Toshiba MMY-MAP0501T8 Installations-Handbuch Seite 18

5
REFRIGERANT PIPING
Allowable length of refrigerant pipe and height difference
Height
difference
between
Outdoor unit
outdoor
units
H3 5 m
T-shape branching
joint
Main
piping
L1
Height
difference
between
outdoor
units
H1 50 m
• Restriction to the system
Max. No. of combined outdoor units
Max. capacity of combined outdoor units
Max. No. of connected indoor units
Max. capacity of connected indoor units
(Differs by height difference between indoor units)
• Allowable length/height difference of the refrigerant pipe
Total extended pipe length
(Liquid pipe/real length)
Farthest equivalent piping length L (∗1)
Max. equivalent length of main pipe (∗3)
Pipe
length Farthest equivalent piping length from 1st branch Li (∗1)
Farthest equivalent piping length between outdoor units LO (∗1)
Max. equivalent length of outdoor unit connecting pipe
Max. real length of outdoor unit connecting pipe
Height difference between
indoor unit and outdoor unit H1
Height
difference
Height difference between indoor units H2
Height difference between outdoor units H3
∗1 : Farthest outdoor unit: (d), farthest indoor unit: (j) from 1st branch
∗2 : If the height difference (H2) between indoor units exceeds 3m, set below 30m.
∗ ∗ ∗ ∗ ∗ 3 : If Max. capacity of the combined outdoor units exceeds 46HP, Max. equivalent length is up to 70m.
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Follower Follower
Header
unit 1 unit 2
unit
A B C
outdoor unit
connecting
pipe
(a) (b) (c)
La Lb Lc
LA LB
Main connecting piping between outdoor units
Length corresponded to farthest piping
between outdoor units LO
Branching pipe L2
Connecting piping of indoor unit
1st branching
section
a
L3
Equivalent length corresponded to farthest piping L
Equivalent length corresponded to farthest piping after 1st branching Li
L4
Y-joint
f
15m < H2 < 30m
Outdoor at upper side
Outdoor at lower side
manuals search engine
D
Follower
unit 3
(d)
• Cautions concerned with installation/
construction
1) The leading outdoor unit connected with the
indoor inter-unit pipe is made "A (Header unit)".
2) Set the units in order of the outdoor capacity.
Ld
(A (Header unit) > B > C > D)
3) For the combination of the outdoor units, refer to
"Combination of outdoor unit" list.
25 m
Branching
header
L7
b c
Indoor unit
175 m
L6
L5
g h
Indoor unit
4 units
48HP
48 units
H2 < 15m 135% of capacity of outdoor unit
105% of capacity of outdoor unit
Allowable
value
300m
175m
85m
65m
25m
10m
30m
50m
40m (*2)
30m
5m
15
d e
65 m
i j
Pipe section
LA + LB + La + Lb + Lc + Ld + L1 + L2 + L3 + L4
+ L5 + L6 + L7 + a + b + c + d + e + f + g + h + i + j
LA + LB + Ld + L1 + L3 + L4 + L5 + L6 + j
L1
L3 + L4 + L5 + L6 + j
LA + LB + Ld (LA + Lb, LA + LB + Lc)
Ld (La, Lb, Lc)
a, b, c, d, e, f, g, h, i, j
——
——
——
——
Height difference
between indoor
units
H2 30 m