RXYQ-P8
RXYQ-P(8)
RXYHQ-P8
4PW48461-1
Pipe size selection
For an outdoor unit multi installation
(RXYQ20~54P + RXYHQ16~36), select the pipe
size in accordance with the following figure.
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
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.
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.
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.
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
Example for refrigerant branch using refnet joint and
refnet header for RXYQ34P ((1x 16) + (1x 18))
If the outdoor unit is RXYQ34P and the piping lengths are
as below
Note 1
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 Example drawings
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.
indoor unit 8:
b+c+d+e+f+g+p90 m
increase the pipe size
of b, c, d, e, f, g
Increase the pipe size as follows
* If available on the site. Otherwise it can not be increased.
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)
a+b*2+c*2+d*2+e*2+f*2+g*2
+h+i+j+k+l+m+n+p1000 m
Indoor unit to the nearest branch kit 40 m h, i, j....... p40 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
The farthest indoor unit 8
The nearest indoor unit 1
(a+b+c+d+e+f+g+p)–(a+h)40 m
Note 2
If the pipe size above the refnet header is Ø34.9 or more, KHRQ22M75H is required.
BA
CDE
B B
Outdoor unit
capacity type
Piping size (outer diameter) (mm)
Gas pipe Liquid pipe
RX(Y)Q5 Ø15.9
Ø9.5
RX(Y)Q8 Ø19.1
RX(Y)Q10 Ø22.2
RX(Y)Q12~16 +
RXYHQ12+16
Ø28.6
Ø12.7
RX(Y)Q18 +
RXYQ20+22 +
RXYHQ18~22
Ø15.9
RXY(H)Q24
Ø34.9
RXY(H)Q26~34
Ø19.1
RXYQ36~54 +
RXYHQ36
Ø41.3
Indoor or outdoor unit
total capacity
Piping size (outer diameter) (mm)
Gas pipe Liquid pipe
150 Ø15.9
Ø9.5150x200 Ø19.1
200x290 Ø22.2
290x420
Ø28.6
Ø12.7
420x640 Ø15.9
640x920 Ø34.9
Ø19.1
920 Ø41.3
Indoor capacity
type
Piping size (outer
diameter) (mm)
Gas pipe Liquid pipe
20~50 Ø12.7 Ø6.4
63~125 Ø15.9
Ø9.5200 Ø19.1
250 Ø22.2
Gas side Liquid side
RX(Y)Q5 Ø15.9 ➞ Ø19.1 RX(Y)Q5 Ø9.5 —
RX(Y)Q8 Ø19.1 ➞ Ø22.2 RX(Y)Q8+10 Ø9.5 ➞ Ø12.7
RX(Y)Q10 Ø22.2 ➞ Ø25.4
a
a. If not available, increase is not allowed
RX(Y)Q12~16 + RXYHQ12+16 Ø12.7 ➞ Ø15.9
RX(Y)Q12 + 14 + RXYHQ12 Ø28.6 — RX(Y)Q18 + RXYQ20~24 + RXYHQ18~24 Ø15.9 ➞ Ø19.1
RX(Y)Q16 + 18 + RXYQ20+22 + RXYHQ16~22 Ø28.6 ➞ Ø31.8
a
RXYQ26~54 + RXYHQ26~36 Ø19.1 ➞ Ø22.2
RXYQ24 + RXYHQ24 Ø34.9 — — Increase is not allowed
RXYQ26~34 + RXYHQ26~34 Ø34.9 ➞ Ø38.1
a
RXYQ36~54 + RXYHQ36 Ø41.3 —
— Increase is not allowed
1
Outdoor unit
2
Main pipes
3
Increase
4
First refrigerant branch kit
5
Indoor unit
1
6
2
54
3
The refrigerant charge of the system must be less than
100 kg. This means that in case the calculated
refrigerant charge is equal to or more than 100 kg you
must divide your multiple outdoor system into smaller
independent systems, each containing less than 100 kg
refrigerant charge.
For factory charge, refer to the unit name plate.
X1...6 = Total length (m) of liquid piping size at Øa
A = Weight according to table
Ø9.5 ➞ Ø12.7 Ø15.9 ➞ Ø19.1 Ø22.2 ➞ Ø25.4*
Ø12.7 ➞ Ø15.9 Ø19.1 ➞ Ø22.2 Ø28.6 ➞ Ø31.8*
Ø34.9 ➞ Ø38.1*
ab c d e f
g
H1
p
ABCDEFG
1234567
8
H2
hijklmn
1
2
3
1 Outdoor unit
2 Refnet joints
(a~g)
3 Indoor units (1~8)
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