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Installation Manual
EN-33
EN-34
Allowable length / height difference of refrigerant piping
*1 Furthest indoor unit from 1st branch to be named “A”.
Allowable
value
Pipes
Piping Length
Total extension of pipe (liquid pipe, real length)
90 m
L1 + L2 + L3 + a + b + c + d + e + f
Furthest piping length L
(*1)
Real length
50 m
L1 + L3 + f
Equivalent length
60 m
Max. equivalent length of main pipe
30 m
L1
Max. real length of furthest piping from 1st
branching Li (*1)
20 m
L3 + f
Max. real length of indoor unit connecting pipe
10 m
a, b, c, d, e, f
Height
Difference
Height between indoor
and outdoor units H1
Upper outdoor unit
15 m
Lower outdoor unit
15 m
Height between indoor units H2
10 m
f
a
b
c
d
A
*1
L3
L1
L2
e
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
units H2
Allowable length / height difference of refrigerant piping for quiet places (with PMV Kit)
*1 Furthest indoor unit from 1st branch to be named “A”.
Allowable
value
Pipes
Piping 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. equivalent 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 units (PMV Kit) H2
10 m
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)
1FAN_IM_DHV0100301-00_EN.book Page 17 Saturday, November 4, 2017 2:39 PM
