Refrigerant Pipng Work - Mitsubishi Heavy Industries FDTVA402HEN1R 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) Single type
Outdoor unit
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.
(ii) Twin type
Models FDCVA402~602 [Branch pipe set : DIS-WA1]
Gas line
4
Outdoor unit
1
4
Liquid line
(Example)
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe
Model
FDCVA402 201 201
φ 9.52 t 0.8 φ 9.52 t 0.8
FDCVA502 251 251
FDCVA602 301 301
Notes (1) If you are using this model in combination with the 201, 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 FDCVA402 only.
Models FDCVA802, 1002 [Branch pipe set : DIS-WB1]
Gas line
1
Outdoor unit
3
Liquid line
(Example)
Item
Liquid pipe
Indoor unit
combinations Main pipe Branch pipe Main pipe Branch pipe
Model
φ 9.52 t 0.8
FDCVA802 401 401
φ 12.7 t 0.8
FDCVA1002 501 501
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.
Indoor unit
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
Piping specification
Outdoor unit model
FDCVA402, 502, 602
FDCVA802
FDCVA1002
Maximum one way length
FDCVA402~602 : L=50 m or less
FDCVA802, 1002 : L=70 m or less
Height difference
● When the position of outdoor unit is higher than that of
the indoor unit, keep the difference H=30 m or less.
● When the position of outdoor unit is lower than that of the
indoor unit, keep the difference H=15 m or less.
Chart of shapes of branch piping parts (DIS-WA1)
Gas pipe Mark
ID15.88
ID9.52
ID15.88
1
11
8
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.
(See the next page.)
Chart of shapes of branch piping parts (DIS-WB1)
Gas pipe Mark
ID15.88
ID9.52
ID25.4
1
19
10
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.
(See the next page.)
139
- -
Gas pipe Liquid pipe
ø 15.88 t1.0 ø 9.52
ø 25.4 t1.0 ø 9.52
ø 25.4 t1.0 ø 12.7
Liquid pipe Mark Reducer
ID9.52
ID9.52
8
2
ID9.52
210
OD15.88
Liquid pipe Mark Reducer
ID9.52
OD12.7
2
ID9.52
190
Unit : mm
t0.8
t0.8
t0.8
Mark
φ6.35
flared nut 3
50
105
2 piece
ID12.7
4
10
80
2 piece
Mark
ID9.52
3
10
80