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8.3 Allowable pipe length and drop
Indoor unit
Length of the longest after the
Piping
length
Model
Allowable value
Piping part
Total length of piping (actual length)
AU282
50m
L1+L2+L3+L4+a+b+c+d+e
AU48~60
100m
Longest piping L
Actual length
AU282
35m
L1+L2+L3+L4+e
AU48~60
70m
Max. pipe length from 1st branch pipe to
indoor L
AU282
15m
L2+L3+L4+e
AU48~60
30m
Min. pipe length between branch pipe
and indoor L
15m
a, b, c, d, e
Drop
Drop between indoor
and outdoor unit H
Outdoor is upper
30m
——
Outdoor is lower
20m
——
Drop between indoor units h<10m
Note:
When the Max. pipe length between indoor and outdoor≥30m, the main pipe size of gas and liquid should be
increased.
When the Min. pipe length between branch pipe and indoor≥10m, the indoor pipe size should be increased
according to the following:
1. When rated capacity ≤5.6kW, the indoor gas/liquid pipe size changes to φ15.88/φ9.52;
2. When 16.8kW>rated capacity >5.6kW, the indoor gas/liquid pipe size changes to φ19.05/φ9.52;
3. When rated capacity ≥16.8kW, the indoor liquid pipe size changes to φ12.7.
