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Allowable length/height difference of refrigerant piping for quiet places (with PMV Kit)
Allowable
value
Piping section
Total extension of pipe (Liquid pipe, real length) 150 m
L1 + L2 + L3 + L4
+ a + b + c + d + e + f + g + h + I + j + k+ l + m + n
Real length 65 m
Furthest piping length L (
1)
Equivalent length 80 m
L1 + L3 + L4 + g + n
Max. equivalent length of main pipe 50 m L1
Equivalent length of furthest piping from
1
st
branching Li (
1)
15 m L3 + L4 + g + n
Max. real length of indoor unit connecting pipe 15 m a + h, b + i, c + j, d + k, e + l, f + m. g + n
Piping
Length
Real length between PMV KIT and indoor unit
2 m or more
Below 10 m
h, i, j, k, l, m, n
Upper outdoor unit 30 m ———
Height between indoor
and outdoor units H1
Lower outdoor unit 20 m ———
Height
Difference
Height between indoor unit and PMV kit H2 15 m ———
1 : Furthest indoor unit from 1
st
branch to be named “A”.
PMV Kit
Indoor unit Indoor unit
PMV Kit
NO GOOD OK
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.
Outdoor unit
1st branching
section
Main pipe
L1
Height difference
between indoor
and outdoor units
H1
Height difference
between indoor unit
and PMV Kit
H2
* Between highest unit
and lower units.
Example)
Indoor unit
Equivalent length corresponded to farthest piping L
Equivalent length corresponded to farthest piping after 1st branching Li
L4
e
f
lm
n
g
Branching pipe L2
Branch header
Branching pipe
L3
ab
hi jk
cd
Y-shape
branch joint
PMV Kit
H2
H2
H2
A
1
3
REFRIGERANT PIPING
18


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