Unit Start Up
114 RT-SVX36K-EN
Figure 76. Supply fan performance with variable frequency drive - 70 and 75 ton air-cooled, 80 and 89 ton evaporative
condensing - direct drive plenum, 120% width
1900 RPM
1800 RPM
1700 RPM
1600 RPM
1500 RPM
1400 RPM
1300 RPM
1200 RPM
1100 RPM
1000 RPM
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
0 2500 5000 7500 10000 12500 15000 17500 20000 22500 25000 27500 30000
Stac Pressure, Inches w.c.
Airflow, CFM
S_HL*70 & 75/89 Ton
Dual 27” 120% Width
DDP Fan
Entrance Losses
- without Evap Coil
- without Filters
- without Return Air Dampers
- without Exhaust Fan
Fan Curve Limits
- Minimum Total Motor HP = 10 (2x5HP)
- Maximum Total Motor HP = 50 (2x25HP)
- Maximum Fan RPM = 1900
- Maximum CFM = 27,000
- Maximum Static Pressure Leaving the
unit = 4.0” w.c.
Figure 77. Supply fan performance with or without variable frequency drive - 90 ton air-cooled