Lennox VPA048H4 Installation & Operation Instructions page 19

Maximum Permitted Refrigerant Pipe Length and Maximum Height Difference - With Branch Box
Mini-VRF
Heat Pump
Outdoor unit
L1
Length and Maximum Height Difference
Total Piping Length (Actual)
Maximum Piping Length
Pipe Length
Pipe length from the fi rst Branch Pipe to each
indoor unit.
Indoor Unit to Outdoor Unit
Maximum
Maximum Height Difference
Height
Difference
Indoor Unit to Indoor Unit Maximum Height
Difference
NOTE - See Refrigerant Pipe Selection Table to size Main Outdoor Pipe.
Description
Main Outdoor Pipe - from outdoor unit to fi rst Branch Pipe
Main Indoor Pipe - from Branch Pipe to each Branch
Box(es) or Branch Pipe
Indoor Unit Pipe - from Branch Box(es) to indoor units
NOTE - Branch Box(es) should be placed between the Outdoor Unit and Indoor Units.
Branch Boxes cannot be connected in series.
NOTE - Refer to tables to ensure compliance with maximum piping distances.
Branch Box
L4
L6
A B
Actual
Length
Equivalent
Length
Outdoor
Unit Up
Outdoor
Unit Down
L3
Branch Box
L5
D
C
Indoor unit
Maximum Permitted Length
328 ft. (100 m)
148 ft. (45 m) (VPA036-048)
196 ft. (60 m) (VPA060)
164 ft. (50 m) (VPA036-048)
230 ft. (70 m) (VPA060)
65.6 ft. (20 m)
65.6 ft. (20 m)
65.6 ft. (20 m)
26.2 ft. (8 m)
19
Designation
L1
L3, L4, L5, L6
A, B, C, D, E, F. G. H
Branch Box
H
G
F
E
Piping
L1+A+B+C+D+E+F+G+
H+L3+L4+L5+L6
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
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
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