Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 374

2. Pipe connecting procedure
Braze the different diameter pipe joint found in the set matching the connected outdoor and indoor unit capacities according to the instructions set out below.
In connecting an indoor unit of which capacity is 1.5HP, 2HP or 2.5HP always use a
CAUTION
pipe (branching pipe - indoor unit).
In connecting to an indoor unit (liquid pipe side:
procedure set out below.
2-1 DIS-WA1
Supported combinations
Liquid branching pipe
Outdoor unit model Indoor unit model
3HP
1.5HP 1.5HP
2HP 2HP
Connecting pipe
4HP
( 9.52)
ID9.52
1.5HP 2.5HP
2.5HP 2.5HP
5HP
Connecting pipe
2HP 3HP
( 9.52)
ID9.52
ID9.52
3HP 3HP
6HP
Connecting pipe
2HP 4HP
( 9.52)
ID9.52
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
Brazing
Liquid connecting pipe ( 9.52)
Gas branching pipe
ID12.7
Joint B
ID15.88
Joint B
Flare joint
ID12.7
( 6.35)
Joint A
A
ID12.7
Joint B
Joint B
ID15.88
ID15.88
CAUTION
Joint B
Reference
ID12.7
Joint A
A
Flare joint
ID12.7
( 6.35)
Joint B
ID15.88
ID15.88
Joint B
ID12.7
Flare joint
( 6.35)
ID12.7
Joint A
Joint B
ID15.88
CAUTION
ID15.88
Reference
ID9.52
ID9.52 ID15.88
ID15.88
ID9.52
ID15.88
Flare joint
( 6.35)
ID12.7
Joint A
Joint B
ID15.88
CAUTION
ID15.88
ID9.52 Reference
6.35), use the different diameter pipe joint A supplied with the set and follow the
Flarenut 6.35
Joint A To indoor unit liquid pipe connection port
2-2 DIS-WB1
Supported combinations
Outdoor unit model Indoor unit model
3HP 5HP
8HP
4HP 4HP
5HP 5HP
10HP
ID12.7
Applicable to the difference in length of pipes after the branch being less than 3 m
2-3 DIS-TA1
Connection is not allowed when the difference in length of pipes is larger than 3 m.
ID15.88
Supported combinations
Outdoor unit model Indoor unit model
ID15.88
6HP 2HP 2HP 2HP
ID15.88
Applicable to the difference in length of pipes after the branch being less than 3 m
2-4 DIS-TB1
Connection is not allowed when the difference in length of pipes is larger than 3 m.
Supported combinations
Outdoor unit model Indoor unit model
8HP 3HP 3HP 3HP
OLD Model list
model name
FDTA251R
FDENA251R
FDKNA251R
FDURA251R
FDUMA252R
349
- -
9.52 liquid pipe to connect to the branching
Liquid branching pipe Gas branching pipe
ID9.52
ID9.52
ID25.4
Joint C ID9.52
ID9.52
ID12.7
ID25.4
ID9.52
Liquid branching pipe Gas branching pipe
Connecting pipe
Joint A
( 9.52)
Flare
ID9.52 joint
( 6.35)
ID15.88
Joint A
Reference
CAUTION
Liquid branching pipe Gas branching pipe
ID9.52
ID9.52
ID25.4
ID15.88
ID15.88
ID15.88
ID15.88
ID12.7
ID15.88