REMQ8~16P8Y1B
VRVIII System air conditioner
4PW40598-1A
Installation manual
10
Pipe siz
e selection
F
or an outdoor unit m
ulti installation (REYQ18~48P),
select the pipe siz
e in accordance with the f
ollo
wing figure
.
A.
Piping between outdoor unit and refrigerant branc
h kit
B.
Piping between outdoor unit m
ulti connection piping units
Choose from the f
ollo
wing tab
le in accordance with the outdoor unit total capacity type
, connected
do
wnstream.
E.
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
18
28.6
22.2
15.9
420
≤
x<640
28.6
28.6
15.9
20+22
28.6
28.6
15.9
640
≤
x<920
34.9
28.6
19.1
24
34.9
28.6
15.9
≥
920
41.3
28.6
19.1
26~34
34.9
28.6
19.1
36
41.3
28.6
19.1
F.
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.
38~48
41.3
34.9
19.1
Indoor unit
capacity type
Piping outer diameter siz
e (mm)
C.
Piping between outdoor unit m
ulti connection piping kit and outdoor unit
Choose from the f
ollo
wing tab
le in accordance with the capacity type of the connected outdoor unit.
Suction gas pipe
Liquid pipe
20, 25, 32, 40, 50
12.7
6.4
Outdoor unit
capacity type (Hp)
Piping outer diameter siz
e (mm)
63, 80, 100, 125
15.9
9.5
Suction gas pipe
HP/LP gas pipe
Liquid pipe
200
19.1
9.5
8+10
22.2
19.1
9.5
250
22.2
9.5
12
28.6
19.1
12.7
14+16
28.6
22.2
12.7
D.
Equaliz
er piping (outdoor units onl
y)
Piping outer diameter siz
e (mm)
19.1
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
Example
f
or refr
iger
ant br
anch using refnet joint and refnet header f
or
REYQ34.
REYQ34 = REMQ8+REMQ16, the indoor unit
connection r
atio = 120% and the piping lengths are as belo
w
.
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
C
A
B
E
F
C
C
D
D
F
The refr
iger
ant charge of the system m
ust be less than
100 kg.
This means that in case the calculated
refr
iger
ant charge is equal to or more than 95
kg y
ou
m
ust divide y
our m
ultiple outdoor system into smaller
independent systems
, each containing less than 95 kg
refr
iger
ant charge
.
F
or f
actor
y charge
, ref
er to the unit name plate
.
R
=
REYQ
18+20 Hp
22+24 Hp
26 Hp
28+30 Hp
32~40 Hp
42 Hp
44+46 Hp
48 Hp
18~32 Hp
34~48 Hp
B
>100%
≤
130%
0.5
kg
>100%
≤
120%
0.5
kg
>120%
≤
130%
1.0
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]
+ A + B
x 1.02
REYQ
A
1.0
kg
1.5
kg
2.0
kg
2.5
kg
3.0
kg
3.5
kg
4.0
kg
4.5
kg
X
1...6
=
T
otal length (m) of liquid piping siz
e at
Øa
A
=
W
eight according to tab
le A
B
=
W
eight according to tab
le B in function of indoor unit connection r
atio
R
= [
[50x0.26]+[1x0.18]+[3x0.12]+[156x0.059]+[20x0.022]
]x1.02
+3.0+0.5
a :
Ø19.1x30
m
b :
Ø19.1x20
m
c :
Ø9.5x10
m
f :
Ø9.5x10
m
g :
Ø9.5x10
m
h :
Ø9.5x10
m
k :
Ø9.5x20
m
l :
Ø9.5x20
m
p :
Ø6.4x10
m
r :
12.7x3
m
m:
Ø9.5x20 m
s
: Ø9.5x3 m
u :
Ø15.9x1
m
d :
Ø9.5x10
m
e :
Ø9.5x10
m
i :
Ø9.5x10
m
j :
Ø9.5x10
m
n
: Ø9.5x10 m
t
: Ø9.5x3 m
o :
Ø6.4x10
m
= 27.148
⇒
R = 27.1 kg
8+10
12~16
9.5
➞
12.7
12.7
➞
15.9
18~24
26~48
15.9
➞
19.1
19.1
➞
22.2
REYQ
Ø
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)