Daikin RXYQ10M9W1B [11/28] Precautions when selecting branch piping

Daikin RXYQ5M9W1B [11/28] Precautions when selecting branch piping
RXQ5~10 + RXYQ5~48M9W1B
VRVII System air conditioner
4PW21816-1A
Installation manual
6
See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
After all the piping has been connected, use nitrogen to perform
a gas leak check.
Precautions when selecting branch piping
If the overall equivalent piping length is 90 m, be sure to enlarge the
pipe diameter of the liquid-side and gas-side main piping. (This does
not apply to RX(Y)Q5 type)
If the recommended pipe size is not available, stick to the original
pipe diameter (which may result in a small capacity decrease).
Cautions for installation of multiple outdoor units
1. The piping between the outdoor units must be routed level or slightly
upward to avoid the risk of oil detention into the piping side.
Pattern 1
Pattern 2
Prohibited pattern: Change to Pattern 1 or 2
2. To avoid the risk of oil retention to the stopping unit side, always
connect the stop valve and the piping between outdoor units as
shown in the figure A or figure B.
Prohibited pattern
Oil remains in the outdoor unit that stops.
Change to pattern 1 or 2
Oil remains in the outdoor unit C when the system stops.
Pipe size
Tightening
Torque (N•m)
A (mm) Flare shape
Ø9.5 32.7~39.9 12.8~13.2
Ø12.7 49.5~60.3 16.2~16.6
Ø15.9 61.8~75.4 19.3~19.7
NOTE
You must use a torque wrench but if you are obliged to
install the unit without a torque wrench, you may follow
the installation method mentioned below.
After the work is finished, make sure to check that
there is no gas leak.
When you keep on tightening the flare nut with a
spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten
the flare nut within the angle shown below:
Gas side
RX(Y)Q5 Ø15.9 Ø19.1
RX(Y)Q8 Ø19.1 Ø22.2
RX(Y)Q10 Ø22.2 Ø25.4
RXYQ12+14 Ø28.6 Not Increased
RXYQ16~22 Ø28.6 Ø31.8
RXYQ24 Ø34.9 Not Increased
RXYQ26~34 Ø34.9 Ø38.1
RXYQ36~48 Ø41.3 Not Increased
Liquid side
RX(Y)Q5 Ø9.5 Not Increased
RX(Y)Q8+10 Ø9.5 Ø12.7
RXYQ12~16 Ø12.7 Ø15.9
RXYQ18~24 Ø15.9 Ø19.1
RXYQ26~48 Ø19.1 Ø22.2
R=0.4~0.8
45
±2
90
±2
A
Pipe size
Further tightening
angle
Recommended
arm length of tool
Ø9.5 (3/8") 60~90° ±200 mm
Ø12.7 (1/2") 30~60° ±250 mm
Ø15.9 (5/8") 30~60° ±300 mm
1
2
2
1
1 To indoor unit
2 Piping between outdoor units
1
1
1 To indoor unit
1
1
1 To indoor unit
A
B
A
B
1
1
222
222
11
AB
C C
AB
33

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