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Unit Start Up

RT-SVX36K-EN 11 3

Figure 74. Supply fan performance with variable frequency drive - 60 ton air-cooled, 73 ton evaporative condensing -

direct drive plenum, 120% width

2100 RPM

2000 RPM

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

Stac Pressure, Inches w.c.

Airﬂow, CFM

S_HL*60/73 Ton

Dual 25” 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 = 40 (2x20HP)

- Maximum Fan RPM = 2100

- Maximum CFM = 27,000

- Maximum Static Pressure Leaving the

unit = 4.0” w.c.

Figure 75. Supply fan performance with variable frequency drive - 70 and 75 ton air-cooled, 80 and 89 ton evaporative

condensing - direct drive plenum, 80% width