Toshiba MMU-AP0091H Owner's Manual Installation And Operation page 41

Allowable length of refrigerant pipe and height difference
Height difference
between
Outdoor unit
outdoor units
£
H3 5 m
T-Shape branching
main piping
L1
1st
branching
section
Height difference
L3
between outdoor
and indoor units
£
H1 50 m
Indoor unit which FS unit control wiring is connected.
• Allowable length/height difference of the refrigerant pipe
Total extension of pipe (Liquid pipe/real length)
Farthest piping length L (
Max. equivalent length of main piping
Equivalent length of farthest piping from 1 st branching Li (
Pipe
Max. real length of indoor unit connecting piping
length
Max. real length between FS unit and indoor unit (
Max. equivalent length of outdoor unit connecting pipe LO (
Max. real length of outdoor unit connecting pipe
Max. equivalent length between FS unit and indoor unit Lj
Max. real length between FS unit and indoor unit which FS
unit control wiring is connected Lh (
Height between
indoor unit and outdoor unit H1
Height between
Height
indoor unit H2
difference
Height between outdoor units H3
Height difference between indoor units in group control by one
FS unit H4
1 : The farthest indoor unit from 1st branch to be named C, and farthest indoor unit from 1st branch to be named (q).
*
2 : Attached connection cable can be used up to 5 m in pipe length between indoor unit and FS unit.
*
When the pipe length between indoor and FS unit exceeds 5 m, be sure to use the connection cable kit (RBC-CBK15FE).
• 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
Min. capacity of connected indoor units
3 : MMY-MAP1202FT8 up to 120%.
*
Follower unit C
Header unit A Follower unit B
La Lb
LA
Main connecting piping between outdoor units
Length corresponded to farthest piping
between outdoor units LO
Branching piping L2
Connecting piping of
indoor unit
a b c
FS unit
g h i
Indoor unit
Equivalent length corresponded to farthest piping L
Equivalent length corresponded to farthest piping after 1st branching Li
L6
L5
L4
f
d
e
FS unit
l n
m
Indoor unit
Real length
1)
*
Equivalent length
*
2)
*
Upper outdoor unit
Lower outdoor unit
Upper outdoor unit
Lower outdoor unit
3 units
84.0 kW
48 units
H2 < 15 m 135% (
H2 > 15 m 105%
Outdoor capacity : 70%
• Cautions concerned with installation/construction
1) The leading outdoor unit connected with the indoor
2) Set the units in order of the outdoor capacity.
3) For the combination of the outdoor units, refer to
Note:
In case of connecting method <Ex.2>, a large amount of
refrigerant and refrigerant oil may return to the head unit.
Therefore, set the T-shape joint so that oil does not enter directly.
Lc
£
25 m
Branching header
L9
j k
<Cooling only> <Cooling only>
£
150 m
£
50 m
Lj
L8
L7
FS unit
o
Lh
p q
<Group control>
When connecting the plural indoor units to single FS unit.
Allowable
value
LA + La + Lb + Lc + L1 + L2 + L3 + L4 + L5 + L6 + L7 + L8 + L9
300 m
+ a + b + c + d + e + f + g + h + i + j + k + l + m + n + o+ p + q
125 m
150 m
85 m
1) 50 m
*
30 m
2) 15 m
1) 25 m
*
10 m
30 m
15 m
50 m
30 m
35 m
15 m
5 m
0.5 m
Note 1) Combination of outdoor unit : Header unit (1 unit) + Follow unit
(0 to 2 units). Header unit is outdoor unit nearest to the
connected indoor units.
Note 2) Install the outdoor units in order of capacity.
(Header unit > Follow unit 1 > Follow unit 2)
3)
*
Note 3) Refer to outdoor unit combination table in page 5.
Note 4) Piping to indoor units shall be perpendicular to piping to the
head outdoor unit as <Ex. 1>. Do not connect piping to indoor
units in the same direction of head outdoor unit as <Ex. 2>.
38
inter-unit pipe is made "A (Header unit)".
(A (Header unit) > B > C > D)
"Combination of outdoor unit" list.
Header Follower
<Ex.1>
unit A
OK
Header Follower
<Ex.2>
unit A
NO GOOD
Height difference between
£
indoor units H2 35
(Upper outdoor unit)
Height difference between
indoor units in group control
by one FS unit H4
Pipe section
LA + Lc + L1 + L3 + L4 + L5 + L6 + L7 + L8 + q
L1
L3 + L4 + L5 + L6 + L7 + L8 + q
a + g, b + h, c + i, d + l, e + m, f + m, f + n, j, k
g, h, i, l, m, n, L7 + o
LA + Lc (LA + Lb)
La, Lb, Lc
L7 + L8 + p, L7 + L8 + q
L7 + o
——
——
——
——
——
——
Follower
unit B unit C
Follower
unit B unit C
£
0.5 m