.
•
Wrap the insulation for fitting (3) (4) around the insulation for the joints on the liquid piping side and the gas
piping side.
(Refer to Fig. 9, 10)
•
When installing the unit onto the ceiling, make sure that the seam between the insulation for fitting (3) (4)
faces up. (Fasten both ends with the clamps (2).) (Fig.9, 10 shows the case of installation on the wall.)
•
Wrap the included sealing pad (5) (6) around the insulation for fitting (3) (4).
(Refer to Fig. 8)
CAUTION
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.
Pipe size
Tightening torque
Flare dimension A (mm)
Flare shape
φ
9.5 (3/8”)
32.7 – 39.9N·m (333 – 407 kgf·cm)
12.8 – 13.2
φ
15.9 (5/8”)
61.8 – 75.4N·m (630 – 770 kgf·cm)
19.3 – 19.7
Pipe size
Further tightening angle
Recommended arm length of tool
φ
9.5 (3/8”)
60 to 90 degrees
Approx. 200mm
φ
15.9 (5/8”)
30 to 60 degrees
Approx. 300mm
A
45
0
Ⳳ
2
0
R0.4-0.8
90
0
Ⳳ
2
0
Ester oil or ether oil
Torque wrench
Spanner
Piping union
Flare nut
3P084604-2A_Eng.fm Page 8 Wednesday, March 3, 2004 10:01 AM
