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Example of connection (R-410A Type)
a
Pipe size selection
How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged R (kg)
R should be rounded off in units of 0.1 kg
Note
246
A,B,C. Piping between outdoor unit and refrigerant branch kit
• Choose from the following table in accordance with the outdoor unit total
capacity type, connected downstream.
Outdoor unit connection piping size
Piping size (outer diameter) (mm)
Outdoor unit
capacity type
Gas pipe
Liquid pipe
CMSQ200
15.9
9.5
CMSQ250
19.1
When the equivalent pipe length between outdoor and indoor units is 90 m or more, the size of the main pipes (both gas side and liquid side) must be increased.
Depending on the length of the piping, the capacity may drop, but even in such a case it is possible to increase the size of the main pipes.
Gas side
15.9 →
CMSQ200
19.1
CMSQ200
19.1 →
CMSQ250
22.2
CMSQ250
— Increase is not allowed
X
= Total length (m) of liquid piping size at
a
1...6
Example for refrigerant branch using refnet joint and refnet header for CMSQ250
If the outdoor unit is CMSQ250 and the piping lengths are as below
Allowable length after the first refrigerant branch kit to indoor units is 40 m or less, however it can be extended up to 90 m if all the following conditions are fulfilled.
Required conditions
It is necessary to increase the pipe size of the liquid and the gas pipe if the pipe length between the first
and the final branch kit is over 40 m (reducers must be procured on site).
If the increased pipe size is larger than the pipe size of the main pipe, then the pipe size of the main pipe
needs to be increased as well.
For calculation of total extension length, the actual length of above pipes must be doubled (except main
pipe and the pipes that not increase the pipe size).
Indoor unit to the nearest branch kit ≤40 m.
The difference between the distance of the outdoor unit to the farthest indoor unit and the distance of the
outdoor unit to the nearest indoor unit ≤40 m.
D. Piping between refrigerant branch kits
• Choose from the following table in accordance with the total capacity of
all the indoor units connected below this.
• Do not let the connection piping exceed the refrigerant piping size
chosen by general system model name.
Piping size (outer diameter) (mm)
Indoor or outdoor unit
total capacity
Gas pipe
Liquid pipe
<150
15.9
150≤x<200
19.1
200≤x<250
22.2
First refrigerant branch kit
Liquid side
Outdoor
unit
Increase
9.5
Main
pipes
9.5 →
12.7
Example drawings
indoor unit 4: b+c+d≤90 m
increase the pipe size of b, c, d
a+b*2+c*2+d*2≤200 m
e, f, g, h≤40 m
The farthest indoor unit 4
The nearest indoor unit 1
(a+b+c+d)–(a+e)≤40 m
E. Piping between refrigerant branch kit and indoor unit
• Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
Piping size (outer diameter) (mm)
Indoor capacity type
Gas pipe
50
12.7
60~125
15.9
9.5
Indoor unit
Increase the pipe size as follows
9.5 →
15.9 →
12.7
19.1
12.7 →
19.1 →
15.9
22.2
* If available on the site. Otherwise it can not be increased.
1
1 Outdoor unit
a
b
c
d
H1
2 Refnet joints (A~D)
2
A
B
C
D
h
e
f
g
3
3 Indoor units (1~4)
1
2
3
H2
4
SiBE28-805
Liquid pipe
6.4
9.5
22.2 →
25.4*
Appendix

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Chapters

Troubleshooting

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This manual also for:

Fmdq50-125a7v3b, Cmsq250a7w1b, Fmcq50-125a7veb

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