19
A
B
C
Indoor unit
L1
Maximum Permitted Refrigerant Pipe Length and Maximum Height Difference - With Three Header Pipe Kits
NOTE - See Refrigerant Pipe Selection Table to size Main Outdoor Pipe.
Maximum Height Dif
ference
Outdoor Unit to Indoor Unit
M
aximum Height Di
ff
erenc
e
Indoor Unit to Indoor Unit
D
Mini-VRF
Heat Pump
Outdoor unit
F
E
L6
H
G
L4
L3
L5
Header Pipe Kit
V8HDRK04
NOTE - Header pipe kits should be placed between the Outdoor Unit and Indoor Units.
Header pipe kits cannot be connected in series.
NOTE - In applications requiring more than one Header pipe kit,
call Lennox VRF Applications Department for assistance.
Header Pipe Kit
V8HDRK04
Header Pipe Kit
V8HDRK04
Length and Maximum Height Difference
Maximum Permitted Length
Piping
Pipe Length
Total Piping Length (Actual)
≤492 ft. (150 m)
L1+A+B+C+D+E+F+G+
H+L3+L4+L5+L6
Maximum Piping Length
Actual
Length
≤296 ft. (90 m)
L1+L4+L6+A, L1+L4+L6+B,
L1+L4+L6+C, L1+L4+L6+D,
L1+L4+L5+E, L1+L4+L5+F,
L1+L3+H, L1+L3+G
Equivalent
Length
≤328 ft. (100 m)
Pipe length from the first Branch Pipe to each
indoor unit.
65.6 ft. (20 m)
L4+L6+A, L4+L6+B, L4+L6+C,
L4+L6+D, L4+L5+E, L4+L5+F,
L3+H, L3+G
≤ 65.6 ft. (20 m) each
Maximum
Height
Difference
Indoor Unit to Outdoor Unit
Maximum Height Difference
Outdoor
Unit Up
≤164 ft. (50 m)
- - -
Outdoor
Unit Down
≤131 ft. (40 m)
- - -
Indoor Unit to Indoor Unit Maximum Height
Difference
≤49 ft. (15 m)
- - -
NOTE - Each branch pipe equals 20 in. (508 mm) equivalent straight pipe length
Description
Designation
Main Outdoor Pipe - from outdoor unit to first Branch Pipe
L1
Main Indoor Pipe - from Branch Pipe to each header pipe
kit(s) or Branch Pipe
L3, L4, L5, L6
Indoor Unit Pipe - from header pipe kit(s) to indoor units
A, B, C, D, E, F. G. H
