Allowable Length/Height Difference Of Refrigerant Piping - Toshiba MiNi-SMMS Installation Manual

Allowable length/height difference of refrigerant piping

Main pipe
L1
1st branching
section
Height difference
between indoor and
outdoor units
Branching pipe
H1
L3
Total extension of pipe (Liquid pipe, real length)
Furthest piping length L (∗1)
Piping
Max. equivalent length of main pipe
Length
Equivalent length of furthest piping from
st
1 branching Li (∗1)
Max. real length of indoor unit connecting pipe
Height between indoor
Height
and outdoor units H1
Difference
Height between indoor units H2
∗1 : Furthest indoor unit from 1
Outdoor unit
Branching pipe L2
Equivalent length corresponded to farthest piping L
Equivalent length corresponded to farthest piping after 1st branching Li
e
Y-shape
branch joint
Real length
Equivalent length
Upper outdoor unit
Lower outdoor unit
st
branch to be named "A".
Branch header
a b c d
Indoor unit
L4
f
Allowable value
180 m L1 + L2 + L3 + L4 + a + b + c + d + e + f + g
100 m
125 m
65 m
35 m
15 m
30 m
20 m
15 m
14
Height difference
between indoor units
H2
g
∗1
A
Piping section
L1 + L3 + L4 + g
L1
L3 + L4 + g
a, b, c, d, e, f. g
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