En-12
Cooling capacity of indoor unit
[Btu/h]
Outside diameter mm (in)
Liquid pipe Gas pipe
4,000 / 7,500 / 9,500
1/4 (6.35) 1/2 (12.70)
12,000 / 14,000
18,000 3/8 (9.52)
5/8 (15.88)
24,000 / 30,000 / 34,000
3/8 (9.52)
36,000
3/4 (19.05)48,000
60,000
72,000
1/2 (12.70) 7/8 (22.22)
96,000
Separation tube / Header
* For the installation method of separation tube and header, refer to “6.2. Indoor unit pipe
connections”.
• Separation tube
Total cooling capacity of
indoor unit [Btu/h]
Separation tube
For 2 pipes For 3 pipes
x < 66,000 UTP-AX054A
UTP-BX090A
x < 96,500 UTP-AX090A
96,500 ≤ x < 193,000 UTP-AX180A UTP-BX180A
193,000 ≤ x UTP-AX567A UTP-BX567A
• Header
Total cooling capacity
of indoor unit [Btu/h]
Header
For 2 pipes For 3 pipes
3-6 Branches 3-8 Branches 3-6 Branches 3-8 Branches
x < 96,500 UTR-H0906L UTR-H0908L UTP-J0906A UTP-J0908A
96,500 ≤ x < 193,000 UTR-H1806L UTR-H1808L UTP-J1806A UTP-J1808A
Outdoor air unit
Connectable unit within 1 refrigerant system
Unit
Connectable cooling
capacity range
Remarks
Only Outdoor air unit 50% to 100% —
Outdoor air unit
+ Indoor unit
50% to 100%
The capacity of "Outdoor air
unit" should be less than 30%
of the outdoor unit capacity.
5.3. Protection of pipes
• Protect the pipes to prevent the entry of moisture and dust.
• Especially pay attention when passing the pipes through a hole or connecting the end of
a pipe to the outdoor unit.
Location Working period Protection method
Outdoor
1 month or more Pinch pipes
Less than 1 month Pinch or tape pipes
Indoor — Pinch or tape pipes
6. PIPE INSTALLATION
6.1. Brazing
CAUTION
If air or another type of refrigerant enters the refrigera-
tion cycle, the internal pressure in the refrigeration
cycle will become abnormally high and prevent the
unit from exerting its full performance.
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
Apply nitrogen gas while brazing the pipes.
Nitrogen gas pressure: 2.9 psi (0.02 MPa) (= pressure
felt sufficiently on the back of your hand)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation film.
This can degrade performance or damage the parts in the unit (such as the compressor
or valves).
Do not use flux to braze pipes. If the flux is the chlorine type, it will cause the pipes to
corrode.
In addition, if the flux contains fluoride, it will affect the refrigerant piping system due to
deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require flux.
Table. D (Between separation tube and RB unit
)
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
[Standard]
Cooling capacity of indoor unit
[Btu/h]
Outside diameter mm (in)
Liquid pipe
Discharge
gas pipe
Suction gas
pipe
4,000 / 7,500 / 9,500
1/4 (6.35)
3/8 (9.52) 1/2 (12.70)
12,000 / 14,000
18,000
1/2 (12.70)
5/8 (15.88)
24,000 / 30,000 / 34,000
3/8 (9.52)
36,000
3/4 (19.05)48,000
60,000 5/8 (15.88)
72,000
3/4 (19.05) 7/8 (22.22)
96,000
[Condition 1]
When one or more of the following apply:
• The distance between the outdoor unit (primary) and the farthest indoor unit is 394 ft
(120 m) or more.
• The distance between the first branch and the farthest indoor unit is 60 m or more.
• Pipe length of indoor unit (4,000 to 9,500 Btu/h, 48,000 to 60,000 Btu/h, 96,000 Btu/h)
and branch is 66 ft (20 m) or more.
• If the outdoor unit is lower than the indoor unit and the height difference exceeds 16 ft (5
m); only for liquid pipes.
Cooling capacity of indoor unit
[Btu/h]
Outside diameter mm (in)
Liquid pipe
Discharge
gas pipe
Suction gas
pipe
4,000 / 7,500 / 9,500
1/4 (6.35) 3/8 (9.52) 1/2 (12.70)
12,000 / 14,000
18,000 3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
24,000 / 30,000 / 34,000
3/8 (9.52)
36,000
3/4 (19.05)48,000
60,000 5/8 (15.88)
72,000
1/2 (12.70) 3/4 (19.05) 7/8 (22.22)
96,000
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 (for 2 pipes)
Liquid pipe Gas pipe
8,000 ≤ x < 36,000
3/8 (9.52)
5/8 (15.88)
UTP-AX054A or
UTP-AX090A
36,000 ≤ x < 48,000 3/4 (19.05)
48,000 ≤ x < 72,000
1/2 (12.70)
7/8 (22.22)
72,000 ≤ x < 96,500 UTP-AX090A
96,500 ≤ x < 153,000
1-1/8 (28.58) UTP-AX180A153,000 ≤ x < 161,000
5/8 (15.88)161,000 ≤ x < 193,000
193,000 ≤ x < 274,000
1-3/8 (34.92)
UTP-AX567A274,000 ≤ x < 325,000
3/4 (19.05)
325,000 ≤ x 1-5/8 (41.27)
Table. F (Between separation tube and indoor unit or RB unit and indoor unit
)
Cooling capacity of indoor unit
[Btu/h]
Outside diameter mm (in)
Liquid pipe Gas pipe
4,000 / 7,500 / 9,500
1/4 (6.35)
3/8 (9.52)
12,000 / 14,000
1/2 (12.70)
18,000
24,000 / 30,000 / 34,000
3/8 (9.52)
5/8 (15.88)
36,000
48,000
60,000
72,000 3/4 (19.05)
96,000 7/8 (22.22)
[Condition 1]
When one or more of the following apply:
• The distance between the outdoor unit (primary) and the farthest indoor unit is 394 ft
(120 m) or more.
• The distance between the first branch and the farthest indoor unit is 60 m or more.
• Pipe length of indoor unit (4,000 to 9,500 Btu/h, 48,000 to 60,000 Btu/h, 96,000 Btu/h)
and branch is 66 ft (20 m) or more.
• If the outdoor unit is lower than the indoor unit and the height difference exceeds 16 ft (5
m); only for liquid pipes.
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