Lennox VRF VEC027N432U, User Manual, Page: 13 / 36

DC Inverter Multi VRF System
9
Allowable
value
Fitting pipe
Height difference between ODU and
IDU
ODU at upper side 30m ——
ODU at lower side 30m ——
Height difference between IDUs 10m ——
Piping parameters of VEC048N432U , VEC055N432U , VEC060N432U .
Allowable
value
Fitting pipe
Total length (actual length) of fitting pipe 300m L1+L2+L3+a+b+c+d
Length of farthest fitting pipe (m)
Actual length 120m
L1+L2+L3+d
Equivalent length 150m
From the 1
st
branch to the farthest indoor pipe 40m L2+L3+d
Height difference between ODU and
IDU
ODU at upper side 50m ——
ODU at lower side 40m ——
Height difference between IDUs 15m ——
Fig 4.2.2.1 Allowable Length and Height Difference of Connection Pipe