Lennox VRF VEC027N432U, User Manual, Page: 15 / 36

DC Inverter Multi VRF System
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R410A Refrigerant system Total capacity of downstream indoor units X (kW) Model
Y type branch
X<20 VEBC01A
20≤X≤30 VEBC01B
30< X≤70
VEBC02A
70< X≤135
VEBC03A
135<X
VEBC04A
4.2.5 Dimension of Pipe between Indoor Branches
Select pipe between indoor branches according to the capacity of downstream indoor units; if the
capacity exceeds that of the outdoor unit, capacity of outdoor unit prevails.
Fig 4.2.5.1
Total capacity of downstream indoor units C (kW) Gas pipe (mm) Liquid pipe (mm)
C ≤ 5.6 Φ12.7 Φ6.35
5.6<C ≤ 14.2 Φ15.9 Φ9.52
14.2<C ≤ 22.4 Φ19.05 Φ9.52
4.2.6 Dimension of Pipe between Indoor Branch and IDU
Dimension of pipe between indoor branch and IDU should be consistent with the dimension of
indoor pipe.
Fig 4.2.6.1