Table of Contents
Heat Pump 60Hz (RXYQ5~54P)
2.6.5 E
XAMPLE OF
Example of connection
(Connection of 8 indoor units)
(∗1) "
" indicate the Outdoor unit multi
connection piping kit
(∗2) In case of multi outdoor system, re-read to the first
Outdoor unit multi connection piping kit as seen
from the indoor unit.
Between outdoor (∗2)
Maximum
and indoor units
allowable
length
Between outdoor unit and Outdoor unit multi
connection piping kit (Only for multi system)
Between outdoor and indoor units
Allowable
height
Between indoor and indoor units
length
Between outdoor and outdoor units
Allowable length after the branch
Refrigerant branch kit selection
Refrigerant branch kits can only be
used with R-410A.
• When multi outdoor system are installed, be sure to
use the special separately sold Outdoor unit multi
connection piping kit.
The table at right shows how to select the proper kit.
Example for indoor units connected downstream
Pipe size selection
Caution
The thickness of the pipes in the table shows the requirements of Japanese
High Pressure Gas Control low. (As of Jan. 2003)
The thickness and material shall be selected in accordance with local code.
For the multi outdoor unit system, select in accordance with the following figure.
Part A
How to calculate the additional refrigerant to be
charged
Additional refrigerant to be charged R (kg)
(R should be rounded off in units of 0.1Kg.)
282
C
)
ONNECTION
Single outdoor
system
Multi outdoor
system
Actual pipe length
Equivalent length
Total extension length
Actual pipe length
Equivalent length
Difference in height
Difference in height
Difference in height
Actual pipe length
Part B
Part C
Example refrigerant branch using REFNET joint
Outdoor unit
a
b
c
d
e
A
B
C
D
h
i
j
k
1
2
3
4
Indoor units ( 1 - 8 )
Outdoor unit
a
b
c
A
B
C
h
i
j
First Outdoor unit
1
2
multi connection
Indoor units ( 1 - 8 )
piping kit
Pipe length between outdoor (∗2) and indoor units ≤ 165m
Example unit 8 : a + b + c + d + e + f + g + p ≤ 165m
Equivalent pipe length between outdoor (∗2) and indoor units ≤ 190m (assume equivalent p
Total pipe length from outdoor unit (∗2) to all indoor units ≤ 1000m
Pipe length between outdoor unit and Outdoor unit multi connection piping kit ≤ 10m, Equiv
Difference in height between outdoor and indoor units (H1) ≤ 50m
Difference in height between indoor units (H2) ≤ 15m
Difference in height between outdoor unit (H3) ≤ 5m
Pipe length from first refrigerant branch kit (either REFNET joint or REFNET header ) to ind
Example unit 8 : b + c + d + e + f + g + p ≤ 40m
How to select the REFNET joint
• When using REFNET joint at the first branch counted from the outdoor unit side.
Choose from the following table in accordance with the outdoor unit capacity type.
(Example: REFNET joint A)
Outdoor unit capacity type
5HP type
8, 10HP type
12~22HP type
24HP type~
• Choose the REFNET joints other than that for the first branch from the following table in a
capacity index of all the indoor units connected below the REFNET joint.
Indoor unit total capacity index
< 200
200 ≤ x< 290
290 ≤ x< 640
640 ≤
Example REFNET joint C: indoor units
Temper grade and wall thickness for pipes.
(Temper grade, O type and 1/2H type indicate the material types specified in JIS
H 3300.)
Copper tube W.T.
Copper tube O.D.
(Minimum requirement)
φ6.4
φ9.5
φ12.7
φ15.9
φ19.1
φ22.2
φ25.4
φ28.6
φ31.8
φ34.9
φ38.1
φ41.3
⎛
⎞
⎛
Total length (m)
Total length (m)
⎜
⎟
⎜
R=
+
of liquid piping
of liquid piping
×0.37
⎝
⎠
⎝
size at φ22.2
size at φ19.1
⎛
⎞
Total length (m)
⎜
⎟
+
of liquid piping
×0.022
⎝
⎠
size at φ6.4
SiEN34-705
REFNET joint (A-G)
g
f
H1
E
F
G
p
l
m
n
5
6
7
H2
8
REFNET joint (A-G)
H3
H1
d
e
f
g
E
F
G
D
p
k
l
m
n
3
4
5
6
7
H2
8
( ≤ 90m if the outdoor
Refrigerant branch kit na
KHRP26A22T
KHRP26A33T
KHRP26A72T
KHRP26A73T + KHR
Refrigerant branch kit na
KHRP26A22T
KHRP26A33T
KHRP26A72T
KHRP26A73T + KHR
3 + 4 + 5 + 6 + 7 + 8
(Unit:mm)
Temper grade
0.80
0.80
O type
0.80
0.99
0.80
0.80
0.88
0.99
1/2H type
1.10
1.21
1.32
1.43
⎞
⎛
Total length (m)
⎟
⎜
+
of liquid piping
×0.26
⎠
⎝
size at φ15.9
Installation Manual
Examp
Exam
Examp
Examp
Examp
Piping
Piping
branch
• Cho
Pipin
Pipin
• Cho
the o
Ou
(See
⎞
⎛
⎟
⎜
+
×0.18
⎠
⎝
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