Allowable Length / Height Difference Of Refrigerant Piping - Toshiba MCY-MHP0404HT-E Engineering Data Book

3
Refrigerant piping design

3-2. Allowable length / height difference of refrigerant piping

Main
pipe
L1
1st branching
section
Height difference
between indoor and
outdoor units H1
Branching pipe
Total extension of pipe (Liquid pipe, real length)
Furthest piping length L (*1)
Pipe Length
Max. real length of main pipe
Max. real length of furthest piping from 1st branching Li (*1)
Max. real length of indoor unit connecting pipe
Height between indoor and outdoor units H1
Height
Difference
Height between indoor units H2
*1 Furthest indoor unit from 1st branch to be named "A"
Outdoor unit
Branching pipe
L2
L3
Equivalent length corresponded to farthest piping L
Equivalent length corresponded to farthest piping after 1st branching Li
Y-shaped
branching joint
Real length
Equivalent length
Upper outdoor unit
Lower outdoor unit
Branching
header
a b c d
Indoor unit
e
Allowable value
90 m
50 m
60 m
30 m
20 m
10 m
15 m
15 m
10 m
17
Height
difference
between indoor
units H2
f
*1
A
Piping section
L1 + L2 + L3 + a + b + c + d + e + f
L1 + L3 + f
L1
L3 + f
a, b, c, d, e, f
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