:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
Case 2
A210230
Fig. 16 —Piping Design (Case 2)
• Bends in piping cause pressure loss during transportation of refrigerant, so fewer bends increase performance.
• The equivalent length of each bend is 1.64 feet.
• The equivalent length header is 1.64 feet.
• The pipe length difference between each IDU must not exceed 49 feet.
Table 7 —Piping Length
Table 8 —Selection of “L1”
*When the length of L1 > 230 feet, the gas pipe should be increased from 5/8” to 3/4” or from 3/4” to 7/8”. The pipe adapter must be
located as close as possible to the ODU.
Table 9 —Selection of A~D
Item Piping in the Figure Maximum Length Equivalent Length
Total piping length L1 + A + B + C + D 492 -
Maximum distance from ODU to farthest IDU L1 + A, L1 + B, L1 + C, L1 + D 296 328
First branch (Header) to farthest IDU A, B, C, D 131 -
Height between ODU and IDU (ODU above IDU) H 164 -
Height between ODU and IDU (ODU below IDU) H’ 131 -
Height between IDU and IDU h1 49 -
Height between first branch (header) and IDU h2 49 -
Model Gas Pipe Liquid Pipe
38VMB036HDS3-1
5/8 *
3/8
38VMB048HDS3-1
38VMB060HDS3-1 3/4 *
Downstream Indoor Capacity (KBtu/h) Gas Pipe Liquid Pipe
Capacity ≤ 15K 1/2 1/4
15K < Capacity ≤ 78K 5/8 3/8
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