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NOTE
Failure to follow the above instructions could lead to premature com-
ponent failure.
7. Refrigerant pipe size and allowable pipe length
NOTE
When installing the VRV outdoor unit in combination with the VRV DVS
DOAS air handling unit, refer to the DVS DOAS Installation manual.
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.
When connecting to DOAS units, refer to DOAS Installation Manual.
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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device and installation conditions on page 24 are complete.
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fi r
ic
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r ri
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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 : oi
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or
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 11.
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.
9
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c ori
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oi
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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 10.
7.3. Selection of piping size
Determine the proper size referring to following tables and reference
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D
1
b
E
E
E
3
4
5
6
1
Multi Branch Selector unit
2
Single Branch Selector unit
3-8 VRV indoor units
9,10 DOAS unit
a, b Refrigerant branch kits
Outdoor unit multi connection piping kits
7.3.1.
Piping bet een outdoor units and (first) refrigerant
branch kit: A, B, C
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Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Outdoor unit
Suction gas
capacity type
(19.1 mm)
(22.2 mm)
(28.6 mm)
(34.9 mm)
(41.3 mm)
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B
B
y
A
x
C
a
D
2
b
E
E
E
7
8
a
D
D
9
10
Piping outer diameter size
High/low
pressure gas
Liquid pipe
pipe
pipe
3/4 in.
5/8 in.
(15.9 mm)
(9.5 mm)
7/8 in.
3/4 in.
(19.1 mm)
(12.7 mm)
1-1/8 in.
7/8 in.
(22.2 mm)
(15.9 mm)
1-1/8 in.
1-3/8 in.
(28.6 mm)
1-5/8 in.
1-3/8 in.
(19.1 mm)
(34.9 mm)
3P362438-5N English
o
B
3/8 in.
1/2 in.
5/8 in.
3/4 in.
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