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Refrigerant piping can be connected from 3 directions.
• In case of upward piping, remove the piping penetration
cover, make holes for penetrating piping by cutting the
cover with a cutter such as scissors.
After having the piping go through the cover, attach the
cover to the indoor unit. (Refer to Fig. 19)
Electric wiring
Drain
Fig.19
• The refrigerant is pre-charged in the outdoor unit.
• Use the flare nut attached to the air conditioner.
• When making a flare connection, coat the flared inner sur-
face only with either oil or ester oil. (Refer to Fig. 20)
Then, turn the flare nut 3 to 4 times with your hand and
screw in the nut.
Coat the flared inner surface only with
either oil or ester oil.
Fig. 20
CAUTION
Do not have oil adhere to the screw fixing part of resin
parts.
If oil adheres, it may weaken the strength of screwed part.
• When connecting the piping to the air conditioner, make
sure to use a spanner and a torque wrench as shown in
Fig. 21.
For the dimension of flared part and the tightening torque,
refer to the Table 1.
Torque wrench
Flare nut
Union joint
Example of unfavorable consequences
When tools other than spanners are used, the thread ridge of
a flare nut will be damaged and cause gas leakage due to
defective tightening.
9
Piping penetration cover
Gas
Liquid
Spanner
Fig. 21
Table 1
Dimension for
Piping size
Tightening
processing
(mm)
torque (N·m)
flare A (mm)
6.4
15.7 ± 1.5
8.9 ± 0.2
9.5
36.3 ± 3.6
13.0 ± 0.2
12.7
54.9 ± 5.4
16.4 ± 0.2
15.9
68.6 ± 6.8
19.5 ± 0.2
CAUTION
Do not tighten flare nuts too tight.
If a flare nut cracks, the refrigerant may leak.
• If there is no torque wrench, use Table 2 as a rule of
thumb.
When tightening a flare nut with a spanner harder and
harder, there is a point where the tightening torque sud-
denly increases.
From that position, tighten the nut additionally the angle
shown in Table 2.
After the work is finished, check securely that there is no
gas leak.
If the nut is not tightened as instructed, it may cause slow
refrigerant leak and result in malfunction (such as does
not cool or heat).
Table 2
Piping size
Tightening angle
(mm)
6.4
60° – 90°
9.5
60° – 90°
12.7
30° – 60°
15.9
30° – 60°
CAUTION
Insulation of field piping must be carried out up to the
connection inside the casing.
If the piping is exposed to the atmosphere, it may cause
sweating, burn due to touching the piping, electric shocks or
a fire due to the wiring touching the piping.
Flare shape
R0.4-0.8
Recommended arm length of
tool used
Approximately 150mm
Approximately 200mm
Approximately 250mm
Approximately 300mm
English
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