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9.4 System piping (length) limitations
9.4.1 Piping length restrictions
Make sure to perform the piping installation within the range of the maximum allowable pipe length, allowable height
difference and allowable length after branching as indicated below. 3 patterns will be discussed, including VRV
indoor units combined with Mini-split indoor units.
Definitions
Actual piping length: pipe length between outdoor*1 and indoor units.
•
Equivalent piping length: pipe length between outdoor*1 and indoor units (Assume equivalent piping length of
•
REFNET joint = 0.5 m and REFNET header = 1 m (for calculation purposes of equivalent piping length, not for
refrigerant charge calculations).).
Total piping length: total piping length from the outdoor*1 to all indoor units.
•
*1 I n case of multi outdoor system, re-read to the first outdoor unit multi connection piping kit as seen from the
indoor unit.
9.4.2 System only containing VRV indoor units
System setup
Branch with REFNET joint
Branch with REFNET joint
and REFNET header
Branch with REFNET header
Difference in height between outdoor and indoor units: H1.
Difference in height between indoor and indoor units: H2.
Difference in height between outdoor and outdoor units: H3.
01_EN_3P748230-1.indd 19
Single outdoor
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Example 1.1
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Example 1.2.1
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Example 1.2.2
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Example 1.3
Multi outdoor
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Example 2.2.1
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Example 2.2.2
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Indoor unit
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Outdoor unit multi connection piping kit
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Example 2.1
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Example 2.3
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23/01/2023 17:24:14
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