Installation Manual
– 16 –
EN
Selection of refrigerant piping
No.
Piping parts
Name
Selection of pipe size
Remarks
-
Outdoor unit
Connection
Valve
Size of valve
-
(5)
(2)
(4)
(1)
L1
(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
Height
difference
between
indoor and
outdoor
units H1
Gas side
Liquid side
19.05
9.52
(1)
Outdoor unit
1st branching
section
Main pipe
Size of main pipe
0806 type
1006 type
*The main liquid pipe
size differs based on
outdoor unit capacity
type, equivalent length
of main pipe, and hight
difference between
outdoor and indoor
units.
(2)
Branching section
Branching section
Branching
pipe
Pipe size between branching sections
* When exceed the main pipe size, use the same size as
the main pipe.
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.)
(3)
Branching section
Indoor unit
Indoor unit
connecting
pipe
Connecting pipe size of indoor unit
Conditions for size of main pipe
selection*
Size of main
pipe
Height between
indoor and outdoor
units H1(m)
Equivalent
length of main
pipe L1(m)
Gas
pipe
Liquid
pipe
30
≧
H1 > 20
40 > L1
19.05
9.52
L1
≧
40
12.70
20
≧
H1 > 10
60 > L1
9.52
L1
≧
60
12.70
10
≧
H1 > 0
No condition
9.52
Conditions for size of main pipe
selection*
Size of main
pipe
Height between
indoor and outdoor
units H1(m)
Equivalent
length of main
pipe L1(m)
Gas
pipe
Liquid
pipe
30
≧
H1 > 20
30 > L1
22.22
9.52
L1
≧
30
12.70
20
≧
H1 > 10
40 > L1
9.52
L1
≧
40
12.70
10
≧
H1 > 0
50 > L1
9.52
L1
≧
50
12.70
Total capacity codes of
indoor units at down stream
side
Gas pipe
Liquid pipe
Equivalent to
HP
Equivalent to
capacity
Below 2.4
Below 6.6
12.70
9.52
2.4 to below
6.4
6.6 to below
18.0
15.88
9.52
6.4 or more
18.0 or more
22.22
12.70
Capacity rank
Gas pipe
Liquid pipe
005 to 012 type
9.52
6.35
014 to 018 type
12.70
6.35
020 to 056 type
15.88
9.52
EN-31
EN-32
2FAN_IM_DB04307201-04_EN.book Page 16 Tuesday, December 17, 2019 6:34 PM