Toshiba MMY-MAP0806HT8P-E Installation Manual page 66

Allowable length of refrigerant pipes and allowable height
difference between units
Outdoor unit
A B
Height
Header Follower
difference
unit unit
between
outdoor
units
H3 ≤ 5 m
La Lb
LA
Outdoor unit connection piping kit
(For linking of outdoor units)
The longest piping between outdoor units:
Height
LO ≤ 25 m
difference
between
outdoor
and indoor
units:
H1 ≤ 70 m
Indoor unit connecting
pipe
First branching
section
L3
The longest piping length from the first branch: Li ≤ 90 m
Y-shaped
branching joint
f
Indoor unit
¿ System restriction
Outdoor unit combination
Total capacity of outdoor units
Indoor unit connection
Total capacity of indoor units
(varies depending on the height difference between
indoor units.)
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C
Follower unit
Lc
Branching header
Y-shaped branching
L7
joint
Indoor unit
a b c d e
The longest piping length: L ≤ 235 m
L6
L5
L4
h i j
g
(j)
Up to 3 units
Up to 60 HP
Up to 64 units
H2 ≤ 15m 135% of outdoor units' capacity
15m < H2 105% of outdoor units' capacity
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¿ Cautions for installation
• Set the outdoor unit first 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
• 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 figure 1 on "6. Installation of the outdoor unit". Do not
connect them as in figure 2 on "6. Installation of the outdoor unit".
¿ Allowable length and allowable height difference of refrigerant piping
Total extension of pipe (Liquid
pipe, real length)
Farthest piping Length L (*1)
Equivalent length of farthest piping from 1st
branching Li (*1)
Piping length Equivalent length of farthest piping between
outdoor units LO
Max. equivalent length of main
piping
Max. equivalent length of outdoor unit connecting
piping
Max. real length of indoor unit connecting piping
Max. equivalent length between branches
Height between indoor and
outdoor units H1
Difference in
height
Height between indoor units H2
Height between outdoor units H3
Height
difference
(*1) : (C) is outdoor unit furthest from the 1st branch and (j) is the indoor unit furthest from the 1st branch.
between
(*2) : If the height difference (H1) between indoor and outdoor unit exceeds 3m, set 65m or less.
indoor
(*3) : If the max. combined outdoor unit capacity is 46HP or more, then max. equivalent length is 70m or less
units:
(real length is 50m or less).
H2 ≤ 40 m
(*4) : If the height difference (H2) between indoor units exceeds 3m, set 50m or less.
(*5) : If the height difference (H2) between indoor units exceeds 3m, set 30m or less.
(*6) : Total charging refrigerant is 140kg or less
(*7) : Extension up till 90m is possible with conditions below.
- Outdoor Temperature Cooling : 10ºC to 46ºC (Dry-bulb temp.)
Heating : -5ºC to 15.5ºC (Wet-bulb temp.)
- Equivalent length of farthest piping from 1st branching Li<50m
- Real length of main piping L1<100m
- Height difference between indoor units H2<3m
- Total capacity of combined indoor units : 90%-105%
- Single CDU, and up to 20HP
- Minimum capacity of connectable indoor unit : 4HP or Larger
Allowable
Item
value
LA + La + Lb + Lc+ L1 + L2 + L3 + L4+
Below 34HP 300m
L5 +L6 + L7 + a + b + c + d + e + f + g
34HP or more 1000m (*6)
+ h + i + j
Equivalent
235m
length
Lc + LA + L1 + L3 + L4 + L5 + L6 + j
Real length 190m
90m (*2) L3 + L4 + L5 + L6 + j
25m LA + Lc(LA + Lb)
Equivalent
120m (*3)
length
L1
Real length 100m (*3)
10m Lc(La, Lb)
30m a, b, c, d, e, f, g, h, i, j
50m L2, L3, L4, L5, L6, L7
Upper outdoor
70 m (*4,*7)
unit
Lower outdoor
40m (*5)
unit
40m
5m
Piping section
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