689
V MULTI
Height and length restrictions for refrigerant piping
(Twin type) (Triple type)
Indoor unit
Indoor unit
Outdoor unit Indoor unitOutdoor unit
A
L
ra
rb
B
Indoor unitOutdoor unit
A
L
ra
rb
B
A
L
ra
rb
rc
B
C
A
L
ra
rArA
rb
rc
rd
rB
rC
rD
r2
r1
B
C
D
Outdoor unit
(Double-twin type)
Models FDC508HES3
Models FDC808, 1008HES3
In the illustration the L is main piping and ra, andrb are branch piping.
In the illustration the L is main piping and ra,rb,rc, andrd are branch piping.
(1) When the capacity of the indoor unit to be connected is 208 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 twin, triple, and 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) 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.
• One-way pipe length (m) L + ra 50, L+rb 50, L+rc 50, L+rd 50
• Branch pipe length (m) lra – rbl 10, lra – rcl 10, lrb – rcl 10
lra – rdl 10, lrb – rdl 10, lrc – rdl 10
ra 30, rb 30, rc 30, rd 30
rA +rB 15, rC +rD 15
• Vertical height difference between outdoor unit and indoor unit
Outdoor unit is higher Max. 30m
Outdoor unit is lower Max. 15m
• Difference in higher between indoor units Max. 4m
Request
(1) 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.
Request
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• One-way pipe length (m) L +ra +rb 50
• Branch pipe length (m) lra – rbl 10, ra 30, rb 30
• Vertical height difference between outdoor unit and indoor unit
Outdoor unit is higher Max. 30m
Outdoor unit is lower Max. 15m
• Difference in higher between indoor units Max. 1m
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