Daikin LCBKQ3AV1, Installation Manual, Page: 7 / 14

English 5
5-1 Selection of Piping Material
• Make sure that the inner side and outer side of the piping used is clean and free of contaminants, such as sulphur, oxide, dust, chips, oil and fat, and water.
It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m.
• Use the following type of refrigerant piping.
Material: Seamless phosphorus deoxidized copper tube (C1220T-O for a maximum outer diameter of 15.9 mm and C1220T-1/2H for a mini-
mum outer diameter of 19.1 mm)
Refrigerant piping size and wall thickness: Decide the size and thickness from the following table.
(This product uses R410A. The withstand pressure of O type may be insufficient if it is used for piping with a minimum diameter of
19.1 mm. Therefore, be sure to use 1/2 H type with a minimum thickness of 1.0 mm.
If O type is used for piping with a minimum diameter of 19.1 mm, a minimum thickness of 1.2 mm will be required. In that case, be
sure to perform the blazing of each joint.)
• Be sure to perform piping work within the range specified in the following table.
<Refrigerant piping size>
<Refrigerant piping length and permissible difference in height>
Refer to the installation manual of the outdoor unit for the indoor unit.
<Example of piping connection>
Piping size (O. D. × min. thickness)(mm) (Note 1)
Liquid piping inlet (Main liquid piping between booster unit and outdoor
unit)
Liquid piping outlet (Between booster unit and refrigeration showcase)
Suction piping (Between booster unit and refrigeration showcase)
Discharge piping (Main gas piping between booster unit and outdoor unit)
(Note 2)
If the size of the connection pipe of the refrigerating showcase exceeds
that of the branch pipe shown in the table on the left, install piping near the
refrigerating showcase.
LCBKQ3AV1(E)
Liquid piping inlet, outlet
(Note 1) (Note 2)
φ
6.4×0.8 (O type)
Suction piping (Note 1)
(Note 2)
φ
15.9×1.0(O type)
Discharge piping
(Note 1)
φ
9.5×0.8(O type)
Max. permissible one way piping length
(equivalent length)
a + b + c + d
≤
130m (d is d1, d2, or e whichever is longer)
Max. branch piping length (actual length)
g
≤
30m (d is d1, d2, or e whichever is longer)
b + f
≤
30m
b + c + d
≤
30m
Between booster unit and refrigeration
showcase (equivalent length)
i
≤
30m
Max. difference in height between booster
unit and refrigeration showcase (refer to the
right figure)
0
≤
H
≤
10m (Refer to the right figure)
Booster
Unit
Showcase
H
Floor
<No. of connection of booster unit>
LRYEQ16AY1
Outdoor unit
a
b
g f
e
d1
i i
d2
c
Indoor unit
(Air-conditioning)
Refrigeration
showcase
Unit cooler
(Refrigeration)
Freezer
showcase
Freezer
showcase
Booster
unit
Booster
unit
Max. no. of connection
of booster unit
2