Piping Design - Carrier 38VMH-1P Service Manual

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Piping Design

Case 1
• Bends in piping cause pressure loss during transportation of the refrigerant, so fewer bends increase performance.
• The equivalent length of each bend is 1.64 feet.
• The equivalent length of each Y-Joint is 1.64 feet.
• Total "downstream indoor capacity" is the total capacity of all the indoor units connected downstream.
For example, Y-joint ⑤ is connected with IDU4 and IDU5 (40VMF009A--3 + 40VMM007A--3), which has a downstream indoor
capacity of 16k (Capacity index 9 + 7 = 16).
• The pipe length difference from the first branch to each indoor unit must not exceed 65 feet.
For example, the distance from IDU1 to the first branch is L3 + A, the distance from IDU6 to the first branch is L2, while the distance
from IDU5 to the first branch is L3 + L4 + L5 + L6 + E, so make sure that |L2 - (L3 + A)|, |L2 - (L3 + L4 + L5 + L6 + E)| and |(L3 + L4
+ L5 + L6 + E) - (L3 + A)| are all less than 65 feet.
ITEM
Total piping length
Maximum distance from ODU to farthest IDU
First branch to farthest IDU
Height between ODU and IDU (ODU above IDU)
Height between ODU and IDU (ODU below IDU)
Height between IDU and IDU
Height between first branch to IDU
*1 If only one IDU connects to the ODU, the total piping length must not exceed 328 feet.
Model
38VMB036HDS3-1
38VMB048HDS3-1
38VMB060HDS3-1
*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.
Downstream Indoor Capacity (Kbtu/h)
Capacity ≤ 15K
15K < Capacity ≤ 78K
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 15 —Piping Design - Case 1
Table 4 —Piping Length
PIPING in the FIGURES
L1 + L2 + L3 + L4 + L5 + L6 + A + B + C + D + E
L1 + L3 + L4 + L5 + L6 + E
L3 + L4 + L5 + L6 + E
H
H'
h1
h2
Table 5 —Selection of "L1"
Gas Pipe
5/8 *
3/4 *
Table 6 —Selection of L2~L6, A, B, C, D, E
Gas Pipe
1/2
5/8
6
MAXIMUM LENGTH EQUIVALENT
492*1
296
131
164
131
49
49
Liquid Pipe
3/8
Liquid Pipe
1/4
3/8
A210229
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328
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