Mitsubishi Heavy Industries FDCA Series, Technical Manual, Page: 110 / 163

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108
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(2) Refrigerant piping work
Select the piping specification to fit the specification of Indoor unit and installation location.
(a) Decision of piping specification
(i) Twin type
Models FDCA301~601 [Branch pipe set : DIS-WA1]
Outdoor unit
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe
φ
9.52 t 0.8
φ
9.52 t 0.8
φ
12.7 t 0.8
φ
15.88 t 1.0
φ
15.88 t 1.0
Branch pipe
Gas pipe
Model
FDCA301
FDCA401
FDCA501
FDCA601
151 151
201 201
251 251
301 301
Indoor unit
Liquid line
Gas line
1
2
Chart of shapes of branch piping parts (DIS-WA1)
Gas pipe Liquid pipe Reducer Mark Mark Mark
24
210
8
105
50
8
11
ID15.88
ID15.88
ID15.88
ID9.52
ID9.52
ID9.52
ID9.52
OD15.88
2 piece
2 piece
ID12.7
φ
6.35
flared nut
11
48
180
8
80
10
1 2
3
4
3
3
4
4
Notes (1)
1
to
4
in the drawing include parts provided in the branch piping set. It shows
the codes for the shapes of different-diameter connections.
(2) Branch piping should always be arranged to have level or perpendicular branch.
(Refer to the drawing below for details.)
Notes (1) If you are using this model in combination with the 151 ~ 251 Series indoor units, use the irregular fittings
3
supplied with the branch piping set and make the branch piping (branch ~ indoor unit) liquid piping size
φ
9.52.
(2) Mark is 4 to FDC301, 401 only.
Models FDCA801, 1001 [Branch pipe set : DIS-WB1]
Outdoor unit
φ
9.52 t 0.8
φ
12.7 t 0.8
φ
9.52 t 0.8
φ
25.4 t 1.0
φ
15.88 t 1.0
Indoor unit
Liquid line
Gas line
1
2
Chart of shapes of branch piping parts (DIS-WB1)
3
Gas pipe Liquid pipe Reducer Mark Mark Mark
39 190
10
19
ID25.4
ID15.88
ID15.88
ID9.52
ID9.52
ID9.52
OD12.7 ID9.52
12
80
184
8
80
10
1 2
3
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe Branch pipe
Gas pipe
Model
FDCA801
FDCA1001
401 401
501 501
Notes (1)
1
to
3
in the drawing include parts provided in the branch piping set. It shows
the codes for the shapes of different-diameter connections.
(2) Branch piping should always be arranged to have level or perpendicular branch.
(Refer to the drawing below for details.)
Notes (1) In the case of the FDCA801, if the length of the main pipe exceeds 40 m, make
the liquid piping size
φ
12.7.
< 2-Way Branch >
< 3-Way Branch >
Floor Floor
Floor
Floor
Floor
Floor
Mount sections level with the floor.
Mount sections
perpendicular to the floor.
The branch piping (both gas and liquid lines) should always be arranged to have a level or perpendicular
branch.