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Figure 53. Supply fan performance with variable frequency drive - 50, 55 tons, 40 ton gas heat - direct drive plenum,
120% width
8.0
7.5
1600 RPM
7.0
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
2.0
1.5
1.0
0.5
0.0
0
2500
5000
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
RT-SVX072D-EN
1700 RPM
7500
10000
12500
Airflow, CFM
O.
2
1800 RPM
15000
17500
20000
22500
Notes:
•
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:
50, 55 tons - 22,500 Cfm.
•
Minimum motor horsepower is 5 hp. Maximum
motor horsepower is 30 hp. Maximum fan RPM
is 1,700.
Unit Start-up
25000
27500
79
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