Toshiba MMY-MUP0801HT8JP-E, Installation Manual, Page: 20 / 42

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Allowable length of refrigerant pipes and allowable height
difference between units
a b c d e
(e)
(b) (a) (c) (d)
L4
f g h i j
(j)
L5 L6
Height
difference
between
outdoor
units
H3
≤ 5 m
Height
difference
between
outdoor
and indoor
units:
H1
≤ (70 m)
Main
piping
L1
Outdoor
Equivalent length corresponded to farthest piping
between outdoor unit
LO
< 40 m
Y-shape branching
joint for gas pipe
Branching piping
L2
Equivalent length corresponded to farthest piping
L
≤ 250 m
Equivalent length corresponded to farthest piping after 1st branching
Li
≤ 90 m
Height
difference
between
indoor
units:
H2
≤ 40 m
Indoor unit
Connecting piping of indoor unit
1st branching
section
Branching
header
Indoor unit
Y-joint
L7
Y-joint
Y-shape branching
joint for liquid pipe
A
Header
unit
B
Follower
C
Follower
D
Follower
E
Follower
unit
L3
¡
System restriction
Outdoor unit combination Up to 5 units
Total capacity of outdoor units Up to 120 HP
Indoor unit connection Up to 128 units
Total capacity of indoor units
(varies depending on the height difference between
indoor units.)
H2 ≤ 15 m
Single 200% of outdoor units’ capacity
Combination 150% of outdoor units’ capacity
H2 > 15 m 105% of outdoor units’ capacity
¡
Cautions for installation
• Set the outdoor unit fi rst connected to the bridging pipe to the indoor units as the header unit.
• Install the outdoor units in order of their capacity codes: A (header unit) ≥ B ≥ C ≥ D ≥ E
• When connecting gas pipes to indoor units, use Y-shaped branching joints to keep pipes level.
• When piping to outdoor units using Outdoor unit connection piping kits, intersect the pipes to the outdoor unit
and those to indoor units at a right angle as shown in fi gure 1 on “6. Installation of the outdoor unit”. Do not
connect them as in fi gure 2 on “6. Installation of the outdoor unit”.
¡
Allowable length and allowable height difference of refrigerant piping
Item
Allowable
value
Piping section
Piping length
Total extension of pipe (Liquid
pipe, real length)
Single outdoor
unit system
500 m
LA + LB + LC + La + Lb + Lc + Ld + Le +
L1 + L2 + L3 + L4 + L5 + L6 + L7 + a + b
+ c + d + e + f + g + h + i + j
Multiple
outdoor unit
system
1200 m (*6)
Farthest piping Length L (*1)
Equivalent
length
250 m
LA + LB + LC + Le + L1 + L3 + L4 + L5
+ L6 + j
Real length 210 m
Max. equivalent length of main
piping
Equivalent
length
120 m (*3)
L1
Real length 100 m (*3)
Equivalent length of farthest piping from 1st
branching
Li (*1)
90 m (*2) L3 + L4 + L5 + L6 + j
Equivalent length of farthest piping between
outdoor units
LO
40 m LA + LB + LC + Le (LA + LB + LC + Ld)
Max. equivalent length of outdoor unit connecting
piping
10 m La, Lb, Lc, Ld, Le
Max. real length of indoor unit connecting piping 30 m a, b, c, d, e, f, g, h, i, j
Max. equivalent length between branches 50 m L2, L3, L4, L5, L6, L7
Difference in
height
Height between indoor and
outdoor units
H1
Upper
outdoor unit 70 m
(*4,*7)
–
Lower
outdoor unit 40 m
(*5, *8)
–
Height between indoor units H2 40 m –
Height between outdoor units H3 5 m –
*1: (E) is outdoor unit furthest from the 1st branch and (j) is the indoor unit furthest from the 1st branch.
*2: If the height difference between indoor and outdoor unit (H1) exceeds 3 m, the piping length is 65 m or less.
*3: If the max. combined outdoor unit capacity is 54HP or more, then max. equivalent length is 70 m or less (real length is
50 m or less).
*4: If the height difference between indoor units (H2) exceeds 3 m, the difference in height is 50 m or less.
*5: If the height difference between indoor units (H2) exceeds 3 m, the difference in height is 30 m or less.
*6: Total charging refrigerant is 140 kg or less.
*7: Extension up to 110 m is possible with conditions below :
• Independent outdoor unit system
• Capacity of combined indoor units : 105% or less
• Liquid side has been increased one size from the standard size.
•The height difference between indoor units(H2) is 3 m or less.
*8: Extension up to 110 m is possible with conditions below :
• System combining two or more outdoor units
• Capacity of combined indoor units : 105% or less
• Minimum capacity of connecting indoor unit is more than 3HP
•The height difference between indoor units(H2) is 3 m or less.