16
6
A
B
C
D
E
First Branch Pipe
Indoor Units
Maximum Piping Equivalent Length
L3
L2
L4
L5
L
L1
Mini-VRF
Heat Pump
Outdoor unit
Maximum Permitted Refrigerant Pipe Length and Maximum Height Difference - With Branch Pipe
Maximum Height Difference
Outdoor Unit to Indoor Unit
Maximum Height Difference
Indoor Unit to Indoor Unit
NOTE - See Refrigerant Pipe Selection Table to size Main Outdoor Pipe.
First Branch Pipe to farthest Indoor Unit
Length and Maximum Height Dierence Maximum Permitted Length Piping
Pipe Length
Total Piping Length (Actual) ≤492 ft. (150 m)
L1+L2+L3+L4+L5+L6
+A+B+C+D+E
Maximum Piping Length
Actual Length ≤296 ft. (90 m)
L1+L3+L4+L5+L6+E
Equivalent Length ≤328 ft. (100 m)
Pipe length (from the rst line branch pipe to farthest
indoor unit)
≤131 ft. (40 m) L3+L4+L5+L6+E
Maximum
Height
Dierence
Indoor Unit to Outdoor Unit
Maximum Height Dierence
Outdoor Unit Up ≤164 ft. (50 m) - - -
Outdoor Unit
Down
≤131 ft. (40 m) - - -
Indoor Unit to Indoor Unit Maximum Height Dierence ≤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 rst branch pipe L1
Main Indoor Pipe - from branch pipe to branch pipe L3, L4, L5, L6
Indoor Unit Pipe - from branch pipe to indoor unit L2, A, B, C, D, E
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