86
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).
549C060 (5 Tons)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
1500/0.05 1750/.05 2000/.07 2500/.08
Indoor Entering Air — Ewb (F)
57 62 67 72 57 62 67 72 57 62 67 72 57 62 67 72
75
TC 56.2 59.2 65 70.3 59.5 61.3 66.9 71.5 62.2 62.9 68.2 72.9 66.1 66.1 70 74.1
SHC 54 49.5 41.1 32.3 57.1 54.2 44.4 33.8 59.8 58.4 47.4 35.6 63.5 63.5 53.3 38.4
kW 3.17 3.19 3.19 3.22 3.18 3.18 3.2 3.23 3.19 3.19 3.21 3.24 3.2 3.2 3.22 3.25
85
TC 53.3 56 62.6 68.5 57.2 58.4 64.5 69.9 59.9 60.1 66 70.9 64.1 64.1 67.8 72.6
SHC 51.2 48.3 40.4 31.8 55 53.1 43.8 33.6 57.6 57.2 47.1 35.3 61.6 61.6 53.2 38.6
kW 3.59 3.6 3.62 3.64 3.61 3.61 3.63 3.65 3.61 3.61 3.63 3.66 3.62 3.62 3.64 3.67
95
TC 49.1 50.5 59.4 65.8 53.6 53.7 61.3 67.7 56.8 56.8 62.7 68.7 61.5 61.5 64.8 70.5
SHC 47.1 46.1 39.3 30.9 51.6 51.1 42.7 33.1 54.7 54.6 46.1 34.8 59.1 59.1 52.6 38.6
kW 4.02 4.03 4.08 4.1 4.05 4.05 4.09 4.12 4.08 4.07 4.1 4.12 4.09 4.09 4.11 4.14
105
TC 44.7 44.6 52.9 62.4 48.8 48.9 55.4 64.2 51.5 51.5 58 65.6 57.8 57.8 60.8 67.3
SHC 42.9 42.9 37 29.9 46.9 47 40.8 32.1 49.5 49.5 44.6 34.1 55.6 55.6 51.5 37.9
kW 4.49 4.49 4.56 4.61 4.53 4.53 4.58 4.63 4.55 4.55 4.6 4.64 4.6 4.6 4.62 4.64
115
TC 39.9 40 45.2 56.4 43.9 43.9 47.2 59.5 46 46.2 49.8 61.4 52 51.9 52.6 63.3
SHC 38.4 38.4 34.3 28.1 42.2 42.2 38 30.7 44.3 44.4 41.9 33 50 50 48.8 37.1
kW 4.98 4.98 5.06 5.16 5.05 5.05 5.08 5.18 5.07 5.07 5.11 5.2 5.13 5.13 5.13 5.21
125
TC 35.9 35.9 38.4 49 38.6 38.5 39.7 50.9 41.1 41 41.3 52.8 45.1 45.2 45.3 55.6
SHC 34.5 34.5 32.1 25.8 37.1 37.1 35.5 28.1 39.5 39.5 39 30.5 43.4 43.5 43.6 35
kW 5.53 5.53 5.57 5.7 5.58 5.58 5.59 5.72 5.62 5.62 5.62 5.74 5.68 5.67 5.68 5.77
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
