18
PERFORMANCE DATA
COOLING CAPACITIES
Standard Ratings
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
Where h
ewb
= Enthalpy of air entering indoor coil.
3. The SHC is based on 80 F edb temperature of air entering evap-
orator coil.
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC
.
Correction Factor = 1.10 x (1 – BF) x (db – 80).
581B036 (3 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
900/0.14
1200/0.17
1500/0.20
Temp (F) Air Entering Evaporator — Ewb
72
67
62
72
67
62
72
67
62
75
TC
41.9
38.7
35.7
43.5
40.8
37.7
44.8
41.8
39.0
SHC
20.4
25.2
29.7
21.8
28.2
33.8
23.3
30.7
37.0
kW
2.19
2.16
2.12
2.21
2.18
2.15
2.23
2.19
2.16
85
TC
40.7
37.5
34.5
42.1
39.3
36.4
43.5
40.4
37.6
SHC
19.9
24.7
29.2
21.5
27.7
33.2
23.2
30.3
36.4
kW
2.46
2.42
2.39
2.47
2.44
2.41
2.50
2.45
2.42
95
TC
39.3
36.1
33.1
40.8
37.8
34.9
42.0
38.9
36.1
SHC
19.5
24.1
28.4
21.1
27.2
32.5
22.8
29.9
35.6
kW
2.75
2.71
2.66
2.77
2.73
2.69
2.79
2.74
2.71
105
TC
37.7
34.6
31.7
39.3
36.2
33.4
40.1
37.2
34.7
SHC
18.8
23.5
27.8
20.7
26.6
31.8
22.1
29.3
34.7
kW
3.06
3.02
2.98
3.09
3.04
3.01
3.10
3.06
3.03
115
TC
36.0
33.0
29.7
37.4
34.5
31.5
38.1
35.5
33.2
SHC
18.3
22.9
26.7
19.9
26.1
30.9
21.3
28.7
33.2
kW
3.41
3.36
3.31
3.43
3.39
3.34
3.44
3.41
3.37
125
TC
34.2
31.3
27.8
35.6
32.7
29.4
36.3
33.6
31.9
SHC
17.6
22.2
25.8
19.4
25.4
29.4
20.8
28.0
31.8
kW
3.78
3.73
3.66
3.80
3.76
3.71
3.81
3.78
3.75
581B048 (4 TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
1200/0.17
1450/0.19
1600/0.21
2000/0.24
Temp (F) Air Entering Evaporator — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
54.0
50.7
44.2
55.9
52.2
47.7
56.4
52.8
49.1
58.1
54.5
50.6
SHC
26.1
32.7
37.5
27.6
35.1
41.8
28.2
36.2
43.8
30.2
39.5
47.5
kW
2.81
2.80
2.76
2.83
2.81
2.78
2.83
2.80
2.79
2.84
2.82
2.79
85
TC
52.2
48.9
41.9
54.1
50.4
45.9
54.5
51.0
47.2
55.3
52.3
48.7
SHC
25.4
32.0
36.4
26.9
34.5
40.8
27.5
35.7
42.8
28.6
38.5
46.6
kW
3.20
3.19
3.15
3.22
3.20
3.17
3.22
3.20
3.18
3.22
3.20
3.18
95
TC
50.7
46.9
39.5
51.9
48.4
43.5
52.5
48.9
45.2
53.9
50.1
46.7
SHC
24.9
31.1
35.0
26.1
33.6
39.6
26.8
34.7
41.8
28.8
37.5
45.6
kW
3.64
3.61
3.57
3.65
3.62
3.60
3.65
3.62
3.60
3.67
3.63
3.61
105
TC
48.8
44.5
36.7
49.8
46.2
40.7
50.2
46.7
42.1
51.5
48.2
44.7
SHC
24.3
30.2
33.6
25.3
32.8
38.2
26.0
33.9
40.3
27.9
37.4
44.4
kW
4.12
4.09
4.03
4.12
4.09
4.06
4.12
4.09
4.07
4.14
4.11
4.08
115
TC
46.5
41.1
34.3
47.7
43.3
37.0
48.0
44.4
38.5
48.9
45.7
42.0
SHC
23.4
28.9
32.4
24.9
31.8
36.3
25.4
33.4
38.3
27.1
36.9
42.0
kW
4.64
4.59
4.53
4.65
4.62
4.55
4.64
4.63
4.56
4.65
4.63
4.60
125
TC
43.8
37.5
32.4
45.1
39.0
33.8
45.3
40.1
35.4
46.3
42.6
38.8
SHC
22.5
27.4
31.5
24.1
30.2
33.7
24.7
31.9
35.4
26.5
35.9
38.8
kW
5.19
5.13
5.05
5.20
5.15
5.09
5.19
5.17
5.11
5.20
5.19
5.15
BF
—
Bypass Factor
Edb —
Entering Dry Bulb
Ewb —
Entering Wet Bulb
kW
—
Compressor Motor Power Input
SHC —
Sensible Heat Capacity (1000 Btuh) Gross
TC
—
Total Capacity (1000 Btuh) Gross
t
ldb
= t
edb
–
sensible heat capacity (Btuh)
1.10 x cfm
t
lwb
= wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (h
lwb
)
h
lwb
= h
ewb
–
total capacity (Btuh)
4.5 x cfm
