Refrigerant Piping Work - Daikin FBQ18PVJU Installation Manual

CAUTION
• Use the level and check that the unit is installed horizontally.
(4-directions)
• In the case of using a vinyl tube (filled with water) in place of
the level, align the bottom of the unit to the water surface at
both edges of the vinyl tube to make levelness adjustment.
If the unit is installed at a slant with the drain pipe side set
high, in particular, the float switch will not operate normally
and water leakage may result.
6.

REFRIGERANT PIPING WORK

〈As for the refrigerant piping of the outdoor unit, refer to the
installation manual provided to the outdoor unit.〉
〈Perform heat insulation work on both gas piping and liquid
piping, or otherwise water leakage may result.〉
〈Use the insulation material that withstands a temperature
of 250°F.〉
〈Reinforce the insulation material for the refrigerant piping if
the ambient temperature is high, or otherwise dew conden-
sation may result on the surface of the insulation material.〉
〈Make sure that the refrigerant is R410A before refrigerant
piping work. If the refrigerant is different, the air condi-
tioner will not operate normally.〉
CAUTION
This product uses new refrigerant (R410A) only. Be sure to
keep the following items and conduct the installation work.
• Use a dedicated pipe cutter and flare tool for R410A.
• When connecting the flare, apply ether oil or ester oil
only to inner side of the flare.
• Be sure to use the flare nut provided with the unit. (Do
not use a different flare nut (such as a type-1 flare nut),
or otherwise refrigerant leakage may result.)
• Perform the curing of the piping with pinching or taping
of the piping in order to prevent the intrusion of dirt, dust,
and moisture into the piping.
CAUTION
• Be sure to use the specified type of refrigerant for the
refrigeration cycle and do not contaminate the refrigerant
with air.
• Ventilate the room in case of refrigerant leakage during
installation work.
English
(1) Connect the piping.
• The outdoor unit is filled with refrigerant.
• When connecting or disconnecting piping to or from the
unit, be sure to use a spanner and a torque wrench.
(Refer to Fig. 4)
Torque wrench
Flare nut
• Refer to Table 1 for the processing dimensions of the
flare.
• Use the flare nut provided with the unit.
• Apply ether oil or ester oil only to inner side of the
flare and screw in the flare nut three to four turns first by
hand at the time of connecting the flare nut.
(Refer to Fig. 5)
Apply ester oil or ether oil
only to inner side of flare.
• Refer to Table 1 for the corresponding tightening torque.
Table 1
Flare
Pipe
Tightening torque dimensions
size
A (in.)
φ 1/4 10.4 – 12.7 lbf·ft
0.342 – 0.358
φ 3/8 24.1 – 29.4 lbf·ft
0.504 – 0.520
φ 1/2 36.5 – 44.5 lbf·ft
0.638 – 0.654
φ 5/8 45.6 – 55.6 lbf·ft
0.760 – 0.776
CAUTION
• Do not excessively tighten the flare nut.
Doing so will break the flare nut and refrigerant leakage may
result.
• Make sure that all parts around the flare are free of oil.
The drain pan and the resin part may be deteriorated if oil is
attached.
• If no torque wrenches are available, refer to Table 2 as a
standard.
When the flare nut is tightened with the spanner, the
tightening torque should increase suddenly. Tighten the
flare nut further for the corresponding angle shown in
Table 2.
Spanner
Piping union
Fig. 4
Fig. 5
Flare shape
R0.016-0.031
7