Lennox VPA048H4 Installation & Operation Instructions page 17

Maximum Permitted Refrigerant Pipe Length and Maximum Height Difference - With Branch Box
Heat Pump
Outdoor unit
Length and Maximum Height Difference
Total Piping Length (Actual)
Maximum Piping Length
Pipe Length
Pipe length (from the Branch Box 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 branch box
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 - In applications requiring more than one Branch Box,
Branch Box
L1
A B
Branch Boxes cannot be connected in series.
call Lennox VRF Applications Department for assistance.
D
Indoor unit
Maximum Permitted Length
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)
Outdoor Unit Up
Outdoor Unit Down
17
Designation
L1
A, B, C, D
C
328 ft. (100 m)
65.6 ft. (20 m)
65.6 ft. (20 m)
65.6 ft. (20 m)
26.2 ft. (8 m)
Piping
L1+A+B+C+D
L1+A, L1+B,
L1+C, L1+D
A, B, C, D
≤ 65.6 ft. (20 m) each
- - -
- - -
- - -