Installation manual
8
REYQ8~16P8Y1B
VRVIII System air conditioner
4PW39996-1B
Pipe size selection
For an outdoor unit, select the pipe size in accordance with
the following figure.
A. Piping between outdoor unit and refrigerant branch kit
Choose from the following table in accordance with the outdoor unit total capacity type, connected
downstream.
B. Piping between refrigerant branch kit and BS unit
Pipe size for direct connection to indoor unit must be the same as the connection size of indoor unit.
Choose from the following table in accordance with the indoor unit total capacity type, connected
downstream.
Outdoor unit
capacity type (Hp)
Piping outer diameter size (mm)
Indoor unit
capacity type
Piping outer diameter size (mm)
Suction gas pipe HP/LP gas pipe Liquid pipe Suction gas pipe HP/LP gas pipe Liquid pipe
8 19.1 15.9 9.5 <150 15.9 12.7 9.5
10 22.2 19.1 9.5 150≤x<200 19.1 15.9 9.5
12 28.6 19.1 12.7 200≤x<290 22.2 19.1 9.5
14+16 28.6 22.2 12.7 290≤x<420 28.6 19.1 12.7
420≤x<640 28.6 28.6 15.9
C. Piping between refrigerant branch kit or BS unit and indoor unit
Choose from the following table in accordance with the capacity type of the connected indoor unit.
640≤x<920 34.9 28.6 19.1
≥920 41.3 28.6 19.1
Indoor unit
capacity type
Piping outer diameter size (mm)
Suction gas pipe Liquid pipe
20, 25, 32, 40, 50 12.7 6.4
63, 80, 100, 125 15.9 9.5
200 19.1 9.5
250 22.2 9.5
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 1 When the equivalent pipe length between outdoor and indoor units is 90 m or more, the size of the main
liquid pipe must be increased. Never increase suction gas pipe and HP/LP gas pipe sizes.
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 liquid pipe.
Note 2 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 suction gas pipe if the pipe length between the
first and the final branch kit is over 40 m (reducers must be procured on site). Increasing the HP/LP gas
pipe size is not allowed.
■ If the increased liquid pipe size is larger than the pipe size of the main liquid pipe, then the pipe size of
the main liquid pipe needs to be increased as well.
■ If the increased suction gas pipe size is larger than the pipe size of the main suction gas pipe, then the
allowable length after the first refrigerant branch kit may not be increased to 90 m.
Size-up of the main suction gas pipe may affect a good oil return to the outdoor unit due to influence of
the HP/LP gas pipe.
indoor unit 8:
b+c+d+e+f+g+p≤90 m
increase the pipe size
of b, c, d, e, f, g
Increase the pipe size as follows
For calculation of total extension length, the actual length of above pipes must be doubled (except length of
main pipes and of pipes which do not have an increased pipe size).
a+b*2+c*2+d*2+e*2+f*2+g*2
+h+i+j+k+l+m+n+p≤1000 m
Indoor unit to the nearest branch kit ≤40 m h, i, j....... p≤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
The most remote indoor unit 8
The nearest indoor unit 1
(a+b+c+d+e+f+g+p)–(a+h)≤40 m
A
B
C
C
R =
A
>100%
≤130%
0.5 kg
[(X1 x Ø22.2) x0.37] + [(X2 x Ø19.1) x0.26] + [(X3 x Ø15.9) x0.18] +
[(X
4 x Ø12.7) x0.12] + [(X5 x Ø9.5) x0.059] + [(X6 x Ø6.4) x0.022]
x 1.02 + 3.6
+ A
X1...6 = Total length (m) of liquid piping size at Øa
A = Weight according to table A in function of indoor unit connection ratio
8+10
12~16
9.5 ➞ 12.7
12.7 ➞ 15.9
REYQ Ø
1
6
2
54
3
1 Outdoor unit 4 First refrigerant
branch kit
2 Main pipes
3 Increase only liquid
pipe size
5 BS unit
6 Indoor unit
Ø9.5 ➞ Ø12.7 Ø12.7 ➞ Ø15.9 Ø15.9 ➞ Ø19.1 Ø19.1 ➞ Ø22.2
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)
To Next Page
Loading...
