Bryant 549B User Manual
Page 85
85
PERFORMANCE DATA — 549B, 549C (cont)
COOLING CAPACITIES (cont)
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 indoor coil
3. 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.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
549C036 (3 Tons)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
900/0.05
1200/0.07
1500/0.09
Indoor Entering Air — Ewb (F)
62
67
72
62
67
72
62
67
72
75
TC
36.4
39.9
43.5
38.5
42.1
45.4
40.1
43.2
46.1
SHC
31.0
26.2
21.2
36.0
29.9
23.1
40.0
33.1
24.6
kW
2.08
2.09
2.12
2.09
2.11
2.14
2.10
2.13
2.15
85
TC
34.9
38.7
42.2
37.0
40.6
44.1
38.8
41.8
45.3
SHC
30.3
25.8
20.7
35.3
29.5
22.8
38.8
32.9
24.7
kW
2.34
2.36
2.38
2.35
2.37
2.40
2.37
2.39
2.42
95
TC
31.3
36.9
40.9
33.6
38.8
42.6
37.3
40.1
43.7
SHC
28.6
25.1
20.3
33.6
29.0
22.5
37.3
32.5
24.4
kW
2.62
2.65
2.67
2.64
2.67
2.69
2.67
2.68
2.70
105
TC
27.1
33.0
39.1
30.3
35.5
41.0
34.3
37.3
42.1
SHC
26.5
23.5
19.6
30.3
27.7
22.1
34.2
31.5
24.2
kW
2.92
2.96
3.01
2.95
2.99
3.02
2.98
3.01
3.02
115
TC
23.9
27.9
34.7
27.5
30.1
38.1
30.6
32.2
39.7
SHC
23.9
21.5
18.1
27.5
25.6
21.2
30.6
29.5
23.6
kW
3.23
3.29
3.35
3.29
3.32
3.37
3.32
3.33
3.38
125
TC
21.4
23.7
31.8
24.4
25.6
33.2
27.2
27.2
34.5
SHC
21.4
19.9
17.1
24.4
23.7
19.6
27.1
27.2
22.0
kW
3.59
3.63
3.71
3.65
3.67
3.73
3.69
3.69
3.75
549C048 (4 Tons)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
1200/0.03
1600/0.04
2000/0.06
Indoor Entering Air — Ewb (F)
62
67
72
62
67
72
62
67
72
75
TC
44.5
49.6
54.8
46.7
51.8
56.8
48.6
52.9
58.2
SHC
38.5
32.5
26.2
45
37.4
28.8
48.6
41.6
31.3
kW
2.41
2.42
2.44
2.41
2.43
2.45
2.42
2.44
2.46
85
TC
42.2
47.6
52.7
44.6
49.8
54.8
47.3
51
56.2
SHC
37.6
31.8
25.5
44
36.7
28.2
47.3
41.2
30.8
kW
2.76
2.77
2.79
2.77
2.78
2.8
2.77
2.79
2.81
95
TC
39.1
45.2
50.8
41.8
47.3
53.1
45.4
48.5
54.3
SHC
36.2
30.9
24.9
41.7
35.9
27.9
45.4
40.6
30.7
kW
3.13
3.16
3.18
3.15
3.18
3.19
3.17
3.18
3.2
105
TC
36.4
41.5
48.1
38.5
43.3
50.4
42.6
45
51.6
SHC
34.9
29.5
24
38.4
34.5
27.2
42.6
39.4
30
kW
3.53
3.57
3.6
3.56
3.59
3.62
3.59
3.61
3.62
115
TC
32.4
36.7
44.6
34.7
38.1
47
38.1
39.3
48.3
SHC
32.4
27.7
22.8
34.7
32.7
26.2
38.1
37.3
29.2
kW
3.96
4
4.06
4
4.02
4.08
4.03
4.04
4.09
125
TC
29.9
33.2
36.4
31.1
32.2
33.4
34.2
34
33.7
SHC
29.9
26.4
22.9
31.1
30.4
29.8
34.2
33.9
33.6
kW
4.43
4.46
4.5
4.47
4.48
4.49
4.5
4.5
4.5
BF
— Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW
— Compressor Motor Power Input
SHC — Gross Sensible Heat Capacity (1000 Btuh)
TC
— Gross Total Capacity (1000 Btuh)
t
ldb
= t
edb
–
sensible capacity (Btuh)
1.10 x cfm
h
lwb
= h
ewb
–
total capacity (Btuh)
4.5 x cfm
BYPASS
FACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)
79
78
77
76
75
under 75
81
82
83
84
85
over 85
Correction Factor
.05
1.04
2.07
3.11
4.14
5.18
Use formula
shown below.
.10
.98
1.96
2.94
3.92
4.90
.20
.87
1.74
2.62
3.49
4.36
.30
.76
1.53
2.29
3.05
3.82
549
B, 5
49C