Height And Length Restrictions For Refrigerant Piping; Twin Type; Triple Type; Double-Twin Type - Mitsubishi Heavy Industries FDCA Series Technical Manual

Height and length restrictions for refrigerant piping

Twin type

Outdoor unit Indoor unit
ra
L
rb

Triple type

Outdoor unit Indoor unit
ra
L
rb
rc

Double-twin type

Outdoor unit Indoor unit
rd
rc
rb
ra
A
rA rA
r1
L
rB
rC
r2
In the illustration the L is main piping and ra,rb,rc, andrd are branch piping.
Request
(1) When the capacity of the indoor unit to be connected is 151, 201 and 251 or less, be sure to use a pipe diameter
of ø9.52 for the size of the liquid piping of branch piping (between branch and indoor units). (for double-twin
only) For connections to indoor units (liquid piping side dia. ø6.35) use the different diameter adapter coupling
that is included in the branch piping kit.
(2) Check to make sure the following pipe length limits are followed.
Refer to the above illustration.
(3) For the branch be sure to select the specified branch pipe set (sold separately) and then to follow the directions of
the instruction manual included in the branch pipe set when installing the piping. Be sure to install the branch
piping so that the branch is level.
FDCA301HEN, 301HES, 401HEN, 401HES, 501HES, 601HES
One-way pipe length (m) L +ra +rb
Branch pipe length (m)
Difference in height between indoor units (m) h=0.5 or less
FDCA801HES, 1001HES
A
One-way pipe length (m) L +ra
B
Branch pipe length (m)
Difference in height between indoor units (m) h=0.5 or less
FDCA601HES
One-way pipe length (m) L +ra +rb +rc
Branch pipe length (m)
A
Difference in height between indoor units (m) h1=0.5 or less, h2=0.5 or less, h3=0.5 or less
B
FDCA801HES, 1001HES
C
One-way pipe length (m) L +ra
Branch pipe length (m)
Difference in height between indoor units (m) h1=0.5 or less, h2=0.5 or less, h3=0.5 or less
FDCA601HES
One-way pipe length (m) L +ra +rb+rc +rd
Branch pipe length (m)
B
C
D
rD
Difference in height between indoor units (m)
FDCA801HES, 1001HES
One-way pipe length (m) L +ra
Branch pipe length (m)
Difference in height between indoor units (m) h1=0.5 or less, h2=0.5 or less
50
10, ra
Ira –rb I
70, L +rb
10, ra
Ira –rb I
10, Ira – rc I
Ira –rb I
ra 20, rb 20, rc
70, L +rb
10, Ira – rc I
Ira –rb I
ra 30, rb 30, rc
10, Ira – rc I
Ira –rb I
Ira –rdI 10, Irb – rd I
ra 20, rb 20, rc
rA +rB 15, rC +rD
70, L +rb
10, Ira – rc I
Ira –rb I
Ira –rdI 10, Irb – rd I
ra 30, rb 30, rc
rA +rB 15, rC +rD
21
- -
20, rb
20
70
30, rb
30
50
10, Irb – rc I
20
70, L +rc 70
10, Irb – rc I
30
50
10, Irb – rc I
10, Irc – rd I
20, rd
20
15
h1=0.5 or less, h2=0.5 or less
h3=0.5 or less, h4=0.5 or less
h5=0.5 or less, h6=0.5 or less
70, L +rc 70, L +rd
10, Irb – rc I
10, Irc – rd I
30, rd
30
15
h3=0.5 or less, h4=0.5 or less
h5=0.5 or less, h6=0.5 or less
10
10
10
10
70
10
10