Lennox VEP042N432U - Allowable Piping Lengths and Height Differences

DC Inverter Multi VRF System
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4.2.2 Allowable Length and Height Difference of Connection Pipe
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown
in the figure below:
NOTE:
Equivalent length of one Y-type branch is 0.5m.
Fig.8 Allowable Length and Height Difference of Connection Pipe
Piping parameters of VEP027N432US,
VEP034N432US, VEP042N432US.
Allowable
value
Fitting pipe
Total length (actual length) of fitting pipe
250m
L1+L2+L3+a+b+c+d
Length of farthest fitting pipe (m)
Actual length
100m
L1+L2+L3+d
Equivalent length
120m
From the 1
st
branch to the farthest indoor pipe 40m L2+L3+d
Height difference between ODU and
IDU
ODU at upper side
30m
——
ODU at lower side
30m
——
Height difference between IDUs
10m
——