Trane UHSB Installation, Operation And Maintenance Manual page 29

Technical Data: P Model
The performance data listed in
Table 13, Table 14, and Table 15
include sound ratings. The ratings
provide a guide in determining the
acceptable degree of loudness in
particular occupancy situations.
Certain general rules apply to specific
selection of unit heaters with regard
to degree of quietness (or loudness);
• The greater the fan diameter, the
higher the sound level.
• The higher the motor RPM, the
higher the sound level. Note that
on most units the lower the
speed mode results in lowering
the sound rating one increment.
• Selecting a larger number of
smaller units generally results in
lower overall noise levels than
fewer large units.
All vertical steam and hot water unit
heater motors, whether fan guard or
shelf-mounted, are isolated from the
mechanical mount by resilient
isolators. This mounting along with
balanced fan blades and excellent
overall construction integrity, assures
you the utmost in quiet operation.
The following table outlines sound
ratings for various applications. The
lower the number, the quieter the
unit and the lower the sound
requirement.
UH-SVX01A-EN
Technical Data
Category of Area
apartment, assembly hall, classrooms, churches, courtrooms, executive
offices, hospitals, libraries, museums, theatres
dining rooms, general offices, recreation areas, small retail stores
restaurants, banks, cafeterias, department stores, public buildings,
service stations
gymnasiums, health clubs, laundromats, supermarkets
garages, small machine shops, light manufacturing
factories, foundries, steel mills
* Depending on specific use in these facilities,
size of operation, etc.
Table 14. Corrections When Using Glycol Solution in System
Heat transfer @ 180°F with no
increase inflow rate
G.P.M. Req'd. @ 180°F, 20°F Δ t (no
correction to pump curve)
Pump Head Req'd. @ 180°F w/
increase in G.P.M.
Specify gravity (water = 1.0)
Pounds/Gallons @ 60°F (water =
8.3453 Pound/Gallon)
pH @ 50% by volume
Freezing Point by volume
*Compared to water.
Table 15. Approximate factors at varying altitudes
Altitude
Sea level - 1000 ft.
1000 ft. - 3000 ft.
3000 ft. - 5000 ft.
5000 ft. - 7000 ft.
7000 ft. - 10000 ft.
Propylene
Glycol
20% solution .97*
50% solution .90*
1.10%*
1.23%*
1.045-1.055*
8.77
9.5
55% -
50% -28°F
40% -13°F
30% + 4°F
20% +17°F
Factor
1.00
.958
.929
.900
.871
Sound Rating
I
II
III
IV
V
III-VII*
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