Refrigerant Piping Work - Daikin VRV IV Series Installation Manual

NOTE
• The Branch Selector unit has a top and a bottom, so install it so that the diagonal lines in the Fig. 4 are
where the top is. (Failing to do so may prevent the unit from operating properly and increase the volume
of the operating noise.)
(Rotate 180 degrees)
6)
2)
1)
Control box cover
1)

5. REFRIGERANT PIPING WORK

• For instruction for installing piping between the outdoor unit and Branch Selector unit, selecting a refrig-
erant branch kit, and installing piping between the refrigerant branch kit and the indoor unit, refer to the
installation manual and equipment design materials included with the outdoor unit.
• Before beginning the work, be sure to verify that the type of refrigerant used is R410A. (The unit will not
operate correctly with a different type of refrigerant.)
• Insulate all of the piping, including the liquid pipes, high/low pressure gas pipes, suction gas pipes, gas
pipes, and the pipe connections for these.
Not insulating these pipes could result in water leaks or burns.
In particular, low-temperature gas flows in the high/low pressure gas piping during full cooling operation,
so the same amount of insulation as used for the suction gas pipes is required.
In addition, high-temperature gas flows in the high/low pressure gas piping and gas piping, so use insu-
lation that can withstand more than 250°F (120°C).
• Select insulation material as necessary for the installation environment.
For details, refer to the Engineering Data Book.
If you fail to do so, condensation could form on the surface of the insulation.
NOTE
• This product only uses the new refrigerant (R410A). Be sure to use the special pipe cutters for R410A,
during installation.
• Make sure that nothing besides the specified refrigerant, such as air, gets into the refrigerant piping.
• If refrigerant gas leaks during the work, ventilate the area. (The outdoor units are filled with refrigerant.)
5-1 Piping material selection
• Use only pipes which are clean inside and outside and which do not accumulate harmful sulfur, oxidants,
dirt, cutting oils, moisture, or other contamination. (Foreign materials inside pipes including oils for
fabrica tion must be 9 mg/10 ft. (9 mg/3 m) or less.)
5
3), 7)
3), 7)
4)
3), 7)
4), 6)
Coil cover
2)
2)
Control box
Fig. 4
7)
(Rotate 180 degrees)
Top Panel
3), 7)
9)
8)
9)
8)
5)-2
(Move the
control box)
[Before change 5)-1]
Remove the wire
from the wire clip.
Control box
[After change 5)-3]
Control box
Pass the wire
through the wire clip.
3P405106-10 English