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5. Refrigerant Piping Work
5
[Pipe Diameter between Multi-Kit and Indoor Unit]
Indoor Unit HP
1.5 or less
2.0
2.5 to 6.0
8.0
10.0
16.0
20.0
*1. When the liquid piping length is longer than 15m, use ɸ9.52 pipe
and a reducer (field-supplied).
*2. As for some of the indoor unit types, if ɸ12.7 pipe is not available,
ɸ15.88 pipe should be used.
Make sure to check the indoor unit specifications.
NOTE:
•
The pipe diameter should be the same as the indoor
unit piping connection size.
5.6.2 Connection between Outdoor Units, Multi-Kits
and Indoor Units
•
Piping Work Conditions
Item
Total Piping Length
Maximum Piping
Length
Maximum Piping Length between
Multi-kit of 1st Branch and Each
Indoor Unit
Maximum Piping Length between
Each Multi-kit and Each Indoor
Unit
Piping Length between Piping
Connection Kit 1 and Each
Outdoor Unit
Height Difference
between Outdoor Units
and Indoor Units
Height Difference between Indoor
Units
Height Difference between
Outdoor Units
59
Diameter (φmm)
Gas Pipe
Liquid Pipe
*1
12.7
6.35
*2
*1
12.7
6.35
15.88
9.52
19.05
9.52
22.2
9.52
28.58
12.7
28.58
15.88
Allowable
Piping
Mark
Length
Total Liquid
Piping
≤ 1000
Actual Length
Actual
Length
L1
Equiv.
Length
L2
L3
La, Lb, Lc, Ld
O.U. is
Higher
*4
H1
O.U. is
Lower
*3, *5
H2
H5
*1. The maximum piping length of 110m is available on request. The
following restrictions apply when the height difference between
the outdoor units and the indoor units (the outdoor unit is higher)
are 50m or more.
•
•
•
•
•
*2. The maximum piping length of 110m is available on request. The
following restrictions apply when the height difference between
the outdoor units and the indoor units (the outdoor unit is lower)
are 40m or more.
•
•
•
*3. The piping length must be 15m or less when even one dedicated
outside air system (DOAS) is connected to the system.
*4. When there are height differences between outdoor units, use the
outdoor unit that has the largest height difference from the indoor
(m)
unit as the height reference.
*5. When H2 is 30m or more, the connectable indoor unit capacity
ratio is ≤ 100%.
*6. The piping length between outdoor units should be
≤ 200
La ≤ Lb ≤ Lc ≤ Ld ≤ 25m.
Lb - La ≤ 10m, Lc - La ≤ 10m, Ld - La ≤ 10m.
(If the piping length is incorrect, it may cause failure of outdoor
unit due to flowing back of the refrigerant.)
≤ 225
NOTES:
•
For 2, 3 and 4 outdoor unit combination, the
≤ 100
outdoor unit "A" should be connected to the piping
connection kit 1.
(Refer to items 5.5.2, 5.5.3 and 5.5.4 for the outdoor
≤ 40
unit models.)
For the details of piping connection, refer to the
Installation Manual for Piping Connection Kit.
≤ 25
*6
•
Keep the straight line distance of 500mm or more
after the piping connection kit.
*1
≤ 50
*2
≤ 40
≤ 40
≤ 2.0
The maximum outdoor temperature during cooling operation
is 43°C.
The height difference between the outdoor units and the
indoor units must be 50m or less when the outdoor units are
operated at an outside temperature of -10°C or less.
The connectable indoor unit capacity ratio is
To protect the system, the thermo OFF may be activated to
turn the system off when the outside temperature is 38°C or
more.
Performance priority mode is disabled.
The maximum outdoor temperature during cooling operation
is 43°C.
The minimum outdoor temperature during cooling operation
is 10°C.
The connectable indoor unit capacity ratio is
≤
100%.
≤
130%.
A16381Z84L-rev.1
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