REMQ8~16P7Y1B
VRVIII System air conditioner
4PW37156-1
Installation manual
10
Pipe siz
e selection
F
or an outdoor unit m
ulti installation (REYQ20~48P), 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 outdoor unit total capacity type
, connected
do
wnstream.
Outdoor unit
capacity type (hp)
Piping outer diameter siz
e (mm)
Indoor unit capacity
type (kW)
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
Piping temper grade and wall thic
kness
24
34.9
28.6
15.9
≥
920
41.3
28.6
19.1
Te
mper g
rade:
O type and 1/2 H type indicate the mater
ial type
26~34
34.9
28.6
19.1
Copper tube
(Ø mm)
Te
mper grade
type
W
all thic
kness
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 outdoor unit.
38~48
41.3
34.9
19.1
6.4
O
0.80
Indoor unit capacity
type (kW)
Piping outer diameter siz
e (mm)
9.5
O
0.80
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
12.7
O
0.99
20, 25, 32, 40, 50
12.7
6.4
22.2
1/2 H
0.80
Outdoor unit
capacity type (hp)
Piping outer diameter siz
e (mm)
63, 80, 100, 125
15.9
9.5
28.6
1/2 H
0.99
Suction gas pipe
HP/LP gas pipe
Liquid pipe
200
19.1
9.5
31.8
1/2 H
1.10
8+10
22.2
19.1
9.5 x 0.8
250
22.2
9.5
34.9
1/2 H
1.21
12
28.6
19.1
12.7
38.1
1/2 H
1.32
14+ 16
28.6
22.2
12.7
D:
Equaliz
er piping (outdoor units onl
y)
41.3
1/2 H
1.43
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 refrig
erant branc
h using refnet joint and refnet header
for REYQ34 (REYQ34 = REMQ8+REMQ16)
If the outdoor unit is REYQ34 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
pipes of the liquid side 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 pipes
.
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 betw
een the first br
anch kit and the final br
anch kit.
(Reducers
m
ust be procured on site
.) Ho
w
e
v
e
r,
if the pipes are of the same pipe siz
e as the main pipe there is no
need to increase the pipe siz
e
.
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
* If a
v
ailab
le on the site
. Otherwise it can not be increased.
F
or calculation of total e
xtension length, the actual length of abo
v
e
pipes m
ust be doub
led.
(e
xcept main
pipe and the pipes that not increase the 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%
≤
120%
0.5
kg
>120%
≤
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:
Indoor 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
Ø15.9
➞
Ø19.1
Ø22.2
➞
Ø25.4*
Ø34.9
➞
Ø38.1*
Ø12.7
➞
Ø15.9
Ø19.1
➞
Ø22.2
Ø28.6
➞
Ø31.8*
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)
