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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
549B, 549C