Daikin Super Multi NX 3MXS-G Series Engineering Data page 290

EDUS121131
Selecting a Location for Installation of the Indoor Units
● The maximum allowable length of refrigerant piping, and the maximum allowable height difference between the
outdoor and indoor units, are listed below. (The shorter the refrigerant piping, the better the performance. Connect so
that the piping is as short as possible. Shortest allowable length per room is 9.8 ft.)
Outdoor unit capacity class
Piping to each indoor unit
Total length of piping between all units
Level
Level
difference: 24.6 ft
difference:
max.
49.2 ft max.
If the outdoor unit is positioned higher than the indoor units.
1.
Installing Outdoor Unit
1) When installing the outdoor unit, refer to "Precautions for Selecting the Location" and the "Indoor/Outdoor Unit Installation Drawings".
2) If drain work is necessary, follow the procedures below.
2.
Drain Work
1) Use B drain plug for drainage.
2) If the drain port is covered by a mounting base or floor surface, place
additional foot bases of at least 1-3/16 inch in height under the outdoor unit's
feet.
3) In cold areas, do not use a drain hose with the outdoor unit. (Otherwise,
drain water may freeze, impairing heating performance.)
3.
Refrigerant Piping
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centers Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.
Do not apply refrigeration oil to the flare
nut avoid tightening with over torque.
Installation Manual
Indoor Unit
Outdoor Unit
Outdoor Unit
[Apply oil]
Do not apply refrigeration
Apply refrigeration oil to the
oil to the outer surface.
inner surface of the flare.
Flare nut
Flare nut tightening torque
Flare nut for φ1/4
10.5~12.7 ft-lbf
Flare nut for φ3/8
24.1~29.4 ft-lbf
Flare nut for φ1/2
36.5~44.5 ft-lbf
Flare nut for φ5/8
45.6~55.6 ft-lbf
2MXS18
82 ft max.
164 ft max.
Level
difference:
49.2 ft max.
Level
difference:
24.6 ft max.
Indoor Unit
If the one indoor unit is positioned higher than the outdoor
unit, and other indoor unit is positioned lower than it.
Bottom frame
B Drain plug
Hose (available commercially,
inner dia. 5/8 in)
[Tighten]
Torque wrench
Spanner
Piping union
Flare nut
Valve cap tightening Service port cap
torque tightening torque
Liquid pipe
19.5~23.8 ft-lbf
7.9~10.8 ft-lbf
Gas pipe
35.5~44.0 ft-lbf
Outdoor Unit
Outdoor Unit
Drain-water hole
While pressing
285
2