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Table SP-2 – Factors for Determining Steam Capacity of Model S Horizontal Unit Heaters at Various Pressures and Temperatures
Table Based on 2 PSIG and 60 F Entering Air
Steam Temperature of Entering Air (F)
Pressure PSIG -10 0 10 20 30 40 50 60 70 80 90 100
0
1.54 1.45 1.37 1.27 1.19
1.11 1.03 0.96 0.88 0.81 0.74 0.67
2
1.59 1.50 1.41 1.32 1.24
1.16 1.08 1.00 0.93 0.85 0.78 0.71
5
1.64 1.55 1.46 1.37 1.29
1.21 1.13 1.05 0.97 0.90 0.83 0.76
Blow- 10
1.73 1.64 1.55 1.46 1.38
1.29 1.21 1.13 1.06 0.98 0.91 0.84
Through 15 1.80 1.71 1.61 1.53 1.44 1.34 1.28 1.19 1.12 1.04 0.97 0.90
Type 20 1.86 1.77 1.68 1.58 1.50 1.42 1.33 1.25 1.17 1.10 1.02 0.95
30 1.97 1.87 1.78 1.68 1.60 1.51 1.43 1.35 1.27 1.19 1.12 1.04
40 2.06 1.96 1.86 1.77 1.68 1.60 1.51 1.43 1.35 1.27 1.19 1.12
50 2.13 2.04 1.94 1.85 1.76 1.67 1.58 1.50 1.42 1.34 1.26 1.19
60 2.20 2.09 2.00 1.90 1.81 1.73 1.64 1.56 1.47 1.39 1.31 1.24
70 2.26 2.16 2.06 1.96 1.87 1.78 1.70 1.61 1.53 1.45 1.37 1.29
75 2.28 2.18 2.09 1 .99 1.90 1.81 1.72 1.64 1.55 1.47 1.40 1.32
Notes:
To determine the Btu per hour capacity of a Model S Horizontal Unit Heater at any steam pressure and entering air temperature multiply rated capacity at 2 psig steam 60 F entering air (Table
SP-3) by factor from above table. Factors in italics: Units should not be operated when entering air is below freezing at steam pressures below 10 psig.
Model S
Maximum mounting heights for Model
S Unit Heaters are given in Table SP-1.
When equipped with standard Louver
Fin Diffusers the distance of throw may
be increased as much as 25% by “toeing-
in” the vertical blades.
Distance of throw
decreases in proportion to the amount of
deflection given the airstream to either
side of the heater.
Mounting the unit at or below maximum
mounting height will insure that heated
air reaches the living zone.
Model P
Maximum mounting heights for Model P
Unit Heaters are given in Table SP-10,
page 19. These distances are figured
from the floor line to the bottom plate of
the unit heater.
Where ceilings are unusually low, a
nearly horizontal flow of air can be
obtained by equipping these units with
Louver Cone Diffusers. The individually
adjustable blades of the Louver Cone
permit an infinite variety of adjustments
to meet any on-the-job problems. By
setting the blades vertically to straighten
the airstream, as much as 45% increase
in throw can be obtained.