19
3
Refrigerant piping design
3-4. Allowable length / height difference of refrigerant piping with PMV
Kit
*1 Furthest indoor unit from 1st branch to be named "A"
Allowable value
Piping section
Pipe Length
Total extension of pipe (Liquid pipe, real length)
75 m
L1 + L2 + L3 + a + b + c + d + e + f + g + h + i
+ j + k + l
Furthest piping length
L
(*1)
Real length
40 m
L1 + L3 + f + l
Equivalent length
50 m
Max. real length of main pipe
25 m
L1
Max. real length of furthest piping from 1st branching Li (*1)
15 m
L3 + f + l
Max. real length of indoor unit connecting pipe
10 m
a + g, b + h, c + i, d + j, e + k, f + l
Real length between PMV Kit and indoor unit
2 m or more
Below 10 m
g, h, i, j, k, l
Height
Difference
Height between indoor and outdoor units
H1
Upper outdoor unit
15 m
―
Lower outdoor unit
15 m
―
Height between indoor unit and PMV Kit H2
10 m
―
NOTE
Do not connect two or more indoor units to one PMV Kit.
Arrange one indoor unit and one PMV Kit set to 1 by 1.
K
O
D
O
O
G
O
N
PMV Kit
PMV Kit
t
i
n
u
r
o
o
d
n
I
t
i
n
u
r
o
o
d
n
I
e
l
f
a
b
g
h
i
j
c
d
H2
H2
H2
A
*1
L3
L1
L2
k
Outdoor unit
Height
difference
between
indoor and
outdoor
units H1
Main
pipe
1st branching
section
Branching pipe
Branching
header
Indoor unit
Y-shaped
branching joint
Branching pipe
Equivalent length corresponded to farthest piping L
Equivalent length corresponded to farthest piping after 1st branching Li
Height difference
between indoor unit
and PMV Kit
H2
*
* Between highest
unit and lower
units.
PMV Kit
Example)
