Specifications
18
PERFORMANCE DATA (cont)
COOLING CAPACITIES, STANDARD UNITS (cont)
Do not operate at these conditions.
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)
551B090 (7
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
2250/0.095 3000/0.110 3750/0.135
Temp (F) Air Entering Evaporator — Ewb
78 72 67 62 78 72 67 62 78 72 67 62
75
TC
111.9 105.5 96.9 87.6 113.3 107.3 99.6 90.7 114.7 110.3 101.9 93.8
SHC
35.4 50.6 63.6 75.7 35.9 53.3 69.2 83.7 38.8 58.0 76.6 92.2
kW
5.15 5.15 5.07 5.04 5.42 5.16 5.11 5.06 5.68 5.20 5.13 5.07
85
TC
108.8 102.5 93.6 83.6 111.9 105.1 96.5 87.5 114.1 107.7 99.0 90.6
SHC
34.4 49.7 62.4 73.9 35.3 52.8 68.4 82.2 35.7 57.3 75.9 90.0
kw
5.86 5.86 5.79 5.73 6.15 5.89 5.82 5.77 6.43 5.93 5.86 5.78
95
TC
107.4 98.9 90.1 79.3 109.3 101.6 92.9 83.5 110.8 103.8 95.3 87.4
SHC
34.0 48.5 61.2 71.9 34.3 51.9 67.2 80.2 34.9 56.2 74.9 87.3
kW
6.69 6.65 6.58 6.49 6.94 6.69 6.61 6.53 7.21 6.72 6.64 6.57
105
TC
103.4 95.3 86.2 75.7
97.6 88.8 79.6 100.0 91.0 84.1
SHC
32.6 47.3 59.6 70.2
50.7 65.9 78.0 55.3 73.6 84.1
kW
7.52 7.51 7.44 7.31 7.55 7.48 7.36 7.59 7.50 7.41
115
TC
91.0 82.0 71.6 93.2 84.5 75.4 95.6 86.6 80.7
SHC
45.9 58.0 68.1 49.3 64.2 75.3 54.2 72.1 80.7
kW
8.43 8.33 8.20 8.46 8.37 8.27 8.52 8.42 8.34
125
TC
86.2 77.8 68.1 88.3 80.0 71.9 90.0 81.9 77.2
SHC
44.1 56.4 66.3 47.5 62.6 71.8 52.1 70.1 77.2
kW
9.38 9.29 9.14 9.43 9.34 9.24 9.47 9.38 9.32
551B102 (8
1
/
2
TONS)
Temp (F)
Air Ent
Condenser
(Edb)
Temp (F) Air Entering Evaporator — Cfm/BF
2550/0.075 3000/0.09 3400/0.105 4250/0.125
Temp (F) Air Entering Evaporator — Ewb
78 72 67 62 78 72 67 62 78 72 67 62 78 72 67 62
75
TC
128.1 119.5 105.7 94.8 129.8 123.1 109.1 98.7 130.3 124.8 110.7 100.2 131.3 126.3 112.8 103.4
SHC
37.4 56.5 65.7 77.8 37.8 60.2 71.7 86.3 37.9 62.2 75.8 92.8 41.0 67.8 83.3 101.2
kW
5.92 5.92 5.84 5.77 6.11 5.95 5.88 5.81 6.24 5.96 5.89 5.83 6.56 5.99 5.91 5.85
85
TC
124.9 115.5 101.9 90.6 127.1 119.7 105.4 94.8 128.1 121.4 106.9 96.1 130.1 124.0 109.1 98.7
SHC
36.5 55.1 64.3 76.1 36.8 58.9 70.5 85.1 36.8 61.3 74.5 90.5 39.7 66.2 82.9 98.5
kW
6.78 6.77 6.69 6.61 6.99 6.83 6.74 6.67 7.13 6.85 6.76 6.67 7.46 6.88 6.79 6.71
95
TC
121.5 111.3 97.7 86.6 123.5 115.0 101.2 90.6 124.3 117.2 102.6 91.7
120.1 104.8 94.5
SHC
35.5 53.7 62.8 74.2 36.0 57.4 68.9 82.9 36.1 60.0 73.0 88.6
65.0 81.5 94.5
kW
7.75 7.71 7.62 7.52 7.96 7.76 7.68 7.59 8.09 7.80 7.69 7.58 7.84 7.74 7.66
105
TC
117.0 107.2 93.5 82.5
110.5 96.7 85.9 112.1 97.9 87.6 114.9 99.9 90.5
SHC
33.5 52.2 61.3 72.7 56.0 67.4 81.2 58.4 71.4 86.6 63.5 79.5 90.5
kW
8.78 8.75 8.64 8.54
8.80 8.70 8.61 8.82 8.71 8.62 8.86 8.75 8.67
115
TC
101.9 89.2 78.0 104.7 91.8 81.5 106.7 93.1 83.3 109.2 94.9 86.3
SHC
50.2 59.5 70.7 53.7 65.7 79.5 56.6 69.5 83.1 61.5 77.8 86.3
kW
8.80 9.73 9.64 9.86 9.79 9.72 9.90 9.79 9.71 9.95 9.84 9.75
125
TC
97.3 84.3 73.1 100.0 86.8 76.0 101.3 87.9 78.7 102.9 89.5 81.9
SHC
48.7 57.7 68.5 52.4 63.9 76.0 54.8 67.9 78.7 59.1 75.7 81.9
kW
11.03 10.90 10.70 11.08 10.96 10.81 11.11 10.99 10.88 11.14 11.03 10.93
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)
1.1 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