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BU Module
12
5 Installation of Refrigerant Pipes
5.1 Allowable Length and Drop Height of Connecting Pipe
Fig. 15 (8 indoor units)
Table 8
The sorts The pipes Length(m/feet)
Maximum
allowable
length
Total length between outdoor unit and BU
modules
L1+L2+L3+L4+L5 ≤55(181)
Total length
between indoor
units and BU
1A+1B+1C+2A+2B+2C+
3A+3B
ISMO-6021 ≤90(295)
Between indoor unit and BU module 1A;1B;1C;2A;2B;2C;3A;3B ≤15(49)
Between indoor unit and the 1st branch
L4+1B;L2+L5+2A;
L2+L3+3B
≤40(131)
Maximum
allowable
length
Between outdoor and indoor units H1 ≤30(99)
Between outdoor units and BU modules H2 ≤30(99)
Between BU and BU modules H3 ≤15(49)
Between indoor and indoor units H4 ≤15(49)
Minimum
allowable
length
Between outdoor and the 1st branch L1 ≥5(16)
Between BU and the branch L3;L4;L5
as possible as
short
NOTICE! BU module should be placed within the level between the outdoor unit and indoor
unit.
5.2 Installation of Piping Adapter (IS-BU12 IS-BU13 and IS-BU15)
If the piping connection size of BU module does not match with that of the outdoor unit and
indoor units, it should prevail with the piping connection size of the outdoor unit and indoor units.
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