Product Overview

Page ___________ of ______________
Form C-HU - Page 4

Use the following two tables to determine
1. Heating Capacity (MBH)
2. Leaving Air Temperature (LAT)
3. Water Flow in Gallons per Minute (GPM)
4. Water Pressure Drop (WPD) in feet of water
The performances reected in these tables are based on the follow-
ing:
● Entering Water Temperature (EWT): 200°F (93°C)
● Water Temperature Drop (WTD): 20° (11°C)
● Entering Air Temperature (EAT): 60° (16°C)
TABLE C - Hot Water Correction Factors for EAT and EWT different from cataloged information
ENGINEERING DATA
HOT WATER CAPACITIES, CALCULATIONS AND CORRECTION FACTORS
TABLE D - Hot Water Correction Factors for WTD different from cataloged information
TABLE E - Hot Water Conversion Factors for Water Flow different from cataloged information
TABLE A - Low Speed Fan Setting
TABLE B - High Speed Fan Setting
*Calculate % of Water Flow by dividing actual water ow in GPM by the “cataloged” water ow.
Size
Approx. Fan
rpm
MBH
Output
Leaving
Air Temp.
(LAT)
Water Flow
WPD
feet of water
Air Volume
Gal. per
Minute
Liters per
Minute°F °C cfm (m
3
/hr)
18/24 1,100 13 104° 40° 1.31 4.96 0.06 270 459
23/33 1,100 17 107° 42° 1.72 6.49 0.01 330 561
44/62 1,100 32 113° 45° 3.23 12.22 0.08 560 952
60/85 1,100 45 112° 44° 4.54 17.18 0.23 800 1,359
78/110 1,100 58 109° 43° 5.85 22.15 0.48 1,100 1,869
96/120 850 72 115° 46° 7.26 27.49 0.95 1,200 2,039
140/175 850 105 115° 46° 10.59 40.09 1.90 1,750 2,973
190/238 850 141 119° 48° 14.22 53.84 4.50 2,200 3,738
300/350 850 230 116° 47° 23.20 87.82 3.30 3,800 6,457
Size
Approx. Fan
rpm
MBH
Output
Leaving
Air Temp.
(LAT)
Water Flow
WPD
feet of water
Air Volume
Gal. per
Minute
Liters per
Minute°F °C cfm (m
3
/hr)
18/24 1,550 19 104° 40° 1.92 7.27 0.11 400 680
23/33 1,600 24 104° 40° 2.42 9.16 0.04 500 850
44/62 1,600 45 108° 42° 4.54 17.18 0.15 860 1,461
60/85 1,600 64 107° 42° 6.46 24.45 0.45 1,250 2,124
78/110 1,600 82 106° 41° 8.27 31.30 0.95 1,650 2,804
96/120 1,080 89 113° 45° 8.98 33.99 1.30 1,550 2,634
140/175 1,080 131 112° 45° 13.22 50.04 2.80 2,300 3,908
190/238 1,080 177 117° 47° 17.86 67.60 7.00 2,850 4,842
300/350 1,080 276 114° 45° 27.84 105.37 4.80 4,750 8,071
Entering Air
Temperature
(EAT)
Entering Water temperature with 20° Temperature Drop
100 120 140 160 180 200 220 240 260 280 300
30°F -1°C 0.462 0.615 0.769 0.923 1.077 1.231 1.385 1.538 1.692 1.846 2.000
40°F 4°C 0.385 0.538 0.692 0.846 1.000 1.154 1.308 1.462 1.615 1.769 1.923
50°F 10°C 0.308 0.462 0.615 0.769 0.923 1.077 1.231 1.385 1.538 1.692 1.846
60°F 16°C 0.231 0.385 0.538 0.692 0.846 1.000 1.154 1.308 1.462 1.615 1.769
70°F 21°C 0.154 0.308 0.462 0.615 0.769 0.923 1.077 1.231 1.385 1.538 1.692
80°F 27°C 0.077 0.231 0.385 0.538 0.692 0.846 1.000 1.154 1.308 1.462 1.615
90°F 32°C 0.000 0.154 0.308 0.462 0.615 0.769 0.923 1.077 1.231 1.385 1.538
100°F 38°C 0.000 0.077 0.231 0.385 0.538 0.692 0.846 1.000 1.154 1.308 1.462
Water Temp. Drop 5°F 10°F 15°F 20°F 25°F 30°F 35°F 40°F 45°F 50°F 55°F 60°F
MBH Correction Factor 1.25 1.15 1.08 1.00 0.95 0.89 0.87 0.84 0.80 0.78 0.74 0.73
GPM Correction Factor 5.00 2.30 1.44 1.00 0.74 0.59 0.49 0.40 0.35 0.30 0.27 0.24
% Water Flow* 25% 50% 75% 100% 125% 150% 175%
MBH Correction Factor 0.80 0.89 0.96 1.00 1.04 1.07 1.10