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NOTES:
• If the outdoor temperature during cooling operation is expected to be
–5 °C or less, outdoor unit must be installed lower than 5 m or less from the indoor unit.
• Please refer to "8.3.2. Checking total amount of refrigerant and calculating the amount
of refrigerant charge to be added" for the total amount of refrigerant.
4.2. Pipe selection
This unit is designed specifically for use with the R410A refrigerant. Pipes for R407C or
R22 may not be used with this unit. Do not use existing pipes. Improper pipe selection
will degrade performance.
(Primary)
(Subordinate 1) (Subordinate 2)
O.U.
Outdoor unit
-1
branch kit
(optional)
First separation
tube (optional)
I.U.
I.U.
I.U.
(Wall thickness and pipe material for each diameter)
Outside Diameter mm 6.35
9.52 12.70 15.88 19.05 22.22 28.58 34.92 41.27
Wall Thickness
mm
0.8
0.8
(
*3)
COPPER (
*1)
Material
JIS H3300 C1220T-O or equiva-
lent
*1: Allowable tensile stress ≥ 33 (N/mm²)
*2: Allowable tensile stress ≥ 61 (N/mm²)
*3: Endurance pressure of the pipes 4.2 MPa
Select the pipe size in accordance with local rules.
Table. A (Between outdoor unit and outdoor unit branch kit)
Outdoor unit
Outside diameter mm (in)
HP
cooling capacity
Liquid pipe
(kW)
8
22.4
12.70 (1/2")
10
28.0
12.70 (1/2")
12
33.5
12.70 (1/2")
14
40.0
12.70 (1/2")
16
45.0
12.70 (1/2")
*4: For the installation method, refer to "5.4. Multiple connections".
Table. B (Between outdoor unit branch kits or outdoor unit branch kit and
first separation tube)
Total cooling capacity of outdoor unit (kW)
22.4 to 28.0
28.1 to 45.0
45.1 to 56.0
56.1 to 80.0
80.1 to 96.0
96.1 or more
Table. C (Between separation tubes)
Total cooling capacity of indoor unit (kW)
2.2 to 11.1
11.2 to 13.9
14.0 to 19.6
19.7 to 28.0
28.1 to 44.7
44.8 to 56.0
56.1 to 80.0
80.1 to 95.0
95.1 or more
* If the selected pipe diameter between separation tubes (based on table "C1") becomes
larger than the pipe diameter between outdoor unit branch kit and the first separation
tube (based on table "B1"), please select the pipe whose diameter is equal to the one
between outdoor unit branch kit and the first separation tube.
(If pipe diameter C1 > B1, select pipe size from table B1)
* Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
En-7
CAUTION
O.U.: Outdoor unit
O.U.
O.U.
I.U.: Indoor unit
-2
-3
Pipe size (table A)
Pipe size (table B)
Separation tube
(optional)
Pipe size (table C)
Pipe size (table D)
I.U.
I.U.
I.U.
0.8
1.0
1.2
1.0
1.0
COPPER (
*2)
JIS H3300 C1220T-H or
equivalent
Branch kit (
Gas pipe
22.22 (7/8")
22.22 (7/8")
28.58 (1-1/8")
UTP-CX567A
28.58 (1-1/8")
28.58 (1-1/8")
Outside diameter (mm)
Liquid pipe
12.70 (1/2")
22.22 (7/8")
12.70 (1/2")
28.58 (1-1/8")
15.88 (5/8")
28.58 (1-1/8")
15.88 (5/8")
34.92 (1-3/8")
19.05 (3/4")
34.92 (1-3/8")
19.05 (3/4")
41.27 (1-5/8")
Outside diameter (mm)
Liquid pipe
9.52 (3/8")
15.88 (5/8")
9.52 (3/8")
19.05 (3/4")
12.70 (1/2")
19.05 (3/4")
12.70 (1/2")
22.22 (7/8")
12.70 (1/2")
28.58 (1-1/8")
15.88 (5/8")
28.58 (1-1/8")
15.88 (5/8")
34.92 (1-3/8")
19.05 (3/4")
34.92 (1-3/8")
19.05 (3/4")
41.27 (1-5/8")
Table. D (Between separation tube to indoor unit)
Model code
04, 07, 09, 12, 14
18, 24, 30, 34
36, 45, 54, 60
72, 90, 96
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
Table. E (Separation tube / Header)
Separation tube
Total cooling ca-
pacity of indoor
unit (kW)
19.6 or less
28.0 or less
28.1 to 56.0
56.1 or more
*5: For the installation method, refer to the section on "Indoor unit pipe connections"
below.
Table. F (Indoor unit capacity comparison table - The indication of power is
different depending on the model.)
Model code of
indoor unit
Capacity [kW] 1.1 2.2 2.8 3.6 4.5 5.6 7.1 9.0 10.0 11.2 12.5 14.0 18.0 22.4 25.0 28.0
1.2
1.43
In the case of ARXD007GLEH: equivalent to model code of indoor unit
Outdoor air unit
Connectable unit within 1 refrigerant system
Unit
Only Outdoor air unit
Outdoor air unit
+ Indoor unit
*4)
4.3. Downsizing of pipe diameter
Note:
Reducers are field supplied.
• Downsizing of the liquid and gas pipe can be done in "4.2 Pipe selection", if pipe length
is limited as below in "4.1 System configuration".
• Allowable downsizing are indicated by "→" in table A2, B2, C2, D2.
Gas pipe
Gas pipe
Outdoor unit
branch kit
(optional)
First separation
tube (optional)
I.U.
Cooling capacity of
indoor unit (kW)
1.1, 2.2, 2.8, 3.6, 4.5
5.6, 7.1, 9.0, 10.0
11.2, 12.5, 14.0, 18.0
22.4, 25.0, 28.0
Header
Total cooling ca-
Separation
pacity of indoor
tube (
*5)
unit (kW)
UTP-AX054A
28.0 or less
UTP-AX090A
28.1 to 56.0
UTP-AX180A
UTP-AX567A
04/
07/
09/
12/
14/
18/
24/
30/
34/
004
007
009
012
014
018
024
030
034
Model code 007 → Capacity=2.2 kW
Connectable cooling
capacity range
50% to 100%
The capacity of "Outdoor air unit"
50% to 100%
should be less than 30% of the
outdoor unit capacity.
(Primary)
(Subordinate)
a
b
Outdoor unit
Indoor unit
e
f
g
j
i
h
I.U.
I.U.
I.U.
I.U.
p
l
m
n
I.U.
I.U.
I.U.
(Primary)
(Subordinate 1) (Subordinate 2)
O.U.
O.U.
O.U.
-1
-2
-3
Separation tube
(optional)
I.U.
I.U.
I.U.
I.U.
I.U.
Outside diameter mm (in)
Liquid pipe
Gas pipe
6.35 (1/4")
12.70 (1/2")
9.52 (3/8")
15.88 (5/8")
9.52 (3/8")
19.05 (3/4")
12.70 (1/2")
22.22 (7/8")
Header (
*5)
3-6 Branches
3-8 Branches
UTR-H0906L
UTR-H0908L
UTR-H1806L
UTR-H1808L
36/
45/
54/
60/
72/
90/
96/
036
045
054
060
072
090
096
Remarks
-
k
H
I.U.
o
I.U.
O.U.: Outdoor unit
I.U.: Indoor unit
Pipe size (table A2)
Pipe size (table B2)
Pipe size (table C2)
Pipe size (table D2)
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