14
Refrigerant Piping Connections
Figure 9. Typical Refrigerant Piping Diagram
Piping Length
Permitted value
Piping
Piping
Length
Maximum piping length
AHU Control Kit to
indoor unit coil
16 ft. (5 m)
L2
Level
Difference
Maximum level difference
AHU Control Kit to
indoor unit coil
+/- 16 ft. (5 m)
H2
Refer to the Calculation and Selection report for all pipe
sizes and lengths.
Refer to the outdoor unit manual for outdoor unit piping
connections.
The vapor line is run directly from the outdoor unit to the
indoor unit coil.
The liquid line is run from the outdoor unit to the AHU
Control Box (or EXV if removed from the box) and then
from the AHU Control Box (or EXV if removed from the
box) to the indoor unit coil.
Piping limitations shall be followed in all applications.
Contact VRF Technical Support, 1-844-438-8731, with
any questions.
NOTE - See Refrigerant Pipe Selection Table to size Pipes
n
o
it
a
n
g
i
s
e
D
n
o
it
p
ir
c
s
e
D
Liquid Pipe
Vapor Pipe
Air Handler Unit
Liquid Pipe
L2
Vapor Pipe
L2
L3
H2
AHU Kit with EXV or EXV
Outdoor Unit
or
MS Box
Designs with these kits require approval by the Lennox VRF Applications Team prior to installation.
Summary of Contents for VPB036H4M
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