Daikin FXMQ-MF Engineering Data page 24

EDUS39-900-F10
Refrigerant Piping Work
<For refrigerant piping between outdoor unit and this unit, see the installation manual attached to the outdoor
unit. (Refer to Table 1)>
<Execute heat insulation work completely on both sides of the gas pipe and the liquid pipe. Otherwise, a water
leakage can result sometimes.>
<Be sure to use insulation that is designed for use with HVAC Systems.>
<Improve the insulation on the refrigerant piping depending on the installation environment. If the insulation is
not sufficient, condensate may form on the surface of the insulation.>
<Before refrigerant piping work, check which type of refrigerant is used. Proper operation is not possible if the
types of refrigerant are not the same.>
CAUTION
 Use a pipe cutter and flare suitable for the type of refrigerant.
 Apply ester oil or ether oil inside the flare portions before connecting. (Refer to Fig. 7)
 To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end or cover it
with tape.
 Do not allow anything other than the designated refrigerant to get mixed into the refrigerant circuit, such as
ir, etc. If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.
 TThe outdoor unit is charged with refrigerant.
 Be sure to use both a spanner and torque wrench together, as shown in the drawing, when connecting or
disconnecting pipes to/from the unit. (Refer to Fig. 8)
 Refer to Table 2 for the dimensions of flare nut spaces.
 When connecting the flare nut, coat the flare section inside with ester oil or ether oil, rotate three or four times first,
then screw in. (Refer to Fig. 7)
 Refer to Table 2 for tightening torque.
Unit to be connected
FXMQ48MFVJU
φ 3/4 Use attached pipe.
FXMQ72MFVJU
φ 7/8 Use attached pipe.
FXMQ96MFVJU
Note:
Use the flare nuts attached with the unit.
CAUTION
Over-tightening may damage the flare and cause a refrigerant leakage.
Ester oil or ether oil.
FXMQ-MF
Table 1
Liquid pipe
Gas pipe diameter
diameter
φ 5/8
φ 3/8
Fig. 7
Table 2
Flare dimen-
Pipe
Tightening torque
sions
size
(ft·lbf)
A (in.)
φ 3/8"
24.1 – 29.4 0.504 – 0.520
φ 5/8"
45.6 – 55.6 0.760 – 0.776
Torque wrench
Spanner
Piping union
Flare nut
Fig. 8
Installation
Flare shape (in.)
R0.016-0.031
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