Catalogue

16 UH-PRC001-EN
Selection Procedure
Additional Selection Data
Motor and Fan Speeds
Motor and fan speeds are selected to
provide efficient performance. The
solid-state speed control will provide
an infinite number of speeds
between the highest and the lowest
cataloged fan speeds. The speed
control is not calibrated in specific
fan speeds. For use on units with 115
volt/60 cycle/1 phase, 1/8 hp and
smaller standard motors only.
Standard and Bypass Units
Standard models meet most
requirements and are most
economical. Bypass units meet
conditions as mentioned above, and
are also used where low final
temperature is specified.
Table 5. Maximum Spread in Feet
Unit Size: P 42 64 80 102 122 146 166 202 252 280 336 384 500 600 720
Spread ft 15 17 20 24 26 27 28 32 35 37 45 50 54 57 60
25 and 50 Cycle Unit Heat
Capacities
Ta bl e 6 shows the Btu, cfm, and the
hp required on unit heaters when
operated on 25 or 50 cycle circuits.
The multipliers in Tabl e 6 may be
applied to standard 60 cycle unit
capacities to determine the capacities
of the same unit when operating on
25 or 50 cycle current. These
multipliers may be used on units
cataloged at 1050 to 1150 RPM.
For the smaller Trane Unit Heaters
cataloged at 1550 RPM, the capacity
data in the catalog may be applied to
either 25 or 50 cycle service.
Table 6. Factors for Determining Unit Heater Capacities at 25 or 50 Cycles
RPM Multiplier To Be Applied To 60-Cycle 1100 RPM Ratings
25 CY 50 CY BTU CFM HP
1425 1425 1.17 1.25 1.95
950 .87 .833 .572
710 710 .7 .623 .242