Catalogue

20 UH-PRC001-EN
Performance Data
Note: Ratings apply only to free inlet and discharge without diffusers.
Note: All motors are constant speed and operate at top speed as indicated in motor data. Models 42 through 102 can
be run at reduced speed with addition of optional variable speed switch. This switch is factory-calibrated for low
and high speed ratings, with intermediate speeds infinitely controllable. Models 166 through 720 operate at
constant speed as indicated in motor data.
Note: For specific motor data, refer to motor specifications at the end of this chapter.
Note: To correct for entering air temperatures, use 1° temperature rise for each foot in mounting height. As an
example, 60° air is required at work area (5 ft. above floor) units are to be mounted at (20 ft.) above floor.
Mounting height (20 ft.) minus work height (5 ft.) equals differential (15 ft.) or, 15° rise in air temperature at unit
air inlet. Correct for actual inlet air temperature of 75° (60° + 15° = 75° E.A.T.) on Tab l e 10
Table 11. STEAM CORRECTION FACTORS BASED ON 2 LBS. STEAM 60° E.A.T.
ENTERING
AIR TEMP
STEAM PRESSURE - LBS. PER SQ. IN. (SATURATED)
02510152030405075
30° 1.18 1.22 1.27 1.34 1.40 1.45 1.53 1.61 1.67 1.79
40° 1.11 1.15 1.20 1.27 1.32 1.37 1.46 1.53 1.59 1.71
50° 1.03 1.07 1.12 1.19 1.25 1.30 1.39 1.46 1.52 1.64
60° 0.96 1.00 1.05 1.12 1.18 1.23 1.32 1.39 1.45 1.57
70° 0.90 0.93 0.98 1.05 1.11 1.16 1.25 1.32 1.38 1.49
80° 0.83 0.86 0.91 0.98 1.04 1.09 1.18 1.25 1.31 1.42
90° 0.76 0.80 0.85 0.91 0.97 1.02 1.11 1.18 1.24 1.36
100° 0.69 0.73 0.78 0.85 0.90 0.96 1.04 1.11 1.17 1.29
Table 12. PROPERTIES OF SATURATED STEAM
STEAM PRESSURE IN LBS. PER SQUARE INCH GAUGE
02 5 10 15 20 30 40 50 75
Steam Temperature-°F 212.0 218.5 227.1 239.4 249.8 258.8 274.0 286.7 297.7 319.9
Latent Heat of Steam 970 966 961 953 946 940 929 920 912 891