20
3
Refrigerant piping design
3-3.
Selection of refrigerant piping
Selection of refrigerant piping
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(1)
Outdoor unit
1st branching
section
Main pipe
Size of main pipe
Same as connecting
pipe size of the outdoor
unit.
(2)
Branching section
Branching section
Branching
pipe
Pipe size between branching sections
Pipe size differs based
on the total capacity
code value of indoor
units at the downstream
side. If the total value
exceeds the capacity
code of the outdoor unit,
apply the capacity code
of the outdoor unit. (See
Table 1 and 2.)
(5)
(2)
(4)
(1)
(3)
(3)
(3)
(3)
(2)
(4)
(3)
(3)
Outdoor unit
Liquid pipe
Gas pipe
Main pipe
1st branching
section
Branching
pipe
Branching
header
Indoor
unit
Indoor
unit
Branching
pipe
Y-shaped
branching joint
Outdoor unit capacity type
Gas pipe
Liquid pipe
0367 type
Ø5/8"
Ø3/8"
0487 type
Ø5/8"
Ø3/8"
0607 type
Ø3/4"
Ø3/8"
Total capacity codes of
indoor units at down stream
side
Gas pipe
Liquid pipe
Equivalent to capacity
23 to below 61
Ø5/8"
Ø3/8"
Ø3/4"
Ø3/8"
61 or more
Ø1/2"
Ø3/8"
Below 23
E16-3P1_databook.book Page 20 Tuesday, December 20, 2016 3:02 PM