Mitsubishi Heavy Industries FDTCVA SERIES Technical Manual page 218

•
The branch piping (both gas and liquid lines) should always be arranged to have a level or perpendicular
branch.
< 2-Way Branch >
< 3-Way Branch >
(iii) Triple type
Model FDCVA602 [Branch pipe set : DIS-TA1]
Gas line
Outdoor unit
Liquid line
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe Branch pipe
Model
φ 9.52 × t 0.8 φ 9.52 × t 0.8 φ 15.88 × t 1.0 φ 12.7 × t 0.8
FDCVA602 20 + 20 + 20
Notes (1) Use the irregular fi ttings 3 supplied with the branch piping set on the indoor unit side, and make the branch piping
(branch ~ indoor unit) liquid piping size φ9.52.
Model FDCVA802 [Branch pipe set : DIS-TB1]
Gas line
Outdoor unit
Liquid line
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe Branch pipe
Model
φ 9.52 × t 0.8 φ 9.52 × t 0.8
FDCVA802 30 + 30 + 30
Notes (1) For model FDCVA802, always use ø12.7 mm liquid pipes, when the length of the main "L" exceeds 40 m. If ø9.52 mm pipes are used in an installation having over
40 m piping, they can cause performance degradation and/or water leaks from an indoor unit.
When the pipe length measures 60 m or longer for the model FDCVA802, we recommend the use of a ø12.7 mm liquid main.
(2) One-way pipe length should measure 5 m at a minimum. If the pipe length measures less than 5 m, then reduce the quantity of charged refrigerant. If you need to
recover or recharge refrigerant, contact our sales agent found in your neighborhood.
Mount sections level with the floor.
Indoor unit
Gas pipe
Indoor unit
Gas pipe
φ 25.4 × t 1.0 φ 15.88 × t 0.8
Floor
Floor
Mount
perpendicular to the floor.
Floor
Floor
Chart of shapes of branch piping parts
Gas pipe Mark
100 80 80
ID12.7×3
ID15.88
10
300
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.
(See the above fi gure.)
Chart of shapes of branch piping parts
Gas pipe Mark
100 80 80
ID15.88×3
ID25.4
10
300
Reducer Mark
OD15.88 ID12.7
-
10
80
Notes (1) 1 to 2 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.
(See the above fi gure.)
217
- -
sections
(DIS-TA1)
Liquid pipe Mark
ID9.52×3
ID9.52
ID9.52
8
8
8
237
(DIS-TB1)
Liquid pipe Mark
ID9.52×3
ID9.52
ID9.52
8
8 8
8
217
Reducer Mark
OD12.7 ID9.52
-
10
80
Floor
Floor
Reducer Mark
φ6.35
Flared nut
50
105
Reducer Mark
φ6.35
-
Flared nut
50
105