II - 11
Design of W-ECO MULTI SYSTEM
2
TD831077
1. Model Selecting and Capacity Calculation
1-7. Capacity correction graph according to refrigerant tubing length and elevation
difference (For R22)
Elevation Total equivalent Cooling capacity Heating capacity
difference tubing length coefficient coefficient
Indoor unit 25: a 30 m 54.2 m 85.7 % 93.9 %
Indoor unit 12: b 30 m 60.8 m 83.8 % 93.0 %
Indoor unit 9: c 30 m 70.9 m 80.9 % 91.8 %
Indoor unit 18: d 34 m 61.8 m 83.2 % 92.9 %
Indoor unit 36: e 34 m 65.8 m 82.1 % 92.4 %
System example
1) Plus side of the elevation difference is when the outdoor unit is higher than the indoor unit.
2) Minus side of the elevation difference is when the outdoor unit is lower than the indoor unit.
3) The value of gas tube is used as equivalent length.
4) The capacity of each indoor unit is calculated by multiplying it with the capacity coefficient, as obtained from the total
equivalent lengths of main tubes and distribution branches which are directly connected to the indoor units.
5) Equivalent length conversion is not necessary for the optional distribution joint.
6) Total equivalent length is calculated by adding the straight equivalent length of joints to the actual length.
7) Model selection is done from the value calculated for total cooling and total heating.
Total equivalent tubing length (m)
Elevation Difference (m)
0
-10
-20
-30
10
20
30
40
50
10 20 30 40 50 60 70 80 90 100 110 120 125
98
96
94
92
90
86 84 82 80 78 74 72 70 68 66
abecd
726_8132
88
76
34
Cooling capacity coefficient
100
%
NOTE
Total equivalent tubing length (m)
Elevation Difference (m)
0
-10
-20
-30
10
20
30
40
50
10 20 30 40 50 60 70 80 90 100 110 120 125
99
98
97
96
95
94 93 92 91 90 89 88 87 86 85
abecd
607_8132
34
100
%
Heating capacity coefficient
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