Refrigerant Piping Work; Decision Of Piping Specification; Chart Of Shapes Of Branch Piping Parts (Dis-Wb1) - Mitsubishi Heavy Industries FDCA Series Technical Manual

(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]
Gas line
4
Outdoor unit
1
4
Liquid line
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe
Model
FDCA301 151 151
FDCA401 201 201
φ 9.52 t 0.8 φ 9.52 t 0.8
FDCA501 251 251
FDCA601 301 301
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]
Gas line
1
Outdoor unit
3
Liquid line
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe Branch pipe
Model
φ 9.52 t 0.8
FDCA801 401 401
φ 12.7 t 0.8
FDCA1001 501 501
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.
The branch piping (both gas and liquid lines) should always be arranged to have a level or perpendicular
branch.
< 2-Way Branch >
Mount
< 3-Way Branch >
Indoor unit
3
2
3
Gas pipe
Branch pipe
φ 12.7 t 0.8
φ 15.88 t 1.0
φ 15.88 t 1.0
Indoor unit
2
Gas pipe
φ 9.52 t 0.8 φ 25.4 t 1.0 φ 15.88 t 1.0
sections level with the floor.
Chart of shapes of branch piping parts (DIS-WA1)
Gas pipe Mark
ID15.88
ID15.88
1
11
24
ID15.88
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.)

Chart of shapes of branch piping parts (DIS-WB1)

Gas pipe Mark
ID15.88
ID25.4
1
19
39
ID15.88
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.)
Floor
Floor
Mount
perpendicular to the floor.
Floor
Floor
108
- -
Liquid pipe Mark
ID9.52
ID9.52
ID9.52
2
8
ID9.52
210 OD15.88
Liquid pipe Mark
ID9.52
ID9.52
OD12.7
2
10
ID9.52
190
sections
Reducer Mark
φ6.35
flared nut
3
50
8
105
2 piece
ID12.7
4
10
80
2 piece
Reducer Mark
ID9.52
3
10
80
Floor
Floor