Installation manual
8
REYQ8~16P8Y1B
VRVIII System air conditioner
4PW39996-1A
Pipe siz
e selection
F
or an outdoor unit, select the pipe siz
e in accordance with
the f
ollo
wing figure
.
A.
Piping between outdoor unit and refrigerant branc
h kit
Choose from the f
ollo
wing tab
le in accordance with the outdoor unit total capacity type
, connected
do
wnstream.
B.
Piping between refrig
erant branc
h kit and BS unit
Pipe siz
e f
or direct connection to indoor unit m
ust be the same as the connection siz
e of indoor unit.
Choose from the f
ollo
wing tab
le in accordance with the indoor unit total capacity type
, connected
do
wnstream.
Outdoor unit
capacity type (Hp)
Piping outer diameter siz
e (mm)
Indoor unit
capacity type
Piping outer diameter siz
e (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 refrig
erant branc
h kit or BS unit and indoor unit
Choose from the f
ollo
wing tab
le 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 siz
e (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
Ho
w to calculate the ad
ditional refrig
erant to be c
har
g
e
d
Additional refr
iger
ant to be charged R (kg)
R should be rounded off in units of 0.1 kg
Note 1
When the equiv
alent pipe length betw
een outdoor and indoor units is 90 m or more
, the siz
e of the main
liquid pipe m
ust be increased.
Ne
v
er increase suction gas pipe and HP/LP gas pipe siz
es
.
Depending on the length of the piping, the capacity ma
y drop
, b
ut e
v
en in such a case it is possib
le to
increase the siz
e of the main liquid pipe
.
Note 2
Allo
w
a
b
le length after the first refr
iger
ant br
anch kit to indoor units is 40 m or less
, ho
w
e
v
er it can be e
xtended up to 90 m i
f all the f
ollo
wing conditions are fulfilled.
Required conditions
Example dra
wings
It is necessar
y to increase the pipe siz
e of the liquid and suction gas pipe if the pipe length betw
een the
first and the final br
anch kit is o
v
er 40 m (reducers m
ust be procured on site).
Increasing the HP/LP gas
pipe siz
e is not allo
w
ed.
■
If the increased liquid pipe siz
e is larger than the pipe siz
e of the main liquid pipe
, then the pipe siz
e of
the main liquid pipe needs to be increased as w
ell.
■
If the increased suction gas pipe siz
e is larger than the pipe siz
e of the main suction gas pipe
, then the
allo
w
a
b
le length after the first refr
iger
ant br
anch kit ma
y not be increased to 90 m.
Siz
e-up of the main suction gas pipe ma
y aff
ect a good oil retur
n 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 siz
e
of b
, c
, d, e
, f
, g
Increase the pipe siz
e as f
ollo
ws
F
or calculation of total e
xtension length, the actual length of abo
v
e
pipes m
ust be doub
led (e
xcept length of
main pipes and of pipes which do not ha
v
e
an increased pipe siz
e).
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 br
anch kit
≤
40 m
h, i, j.......
p
≤
40 m
The diff
erence betw
een the distance of the outdoor unit to the f
a
rthest 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
[(X
1
x
Ø22.2
) x0.37] + [(X
2
x
Ø19.1
) x0.26] + [(X
3
x
Ø15.9
) x0.18] +
[(X
4
x
Ø12.7
) x0.12] + [(X
5
x
Ø9.5
) x0.059] + [(X
6
x
Ø6.4
) x0.022]
x 1.02 + 3.6
+ A
X
1...6
=
T
otal length (m) of liquid piping siz
e at
Øa
A
=
W
eight according to tab
le A in function of indoor unit connection r
atio
8+10
12~16
9.5
➞
12.7
12.7
➞
15.9
REYQ
Ø
1
6
2
5
4
3
1
Outdoor unit
4
First refr
iger
ant
br
anch kit
2
Main pipes
3
Increase only liquid
pipe siz
e
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
AB
C
D
E
F
G
12
3
4
5
6
7
8
H2
hi
j
k
l
m
n
1
2
3
1
Outdoor unit
2
Refnet joints (a~g)
3
Indoor units (1~8)
Summary of Contents for VRVIII REYQ-P8
Page 32: ...4PW39996 1A Copyright Daikin...
