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Unit Start-up
Figure 58. Supply fan performance with variable frequency drive - 60 ton gas heat, and all 70 and 75 tons cooling
only- direct drive plenum, 120% width
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
1200 RPM
3.0
1100 RPM
2.5
1000 RPM
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
84
1900 RPM
1800 RPM
1700 RPM
1600 RPM
1500 RPM
1400 RPM
1300 RPM
7500
10000
12500
15000
Airflow, CFM
O.
2
17500
20000
22500
25000
Notes:
•
Shaded areas represent selectable area.
Contact your local Trane® representative for
more information.
•
70-75 ton gas heat units use 30" DDP fans.
See
Figure 61, p.
•
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:
60 ton gas heat and 70, 75 tons - 27,000 Cfm.
•
Minimum motor horsepower is 10 hp (2 x 5 hp
motors). Maximum motor horsepower is 50 hp
(2 x 25 hp motors). Maximum fan RPM is 1,900.
27500
30000
87.
RT-SVX072D-EN
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