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11FIN-PRC004-EN
Example
A 12S enclosure is to be installed 6”
above the recommended installed
height. Compute the new capacity rating:
Wall Fin Correction Factors Selection
1
Actual installed height is 19
7
/32” (13
7
/32”
from Table PD-8 + 6” (152 mm) ).
Interpolating from Table S-5, the heating
effect factor is 1.065.
2
Recommended installed height is 13
7
/32
(from Table PD-8). From Table S-5, the
heating effect is 1.075.
3
Actual capacity = rated capacity
(Table PD-8) x 1.065
1.075
Rating Adjustment for Greater Than
Cataloged Installed Height-Heating
Effect
Ratings in Tables PD-1 through PD-25
include the factor shown in Table S-5 for
installed heights recommended.
Installed height defines the installed
location that is the basis for the
published rating and determines the
percentage which may be added to
condensation capacity. If the unit is
installed at a different height than
recommended, the following
computation applies:
Capacity at actual installed height =
(Table S-5 factor for
actual installed height)
Rated Capacity x
(Table S-5 factor for
recom. installed height)
Selection
Procedure
Determining Pressure Drop
(Refer To Chart S-1)
One-Row Units
— Read pressure drop
per 100 feet (30.5 m) on one row
assembly below the water velocity.
Two-Row Units, Serpentined (piped in
series)
— All water passes through both
rows, so pressure drop per 100 feet (30.5
m) of assembly is twice the pressure
drop below the water velocity.
Two-Row Units, Headered (piped in
parallel)
— Half the water flows through
each row. The actual water velocity in
each row is one-half the water velocity.
The water velocity correction factor
appears below the actual water velocity.
Pressure drop will be the same for each
row, so the drop per 100 (30.5 m) feet of
assembly appears below the actual
water velocity.
Table S-5 — Heating Effect Factors for Greater Than Cataloged Installed Heights
Installed Heights (Inches)
19” 20” 21” 22” 23” 24” 25” 26” 27” 28” 29” 30” 32” 34” 36” or More
18” Or Less 483 508 533 559 584 610 635 660 686 711 737 762 813 864 914
Type Enclosure 457 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm
Bare Element 1.15 1.14 1.13 1.12 1.11 1.10 1.09 1.08 1.07 1.06 1.05 1.04 1.03 1.02 1.01 1.00
S 1.075 1.07 1.065 1.06 1.055 1.05 1.045 1.04 1.035 1.03 1.025 1.02 1.015 1.01 1.005 1.00
F 1.15 1.14 1.3 1.12 1.11 1.10 1.09 1.08 1.07 1.06 1.05 1.04 1.03 1.02 1.01 1.00
T, TA, E 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Installed height is vertical distance from floor to top of upper element for bare element; top of outlet grille for Type F enclosure; center of outlet grille for Type S enclosure; and
underside of the outlet grille for Type T, TA or E unit.