Allowable length/height difference of refrigerant pipinJ&DVHRI$OO2XWVLGH$LU
CAUTION
Length and height of refrigerant piping keep the limitation blow.
If installed in out of the limitation, there is a possibility that heat-exchanger in Outdoor unit will burst and leak a refrigerant gas, for freezing heat-exchanger by shortage
of defrosting capacity.
Allowable length and height difference of refrigerant piping
(*1): Farthest Indoor unit from the first branching section is the Indoor unit (c).
Please refer to “Outdoor Unit’s Installation Manual” except the above contents.
System restrictions Cautions for installation
Y-shaped branching joint must be installed
horizontally.
Max. No. of combined Outdoor units 1 unit
Max. capacity of combined Outdoor units 14 ton
Max. No. of combined Indoor units 3 units
Max. capacity of combined Indoor units Refer to “ The combination of Indoor units”
Allowable value Pipes
mtf
Pipe length Total extension of pipe (Liquid pipe) Actual length c+b+a+2L+1L003489
Farthest piping length
L(*1) Equivalent length 051294 L1 + c
Actual length 031724
Main piping length
Equivalent length Max. 394
0LQ
Max. 120
(Min. )L1
Actual length Max. 328
(Min. 164)
Max. 100
(Min. 50)
Farthest equivalent piping length from the first
branching section Li
(*1) Equivalent length c0389
Farthest equivalent piping length between
Outdoor units LO Equivalent length
Maximum equivalent piping length of Outdoor
unit connecting pipe Equivalent length
Maximum actual length of pipes connected to
Indoor units Actual length c,b,a0389
Maximum equivalent length between
branching sections Equivalent length 2L0389
Height difference
Height between Outdoor and Indoor units
H1
Upper Outdoor units 04131
Lower Outdoor units 301
Height between Indoor units H2 5.02
Height between Outdoor units H3
Indoor unit
Outdoor unit
Unit (A)
Unit (b)
Branching header
Branching pipe L2
Indoor unit connecting pipe
Indoor unit
Main
piping
L1
First branching
section
The longest piping length: L
492 ft (150 m)
The longest piping length from the first branch: Li 98 ft (30 m)
Height difference between
Outdoor and Indoor units:
H1 131 ft (40 m)
Indoor unit connecting pipe
Height difference
between Indoor units:
H2 2 ft (0.5 m)
Unit (a)
b
H2
c
a
H1
Unit (c)
Indoor unit
Max. 100
(Min. 50)
Max. 120
(Min. 50)
Max. 394
(Min. 164)
Max. 328
(Min. 164)
