16
COOLING CAPACITIES
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air leav-
ing indoor coil (h
lwb
)
Where: h
ewb
= Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering indoor
coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
50TFQ004 (3 TONS)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
900/0.10
1200/0.15
1500/0.21
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
75
TC
42.4
39.9
36.5
43.0
41.2
38.7
45.1
42.8
40.3
SHC
16.7
22.0
26.8
17.5
24.2
30.9
19.3
26.9
34.1
kW
2.77
2.71
2.62
2.78
2.74
2.68
2.85
2.79
2.73
85
TC
41.5
38.4
34.8
43.3
40.4
37.0
44.0
41.7
38.7
SHC
16.6
21.6
26.2
18.2
24.6
30.3
19.3
27.2
33.7
kW
3.01
2.92
2.80
3.07
2.98
2.88
3.09
3.03
2.94
95
TC
40.0
36.3
33.0
42.3
38.5
35.2
43.4
40.0
36.7
SHC
16.2
20.9
25.7
18.2
24.2
29.8
19.7
27.2
32.7
kW
3.24
3.10
2.99
3.32
3.19
3.07
3.36
3.24
3.13
105
TC
38.4
34.7
31.0
40.0
36.7
33.1
41.2
37.7
35.2
SHC
15.7
20.5
24.8
17.5
23.9
28.8
19.3
26.6
31.7
kW
3.47
3.32
3.16
3.53
3.41
3.26
3.58
3.44
3.35
115
TC
36.1
32.5
28.9
38.1
34.3
31.1
39.3
35.5
33.2
SHC
15.1
19.8
23.9
17.2
23.2
27.8
19.1
26.2
30.2
kW
3.66
3.50
3.32
3.76
3.59
3.44
3.81
3.65
3.54
125
TC
34.2
30.5
26.8
35.9
32.0
29.3
36.8
33.0
31.3
SHC
14.6
19.2
22.9
16.7
22.6
26.3
18.5
25.5
28.4
kW
3.88
3.68
3.49
3.97
3.77
3.62
4.02
3.83
3.74
50TFQ005 (4 TONS)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
1200/0.11
1600/0.15
2000/0.22
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
75
TC
55.5
51.9
47.4
56.9
54.6
50.3
59.3
56.5
52.1
SHC
24.5
31.2
37.4
26.0
35.2
43.4
28.4
39.0
47.6
kW
3.80
3.70
3.55
3.84
3.79
3.66
3.93
3.86
3.71
85
TC
53.4
49.7
45.3
56.3
52.6
47.8
57.5
54.1
49.8
SHC
23.8
30.4
36.7
26.3
34.9
42.6
28.3
38.6
46.9
kW
4.10
3.99
3.84
4.23
4.11
3.94
4.27
4.16
4.01
95
TC
52.0
47.4
43.0
53.7
49.9
45.5
54.5
51.6
47.4
SHC
23.4
29.6
35.8
25.5
33.9
41.6
27.3
38.2
45.2
kW
4.47
4.28
4.11
4.53
4.39
4.23
4.56
4.48
4.29
105
TC
49.3
45.0
40.6
51.8
47.2
43.0
52.6
48.7
45.4
SHC
22.5
28.8
34.7
25.3
33.0
40.3
27.1
37.1
43.3
kW
4.77
4.59
4.39
4.90
4.68
4.52
4.92
4.76
4.63
115
TC
46.6
42.4
38.0
48.8
44.6
40.6
50.2
45.8
43.2
SHC
21.7
27.9
33.6
24.3
32.4
38.7
26.8
36.1
41.2
kW
5.08
4.90
4.66
5.21
5.01
4.81
5.29
5.06
4.96
125
TC
44.0
39.6
35.4
45.6
41.6
38.3
47.0
42.9
40.9
SHC
20.9
26.9
32.4
23.3
31.6
36.5
25.9
35.6
39.0
kW
5.45
5.21
4.96
5.51
5.34
5.14
5.60
5.41
5.30
BF
—
Bypass Factor
Edb —
Entering Dry-Bulb
Ewb —
Entering Wet-Bulb
kW
—
Compressor Motor Power Input
Ldb —
Leaving Dry-Bulb
Lwb —
Leaving Wet-Bulb
SHC —
Sensible Heat Capacity (1000 Btuh) Gross
TC
—
Total Capacity (1000 Btuh) Gross
t
ldb
= t
edb
–
sensible capacity (Btuh)
1.10 x cfm
h
lwb
= h
ewb
–
total capacity (Btuh)
4.5 x cfm
Performance data
