Toshiba MMU-AP0091H Owner's Manual Installation And Operation page 40

5
REFRIGERANT PIPING
∗ ∗ ∗ ∗ ∗ Selection of FS unit
No. Model name
RBM-Y1122FE
Š
RBM-Y1802FE
RBM-Y2802FE
∗ ∗ ∗ ∗ ∗ Minimum wall thickness for R410A application
Soft Half Hard or Hard
OK
OK
OK
OK
NG
NG
NG
NG
Follower Follower Header
unit unit unit
C B A
1 1 1
2
1
Outdoor unit
9
connecting
piping
T-shape
branching joint
2
Connecting piping
between outdoor units
Total capacity code of indoor unit
Equivalent to capacity (kW)
Below 11.2
11.2 to below 18.0
18.0 to 28.0 or less
Outer dia. (Inch)
OK
OK
OK
OK
OK
OK
OK
OK
*1 In case the pipe exceeds main pipe size, it should be the same as main pipe size.
*2 2 pipes for cooling only indoor unit shall be used with liquid pipe and suction gas pipe.
*3 Branching pipe on the 1 st branch should be selected according to the capacity code
for outdoor unit.
*4 In case total capacity code for indoor units shall be exceeded to capacity code for
outdoor unit, the pipe size should be selected with capacity code for outdoor unit.
*5 For 1 line after header branching, indoor units with a maximum of 6.0 capacity code in
total can be connected.
Outdoor
unit
2 Balance
pipe
4
Liquid pipe
Discharge gas pipe
Suction gas pipe
3
8
Main piping
1st branching
section
4
Liquid pipe
Discharge gas pipe
Suction gas pipe
Outer dia. (mm)
1/4" 6.35
3/8" 9.52
1/2" 12.70
5/8" 15.88
3/4" 19.05
7/8" 22.20
1.1/8" 28.58
1.3/8" 34.92
8 Branching header joint
5 5
FS unit
10
6 6
Indoor unit
8
8
4
5
FS unit
10
6
Indoor unit
37
Max. No. of connected indoor unit
5
8
8
Minimum wall thickness (mm)
0.80
0.80
0.80
1.00
1.00
1.00
1.00
1.10
4
8
Y-Shape branching joint
5
6 7
<Cooling only>
8
4
8
4
4
4
10
5 5
6 6 7
When connecting the plural
indoor units to single FS unit.
7
8
7 7
<Group control>