En-8
• Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
164 ft (50 m) or less
H1
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
131 ft (40 m) or less
Between indoor units 49 ft (15 m) or less H2, H3
Between outdoor units 1 ft (0.5 m) or less H4
Between RB unit and indoor unit 16 ft (5 m) or less H5
Between RB units 49 ft (15 m) or less H6
• Total refrigerant amount : 231.49 lbs (105.0 kg) or less
• Outdoor unit capacity : Master ≥ Slave 1 ≥ Slave 2
NOTE:
• If the outdoor temperature during cooling operation is expected to be 23 °F
(–5 °C) or less, outdoor unit must be installed lower than 16 ft (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 refrig-
erant.
4. 2. Pipe selection
CAUTION
This unit is designed specifi cally 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.
Master
unit
Slave
unit1
Outdoor unit branch kit (Optional)
Separation tube (Optional)
RB (multi type)RB
RB
(single
type)
Pipe size
(table D)
Pipe size (table A)
Pipe size (table B)
Pipe size (table C)
Pipe size (table E)
Pipe size (table F)
Slave
unit2
(Wall thickness and pipe material for each diameter)
Outside diameter
[in (mm)]
Wall thickness
[in (mm)] *1
Material
1/4 (6.35) 0.032 (0.8)
COPPER *2
JIS H3300 C1220T-O
or equivalent
3/8 (9.52) 0.032 (0.8)
1/2 (12.70) 0.032 (0.8)
5/8 (15.88) 0.039 (1.0)
3/4 (19.05) 0.047 (1.2)
7/8 (22.22) 0.039 (1.0)
COPPER *3
JIS H3300 C1220T-H
or equivalent
1-1/8 (28.58) 0.039 (1.0)
1-3/8 (34.92) 0.047 (1.2)
1-5/8 (41.27) 0.056 (1.43)
*1. Endurance pressure of the pipes 609 psi (4.2 MPa)
*2. Allowable tensile stress ≥ 33 N/mm²
*3. Allowable tensile stress ≥ 61 N/mm²
Please select the pipe size in accordance with local rules.
Table. A (Between outdoor unit and outdoor unit branch kit)
Ton
Outdoor unit
cooling ca-
pacity [Btu/h]
Outside diameter mm [in (mm)]
Branch kit
*4
Liquid pipe
Discharge
Gas pipe
Suction Gas
pipe
6
72,000 1/2 (12.70) 5/8 (15.88) 7/8 (22.22)
UTP-DX567A
8
96,000 1/2 (12.70) 3/4 (19.05) 7/8 (22.22)
10
120,000 1/2 (12.70) 3/4 (19.05) 1-1/8 (28.58)
*4. For the installation method, refer to “5.4. Multiple connections”.
Table. B (Between outdoor unit branch kits or outdoor unit branch kit and
fi rst separation tube)
Total cooling
capacity of outdoor
unit [Btu/h (Ton)]
Outside diameter [in (mm)]
Liquid pipe
Discharge Gas
pipe
Suction Gas pipe
72,000 (6) 1/2 (12.70) 5/8 (15.88) 7/8 (22.22)
96,000 (8) 1/2 (12.70) 3/4 (19.05) 7/8 (22.22)
120,000 (10) 1/2 (12.70) 3/4 (19.05) 1-1/8 (28.58)
144,000 (12) 1/2 (12.70) 7/8 (22.22) 1-1/8 (28.58)
168,000 (14)
192,000 (16)
5/8 (15.88) 7/8 (22.22) 1-1/8 (28.58)
216,000 (18)
240,000 (20)
264,000 (22)
5/8 (15.88) 1-1/8 (28.58) 1-3/8 (34.92)
288,000 (24) 3/4 (19.05) 1-1/8 (28.58) 1-3/8 (34.92)
Table. C (Between separation tubes or separation tube and RB unit)
Total cooling
capacity of indoor
unit [Btu/h]
Outside diameter [in (mm)]
Separation
tube
Liquid pipe
Discharge Gas
pipe
Suction Gas
pipe
for 3 pipes
15,000 ≤ x < 36,000 3/8 (9.52) 1/2 (12.70) 5/8 (15.88)
UTP-
BX090A
36,000 ≤ x < 48,000 3/8 (9.52) 1/2 (12.70) 3/4 (19.05)
48,000 ≤ x < 72,000 1/2 (12.70) 5/8 (15.88) 7/8 (22.22)
72,000 ≤ x < 96,500 1/2 (12.70) 3/4 (19.05) 7/8 (22.22)
96,500
≤
x
<
153,000
1/2 (12.70) 3/4 (19.05) 1-1/8 (28.58)
UTP-
BX180A
153,000 ≤ x < 161,000
5/8 (15.88) 3/4 (19.05) 1-1/8 (28.58)
161,000 ≤ x < 193,000
5/8 (15.88) 7/8 (22.22) 1-1/8 (28.58)
193,000
≤
x
<
274,000
5/8 (15.88) 1-1/8 (28.58) 1-3/8 (34.92)
UTP-
BX567A
274,000
≤
x
<
325,000
3/4 (19.05) 1-1/8 (28.58) 1-3/8 (34.92)
325,000 ≤ x 3/4 (19.05) 1-1/8 (28.58) 1-5/8 (41.27)
* If the selected pipe diameter between separation tubes (based on table "C") becomes
larger than the pipe diameter between outdoor unit branch kit and the fi rst separation
tube (based on table "B"), please select the pipe whose diameter is equal to the one
between outdoor unit branch kit and the fi rst separation tube.
(If pipe diameter C > B, select pipe size from table B)
* Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
* Discharge gas pipe size selection : When indoor unit of cooling only type is connected,
it calculates with the value except capacity of cooling only type.
Table. D (Between separation tube and RB unit
)
Indoor unit
capacity
[Btu/h]
Outside diameter [in (mm)]
Liquid pipe
Discharge Gas
pipe
Suction Gas pipe
7,500 9,500
12,000 14,000
1/4 (6.35) 3/8 (9.52) 1/2 (12.70)
18,000 24000
30,000
3/8 (9.52) 1/2 (12.70) 5/8 (15.88)
36,000 48,000 3/8 (9.52) 1/2 (12.70) 3/4 (19.05)
60,000 3/8 (9.52) 5/8 (15.88) 3/4 (19.05)
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
Table. E (Between separation tubes or RB unit and separation tube)
Total cooling capacity
of indoor unit [Btu/h]
Outside diameter [in (mm)] Separation tube
Liquid pipe Gas pipe for 2 pipes
15,000 ≤ x < 36,000 3/8 (9.52) 5/8 (15.88)
UTP-AX054A,
UTP-AX090A or
UTR-BP090X
36,000 ≤ x < 48,000 3/8 (9.52) 3/4 (19.05)
48,000 ≤ x < 66,000 1/2 (12.70) 7/8 (22.22)
66,000 ≤ x < 96,500 1/2 (12.70) 7/8 (22.22)
UTP-AX090A or
UTR-BP090X
96,500 ≤ x < 153,000 1/2 (12.70) 1-1/8 (28.58)
UTP-AX180A or
UTR-BP180X
153,000 ≤ x < 193,000 5/8 (15.88) 1-1/8 (28.58)
193,000 ≤ x < 274,000 5/8 (15.88) 1-3/8 (34.92)
UTP-AX567A or
UTR-BP567X
274,000 ≤ x < 325,000 3/4 (19.05) 1-3/8 (34.92)
325,000 ≤ x 3/4 (19.05) 1-5/8 (41.27)
* If the selected pipe diameter based on table "E" becomes larger than the pipe diameter
based on table "C", please select the pipe whose diameter is equal to the table "C".
Gas pipe of table "E" should be compared with suction gas pipe of table "C."
(If pipe diameter E > C, select pipe size from table C)
* "Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
9378945159-04_IM.indb 89378945159-04_IM.indb 8 2015/12/1 10:50:542015/12/1 10:50:54
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