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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
Case 5
A210233
• 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 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 first branch to each indoor unit must not exceed 49 feet.
Table 16 —Piping Length
Table 17 —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 18 —Selection of L3~5, A~F
Item
Piping in the Figure
Maximum Length
Equivalent length
Total piping length
L1 + L3 + L4 + L5 + A + B + C + D + E + F + G
492
-
Maximum distance from ODU to farthest IDU
L1 + L4 + A, L1 + L4 + B, L1 + L4 + C, L1 + L4 + D, L1 +
L3 + E, L1 + L3 + L5 + F
L1 + L3 + L5 + G
296
328
First branch to farthest IDU
L4 + A, L4 + B, L4 + C, L4 + D,
L3 + E, L3 + L5 + F, L3 + L5 + G
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 *
3/8
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