50
6-3. Piping examples
Classification Branch with Y-joint Branch with Y and Header joint Branch with Header joint
One outdoor unit
installed
Multiple outdoor
units installed
Items Examples Remarks
Max.
piping
length
Outdoor
~
Indoor unit
Piping
(Equivalent
piping)
200m(656
ft
)
220m(722
ft
)
Branch with Y joint
a+b+c+d+e+f+g+p
≤
200(220)m / 656(722)
ft
Equivalent pipe length
Y-joint:0.5m(1.6ft),
Header:1m(3.2ft)
Branch with Y joint
and Header joint
a+i+k
≤
200(220)m / 656(722)
ft
a+b+h
≤
200(220)m / 656(722)
ft
Branch with
header joint
a+i
≤
200(220)m / 656(722)
ft
Total piping
1000m
(3281
ft
)
Branch with Y joint
a+b+c+d+e+f+g+p+h+i+j+k+l+m+n
≤
1000m / 3281
ft
Branch with Y joint
and Header joint
a+b+c+d+e+f+g+p+h+i+j+k
≤
1000m / 3281
ft
Branch with
Header joint
a+b+c+d+e+f+g+p+h+i
≤
1000m / 3281
ft
Outdoor
~
Outdoor unit
Piping 10m(33
ft
) r
≤
10 (33
ft
), s
≤
10 (33
ft
), t
≤
10m (33
ft
)
Equivalent
piping
13m(43
ft
) r
≤
13 (43
ft
), s
≤
13 (43
ft
), t
≤
13m (43
ft
)
Level
difference
Outdoor ~
Indoor unit
Piping
50m(164
ft
)
40m(131
ft
)
H1
≤
50m (164
ft
) / 40m (131ft)
Indoor ~
Indoor unit
Piping 15m(49ft) H2
≤
15m (49ft)
Outdoor ~
Outdoor unit
Piping 5m(16ft) H3
≤
5m (16ft)
Allowable
length
after
branch
The first
branch
~
the farthest
indoor unit
Piping 45m(148ft) b+c+d+e+f+g+p
≤
45 m(148ft), i
≤
45m(148ft)
Piping 90m(295ft) It needs to satisfy required conditions
Only apply
DVM PLUS
III
(DVM PLUS
III
HR
exclusion)
Distribution kit Model Remarks
Allowable
From distribution kit to
indoor unit
3m
(10ft)
MEV-A13SA / MEV-A16SA (For 1 indoor unit)
For wall-mounted &
ceiling indoor unit
From distribution kit to
indoor unit
20m
(66ft)
MXD-A13K116A / MXD-A13K200A / MXD-A16K200A /
MXD-A22K200A (For 2 indoor units)
MXD-A13K216A / MXD-A13K300A / MXD-A16K213A /
MXD-A16K300A (For 3 indoor units)
Required condition Example
The first branch
joint ~
the farthest
indoor unit
If the sum of pipe length (b+c+d+e+f+g+p) is over 45m (148
ft
), (but
not exceed : 90m/295
ft
) increase pipe size of b,c,d,e,f,g (b,c,d,e,f,g :
pipe 1 size up)
Total pipe length
If main pipe size is not increased,a+bx2+cx2+dx2+ex2+fx2+gx2+h+i
+j+k+l+m+n+p
≤
1000m (3281
ft
)
If main pipe size is not increased, ax2+bx2+cx2+dx2+ex2+fx2+gx2+h
+i+j+k+l+m+n+p
≤
1000m (3281
ft
)
Each Y-joint ~
each indoor
h,I,j,..p
≤
45m (148
ft
)
Between
indoor units
The difference between the distance of the outdoor unit to the farthest
indoor unit and the distance of the outdoor unit to the farthest indoor
unit
≤
45m (148
ft
) (a+b+c+d+e+f+g+p)-(a+h)
≤
45m (148
ft
)
GF
h i j k l m n
b
a
c d e f g p
b
a
c d e f
g
h
i
k
j
b
a
c d e f
g
h
i
GF
h i j k l m n
b
a
c d e f g p
b
a
c d e f
g
h
i
k
j
b
a
c d e f
g
h
i
GF
h i j k l m n
b
a
c d e f g p
6
Refrigerant piping works
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