Toshiba Carrier MMY-MAP0726HT6P-UL Installation Manual page 12

No. Piping parts Name
(5) Indoor unit connection pipe (Table 5)
Branching section
Indoor unit
(5)
connecting pipe
Indoor unit
(6) Y-shaped branching joint (Table 6)
Total capacity code of the indoor units on the downstream side from
Y-shaped
(6)
Branching section
branching joint
(7) Branching header (Table 7)
Total capacity code of the indoor units on the downstream side from
(7)
Branching section Branching header
For 4 branching
For 8 branching
(8) Outdoor unit connection piping kit (Table 8)
Outdoor unit Total capacity code of the
total outdoor units on the
connection piping
(8)
Branching section
downstream side (*1)
kit (For linking of
outdoor units)
CAUTION
Please use the appropriate pipe when the pipe size is Ø3/4 or more. (Table 9)
Minimum
Outer diameter
wallthickness
Inch mm Inch mm
0.03
Ø1/4" 6.35 0.80
Ø3/8" 9.52 0.03 0.80
0.04
Ø1/2" 12.7 1.00
Ø5/8" 15.88 0.04 1.00
0.04
Ø3/4" 19.05 1.00
Ø7/8" 22.2 0.04 1.00
0.04
Ø1-1/8" 28.58 1.00
Ø1-3/8" 34.92 0.05 1.20
0.06
Ø1-5/8" 41.28 1.40
*1: Code is determined according to the capacity type.
*2: When using a branching joint for the first branch, select according to capacity code of the outdoor unit.
*3: For 1 line after branching header indoor units with a maximum capacity code of 57 in total can be connected.
*4: If the piping size becomes over main piping size, select the size same as main piping.
*5: When the first branch is a header with the outdoor total capacity of 120 to 247, apply the model RBM-HY2043UL
(4-branch) or RBM-HY2083UL (8-branch) regardless of the total capacity codes of the down-stream indoor units.
*6: When the sum of capacity code of indoor units exceeds the capacity code of outdoor units, select according to capacity
code of the outdoor units.
21-EN
Selection of pipe size
Indoor unit capacity code Gas side
49 ft length
Pipe length
7.5 to 12
(Actual length)
Over 49 ft
15.4 to 18
21 to 54
72 to 96
Y-shaped branching joint (*2) (*3) (*6)
Below 61
61 to below 134
134 to below 239
239 or more
branching header (*2 ) (*3) (*5) (*6)
Below 134
134 to below 239
Below 134
134 to below 239
The start point of the downstream side is
the outdoor unit connection piping kit.
The total capacity code of the outdoor
Model name
units on the downstream side.
Example1: The total capacity code of
Unit A, B and Unit C
Below 247 RBM-BT14UL
Example2: The total capacity code of
247 or more RBM-BT24UL
Unit B and Unit C
Temper
Soft Hard, Semi hard
OK OK
OK OK
OK OK
OK OK
OK OK
NG OK
NG OK
NG OK
NG OK
NG OK
– 11 –
■ Allowable length of refrigerant pipes and allowable height
Remarks
difference between units
Liquid
side
Ø3/8" Ø1/4"
Ø1/2" Ø1/4"
Ø1/2" Ø1/4"
Ø5/8" Ø3/8"
Ø7/8" Ø1/2"
Height
difference
between
H3
outdoor
units
Model name
H3 ≤ 16 ft
(5m)
RBM-BY 55UL
RBM-BY105UL
Outdoor
unit
RBM-BY205UL
connection
RBM-BY305UL
piping kit
Model name
RBM-HY1043UL
RBM-HY2043UL
RBM-HY1083UL
First branching
RBM-HY2083UL
H1
section
Height
difference
between
outdoor
and
indoor
units:
H1 ≤ 230 ft
(70 m)
(*6)
Indoor unit connecting pipe
Follower unit
Unit (C)
Header unit Follower unit
Unit (A) Unit (B)
La Lb Lc
LA
Main
piping Farthest equivalent piping length
between outdoor units : LO ≤ 82 ft (25m)
L1
Branching pipe L2
Indoor unit connecting pipe
a b
(a) (b)
L3
Indoor unit
The longest piping length : L ≤ 771 ft (235m)
The longest piping length from the fi rst branching : Li ≤ 295 ft (90m) (*5)
L5
L4
f g
(g)
(f)
Indoor unit
Maximum equivalent piping length
of outdoor unit connecting pipe:
Lc (La, Lb) ≤ 33 ft (10m)
Branching header
Y-shape branching joint
L7
c e
d
(c) (d) (e)
H2
Height
difference
L6 between
indoor units:
H2 ≤ 131 ft
(40 m)
h
i j
(h) (i)
(j)
22-EN