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—5—
CFM
— Cubic Ft per Minute
EWB
— Entering Wet Bulb (
°
F)
LWB
— Leaving Wet Bulb (
°
F)
TC
— Total Cooling Capacity 1000 Btuh
SHC
— Total Sensible Capacity 1000 Btuh
BF
— Bypass Factor
MBH
— 1000 Btuh
NOTES:
1. Contact manufacturer for cooling capacities at conditions other than
shown in table.
2. Formulas:
Leaving db = entering db —
Leaving wb = wb corresponding to enthalpy of air leaving coil (h
LWB
)
h
LWB
= h
EWB
—
where h
EWB
= enthalpy of air entering coil.
3. Direct interpolation is permissible. Do not extrapolate.
4. SHC is based on 80
°
F db temperature of air entering coil.
Below 80
°
F db, subtract (Correction Factor x CFM) from SHC.
Above 80
°
F db, add (Correction Factor x CFM) to SHC.
5. All data points are based on 10
°
F superheat leaving coil.
6. Bypass Factor = 0 indicates no psychometric solution. Use bypass
factor of next lower EWB for approximation.
Interpolation is permissible.
Correction Factor = 1.09 x (1 – BF) x (db – 80)
sensible heat cap.
1.09 x CFM
total capacity (Btuh)
4.5 x CFM
BYPASS
FACTOR
ENTERING AIR DRY BULB TEMPERATURE (
°
F)
79 78 77 76 75 Under 75
81 82 83 84 84 Over 85
Correction Factor
0.10
0.98 1.96 2.94 3.92 4.91
Use formula
shown below
0.20
0.87 1.74 2.62 3.49 4.36
0.30
0.76 1.53 2.29 3.05 3.82
COIL STATIC PRESSURE DROP (In. WC)
UNIT SIZE BULB AIR QUANTITY (CFM)
A024
600 700 800 900 — —
WET 0.08 0.10 0.13 0.16 — —
DRY 0.06 0.08 0.11 0.13 — —
A030
700 800 900 1000 1100 —
WET 0.08 0.12 0.15 0.19 0.23 —
DRY 0.08 0.10 0.14 0.17 0.21 —
A036
900 1000 1100 1200 1300 —
WET 0.16 0.19 0.23 0.27 0.32 —
DRY 0.13 0.17 0.21 0.25 0.29 —
A042
1000 1100 1200 1300 1400 —
WET 0.18 0.21 0.24 0.27 0.31 —
DRY 0.14 0.17 0.20 0.23 0.26 —
A048
1300 1400 1500 1600 1700 —
WET 0.19 0.22 0.25 0.28 0.31 —
DRY 0.18 0.21 0.24 0.27 0.30 —
A060
1600 1700 1800 1900 2000 2100
WET 0.19 0.22 0.24 0.26 0.28 0.30
DRY 0.18 0.20 0.21 0.24 0.26 0.28