Selection of refrigerant piping – Toshiba SUPER MODULAR MULTI HFC R-410A User Manual
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4. Selection of refrigerant piping
Pipe size of outdoor unit (Table 1)
Model name
MMY-
Gas side
Liquid side
MAP0501T8
MAP0501HT8
Ш5/8”
Ш3/8”
MAP0601T8
MAP0601HT8
Ш3/4”
Ш3/8”
MAP0801T8
MAP0801HT8
Ш7/8”
Ш1/2”
MAP1001T8
MAP1001HT8
Ш7/8”
Ш1/2”
MAP1201T8
MAP1201HT8
Ш1-1/8”
Ш1/2”
Connecting pipe size between outdoor units (Table 2)
Total capacity code of
Gas side
Liquid side
Balance pipe
outdoor units downstream
14 to below 22
Ш1-1/8”
Ш5/8”
Ш3/8”
22 to below 26
Ш1-3/8”
Ш5/8”
Ш3/8”
26 to below 36
Ш1-3/8”
Ш3/4”
Ш3/8”
36 or more
Ш1-5/8”
Ш7/8”
Ш3/8”
Size of main pipe (Table 3)
Total capacity code of
Gas side
Liquid side
all outdoor units (*1)
Below 6
Ш5/8”
Ш3/8”
6 to below 8
Ш3/4”
Ш3/8”
8 to below 12
Ш7/8”
Ш1/2”
12 to below 14
Ш1-1/8”
Ш1/2”
14 to below 22
Ш1-1/8”
Ш5/8”
22 to below 26
Ш1-3/8”
Ш5/8”
26 to below 36
Ш1-3/8”
Ш3/4”
36 to below 46
Ш1-5/8”
Ш7/8”
46 or more
Ш1-5/8” (*5)
Ш7/8”
Determine thickness of the main pipe according to capacity of the outdoor units.
Pipe size between branching sections (Table 4)
Total capacity code of
Gas side
Liquid side
indoor units downstream (*1)
2.8 or less
Ш1/2”
Ш3/8”
2.8 to below 6.4
Ш5/8”
Ш3/8”
6.4 to below 12.2
Ш7/8”
Ш1/2”
12.2 to below 20.2
Ш1-1/8”
Ш5/8”
20.2 to below 25.2
Ш1-3/8”
Ш5/8”
25.2 to below 35.2
Ш1-3/8”
Ш3/4”
35.2 or more
Ш1-5/8”
Ш7/8”
If the total capacity code value of indoor units exceeds that of the outdoor units,
apply the capacity code of the outdoor units.
Piping of indoor unit (Table 5)
Indoor unit size
Gas side
Liquid side
007 to 012
Actual length 15 m or less Ш3/8”
Ш1/4”
Actual length exceeds 15 m Ш1/2”
Ш1/4”
015 to 018
Ш1/2”
Ш1/4”
024 to 056
Ш5/8”
Ш3/8”
072 to 096
Ш7/8”
Ш1/2”
Selection of branching section (Table 6)
Total capacity code of indoor unit (*1)
Model
Y-shape
Below 6.4
RBM-BY53E
branching joint
6.4 to below 14.2
RBM-BY103E
(*2)
14.2 to below 25.2
RBM-BY203E
25.2 or more
RBM-BY303E
Branching
For 4
Below 14.2
RBM-HY1043E
header
branching 14.2 to below 25.2
RBM-HY2043E
(*3)
For 8
Below 14.2
RBM-HY1083E
branching 14.2 to below 25.2
RBM-HY2083E
T-shape
1 set of 3 types of T-shape joint pipes as
RBM-BT13E
branching joint described below:
(For connecting The required quantity is arranged and
outdoor unit)
combined at the site.
• Balance pipe (Corresponding difference
Ш3/8”) Ч 1
• Piping at liquid side (Corresponding
difference Ø3/8” to Ш7/8”) Ч 1
• Piping at gas side (Corresponding
difference Ø5/8” to Ш1-5/8”) Ч 1
Minimum wall thickness for R-410A application (Table 7)
Soft
Half hard or hard
OD (Inch)
Minimum wall thickness (mm)
OK
OK
1/4”
0.80
OK
OK
3/8”
0.80
OK
OK
1/2”
0.80
OK
OK
5/8”
1.00
NG
OK (*4)
3/4”
1.00
NG
OK (*4)
7/8”
1.00
NG
OK (*4)
1-1/8”
1.00
NG
OK (*4)
1-3/8”
1.10
NG
OK (*4)
1-5/8”
1.25
*1
Code is determined according to the unit size. For details, refer to pages 7-9.
*2
When using Y-shape branching joint for 1st branching, select according to capacity code of outdoor unit.
*3
For one line after header branching, indoor units with a maximum of 6.0 capacity code in total can be connected.
*4 If the pipe size is Ø3/4” or more, use a hard type or half hard type for material of the pipe.
*5
The maximum equivalent length of the main pipe should be 70 m or shorter.
Slave
unit 3
Slave
unit 2
Slave
unit 1
Master
unit
Outdoor unit
Balance pipe
T-shape
branching joint
Main piping
Outdoor unit
connection
piping
Main connection
piping between
outdoor units
1st branching
section
Indoor unit
connection piping
Indoor unit
Y-shape
branching
joint
Indoor unit connection piping
Header branching pipe
Indoor unit
Branching pipe