2-13
Design of W-2WAY ECO-i SYSTEM Unit Specifications
Graph of indoor unit capacity characteristics (2 – (2))
Rate of cooling capacity change (%)
Indoor unit cooling capacity characteristics Indoor unit heating capacity characteristics
indicates the rating point. indicates the rating point.
Indoor air intake temp. (˚C WB)
Rate of heating capacity change (%)
Indoor air intake temp. (˚C DB)
120
110
100
90
80
110
105
100
95
90
14 15 16 17 18 19 20 21 22 23 24 25 15 16 17 18 19 20 21 22 23 24 25 26
27
Graph of capacity change characteristics resulting from tubing length and elevation difference (1 / 2 – (3))
<Cooling>
Elevation difference (m)
Base capacity
change rate
*1
92 90 88 86 84 82 80 78 76
94
96
98
100
%
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
50
40
30
20
10
0
–10
–20
–30
–40
Equivalent length (m)
Equivalent length (m)
<Heating>
Base capacity
change rate
The positive side for the elevation difference indicates that the outdoor unit is installed at a higher position than the indoor units.
The negative side indicates the opposite.
The capacity loss that is caused by the tubing length can be reduced by increasing the sizes of the discharge tubes and
suction tubes. Refer to Table 1 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) gas tubes, and the changes are
limited to those shown in Table 1.
In addition, note that the additional refrigerant charge is determined only by the narrow-tube size.
Table 1 Equivalent Length Correction Coefficient when the Size of the Discharge Tubes and Suction Tubes (LM) is
Increased
Standard tubing diameter
(gas tube, mm)
ø12.7 ø15.88 ø19.05 ø22.22 ø25.4 ø28.58 ø31.75 ø38.1
Tubing diameter after change
(gas tube, mm)
ø15.88 ø19.05 ø22.22 ø25.4 ø28.58 ø31.75 ø38.1 ø41.28
Equivalent length correction
coefficient
0.4 0.5 0.6 0.7
* If the size of the discharge tubes and suction tubes (LM) has been increased, apply the correction coefficient from Table 1
and calculate the equivalent length of the LM section.
Equivalent length of tubing after size increase
= Standard tubing equivalent length × Equivalent length correction coefficient
1. Model Selecting and Capacity Calculator
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