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Instalation 1
Inverter Series (CU-8 · 10MX, CU-8 · 10MC)
EXAMPLE OF CONNECTION
(When 8 indoor units are connected)
Actual pipe length
Maximum
Between outdoor and indoor
allowable
units
length
Equivalent length
Between outdoor and indoor units
Difference in height
Allowable
height
length
Between adjacent indoor units
Difference in height
Allowable length after the branch
Actual pipe length
Refrigerant branch kit selection
Example of downstream indoor units
Outline of selecting pipe size
Outline of how to compute quantity of refrigerant to be charged
additionally.
Quantity of additional charge R (kg)
Total
Total
Total
length of
length of
length of
R=
+
+
×0.1
×0.05
12.7mm
9.5mm
6.4mm
dia. liquid line
dia. liquid line
dia. liquid line
•Round off R to one decimal place.
•When R is zero or smaller, keep the unit in operation.
56
Branch using Line branch pipes
Pipe length between outdoor and indoor units
8 :a+ b+c+d+e+f+g+p ≤ 100m
(Example)
Equivalent pipe length between outdoor and indoor units 125m or less (Assume equivalent pipe length of Line branch pipes to be 0.5m, that of Header branch pipes to be 1m, computation purposes)
Difference in height between outdoor and indoor units (H1) 50m or less (40m or less when outdoor unit is located in a lower position)
Difference in height between adjacent indoor units (H2) 15m or less
Pipe length from first refrigerant branch kit (either Line branch pipes or Header branch pipes) to indoor unit
8 :b+c+d+e+f+g+p ≤ 40m
(Example)
How to select Line branch pipes
• When using Line branch pipes at the first branch counted from the outdoor unit side, use KHRP26K37T.
(Example: Line branch pipes A)
• In the case of Line branch pipes other than the first branch, select the proper branch kit model based on
the total capacity sum (for computation) of the indoor units installed after the first branch using the
following table. (For the total capacity, see the item 1 in the section under "COMBINATION" at the
beginning.)
Total capacity sum of indoor units
Less than 160
160 or more
(Example) In case of Line branch pipes C
Indoor units 3 + 4 + 5 + 6 + 7 + 8 .
Between outdoor unit and uppermost stream refrigerant branch kit
• Match the pipe size to that connected to outdoor unit.
Pipe size connected to outdoor unit.
Pipe size (Outer diameter × minimum wall thickness)
Model name
Gas pipe
φ 2 5 . 4 × 1 . 2
CU-8MX, CU-8MC
φ 2 8 . 6 × 1 . 2
CU-10MX, CU-10MC
(Example)
a : φ 1 2 . 7 × 3 0 m
e : φ 9 . 5 × 3 m
i : φ 6 . 4 × 5 m
b : φ 1 2 . 7 × 5 m
f : φ 9 . 5 × 2 m
j : φ 6 . 4 × 5 m
c : φ 1 2 . 7 × 5 m
g : φ 9 . 5 × 5 m
k : φ 6 . 4 × 5 m
d : φ 1 2 . 7 × 5 m
h : φ 9 . 5 × 5 m
l : φ 9 . 5 × 5 m
×0.025
-2
R = 45×0.1 + 20×0.05 + 30×0.025 -2 =
4.25
↑
↑
↑
a+b+c+d
e+f+g+h+i
i+j+k+l+m+n+p
4.3kg
Branch using Line branch pipes and Header branch pipes
100m or less
1 :a+b+h ≤ 100m, 7 :a+i+j ≤ 100m
(Example)
40m or less
6 :b+h ≤ 40m, 7 :i+k ≤ 40m
(Example)
How to select Header branch pipes
• Select the proper branch kit model based on the total capacity sum (for computation) of the indoor units
installed after the header using the following table. (For the total capacity, see the item 1 in the section
under "COMBINATION" at the beginning.)
• Branching is impossible between Header branch pipes and indoor unit.
Refrigerant branch kit No. to be used
KHRP26K18T
KHRP26K37T
(Example) In the case of Line branch pipes B Indoor units 7 + 8 .
(Example) In the case of Header branch pipes
Indoor units 1 + 2 + 3 + 4 + 5 + 6 .
Between two immediately adjacent refrigerant branch kits.
• Select the proper pipe size based on the total capacity sum (for computation) of the
indoor units connected downstream using the following table. (For the total capacity
see the item in the selection under "COMBINATION" at the beginning.)
(Unit:mm)
Total capacity sum of
Pipe size (Outer diameter × minimum wall thickness)
Liquid pipe
indoor units
Gas pipe
φ 15.9×1.0
Less than 100
φ 12.7× 0.9
φ 19.1×1.0
100 or more to 160 (160 excluded)
φ 25.4×1.2
160 or more
(Example)
m : φ 6 . 4 × 5 m
a : φ 1 2 . 7 × 3 0 m
d : φ 6 . 4 × 1 0 m
g : φ 6 . 4 × 1 0 m
n : φ 6 . 4 × 5 m
b : φ 1 2 . 7 × 1 0 m
e : φ 6 . 4 × 1 0 m
h : φ 6 . 4 × 2 0 m
o : φ 6 . 4 × 5 m
c : φ 9 . 5 × 1 0 m
f : φ 6 . 4 × 1 0 m
i : φ 9 . 5 × 1 0 m
R= 40×0.1 + 30×0.05 + 69×0.025 -2 =
↑
↑
↑
a+b
c+i+j
d+e+f+g+h+k
Branch using Header branch pipes
8 :a+i ≤ 100m
(Example)
8 :i ≤ 40m
(Example)
Total capacity sum of indoor units
Refrigerant branch kit No. to be used
Less than 160
KHRP26K18H (Up to 6 branches)
160 or more
KHRP26K37H (Up to 8 branches)
(Example) In the case of Header branch pipes
Indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 .
Between refrigerant branch kit and indoor unit
• Pipe size for direct connection to indoor unit must be the same as
the connection size of indoor unit.
(Unit:mm)
Connection pipe size of indoor unit
Indoor unit capacity
Pipe size (Outer diameter × minimum wall thickness)
Liquid pipe
sum of indoor units
Gas Pipe
φ 12.7×0.9
20 · 25 · 32 · 40
φ 9.5×0.8
φ 15.9×1.0
50 · 63 · 80
φ 12.7×0.9
φ 19.1×1.0
100 · 125
φ 25.4×1.2
200
φ 28.6×1.2
250
(Example)
j : φ 9 . 5 × 1 0 m
a : φ 1 2 . 7 × 4 0 m
d : φ 6 . 4 × 1 0 m
h : φ 6 . 4 × 2 0 m
k : φ 6 . 4 × 9 m
b : φ 9 . 5 × 2 0 m
f : φ 6 . 4 × 2 0 m
i : φ 6 . 4 × 2 0 m
c : φ 9 . 5 × 1 0 m
g : φ 6 . 4 × 2 3 m
j : φ 6 . 4 × 3 0 m
5.225
R= 40×0.1 + 30×0.05 + 123×0.025 -2 =
↑
↑
↑
5.2kg
a
b+c
d+e+f+g+h+i
PACD011001G2 / PACD011004G3
(Unit:mm)
Liquid pipe
φ 6.4×0.8
φ 9.5×0.8
φ 12.7×0.9
φ 12.7× 0.9
6.575
6.6kg
(M009)
Urban Multi Inverter "MX1" Series
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