Daikin VRV III REMQ120PBTJ, Engineering Data

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Installation EDUS391004-N
78 Installation of Outdoor Units
Required Conditions
Example Dr
a
wings
1.
It is necessar
y to increase the pipe siz
e if the pipe length
betw
een the first br
anch kit and the final br
anch kit is o
ver than
130 ft.
(Reducers m
ust be procured on site)
If the increased pipe siz
e is larger than main pipe siz
e
, then
increase the main pipe siz
e to the same pipe siz
e
.
2. For calculation of Total extension length, the actual length of
above pipes must be doubled. (except main pipe and the pipes that are not increased)
3.
Indoor unit to the nearest br
anch kit
≤
130 ft.
4.
The diff
erence betw
een
[Outdoor unit to the f
a
rthest indoor unit]
and [Outdoor unit to the nearest indoor unit]
≤
130 ft.
8 b+c+d+e+f+g+p
≤
295 ft.
increase the pipe siz
e of b
, c
, d, e
, f
, g
a+b×2+c×2+d×2+e×2+f×2+g×2 +h+i+j+k+ +m+n+p
≤
3280 ft.
h, i, j.......
p
≤
130 ft.
The f
a
rthest indoor unit 8
The nearest indoor unit 1 (a+b+c+d+e+f+g+p)-(a+h)
≤
130 ft.
Increase the pipe siz
e as f
ollo
ws
φ
3/8
→ φ
1/2
φ
1/2
→ φ
5/8
φ
5/8
→ φ
3/4
φ
3/4
→ φ
7/8
φ
7/8
→ φ
1*
φ
1-1/8
→ φ
1-1/4*
φ
1-3/8
→ φ
1-1/2*
a
AB
C
D
E
F
G
bcd
e
f
g
hi
j
k
m
n
12
34
56
7
8
H1
p
Outdoor unit
REFNET joint (A-G)
Indoor units ( 1 - 8 )
*If a
vailab
le on the site
, use this siz
e
. Otherwise it can not be increased.
How to calculate the additional refrigerant to be charged
[HEAT RECOVER SYSTEM] Additional refrigerant to be charged : R(lb) R should be rounded off in units of 0.1 lb.
R =
(Total length (ft) of liquid piping size at
φ
5/8)
(Total length (ft) of liquid piping size at
φ
3/8)
(Total length (ft) of liquid piping size at
φ
1/2)
(Total length (ft) of liquid piping size at
φ
1/4)
0.121
0.040
0.081
0.015
1.02
HEAT RECOVER SYSTEM
MODEL NAME
THE AMOUNT OF
REFRIGERANT
REYQ72 ~ 120PBYD REYQ72 ~ 144PBTJ
7.9 lb
REFRIGERANT AMOUNT FOR EXCEEDING CONNECTION CAPACITY OF INDOOR UNIT INDOOR CONNECTION CAPACITY MORE THAN 100% 120% OR LESS MORE THAN 120% 130% OR LESS
MODEL NAME
REYQ72 ~ 120PBYD
REYQ72 ~ 144PBTJ
1.1 lb 1.1 lb
Example for refrigerant branch using REFNET joint and REFNET header for systems and each pipe length as shown below.
Outdoor system : REYQ120PBYD Total capacity of indoor unit : 116%
a :
φ
3/8 × 15ft.
b :
φ
3/8 × 10ft.
c :
φ
3/8 × 5ft.
d :
φ
3/8 × 5ft.
e :
φ
3/8 × 5ft.
f :
φ
3/8 × 5ft.
g :
φ
3/8 × 5ft.
h :
φ
3/8 × 5ft.
i :
φ
3/8 × 5ft.
j :
φ
3/8 × 5ft.
k :
φ
3/8 × 10ft.
:
φ
3/8 × 10ft.
m :
φ
1/2 × 10ft.
n :
φ
3/8 × 5ft.
o :
φ
1/4 × 5ft.
p :
φ
1/2 × 5ft.
Note 1.
When the equivalent pipe length between outdoor and indoor units is 295 ft or more, the size of main pipes on the liquid side (refer to figure 15) must be increased according to the right table. (Never increase suction gas pipe and HP/LP gas pipe.) (Refer to figure 15) 1.Outdoor unit 2.Main pipes 3.Increase only liquid pipe size 4.First refrigerant branch kit 5.BS unit 6.Indoor unit
Note 2.
Allowable length after the first refrigerant branch kit to indoor units is 130 ft or less, however it can be extended up to 295 ft if all the following conditions are satisfied. (In case of "Branch with REFNET joint")
System
REYQ72 · 96P type REYQ120 · 144P type
Liquid pipe
φ
3/8
→
φ
1/2
φ
1/2
→
φ
5/8
R
=
(
10 × 0.081 + 90 × 0.040 + 5 × 0.015 ) × 1.02 + 7.9 + 1.1
m
a~ , n
o
REYQ120PBYD
116%
= 13.574
13.6 lb
Round off in units of 0.1 lb.
3P215731-12R
*If the increa
sed pip
e
size is
la
rger than
the
main
p
ipe
size,
increase
the
mai
n
p
ipe
size
to
th
e
same
as the
in
creased
size
.
If the speci
fie
d pipe
d
iameter is not
a
v
aila
ble
on
site, do
NOT
sub
s
titute a pip
e
of
gre
a
ter
d
iameter.