Mitsubishi Electric FDT125VNVF Technical Manual page 293

2-6. Triple type for same model/different capacity or different model/different capacity
Applicable to the difference in length of pipes after the branch being less than 3 m
* Connection is not allowed when the difference in length of pipes is larger than 3 m.
Outdoor unit
Indoor unit
a
b
Connecting position
A B
Outdoor unit model Indoor unit model
2.5HP＋2.5HP＋5HP 5HP 2.5HP
10HP
3HP＋3HP＋4HP 4HP 3HP
Note When connect the indoor unit of an old model that is shown in the model list, use the joint supplied with the branch piping set like A.
2-7. W-twin type
Double Twin type
Pipes should be connected as follows for a W-twin installation (4 connected indoor units. The capacity of an outdoor unit available for this configuration
is either 8HP or 10HP only):
Outdoor unit capacity Indoor unit capacity
8HP
2HP×4 units
10HP
2.5HP×4 units
Indoor unit
Outdoor unit
b
a
b
Note When connect the indoor unit of an old model that is shown in the model list, use the joint supplied with the branch piping set like A.
3. Heat insulation work
(1) Condensation can also occur on liquid pipes with this model. Please provide good
heat insulation to both liquid and gas pipes.
(2) For the heat insulation of a branching pipe, always use the heat insulation material
supplied with the set and provide heat insulation according to the instructions set
out below.
1. It has an adhesive layer on the entire inner face.
Remove a separator and wrap it around the branching pipe.
Outdoor unit model Indoor unit model Branching pipe
A
B
10HP 2.5HP＋2.5HP＋5HP
C
C
2.5HP
3HP
10HP 3HP＋3HP＋4HP
Double Twin installation (4 connected indoor units. The capacity of an outdoor unit available for this configuration
Branching pipe
a DIS-WB1
b DIS-WA1
Branching pipe set type Liquid branching pipe
a DIS-WB1
ID12.7
Connecting pipe
(φ9.52)
b
DIS-WA1
ID9.52
①
CAUTION
Reference
①
a DIS-WB1
ID12.7
①
b DIS-WA1
ID9.52
Outdoor unit model Liquid branching pipe
8HP
ID9.52
Joint C
①
10HP
ID12.7
8HP
Connecting pipe
(φ9.52)
ID9.52
①
CAUTION
Reference
10HP
Heat insulation material
(for pipe insulation, etc.)
to be procured locally
2. Apply a heat insulation material (to be procured locally) to the joint between the
branching pipe's heat insulation and the heat insulation material covering
the installation's piping as described above and wrap a tape over the gap
shown as a hatched (///) area to complete dressing of the piping.
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'12 • PAC-T-174
Gas branching pipe
ID9.52
ID15.88
②
①
①
ID25.4
③
ID15.88
ID9.52
ID12.7
Flare joint (φ6.35)
Joint A
Joint B
②
①
②
ID15.88
③
③
Joint B
Joint A
Flare joint (φ6.35) ID12.7
ID9.52
ID15.88
②
①
ID25.4
③
ID9.52 ID15.88
ID9.52
ID15.88
②
①
ID15.88
③
ID15.88
ID9.52
Gas branching pipe
ID9.52
②
①
③
ID15.88
ID9.52
①
ID25.4
ID9.52
②
ID15.88
③
ID9.52
Joint B
①
ID15.88
Flare joint (φ6.35)
Joint A
Joint B
②
③
A
ID15.88
Joint A
②
Flare joint (φ6.35) ① ID15.88
ID15.88
③
ID15.88
Heat insulation material covering
the installation's piping
Branching pipe's heat insulation
②
③
A
ID15.88
②
①
ID15.88
③
ID15.88
②
③
②
③
②
③
ID12.7
②
③
ID12.7
ID12.7
Joint B
②
①
③
Joint B
ID12.7