Toshiba MMY-MAP0804FT8-E, Installation Manual

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– 14 –
 Allowable length of refrigerant pipes and allowable height
difference between units
Height difference
between outdoor units
H3 ≤ 5 m
Height
difference
between
indoor
units:
H2 ≤ 40 m
Lc Lb La
L8
LA
Outdoor unit connection piping kit
O
u
td
oo
r u
n
it c
onne
ct
in
g
pi
pe
s
Mai
n p
ipi
ng
L
1
Height
difference
between
outdoor
and indoor
units:
H1 ≤ 50 m
First
branching
section
L3
L4
L5
L6
Indoor unit
f
The longest piping length: L
≤
200 m
a
A
Header unit
C
Follower unit
B
Follower unit
(c)
(b) (a)
Outdoor
unit
Branching pipe L2
Heating / cooling switching unit connecting pipe
Branching header
Y-shaped branching joint
g
b
h
c
k l
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
L7
Flow selector unit
Indoor unit
connecting pipe i
d
e
j
m n
(m) (n)
(o)
H
ei
ght
di
ff
er
en
ce
be
tw
een i
n
do
or
un
its
(I
n th
e sa
me he
at
in
g
/ c
ool
in
g
sw
itc
h
in
g un
it gr
ou
p)
H4 ≤ 0.5 m
(When
outdoor
unit is
higher)
(When
outdoor unit
is higher)
o
Farthest piping length between
outdoor units LO ≤ 15 m
◆
System restriction
◆ Limit on connecting multiple indoor units to flow selector 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”.
Outdoor unit combination Up to 3 units
Total capacity of outdoor units Up to 42 HP
Indoor unit connection Up to 48 units
Total capacity of indoor units
(varies depending on the height difference between
indoor units.)
H2 ≤ 15 m 135 % of outdoor units’ capacity
15 m < H2 105 % of outdoor units’ capacity
Model name RBM-Y1123FE ✽ RBM-Y1803FE ✽ RBM-Y2803FE ✽
Total capacity codes of connected indoor units Below 11.2 11.2 to below 18.0 18.0 to 28.0 or less
Max. No. of connected indoor unit Below 5 Below 8 Below 8
27-EN 28-EN