Lennox VPA048H4 Installation & Operation Instructions page 18

Maximum Permitted Refrigerant Pipe Length and Maximum Height Difference - With Branch Box
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)
Indoor Unit Pipe - from Branch Box(es) to indoor units
Mini-VRF
NOTE - Branch Box(es) should be placed between the Outdoor Unit and Indoor Units.
NOTE - Refer to tables to ensure compliance with maximum piping distances.
L3
L4
A B
Branch Boxes cannot be connected in series.
Branch Box
D
Maximum Permitted Length
328 ft. (100 m)
148 ft. (45 m) (VPA036-048)
Actual Length
196 ft. (60 m) (VPA060)
164 ft. (50 m) (VPA036-048)
Equivalent
Length
230 ft. (70 m) (VPA060)
65.6 ft. (20 m)
Outdoor Unit
65.6 ft. (20 m)
Up
Outdoor Unit
65.6 ft. (20 m)
Down
26.2 ft. (8 m)
18
Designation
L1
L3, L4
A, B, C, D, E, F
Branch Box
F
C
Indoor unit
L1+A+B+C+D+E+F+L3+L4
L1+L4+A, L1+L4+B,
L1+L4+C, L1+L4+D,
L1+L3+E, L1+L3+F
L4+A, L4+B, L4+C, L4+D,
≤ 65.6 ft. (20 m) each
E
Piping
L3+E, L3+F
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