:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
9
Case 4
A210232
Fig. 17 —Piping Design (Case 4)
• Bends in piping cause pressure loss during transportation of refrigerant, so fewer bends increases performance.
• The equivalent length of each bend is 1.64 feet.
• The equivalent length of each Y-Joint or header is 1.64 feet.
• Total “downstream indoor capacity” is the total capacity of all the indoor units connected downstream.
• The pipe length difference from the first branch to each indoor unit must not exceed 49 feet.
Table 13 —Piping Length
Table 14 —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 outdoor unit.
Table 15 —Selection of L3~5, A~F
Item Piping in the Figure Maximum Length Equivalent Length
Total piping length L1 + L3 + L4 + L5 + L6 + A + B + C + D + E + F + G + H 492 -
Maximum distance from ODU to farthest IDU
L1 + L4 + A, L1 + L4 + B, L1 + L4 + C, L1 + L4 + D, L1 +
L3 + L6 + E, L1 + L3 + L6 + F
L1 + L3 + L5 + G, L1 + L3 + L5 + H
296 328
First branch to farthest IDU
L4 + A, L4 + B, L4 + C, L4 + D, L3 + L6 + E, L3 + L6 + F,
L3 + L5 + G, L3 + L5 + H
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 and IDU h2 49 -
Model Gas Pipe Liquid Pipe
38VMB036HDS3-1
5/8 *
3/838VMB048HDS3-1
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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