Refrigerant Piping Work - Daikin FDMA125AV16 Installation Manual

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CAUTION------------
• Install the indoor unit leveled.
If the indoor unit is inclined and the drain piping side gets
high, it may cause malfunction of float switch and result in
water leakage.
• Attach nuts on the upper and lower side of hanger.
If there is no upper nut and the lower nut is over-tightened,
the hanger and the top plate will deform and cause abnormal
sound.
• Do not insert materials other than that specified into
the clearance between the hanger and the washer for
hanger.
Unless the washers are properly attached, the hanging
bolts may come off from the hanger.
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WARNING-----------
The indoor unit must be securely installed on a place
that can withstand the mass.
If the strength is insufficient, the indoor unit may fall down
and cause injuries.

6. REFRIGERANT PIPING WORK

• For the outdoor unit refrigerant piping, refer to the installation
manual of 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
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.)
- & WARNING
When flared joints are reused in 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.
• 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. 6.
• For the dimension of flared part and the tightening torque,
refer to the Table 2.
• When making a flare connection, coat the flare inner
surface only with ether oil or ester oil.
(Refer to Fig. 7)
Then, turn the flare nut 3 to 4 times with your hand and
screw in the nut.
°
c.
Coat the flared inner surface
only with ether oil or ester oil
1)-a-
Table 2
Piping Tightening
size
torque
(mm) ( N• m)
36.3 ± 3.6
<I> 9.5
68.6 ± 6.8
<I> 15.9
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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.
• If there is no torque wrench, use Table 3 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 at the angle
shown in Table 3.
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).
Table3
Piping size Tightening
(mm)
angle
60 °
<I> 9.5
qi 15.9 30 °
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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.
7
Torque wrench
Spanner
Union joint
Fig.6
Fig.7
Dimension for
processing flare
Flare shape
A(mm)
(!J
13.0 ± 0.2
0�
fl-� 0
g
<(
19.5 ± 0.2
Recommended arm length of
tool used
° approx. 200 mm
- 90
- 60 ° approx. 300 mm
0
R0.4-0.8