Design of 3WAY VRF SYSTEM
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1. Model Selection and Capacity Calculator
Design of 2WAY VRF SYSTEM
1. Model Selecting 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"
䠄ø12.7䠅
ø5/8"
䠄ø15.88䠅
0.4
ø5/8"
䠄ø15.88䠅
ø3/4"
(ø19.05䠅
0.4
ø3/4"
(ø19.05䠅
ø7/8"
(ø22.22䠅
0.5
ø7/8"
(ø22.22䠅
1-ø1/8"
䠄ø28.58)
0.4
1-ø1/8"
䠄ø28.58)
1-ø3/8"
䠄ø34.92䠅
0.5
1-ø3/8"
䠄ø34.92䠅
1-ø5/8"
䠄ø41.28䠅
0.5
Tube diameter after change
discharge, suction tube
in.(mm)
Standard tubing diameter
discharge, suction tube
in.(mm)
TD831183-00_北米向け3WAY.indb 16 15/12/17 16:05:10
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