English
10
Required Conditions
Example Dr
a
wings
1.
It is necessa
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
ve
r,
the pipes that are same pipe siz
e with main pipe m
ust
not be increased
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
[Outside unit to the f
a
rthest indoor unit]
and [Outside 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+l+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
l
m
n
12
34
56
7
8
H1
p
Outside 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
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
7/8)
(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
3/4)
(Total length (ft)
of liquid piping
size at
φ
1/2)
(Total length (ft)
of liquid piping
size at
φ
1/4)
0.249
0.121
0.040
0.175
0.081
0.015
HEAT PUMP SYSTEM
MODEL NAME
MODEL NAME
THE AMOUNT OF
REFRIGERANT
RXYQ72 ~ 108PAYD
RXYQ72 ~ 108PATJ
RXYQ144 ~ 192PAYD
RXYQ144 ~ 192PATJ
—
2.2 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
RXYQ72 ~ 192PAYD
RXYQ72 ~ 192PATJ
1.1 lb
1.1 lb
Example for refrigerant branch using REFNET joint and REFNET heder for systems and each pipe length as shown below.
Outside system : RXYQ192PAYD
Total capacity of indoor unit : 116%
a :
φ
3/4 × 15ft.
b :
φ
3/4 × 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.
l :
φ
3/8 × 10ft.
m :
φ
3/8 × 10ft.
n :
φ
3/8 × 5ft.
o :
φ
1/4 × 5ft.
p :
φ
1/4 × 5ft.
r :
φ
1/2 × 1ft.
s :
φ
3/8 × 1ft.
t :
φ
3/8 × 1ft.
u :
φ
5/8 × 1ft.
Note 1.
When the equivalent pipe length between outside and indoor units is 295 ft or more,
the size of main pipes (both gas side and liquid side (refer to figure 16)
must be increased according to the right table.
(Refer to figure 16)
1.Outdoor unit
2.Main pipes
3.Increase
4.First refrigerant branch kit
5.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
RXYQ72PA type
RXYQ96PA type
RXYQ108PA type
RXYQ144PA type
RXYQ168PA type
RXYQ192PA type
Gas pipe
φ
3/4
→
φ
7/8
φ
7/8
→
φ
1
Not Increased
φ
1-1/8
→
φ
1-1/4
φ
1-1/8
→
φ
1-1/4
φ
1-1/8
→
φ
1-1/4
Liquid pipe
φ
3/8
→
φ
1/2
φ
3/8
→
φ
1/2
φ
1/2
→
φ
5/8
φ
1/2
→
φ
5/8
φ
5/8
→
φ
3/4
φ
5/8
→
φ
3/4
R
=
(
25 × 0.175 + 1 × 0.121 + 1 × 0.081 + 75 × 0.040 + 10 × 0.015 ) + 2.2 + 1.1
a, b
u
r
c~n, s, t
o, p
RXYQ192PATJ
116%
= 11.027
11.0lb
Round off in units of 0.1 lb.
