Daikin FCA71AV16, Installation Manual

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6. REFRIGERANT PIPING WORK
• For the outdoor unit refrigerant piping, refer to the installation manual attached to the outdoor unit.
• Carry out insulation of both gas and liquid refrigerant piping securely. If not insulated, it may cause water
leakage. For gas piping, use insulation material of which heat resistant temperature is not less than 120 °
C.
For use under high humidity, strengthen the insulation material for refrigerant piping. If not strengthened,
the surface of insulation material may sweat.
• Before installation work, make sure that the refrigerant is R32. (Unless the refrigerant is R32, the normal
operation cannot be expected.)
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WARNING-----------------------­
When flared joints are reused indoors, the flare part shall be re-fabricated.
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CAUTION
This air conditioner is a dedicated model for new refrigerant R32. Make sure to meet the
requirements shown below and carry out installation work.
• Use dedicated piping cutters and flaring tools for R32 and R410A.
• When making a flare connection, coat the flared inner surface only with ether oil or ester oil.
• Use only the flare nuts attached to the air conditioner. If other flare nuts are used, it may cause
refrigerant leakage.
• To prevent contamination or moisture from getting into the piping, take measures such as
pinching or taping the pipings.
Do not mix substance other than the specified refrigerant such as air into the refrigeration circuit.
If the refrigerant leaks during the work, ventilate the room.
• The refrigerant is pre-charged in the outdoor unit.
• When connecting the pipings to the air conditioner, make sure
to use a spanner and a torque wrench as shown in Fig. 14.
• For the dimension of flared part and the tightening torque,
refer to the Table 3.
• When making a flare connection, coat the flared inner
surface only with ether oil or ester oil. (Refer to Fig. 15)
Then, turn the flare nut 3 to 4 times with your hand and
screw in the nut.
Table 3
Piping size Dimension for
Torque wrench
Union joint
Fig. 14
Coat the flared inner surface
only with ether oil or ester oil
- � - -=±
Fig. 15
(mm)
Tightening torque (N-m)
processing flare A (mm)
Flare shape
<I> 6.4 15.7±1.5
8.9 ± 0.2
<!>9.5 36.3 ± 3.6 13.0 ± 0.2
<I> 12.7
54.9 ± 5.4 16.4 ± 0.2
<I> 15.9
68.6 ± 6.8 19.5 ± 0.2
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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.
Do not tighten flare nuts too tight.
If a flare nut cracks, the refrigerant may leak.
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