COOLING CAPACITIES (cont)
50ZH048 (4 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
1400/0.08 1600/0.08 1800/0.09
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85
TC 57.4 52.5 43.8 41.2 57.7 53.0 44.4 42.6 58.2 53.7 45.0 44.5
SHC 27.1 34.7 31.7 40.1 27.8 36.9 33.7 42.4 29.0 38.6 35.7 44.5
kW 3.63 3.60 4.39 4.26 3.72 3.70 4.50 4.38 3.84 3.78 4.59 4.51
95
TC 55.1 50.0 41.3 39.3 55.5 46.0 41.9 40.6 56.0 51.2 42.3 42.2
SHC 26.4 33.7 30.7 38.6 27.2 36.0 32.8 40.5 28.3 37.8 34.7 42.2
kW 4.06 4.02 4.82 4.75 4.15 4.12 4.93 4.87 4.26 4.21 5.03 4.99
105
TC 52.8 47.4 38.6 37.4 53.4 48.1 39.0 38.6 53.8 48.7 39.5 39.8
SHC 25.6 32.8 29.6 37.0 26.7 35.0 31.6 38.5 27.7 37.0 33.5 39.8
kW 4.49 4.44 5.25 5.24 4.59 4.54 5.36 5.36 4.68 4.63 5.47 5.48
115
TC 42.0 38.0 36.1 48.4 42.6 38.3 36.4 49.4 43.1 38.7 36.7 50.9
SHC 37.7 31.1 28.1 46.4 40.5 33.5 30.5 49.4 42.9 35.7 32.5 50.9
kW 4.61 5.79 5.73 5.81 4.71 5.89 5.84 5.94 4.81 6.00 5.94 6.08
50ZH060 (5 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
1800/0.04 2000/0.05 2250/0.06
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85
TC 65.7 59.9 55.5 54.4 66.4 60.8 56.5 55.7 67.3 61.7 57.4 57.4
SHC 33.7 43.4 50.8 52.5 35.2 46.5 54.4 55.7 36.8 49.4 57.3 57.4
kW 5.55 5.45 5.35 5.33 5.67 5.58 5.48 5.47 5.82 5.71 5.61 5.62
95
TC 63.1 55.0 52.8 51.8 64.1 58.1 53.7 53.5 64.7 58.8 55.3 55.0
SHC 32.9 41.9 49.6 51.1 34.5 45.4 53.1 53.4 36.3 48.3 55.2 55.0
kW 5.94 5.85 5.74 5.72 6.08 5.98 5.87 5.88 6.21 6.09 6.02 6.03
105
TC 60.2 53.6 49.9 49.3 61.0 54.9 51.2 51.1 61.7 55.7 52.7 52.6
SHC 31.9 40.8 48.3 49.3 33.6 44.3 51.1 51.1 35.3 47.2 52.7 52.6
kW 6.37 6.28 6.18 6.16 6.50 6.40 6.32 6.33 6.64 6.52 6.47 6.48
115
TC 57.3 51.2 47.1 46.7 58.0 51.8 48.7 48.7 58.6 52.6 50.1 50.2
SHC 30.9 40.1 47.0 46.7 32.7 43.1 48.7 48.7 34.3 46.1 50.1 50.1
kW 6.80 6.71 6.61 6.60 6.92 6.83 6.77 6.78 7.07 6.95 6.92 6.93
LEGEND
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
Ldb — Leaving Dry-Bulb
Lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Net
TC — Total Capacity (1000 Btuh) Net
*At 75 F entering dry bulb (Tennessee Valley Authority [TVA] rating
conditions); all others at 80 F entering dry bulb.
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
t
ldb
=t
edb
–
1.10 x cfm
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (h
lwb
)
total capacity (Btuh)
h
lwb
=h
ewb
–
4.5 x cfm
Where: h
ewb
= Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering evapo-
rator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
11
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