Unit Start Up
110 RT-SVX36K-EN
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Figure 68. Supply fan performance with variable frequency drive - 40 ton air-cooled, 48 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 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
Stac Pressure, Inches w.c.
Airflow, CFM
S_HL*40/48 Ton
Single 27” 120% Width
DDP Fan
Entrance Losses
- without Evap Coil
- without Filters
- without Return Air Dampers
- without Exhaust Fan
Fan Curve Limits
- Minimum Motor HP = 3
- Maximum Motor HP = 25
- Maximum Fan RPM = 1900
- Maximum CFM = 18,000
- Maximum Static Pressure
Leaving the unit = 4.0” w.c.
Figure 69.
Supply fan performance with variable frequency drive - 50, 55 ton air-cooled,
59 ton evaporative condensing
-
direct drive plenum, 80% width
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
Stac Pressure, Inches w.c.
Airflow, CFM
S_HL*50/59 & 55 Ton
Single 30” 80% Width
DDP Fan
Entrance Losses
- without Evap Coil
- without Filters
- without Return Air Dampers
- without Exhaust Fan
Fan Curve Limits
- Minimum Motor HP = 30
- Maximum Motor HP = 30
- Maximum Fan RPM = 1800
- Maximum CFM = 22,500
- Maximum Static Pressure
Leaving the unit = 4.0” w.c.