FloAire INDIRECT FIRED BENT TUBE MODULE - Manual (Page 20)

20
Maximum RPM and HP Chart
Blower Size Maximum RPM Maximum HP
10” 1800 2
12” 1500 3
15” 1400 5
18” 1200 5
20” 1000 10
25” 900 20
Pulley Adjustment Illustration
Final Start-Up Procedure
1. With the air and burner systems in full operation and all ducts attached, measure the system
airflow. Motor sheave (pulley) is variable pitch, and allows for an increase or decrease of the fan
RPM to adjust the airflow, as shown in the illustration below. For your convenience, a RPM chart
is included in the following pages.
2. Once the proper airflow is achieved, measure and record the fan speed with a reliable
tachometer. Caution - Excessive speed will result in motor overloading or bearing failure.
Do not set fan RPMs higher than specified in the maximum RPM chart. See the
troubleshooting guide for more information.
3. Measure and record the voltage and amperage to the motor and compare with the motor
nameplate to determine if the motor is operating under safe load condition.
4. Once the rpm of the ventilator has been properly set, disconnect power and recheck belt tension
and pulley alignment as described below.