Daikin REYQ72AATJ Series, Installation Manual

Page: 13 / 51

10 English
7. Refrigerant pipe size and allowable pipe length
7.1. General information
NOTE
The refrigerant R410A requires strict cautions for keeping the system
clean, dry and tight.
• Clean and dry: foreign materials (including mineral oils or moisture)
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• Tight: R410A does not contain any chlorine, does not destroy
the ozone layer, and does not reduce earth’s protection against
harmful ultraviolet radiation. R410A can contribute slightly to the
greenhouse effect if it is released. Therefore we should take special
attention to check the tightness of the installation.
7.2. Selection of piping material
NOTE
Piping and other pressure containing parts shall comply with the appli-
cable legislation and shall be suitable for refrigerant. Use phosphoric
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NOTE
•
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-
cian and must comply with relevant local and national regulations.
• After piping work is complete, do not under any circumstances open
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•
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-
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• Use only pipes which are clean inside and outside and which do not
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other contamination. (Foreign materials inside pipes including oils
for fabrication must be 0.14 gr/10 ft. (30 mg/10 m) or less.)
• Use the following items for the refrigerant piping.
Material :
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Size : See 7.3. Selection of piping size to determine the correct size.
Thickness : Select a thickness for the refrigerant piping which
complies with national and local laws.
•
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height, and length after a branch indicated in the 7.5. System piping
(length) limitations on page 13.
• Outdoor unit multi connection piping kit and refrigerant branch kit
(sold separately) are needed for connection of piping between
outdoor units (in case of multi system) and piping branches.
•
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the outdoor unit multi connection piping kit, the refrigerant branch kit
selection in the 7.4. Selection of refrigerant branch kits on page 11.
7.3. Selection of piping size
Determine the proper size referring to following tables and reference
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A
C* C
a
D
b
1
D
5 6
D D
4 3
1
C
D
8
D
7
D
9
D D
10 11
2
b
B B
x
C C
1 Multi Branch Selector units
2 Single Branch Selector unit
3-11 VRV indoor units
a, b Refrigerant branch kits
Z
Outdoor unit multi connection piping kit
7.3.1.
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branch kit: A, B
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Outdoor unit
capacity type
Piping outer diameter size
Suction gas
pipe
High/low
pressure gas
pipe
Liquid pipe
REYQ72A type
3/4 in.
(19.1 mm)
5/8 in.
(15.9 mm)
3/8 in.
(9.5 mm)
REYQ96A type
7/8 in.
(22.2 mm)
3/4 in.
(19.1 mm)
REYQ120A type
1-1/8 in.
(28.6 mm)
1/2 in.
(12.7 mm)
REYQ144A type
7/8 in.
(22.2 mm)
REYQ168A type
5/8 in.
(15.9 mm)
REYQ192, 216A type
1-1/8 in.
(28.6 mm)
REYQ240A type
1-3/8 in.
(34.9 mm)
REYQ264-336A type
3/4 in.
(19.1 mm)
REYQ360-480 A type
1-5/8 in.
(41.3 mm)
1-3/8 in.
(34.9 mm)
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