Panasonic WU-216MF2U9 - Technical Data Manual - Page 32

Table 14 Correction coefficient for equivalent length when the size of the discharge tubes and suction tubes LM, is increased

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1. Model Selectionng and Capacity Calculator DeDseigsingnofo2f W3WAAYYVVRRF SYYSSTTEEMM The capacity loss that is caused by the tubing length can be reduced by increasing the sizes of the discharge tubes and suction tubes. See Table 14 and make the appropriate changes. However be sure that the total length does not exceed the maximum. * The only sizes which can be increased are the LM (main tube with the largest diameter) discharge tubes and suction tubes, and the changes are limited to those shown in Table 14. In addition, note that the additional refrigerant charge is determined only by the narrow-tube size. Table 14 Correction coefficient for equivalent length when the size of the discharge tubes and suction tubes (LM) is increased Standard tubing diameter discharge, suction tube in.(mm) ø1/2" ø5/8" ø3/4" ø7/8" 1-ø1/8" 1-ø3/8" 䠄ø12.7䠅 䠄ø15.88䠅 (ø19.05䠅 (ø22.22䠅 䠄ø28.58) 䠄ø34.92䠅 1 Tube diameter after change discharge, suction tube in.(mm) ø5/8" ø3/4" ø7/8" 1-ø1/8" 1-ø3/8" 1-ø5/8" 䠄ø15.88䠅 (ø19.05䠅 (ø22.22䠅 䠄ø28.58) 䠄ø34.92䠅 䠄ø41.28䠅 Equivalent length correction coefficient 0.4 0.4 0.5 0.4 0.5 0.5 * If the size of the discharge tubes and suction tubes (LM) have been increased, apply the correction coefficient from 2 Table 14 and calculate the equivalent length of the LM section. Equivalent length of tubing after size increase = Standard tubing equivalent length × Equivalent length correction coefficient 3 4 5 6 7 8 9 2 - 16

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Design of 3WAY VRF SYSTEM
2
- 16
2
1. Model Selection and Capacity Calculator
The capacity loss that is caused by the tubing length can be reduced by increasing the sizes of the discharge tubes and
suction tubes. See Table 14 and make the appropriate changes. However be sure that the total length does not exceed
the maximum.
* The only sizes which can be increased are the LM (main tube with the largest diameter) discharge tubes and suction tubes,
and the changes are limited to those shown in Table 14.
In addition, note that the additional refrigerant charge is determined only by the narrow-tube size.
Table 14 Correction coefficient for equivalent length when the size of the discharge tubes and suction tubes (LM)
is increased
* If the size of the discharge tubes and suction tubes (LM) have been increased, apply the correction coefficient from
Table 14 and calculate the equivalent length of the LM section.
Equivalent length of tubing after size increase
= Standard tubing equivalent length × Equivalent length correction coefficient
Equivalent length correction
coefficient
ø1/2"
ø12.7
ø5/8"
ø15.88
0.4
ø5/8"
ø15.88
ø3/4"
(ø19.05
0.4
ø3/4"
(ø19.05
ø7/8"
(ø22.22
0.5
ø7/8"
(ø22.22
1-ø1/8"
ø28.58)
0.4
1-ø1/8"
ø28.58)
1-ø3/8"
ø34.92
0.5
1-ø3/8"
ø34.92
1-ø5/8"
ø41.28
0.5
Tube diameter after change
discharge, suction tube
in.(mm)
Standard tubing diameter
discharge, suction tube
in.(mm)