Catalogue
14 UH-PRC001-EN
Selection Procedure
Note:
To determine the Btu per hour capacity of a Model P projection unit heater at any steam pressure and entering air temperature, multiply rated capacity at
2 psig steam 60 F entering air (Table 8) by factor from Table 3. Factors in italics: Units should not be operated when entering air is below freezing at steam
pressures below 10 psig.
Table 3. Factors For Determining Steam Capacity Of Model P Projection Unit Heaters At Various Pressures And Temperatures
(Table based on 2 PSIG and 60 F Entering Air)
Steam Pressure PSIG Temperature of Entering Air (F)
-10 0 10 20 30 40 50 60 70 80 90 100
Draw-Through Unit
0 1.49 1.41 1.33 1.25 1.18 1.11 1.03 0.96 0.90 0.83 0.76 0.69
2 1.52 1.45 1.37 1.29 1.22 1.15 1.07 1.00 0.93 0.86 0.80 0.73
5 1.58 1.50 1.42 1.34 1.27 1.20 1.12 1.05 0.98 0.91 0.85 0.78
10 1.64 1.57 1.49 1.41 1.34 1.27 1.19 1.12 1.05 0.98 0.91 0.85
15 1.70 1.62 1.55 1.47 1.40 1.32 1.25 1.18 1.11 1.04 0.97 0.90
20 1.75 1.67 1.60 1.52 1.45 1.37 1.30 1.23 1.16 1.09 1.02 0.96
30 1.83 1.75 1.68 1.61 1.53 1.46 1.39 1.32 1.25 1.18 1.11 1.04
40 1.90 1.82 1.75 1.68 1.61 1.53 1.46 1.39 1.32 1.25 1.18 1.11
50 1.96 1.87 1.81 1.74 1.67 1.59 1.52 1.45 1.38 1.31 1.24 1.17
60 2.02 1.94 1.87 1.79 1.72 1.64 1.57 1.50 1.43 1.36 1.29 1.22
70 2.07 1.99 1.92 1.84 1.76 1.69 1.62 1.55 1.47 1.40 1.33 1.27
75 2.10 2.02 1.94 1.86 1.79 1.71 1.64 1.57 1.49 1.42 1.36 1.29
Table 4. Maximum Mounting Heights in Feet for Model P Unit Heaters with and without Louver Cone Diffuser
Unit
Size
Steam Pressure (PSI)
2 5 10 50 75
42-P 10.5
12.5
10.0
12.0
10.0
12.0
9.0
11.0
8.0
10.0
42-P LS* 8.0
9.0
8.0
8.5
8.0
8.5
8.0
8.0
8.0
8.0
42-P-L** 12.5
14.5
12.0
14.0
12.0
13.5
10.5
12.0
9.5
11.5
42-P-L LS 9.0
10.5
8.5
10.0
8.5
10.0
8.0
9.0
8.0
8.5
64-P 12.0
14.5
11.5
14.0
11.5
14.0
10.0
12.0
9.5
11.5
64-P LS 9. 5
11.5
9.0
11.0
9.0
11.0
8.0
9.5
8.0
9.0
64-P-L 15.0
19.0
14.5
18.5
14.5
18.5
12.5
16.5
12.0
16.0
64-P-L LS 11.5
14.0
11.0
13.5
11.0
13.5
9.5
12.0
8.0
11.5
80-P 15.0
18.5
14.5
18.0
14.0
17.5
12.0
15.5
11.5
13.5
80-P LS 11.0
13.5
10.5
13.0
10.5
13.0
9.0
11.5
8.5
11.0
80-P-L 18.0
22.0
17.5
21.0
17.5
21.0
15.0
19.0
14.0
18.0
80-P-L LS 13.0
17.0
12.5
16.5
12.0
16.0
11.0
14.0
10.5
13.5
102-P 14.0
17.0
13.5
16.5
13.0
16.0
11.5
14.0
11.0
13.5
102-P LS 11.0
13.5
10.5
13.0
10.5
13.0
9.5
12.0
9.0
11.5
102-P-L 17.5
21.5
17.0
21.0
16.5
20.5
15.0
18.5
14.5
17.5