22
Refrigerant Pipe Selection
MAIN OUTDOOR UNIT PIPE (L1) DIAMETER AND PIPE LENGTH BASED ON TOTAL CAPACITY
Model No. Liquid Pipe Length
Main Gas
(Vapor) Pipe
Diameter
Required
Main
Liquid Pipe
Diameter
Required
Maximum
Number of
Indoor Units
Indoor Unit
Branch Pipe
VPC018H4M-3P
Less than 148 ft. (45 m) 5/8 in. 3/8 in.
3
V8IDBP01
More than 148 ft. (45 m) 5/8 in. 3/8 in.
VPC024H4M-3P
Less than 148 ft. (45 m) 5/8 in. 3/8 in.
4
More than 148 ft. (45 m) 5/8 in. 3/8 in.
VPC036H4M-3PS
Less than 148 ft. (45 m) 5/8 in. 3/8 in.
5
More than 148 ft. (45 m) ¹ 3/4 in. 3/8 in.
VPC036H4M-3PD
Less than 148 ft. (45 m) ¹ 5/8 in. 3/8 in.
5
More than 148 ft. (45 m) 3/4 in. 3/8 in.
VPC048H4M-3P
Less than 148 ft. (45 m) ¹ 5/8 in. 3/8 in.
7
More than 148 ft. (45 m) 3/4 in. 3/8 in.
VPC060H4M-3P
Less than 148 ft. (45 m) 3/4 in. 3/8 in.
9
V8IDBP01
More than 148 ft. (45 m) ² 7/8 in. 3/8 in. V8IDBP02
1
Field provided 5/8 x 3/4 in. adaptor required for gas pipe connection.
2
Field provided 5/8 x 7/8 in. adaptor required for gas pipe connection.
MAIN OUTDOOR UNIT PIPE (L1) DIAMETER
AND ALLOWED LINE SET DIAMETER WITH
AIR HANDLER
Model No.
Main Outdoor Unit Pipe
Gas (Vapor)
Pipe
Diameter
Required
Liquid Pipe
Diameter
Required
VPC018H4M-3P ¹ 3/4 in. 3/8 in.
VPC024H4M-3P ¹ 3/4 in. 3/8 in.
VPC036H4M-3PS ¹ 3/4 in. 3/8 in.
VPC036H4M-3PD ¹ 3/4 in. 3/8 in.
VPC048H4M-3P ² 7/8 in. 3/8 in.
VPC060H4M-3P ² 7/8 in. 3/8 in.
1
Field provided 5/8 x 3/4 in. adaptor required for gas (vapor)
pipe connection at outdoor unit.
2
Field provided 5/8 x 7/8 in. adaptor required for gas (vapor)
pipe connection at outdoor unit.
Table 4. Main Outdoor Piping Sizes for Connection to VRF Indoor Units and AHU Control Kits
Table 5. Main Outdoor Piping Sizes for One-to-One Connection to Non-VRF Air Handler of Furnace New
Installations
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