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PERFORMANCE DATA (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 leaving
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..
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
INSTANTANEOUS AND INTEGRATED HEATING RATINGS
LEGEND NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the
effect of frost on the outdoor coil and the heat required to defrost it.
548F120 (10 TONS)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
2800/0.11 3750/0.16 4100/0.18 4700/0.21
Indoor Entering Air — Ewb (F)
72 67 62 72 67 62 72 67 62 72 67 62
75
TC
127.4 120.4 110.6 134.2 126.2 116.2 135.6 127.4 117.8 137.0 129.0 120.6
SHC
60.0 76.4 91.0 66.2 86.0 104.4 67.8 89.0 108.8 70.2 93.4 115.6
kW
8.30 8.18 7.88 8.54 8.34 8.04 8.60 8.36 8.10 8.64 8.38 8.20
85
TC
124.6 116.2 106.4 131.0 122.0 112.4 132.4 123.6 114.0 133.8 126.0 116.4
SHC
59.2 74.6 89.4 65.4 84.8 103.6 67.4 88.4 107.4 70.0 94.2 112.8
kW
9.24 9.04 8.74 9.50 9.24 8.98 9.54 9.28 9.02 9.60 9.36 9.08
95
TC
121.8 112.0 102.2 126.2 117.4 107.4 127.8 119.0 109.4 130.0 121.2 112.6
SHC
58.4 73.2 87.4 63.8 83.4 101.0 66.0 87.2 104.8 69.6 93.4 110.2
kW
10.34 10.04 9.66 10.46 10.18 9.90 10.52 10.26 9.96 10.62 10.36 10.08
105
TC
116.9 107.2 97.6 122.4 112.4 102.8 123.6 113.8 105.0 124.6 115.6 108.4
SHC
56.6 71.4 85.4 63.0 82.0 98.4 65.0 85.8 101.8 67.8 91.4 106.2
kW
11.38 11.08 10.66 11.64 11.28 10.90 11.68 11.32 11.00 11.68 11.38 11.16
115
TC
112.0 102.0 92.8 116.6 107.0 98.0 118.0 108.2 100.2 120.0 110.0 103.8
SHC
55.0 69.6 83.2 61.2 80.2 95.2 63.6 84.2 98.0 67.4 90.2 101.8
kW
12.58 12.18 11.74 12.78 11.42 12.00 12.84 12.48 12.12 12.96 12.56 12.30
125
TC
106.4 96.8 87.8 110.4 101.2 93.6 111.6 102.2 95.8 113.6 103.8 99.0
SHC
53.2 67.4 80.8 59.2 78.4 91.4 61.4 82.2 94.0 65.4 88.0 97.2
kW
13.84 13.36 12.90 13.96 13.62 13.22 14.02 13.68 13.34 14.14 13.76 13.54
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
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
548F036
Return
Air
(F db)
Cfm
(Standard
Air)
Air Temperature Entering Outdoor Coil (F)
0 10173040475060
55
900
Cap.
15.4
13.1 19.2 17.6 21.7 19.8 27.4 24.0 31.9 31.9 35.3 35.3 36.9 36.9 41.4 41.4
kW
2.25 2.44 2.57 2.86 3.10 3.29 3.38 3.64
1200
Cap.
15.9
13.5 19.4 17.8 22.5 20.5 28.3 24.8 32.9 32.9 35.8 35.8 37.0 37.0 40.1 40.1
kW
2.24 2.40 2.54 2.80 3.02 3.15 3.21 3.35
1500
Cap.
16.2
13.8 19.8 18.2 22.9 20.9 28.8 25.2 33.1 33.1 35.3 35.3 36.5 36.5 38.6 38.6
kW
2.23 2.38 2.52 2.76 2.94 3.03 3.08 3.17
70
900
Cap.
13.2
11.2 17.1 15.7 20.0 18.2 25.4 22.2 29.8 29.8 33.2 33.2 34.7 34.7 40.1 40.1
kW
2.29 2.50 2.67 2.98 3.24 3.45 3.55 3.91
1200
Cap.
13.7
11.6 17.7 16.3 20.3 18.5 26.3 23.1 30.8 30.8 34.4 34.4 36.0 36.0 40.9 40.9
kW
2.28 2.49 2.62 2.93 3.17 3.36 3.45 3.72
1500
Cap.
14.0
11.9 18.1 16.6 20.7 18.9 26.9 23.6 31.6 31.6 35.1 35.1 36.9 36.9 40.2 40.2
kW
2.27 2.47 2.60 2.89 3.12 3.30 3.38 3.54
80
900
Cap.
11.5
9.8 15.5 14.2 18.4 16.8 23.7 20.8 28.1 28.1 31.7 31.7 33.2 33.2 38.5 38.5
kW
2.30 2.54 2.71 3.04 3.32 3.55 3.65 4.03
1200
Cap.
12.0
10.2 16.2 14.8 19.2 17.5 24.7 21.6 29.3 29.3 33.0 33.0 34.5 34.5 40.2 40.2
kW
2.30 2.52 2.69 2.99 3.26 3.47 3.56 3.91
1500
Cap.
12.3
10.5 16.6 15.2 19.7 18.0 25.4 22.3 30.1 30.1 33.7 33.7 35.3 35.3 39.2 39.2
kW
2.29 2.51 2.68 2.97 3.22 3.41 3.50 3.70
Cap. —
Heating Capacity (1000 Btuh) (includes indoor-fan motor heat)
db —
dry bulb
kW —
Total Power Input (includes compressor motor power input,
outdoor-fan motor input, and indoor-fan motor input)
50TFQ004-012
548F036-120