20
INDOOR MAIN PIPE SELECTION (L3, L4, L5, L6)
Downstream Indoor Unit
Capacity (Btu/h)
Gas Pipe Diameter
Liquid Pipe Diameter
Indoor Unit Branch Pipe
A < 56,700
5/8 in.
3/8 in.
V8IDBP01
56,700 < A < 78,500
3/4 in.
3/8 in.
V8IDBP01
MAIN OUTDOOR UNIT PIPE (L1) DIAMETER AND PIPE LENGTH BASED ON TOTAL CAPACITY
Model No. Capacity
Liquid Pipe Length
Main
Gas Pipe
Diameter
Required
Main
Liquid Pipe
Diameter
Required
Maximum
Number of
Indoor Units
Indoor Unit
Branch Pipe
VPB036H4 3 Ton
Less than 148 ft. (45 m)
5/8 in.
3/8 in.
5
V8IDBP01
More than 148 ft. (45 m)
3/4 in.
VPB048H4 4 Ton
Less than 148 ft. (45 m)
5/8 in.
3/8 in.
7
More than 148 ft. (45 m)
3/4 in.
VPB060H4
5 Ton
Less than 148 ft. (45 m)
3/4 in.
3/8 in.
9
V8IDBP01
More than 148 ft. (45 m)
7/8 in.
V8IDBP02
NOTES:
Use appropriate reducer/adapter (not provided) at the outdoor unit pipe connections to meet the piping size requirements.
Refrigerant Pipe Selection
INDOOR UNIT COMBINATION RATIO
Indoor Units
Combination Ratio
Total Piping Length
Standard indoor units (Except VVCB and VHIB)
45% - 130%
≤ 492 ft.
Standard indoor units (Includes VVCB or VHIB)
45% - 100%
≤ 492 ft.
100% - 130%
≤ 328 ft.
Contains AHU Control Kit
45% - 100%
≤ 492 ft.
Only VOSB indoor unit
45% - 100%
≤ 492 ft.
VOSB and other types of indoor units
Not allowed
Not allowed
