Pipe working conditions
Part Make
Permitted pipe length
(13)
≤ Recommended number
of connected indoor units
≥ Recommended number
of connected indoor units
Total pipe length
Current total liquid pipe
length
≤ 1000 m
(14)
≤ 300 m
Maximum pipe length
Current length
L1
≤ 165 m ≤ 165 m
Equivalent length
≤ 190 m ≤ 190 m
Maximum pipe length between the multikit of
the first branch
and each indoor unit
L2
≤ 90 m ≤ 40 m
Maximum pipe length between each multikit and each
indoor unit
L3
≤ 40 m ≤ 30 m
Total pipe length between the CH unit and each indoor unit
*
L4
*
a+b+c+d+e
CH-6.0N1: ≤ 30 m CH-6.0N1: ≤ 30 m
CH-10.0N1: ≤ 10 m CH-10.0N1: ≤ 10 m
Pipe length between connection kit 1 and each outdoor unit L5
≤ 10 m ≤ 10 m
Difference in height between
outdoor and indoor units
Highest outdoor unit
H1
≤ 50 m ≤ 50 m
Lowest outdoor unit
≤ 40 m ≤ 40 m
Difference in height between indoor units H2
≤ 15 m ≤ 15 m
Difference in height between indoor units using the same
CH unit
H3
≤ 4 m ≤ 4 m
Difference in height between CH units H4
≤ 15 m ≤ 15 m
Difference in height between outdoor units H5
≤ 0.1 m ≤ 0.1 m
N O T E
•
(1)
The connection kit is taken into account from the side of the indoor unit (as connection kit 1).
•
(2)
When
the maximum equivalent refrigerant pipe length (L1) from the outdoor unit/connection kit 1 to the
indoor unit is greater than 100 m, the diameter of the liquid pipe from the outdoor unit/connection kit 1 to the
first branch must be increased using the reducer (field-supplied).
•
(3)
Where the refrigerant pipe length is greater than 100 m, the pipe diameter does not have to be increased after
the first branch. Where the size of the multikit is greater than that of the first branch, adjust the size of the
multikit to the first branch. Where the diameter of the pipe selected after the first branch is greater than the
diameter of the pipe after it, use the same diameter as the inlet pipe.
•
(4)
The pipe diameter -6- must be the same as that of the indoor unit connection.
•
(5)
Where the liquid pipe length is greater than 15 m, use 9.53 mm diameter pipe and a reducer (field-supplied).
•
(6)
Keep a direct distance of 500 mm or greater after the connection kit.
•
(7)
In the case of branches, where the pipe length between the three-pipe branch -F- and the furthest indoor unit
exceeds 5 m, use a T-branch pipe for the three-branch liquid pipe (corresponding to the same diameter, as per
JIS B8607).
•
(8)
Where the number of connectable indoor units is greater
than four, the high/low-pressure gas, gas and liquid pipes,
-4-, -5- and -6-, must be increased by one measurement,
respectively.
•
(9)
The liquid pipe does not have to be connected to the CH
unit. See Table 6 for the pipe diameter between the
multikit and the indoor unit.
•
(10)
Where the combination of indoor unit capacities is
10 HP for the CH-10.0N1 unit, performance will drop by
approximately 5% in refrigeration and 10% in heating.
•
(11)
The excess total capacity may lead to insufficient performance and abnormal operating noise. Check that
the installation is within the total capacity values.
3 Piping work and
refrigerant charge
56
SMGB0065 rev. 1 - 12/2010
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