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Unit Start-up
Figure 42. Supply fan performance with or without variable frequency drive - 20 and 25 tons air-cooled, - forward
curved
8.0
1700 RPM
7.5
7.0
1600 RPM
6.5
1500 RPM
6.0
5.5
1400 RPM
5.0
1300 RPM
4.5
4.0
1200 RPM
3.5
1100 RPM
3.0
1000 RPM
2.5
900 RPM
2.0
800 RPM
1.5
600 RPM
1.0
0.5
0.0
0
2000
Important: Maximum static pressure leaving the rooftop is
4.0" H
O positive. The static pressure drops
2
from the supply fan to the space cannot
exceed 4.0" H
68
4000
6000
Airflow, CFM
O.
2
8000
10000
Notes:
•
Fan performance for 20 and 25 tons rooftops is
identical. Contact your local Trane®
representative for information on oversized
motors.
•
Shaded areas represent selectable area.
Contact your local Trane® representative for
more information.
•
Supply fan performance curve includes internal
resistance of rooftop. For total static pressure
determination, system external static must be
added to appropriate component static
pressure drops (evaporator coil, filters, optional
economizer, optional relief fan, optional heating
system, optional cooling only extended casing,
optional roof curb).
•
Maximum Cfm (for cULus approval) as follows:
20 ton - 9,000 Cfm, 25 ton - 11,000 Cfm.
•
Minimum motor horsepower is 3 hp. Maximum
motor horsepower is 20 hp. Maximum fan RPM
is 1750.
90%
12000
RT-SVX072D-EN
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