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42BHC,BVC AIRFLOW CORRECTION FACTORS
NOTE: Use Sensible Heat correction factors when calculating heating
capacity.
DIRECT EXPANSION (DX) CORRECTION FACTORS
Consult factory for values outside of table.
DX Total Capacity (MBtuh) = Base Et x Total Correction Factor
DX Sensible Capacity (MBtuh) = Base Es x Sensible Correction Factor
% of Nominal Cfm = Actual Cfm (from Fan Performance table)
÷ Nominal Cfm
ALTITUDE COOLING CORRECTION FACTORS
42BHC,BVC HOT WATER CAPACITY CORRECTION FACTORS
NOTES:
1. Leaving air temperature not to exceed 104 F with standard motor.
2. Base capacity ratings based on 180 F entering water temperature
and 70 F entering air temperature.
3. Hot Water Heating Capacity (MBtuh) =Rated Heating Capacity x
Hot Water Capacity Correction Factor x Sensible Airflow Correc-
tion Factor.
CFM RATIO
(Actual/Base)
TOTAL (Ct) SENSIBLE (Cs)
1.40 1.25 1.26
1.35 1.22 1.23
1.30 1.19 1.20
1.25 1.16 1.17
1.20 1.13 1.14
1.15 1.10 1.11
1.10 1.07 1.08
1.05 1.04 1.04
1.00 1.00 1.00
0.95 0.97 0.97
0.90 0.94 0.93
0.85 0.90 0.89
0.80 0.86 0.85
0.75 0.82 0.81
0.70 0.78 0.77
0.65 0.74 0.72
0.60 0.70 0.67
0.55 0.66 0.62
0.50 0.62 0.57
0.45 0.58 0.52
0.40 0.53 0.47
0.35 0.48 0.42
0.30 0.43 0.38
0.25 0.38 0.33
%OF
NOMINAL CFM
CORRECTION FACTOR
Total Sensible
80 0.95 0.93
90 0.97 0.96
100 1.00 1.00
110 1.02 1.04
120 1.05 1.08
ELEVATION (ft) TOTAL HEAT (Et) SENSIBLE HEAT (Es)
1000 0.99 0.96
2000 0.98 0.93
3000 0.97 0.89
4000 0.96 0.86
5000 0.94 0.83
6000 0.93 0.80
7000 0.92 0.77
8000 0.91 0.75
9000 0.90 0.73
ENTERING AIR
TEMPERATURE (F)
ENTERING WATER TEMPERATURE (F)
100 110 120 130 140 150 160 170 180 190 200
50 0.455 0.545 0.636 0.727 0.818 0.909 1.000 1.091 1.182 1.273 1.364
55 0.409 0.500 0.591 0.682 0.773 0.864 0.955 1.045 1.136 1.227 1.318
60 0.363 0.455 0.545 0.636 0.727 0.818 0.909 1.000 1.091 1.182 1.273
65 0.318 0.409 0.500 0.591 0.682 0.773 0.864 0.955 1.045 1.136 1.227
70 0.272 0.363 0.455 0.545 0.636 0.727 0.818 0.909 1.000 1.091 1.182
75 0.227 0.318 0.409 0.500 0.591 0.682 0.773 0.864 0.955 1.045 1.136
80 0.182 0.272 0.363 0.455 0.545 0.636 0.727 0.818 0.909 1.000 1.091
Performance data