Daikin FTX-N/U Manual page 118

FTX-N/U, FVXS-N, FDMQ-R Series
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 bracket (11).
Unless the washers are properly attached, the
suspension bolts may come off from the hanger.
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
Refer to the installation manual for the outdoor unit also.
• 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 230°F (110°C).
For use under high humidity, strengthen the insulation
material for refrigerant piping. If not strengthened, the
surface of insulation material may sweat.
(1) Flaring the pipe end
1. Cut the pipe end with a pipe cutter.
2. Remove burrs with the cut surface facing downward,
so that the filings do not enter the pipe.
3. P ut the flare nut on the pipe.
4. Flare the pipe.
5. C heck that the flaring has been done correctly.
Cut exactly at right angles.
Set exactly at the position shown below.
A
Die
Flare tool for R410A
Clutch-type
0-0.02in
A
(0-0.5mm)
The flare's inner surface
must be flaw-free.
7
01_EN_3P500432-1.indd 7
Remove burrs
Flaring
Conventional flare tool
Clutch-type Wing-nut type
(Rigid-type) (Imperial-type)
0.04-0.06in 0.06-0.08in
(1.0-1.5mm)
(1.5-2.0mm)
Check
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
WARNING
• Do not apply mineral oil to the flare.
• Prevent mineral oil from getting into the system as
this would reduce the service life of the units.
• Never use piping which has been used for previous
installations. Only use parts which are delivered with this unit.
• Never install a dryer to this R410A unit in order to
guarantee its service life.
• The drying material may dissolve and damage the system.
• Incomplete flaring may result in refrigerant gas leakage.
CAUTION
• Use the flare nut fixed to the main unit. (This is to
prevent the flare nut from cracking as a result of
deterioration over time.)
• Use a pipe cutter and flare suitable for the type of
refrigerant.
• To prevent gas leakage, apply refrigeration oil only to
the inner surface of the flare. (Use refrigeration oil for
R410A.) (Refer to Fig. 10)
• Use a torque wrench when tightening the flare nuts to
prevent damage to the flare nuts and gas leakage.
• Protect the open end of the pipe against dust and moisture.
• Do not allow anything other than the designated
refrigerant to get mixed into the refrigerant circuit, such
as air, etc. If any refrigerant gas leaks while working on
the unit, ventilate the room thoroughly right away.
• Use only the flare nuts attached to the air conditioner. If
other flare nuts are used, it may cause refrigerant leakage.
(2) Refrigerant piping
1. To prevent gas leakage, apply refrigeration machine
oil only to the inner surface of the flare. (Use
refrigeration oil for R410A)
2. A lign the centers of both flares and tighten the flare
nuts 3 or 4 turns by hand, then tighten them fully with
a spanner and a torque wrench.
• Use a torque wrench when tightening the flare nuts
to prevent damage to the flare nuts and gas leakage.
(Refer to Fig. 9)
Flare nut tightening torque
Gas side
3/8 inch 1/2 inch
(9.5mm) (12.7mm)
24.1-29.4ft•lbf 36.5-44.5ft•lbf
(32.7-39.9N•m) (49.5-60.3N•m)
116
EDUS091558E
Liquid side
5/8 inch 1/4 inch
(15.9mm) (6.4mm)
45.6-55.6ft•lbf 10.4-12.7ft•lbf
(61.8-75.4N•m) (14.2-17.2N•m)
3P500432-1
10/24/2017 18:32:33