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Piping construction conditions:
Project
Mark
Allowed Piping Length
(* 7)
≤ Number of
Recommended
Indoor Units
> Number Of
Recommended
Indoor Units
Total Piping Length
Total Length of
Liquid Pipe
≤ 1,000m
(*8)
≤ 300m
Maximum piping length
Actual length
L1
≤ 165m
≤ 165m
Equivalent length
≤ 190m
≤ 190m
The longest piping length between the first
branch to each indoor unit
L2
≤ 90m
≤ 40m
The longest piping length between the branch to
the connected indoor unit
L3
≤ 40m
≤ 30m
Piping length between the branch 1 to each
outdoor unit
La, Lb, Lc, Ld
≤ 10m
≤ 10m
The height difference
between the outdoor
units
Outdoor unit up
H1
≤ 50m
(*9)
≤ 50m
(*9)
Outdoor unit down
≤ 40m
≤ 40m
The height difference between the indoor units
H2
≤ 30m
≤ 30m
The height difference between the outdoor units
H5
≤ 0.1m
≤ 0.1m
(*1) The branch pipe 1 is a branch pipe near the outdoor unit side.
(*2) If piping length between single outdoor unit or branch pipe 1 and indoor unit is longer than
100m, the gas & liquid pipe of the main piping (from branch pipe 1 to the first branch pipe)
must be enlarged by one gauge.
(*3) When the size of the piping after the first branch pipe is larger than the diameter of the main
piping, enlarge the main pipe diameter to the size of the pipe after the first branch pipe. If pip
-
ing size after the branch pipe is larger than the piping size of the pipe before the branch pipe,
adjust it to the same size as the size of the piping after the branch pipe.
(*4)
The pipe diameter
④
is same as the piping diameter of indoor units.
(*5) When the length of the liquid pipe is longer than 15m, use Ø9.52 pipe and reducer.
(*6) Please keep the linear distance of 500mm or more from the branch pipe of outdoor unit.
(*7) The installation conditions of the refrigerant pipe are different depending on the number of
connected indoor units.
(*8) Limited by the maximum refrigerant charge volume, the permissible pipe total length may be
less than 1000m.
(*9) When the height difference between indoor and outdoor units is greater than 50m (8-54Hp: up
to 110m, 56-96Hp:up to 90m), contact your local dealer or distributor.
NOTE:
1. To ensure that the length of same section of the refrigerant pipe, gas pipe, and liquid pipe are same.
2. If the length of branch pipe to the indoor unit (
L3
) is significantly longer than the one to other indoor unit,
3.
the refrigerant flow will be impacted and performance deteriorates compared to other systems. Recommended length of
pipe is less than 15m.
4. For the combination of two or three modules, outdoor unit A should be connected after branch pipe 1. For the case of
4-module combination, connect the outdoor units A and B after the branch pipe 2, and then connect outdoor units C and D
to the branch pipe 3.
5.
Length of piping between outdoor units is : La ≤ Lb ≤ Lc ≤ Ld ≤ 10m.
