Unit Start Up
RT-SVX36K-EN 109
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Figure 66. Supply fan performance with or without variable frequency drive - 40, 50 and 55 ton air-cooled, 48 and 59 ton
evaporative condensing - forward curved
90%
900 RPM
800 RPM
700 RPM
600 RPM
500 RPM
70%
80%
1000 RPM
1100 RPM
1200 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 22000 24000 26000
Stac Pressure, Inches w.c.
Airflow, CFM
S_HL* 40 & 50, 55, 48 & 59 Ton
Dual 20 X 20 Fans
Entrance Losses
- without Evap Coil
- without Filters
- without Return Air Dampers
- without Exhaust
Fan Curve Limits
- Minimum Motor HP = 7.5
- Maximum Motor HP = 30
- Maximum Fan RPM
7.5 - 15 HP = 1141
20 - 30 HP = 1170
- Maximum CFM
40/48 = 18,000
50/59, 55 = 22,500
- Maximum Static Pressure
Leaving the Unit = 4.0" w.c.
Figure 67. Supply fan performance with variable frequency drive - 40 ton air-cooled, 48 ton evaporative condensing -
direct drive plenum, 80% width
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 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
Stac Pressure, Inches w.c.
Airflow, CFM
S_HL*40/48 Ton
Single 27” 80% 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 = 2000
- Maximum CFM = 18,000
- Maximum Static Pressure
Leaving the unit = 4.0” w.c.