5
4. Installing the refrigerant piping
4.3. Indoor unit (Fig. 4-3)
Installing procedures
1. Slide the supplied pipe cover
over the gas tubing until it is pressed against the
sheet metal inside the unit.
2. Slide the provided pipe cover
over the liquid tubing until it is pressed against
the sheet metal inside the unit.
3. Tighten the pipe covers
and
at the both ends (20 mm) with the supplied
bands
.
Gas tubing
Pipe cover
Liquid tubing
Press the pipe cover against the sheet metal.
Band
Refrigerant tubing heat insulating material
Pipe cover
4.4. For twin/triple combination
Refer to the outdoor unit installation manual.
4.1. Precautions
)RUGHYLFHVWKDWXVH5$UHIULJHUDQW
• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-
WLRQRLODSSOLHGWRWKHÀDUHGVHFWLRQV
8VH & FRSSHU SKRVSKRUXV IRU FRSSHU DQG FRSSHU DOOR\ VHDPOHVV
pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thick-
QHVVHVVSHFL¿HGLQWKHWDEOHEHORZ0DNHVXUHWKHLQVLGHVRIWKHSLSHVDUH
clean and do not contain any harmful contaminants such as sulfuric com-
SRXQGVR[LGDQWVGHEULVRUGXVW
Warning:
:KHQLQVWDOOLQJRUPRYLQJWKHDLUFRQGLWLRQHUXVHRQO\WKHVSHFL¿HGUHIULJHU
-
DQW5$WRFKDUJHWKHUHIULJHUDQWOLQHV'RQRWPL[LWZLWKDQ\RWKHUUHIULJ
-
erant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
RP35, 50
RP60-140
Liquid pipe
:
6.35 thickness 0.8 mm
:
9.52 thickness 0.8 mm
Gas pipe
:
12.7 thickness 0.8 mm
:
15.88 thickness 1.0 mm
'RQRWXVHSLSHVWKLQQHUWKDQWKRVHVSHFL¿HGDERYH
4.2. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or
more, thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
VXODWLRQPDWHULDOVVSHFL¿FJUDYLW\RIWKLFNQHVVRIPPRUPRUH
$SSO\WKLQOD\HURIUHIULJHUDQWRLOWRSLSHDQGMRLQWVHDWLQJVXUIDFHEHIRUHWLJKWHQ
-
LQJÀDUHQXW
• Use 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
Flare nut tightening torque
Copper pipe O.D.
(mm)
Flare nut O.D.
(mm)
Tightening torque
(N·m)
:
6.35
17
14-18
:
6.35
22
34-42
:
9.52
22
34-42
:
12.7
26
49-61
:
12.7
29
68-82
:
15.88
29
68-82
:
15.88
36
100-120
:
19.05
36
100-120
$SSO\UHIULJHUDWLQJPDFKLQHRLORYHUWKHHQWLUHÀDUHVHDWVXUIDFH
8VHFRUUHFWÀDUHQXWVPHHWLQJWKHSLSHVL]HRIWKHRXWGRRUXQLW
Available pipe size
RP35, 50
RP60
RP71-140
Liquid side
:
ȅ
:
6.35
—
—
:
ȅ
:
ȅ
Gas side
:
ȅ
:
ȅ
:
ȅ
ȅ)DFWRU\ÀDUHQXWDWWDFKPHQWWRWKHKHDWH[FKDQJHU
Flare cutting dimensions
Copper pipe O.D.
Flare dimensions
(mm)
:
A dimensions (mm)
:
6.35
8.7 - 9.1
:
9.52
12.8 - 13.2
:
12.7
16.2 - 16.6
:
15.88
19.3 - 19.7
:
19.05
23.6 - 24.0
90
0.5
A
R0.4~R0.8
45
2
Fig. 4-1
Die
Copper pipe
B
Fig. 4-2
Copper pipe O.D.
B (mm)
(mm)
Flare tool for R410A
Clutch type
:
6.35 (1/4")
0 - 0.5
:
9.52 (3/8")
0 - 0.5
:
12.7 (1/2")
0 - 0.5
:
15.88 (5/8")
0 - 0.5
:
19.05 (3/4")
0 - 0.5
Fig. 4-3
