Bryant COMMERCIAL SINGLE PACKAGE ROOFTOP GAS HEAT/ELECTRIC COOLING 581B User Manual page 20

581B090 (7 1
Temp (F)
Air Ent
Condenser
(Edb)
TC
75
SHC
kW
TC
85 SHC
kW
TC
95 SHC
kW
TC
105 SHC
kW
TC
115 SHC
kW
TC
125 SHC
kW
581B102 (8 1 / TONS)
2
Temp (F)
Air Ent
Condenser
(Edb)
72
TC 119.5
75 SHC 56.5
kW 5.92
TC 115.5
85 SHC 55.1
kW 6.77
TC 111.3
95 SHC 53.7
kW 7.71
TC 107.2
105 SHC 52.2
kW 8.75
TC 101.9
115 SHC 50.2
kW 9.80
TC 97.3
125 SHC 48.7
11.03
kW
Standard Ratings
LEGEND
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
PERFORMANCE DATA (cont)
COOLING CAPACITIES (cont)
/ TONS)
2
Temp (F) Air Entering Evaporator — Cfm/BF
2250/0.10
Temp (F) Air Entering Evaporator — Ewb
72 67 62
105.5 96.9 87.6
50.6 63.6 75.7
5.15 5.07 5.04
102.5 93.6 83.6
49.7 62.4 73.9
5.86 5.79 5.73
98.9 90.1 79.3
48.5 61.2 71.9
6.65 6.58 6.49
95.3 86.2 75.7
47.3 59.6 70.2
7.51 7.44 7.31
91.0 82.0 71.6
45.9 58.0 68.1
8.43 8.33 8.20
86.2 77.8 68.1
44.1 56.4 66.3
9.38 9.29 9.14
Temp (F) Air Entering Evaporator — Cfm/BF
2550/0.08
Temp (F) Air Entering Evaporator — Ewb
67 62 72
105.7 94.8 123.1
65.7 77.8 60.2
5.84 5.77 5.95
101.9 90.6 119.7
64.3 76.1 58.9
6.69 6.61 6.83
97.7 86.6 115.0
62.8 74.2 57.4
7.62 7.52 7.76
93.5 82.5 110.5
61.3 72.7 56.0
8.64 8.54 8.80
89.2 78.0 104.7
59.5 70.7 53.7
9.73 9.64 9.86
84.3 73.1 100.0
57.7 68.5 52.4
10.90 10.70 11.08
3000/0.11
72 67 62
107.3 99.6 90.7
53.3 69.2 83.7
5.16 5.11 5.06
105.1 96.5 87.5
52.8 68.4 82.2
5.89 5.82 5.77
101.6 92.9 83.5
51.9 67.2 80.2
6.69 6.61 6.53
97.6 88.8 79.6
50.7 65.9 78.0
7.55 7.48 7.36
93.2 84.5 75.4
49.3 64.2 75.3
8.46 8.37 8.27
88.3 80.0 71.9
47.5 62.6 71.8
9.43 9.34 9.24
3000/0.09
67 62 72
109.1 98.7 124.8
71.7 86.3 62.2
5.88 5.81 5.96
105.4 94.8 121.4
70.5 85.1 61.3
6.74 6.67 6.85
101.2 90.6 117.2
68.9 82.9 60.0
7.68 7.59 7.80
96.7 85.9 112.1
67.4 81.2 58.4
8.70 8.61 8.82
91.8 81.5 106.7
65.7 79.5 56.6
9.79 9.72 9.90
86.8 76.0 101.3
63.9 76.0 54.8
10.96 10.81 11.11
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
t = t –
ldb edb
t = wet-bulb temperature corresponding to enthalpy of air
lwb
leaving indoor coil (h
h = h
lwb ewb
Where h
ewb
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).
20
3750/0.14
72 67 62
110.3 101.9 93.8
58.0 76.6 92.2
5.20 5.13 5.07
107.7 99.0 90.6
57.3 75.9 90.0
5.93 5.86 5.78
103.8 95.3 87.4
56.2 74.9 87.3
6.72 6.64 6.57
100.0 91.0 84.1
55.3 73.6 84.1
7.59 7.50 7.41
95.6 86.6 80.7
54.2 72.1 80.7
8.52 8.42 8.34
90.0 81.9 77.2
52.1 70.1 77.2
9.47 9.38 9.32
3400/0.11
67 62 72
110.7 100.2 126.3
75.8 92.8 67.8
5.89 5.83 5.99
106.9 96.1 124.0
74.5 90.5 66.2
6.76 6.67 6.88
102.6 91.7 120.1
73.0 88.6 65.0
7.69 7.58 7.84
97.9 87.6 114.9
71.4 86.6 63.5
8.71 8.62 8.86
93.1 83.3 109.2
69.5 83.1 61.5
9.79 9.71 9.95
87.9 78.7 102.9
67.9 78.7 59.1
10.99 10.88 11.14
sensible heat capacity (Btuh)
1.10 x cfm
)
lwb
total capacity (Btuh)
–
4.5 x cfm
= Enthalpy of air entering indoor coil.
4250/0.13
67 62
112.8 103.4
83.3 101.2
5.91 5.85
109.1 98.7
82.9 98.5
6.79 6.71
104.8 94.5
81.5 94.5
7.74 7.66
99.9 90.5
79.5 90.5
8.75 8.67
94.9 86.3
77.8 86.3
9.84 9.75
89.5 81.9
75.7 81.9
11.03 10.93