Toshiba MMY-MAP0804FT8-E Installation Manual page 15

 Allowable length of refrigerant pipes and allowable height
difference between units
A
Header unit Follower unit
Outdoor
unit
(a) (b)
La Lb
LA
First
branching
section
Height
difference
between
outdoor
and indoor
units:
H1 ≤ 50 m
L3
(When
outdoor
unit is
higher)
Flow selector unit
Indoor unit
connecting pipe i
27-EN
B
C
Follower unit
Height difference
between outdoor units
(c)
H3 ≤ 5 m
Lc
Farthest piping length between
outdoor units LO ≤ 15 m
Outdoor unit connection piping kit
Branching header
Branching pipe L2
Heating / cooling switching unit connecting pipe
L8
a b c
f g h
The longest piping length: L ≤ 200 m
The longest piping length from the first branch: Li ≤ 65 m
Length equivalent to furthest pipe in heating / cooling
switching unit group: Ln ≤ 30 m
L6
L5
L4
d
e
m
j
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.)
◆ Limit on connecting multiple indoor units to flow selector unit
Total capacity codes of connected indoor units
Max. No. of connected indoor unit
◆ 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".
Y-shaped branching joint
k l
L7
n o
(m) (n)
H4 ≤ 0.5 m
(o)
– 14 –
H2 ≤ 15 m
15 m < H2
Model name RBM-Y1123FE✽ RBM-Y1803FE✽
Below 11.2
Below 5
Height
difference
between
indoor
units:
H2 ≤ 40 m
(When
outdoor unit
is higher)
Up to 3 units
Up to 42 HP
Up to 48 units
135 % of outdoor units' capacity
105 % of outdoor units' capacity
RBM-Y2803FE✽
11.2 to below 18.0 18.0 to 28.0 or less
Below 8 Below 8
28-EN