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4-4. CORRECTING COOLING AND HEATING CAPACITY
4-4-1. Correcting changes in air conditions
(1) The performance curve charts (Figure 1, 2) show the ratio by the temperature condition change when the rated capacity (total
capacity) and the rated input are presumed 1, under standard length (7.6 m [25 ft]) and standard temperature condition.
• Standard conditions:
• Use the rated capacity and rated input given in "4-2.".
• The input is the single value on the side of the outdoor unit; the input on the sides of each indoor unit must be added to
obtain the total input.
(2) The capacity of each indoor unit may be obtained by multiplying the total capacity obtained in (1) by the ratio between the
individual capacity at the rated time and the total capacity at the rated time.
Individual capacity under stated conditions = total capacity under the stated conditions o
(3) Capacity correction coefficient curve
Figure 1 Cooling performance curve
1.4
1.3
1.2
1.1
1.0
Ratio of cooling capacity
0.9
0.8
0.7
0.6
1.4
1.3
1.2
1.1
Ratio of power input
1.0
0.9
0.8
0.7
0.6
-10
0
10
20
14
32
50
68
OUTDOOR
OCH502C
Indoor
Rated cooling capacity
Outdoor D.B. 35°C [D.B.95°F]
Indoor
Rated heating capacity
Outdoor D.B. 8.3°C / W.B. 6.1°C [D.B.47°F / W.B.43°F]
:WB (°FWB)
24 (75.2)
22 (71.6)
20 (68)
18 (64.4)
16 (60.8)
INDOOR
:WB(°FWB)
24 (75.2)
22 (71.6)
20 (68)
18 (64.4)
16 (60.8)
INDOOR
50 [°CDB]
30
40
122 [°FDB]
86
104
D.B. 26.7°C / W.B. 19.4°C [D.B.80°F / W.B.67°F]
D.B. 21.1°C [D.B.70°F]
individual capacity at the rated time
Figure 2 Heating performance curve
1.4
1.3
1.2
Ratio of heating capacity
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
1.4
1.3
Ratio of power input
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
-25
-20
-15
-10
-13
-4
5
14
OUTDOOR
14
total capacity at the rated time
-5
0
5
10
15
20
23
32
41
50
59
68
:DB (°FDB)
15 (59)
21.1 (70)
25 (77)
27.2 (81)
INDOOR
:DB(°FDB)
15 (59)
21.1 (70)
25 (77)
27.2 (81)
INDOOR
[°CWB]
[°FWB]
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