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Piping work and refrigerant charge
For heat recovery systems (3 pipes)
Total pipe length
Maximum pipe length
Maximum pipe length between the multikit of the first branch
and each indoor unit
Maximum pipe length between each multikit and each indoor
unit
Total pipe length between the CH unit and each indoor unit
Pipe length between connection kit 1 and each outdoor unit
Difference in height between
outdoor and indoor units
Difference in height between indoor units
Difference in height between indoor units using the same CH
unit
Difference in height between CH units
Difference in height between outdoor units
N O T E
For heat pump systems (2 pipes)
•
The connection kit is taken into account from the side of the
(1)
indoor unit (as connection kit 1).
•
When the maximum equivalent refrigerant pipe length (L1)
(2)
from the outdoor unit/connection kit 1 to the indoor unit is
greater than 100 m, the diameter of the gas/liquid pipe from
the outdoor unit/connection kit 1 to the first branch must be
increased using the reducer (field-supplied).
•
Where the refrigerant pipe length is greater than 100 m,
(3)
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.
•
The pipe diameter -4- must be the same as that of the indoor
(4)
unit connection.
•
Where the liquid pipe length is greater than 15 m, use
(5)
9.53 mm diameter pipe and a reducer (field-supplied).
•
Keep a direct distance of 500 mm or greater after the con-
(6)
nection kit.
•
The installation conditions for the refrigerant pipes are differ-
(7)
ent depending on the number of indoor units connected.
•
The total pipe length permitted must be less than 1000 m
(8)
due to the maximum additional refrigerant charge limitation.
HP
Maximum additional
refrigerant charge (kg)
•
Longer piping up to 90 m is available only for base units of
(9)
FSXNH(E) / FSXN1E series. (Dip switch setting required). In
the case of base units of FSXN1E series: only for the maxi-
mum number of connectable indoor units: (RAS-8FSXN1E ≤
14), (RAS-10FSXN1E ≤ 18), (RAS-12FSXN1E ≤ 21), (RAS-
14FSXN1E ≤ 26), (RAS-16FSXN1E ≤ 29).
47
PMML0294A_rev.2_02-2014.indb 47
Part
Current length
Equivalent length
Highest outdoor unit
Lowest outdoor unit
5 - 10
12
14 and 16 18 - 24 26 - 54
28
36
40
51
PMML0294A rev.2 - 07/2014
Make
≤ Recommended number
of connected indoor units
Current total liquid
≤ 1000 m
pipe length
≤ 165 m
L1
≤ 190 m
L2
≤ 90 m
L3
≤ 40 m
CH-6.0N(1/2): ≤ 30 m
L4
*
a+b+c+d+e
*
CH-10.0N(1/2): ≤ 10 m
L5
≤ 10 m
≤ 50 m
H1
≤ 40 m
H2
≤ 15 m
H3
≤ 4 m
H4
≤ 15 m
H5
≤ 0.1 m
For heat recovery systems (3 pipes)
•
The connection kit is taken into account from the side of the
(1)
indoor unit (as connection kit 1).
•
When the maximum equivalent refrigerant pipe length (L1)
(2)
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 in-
creased using the reducer (field-supplied).
•
Where the refrigerant pipe length is greater than 100 m,
(3)
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.
•
The pipe diameter -6- must be the same as that of the indoor
(4)
unit connection.
•
Where the liquid pipe length is greater than 15 m, use
(5)
9.53 mm diameter pipe and a reducer (field-supplied).
•
Keep a straight distance of 500 mm or greater after the con-
(6)
nection kit.
•
In the case of branches, where the pipe length between the
(7)
three-pipe branch -F- and the furthest indoor unit exceeds
5 m, use a T-branch pipe for the three-branch liquid pipe (cor-
responding to the same diameter, as per JIS B8607).
63
•
Where the number of connectable indoor units is greater
(8)
than four, the high/low-pressure gas, gas and liquid pipes, -4-,
-5- and -6-, must be increased by one measurement, respec-
tively.
Permitted pipe length
(13)
≥ Recommended number
of connected indoor units
≤ 300 m
(14)
≤ 165 m
≤ 190 m
≤ 40 m
≤ 30 m
CH-6.0N(1/2): ≤ 30 m
CH-10.0N(1/2): ≤ 10 m
≤ 10 m
≤ 50 m
≤ 40 m
≤ 15 m
≤ 4 m
≤ 15 m
≤ 0.1 m
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14/07/2014 12:28:29
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