28
Figure 16 - Pressure vs. Firing Rate
Final Start-up Procedure
1. With the air and burner systems in full operation and all ducts attached, measure the system airflow.
The motor sheave (pulley) is variable pitch and allows for an increase or decrease of the fan RPM. If
an adjustment is needed, refer to “Pulley Adjustment” on page 29.
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
RPM 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 wheel has been properly set, disconnect power and recheck belt tension and
pulley alignment, refer to Figure 18.
-1.00
0.00
1.00
2.00
3.00
4.00
5.00
6.00
0
100000 200000 300000 400000 500000
600000
Firing Rate (BTU/Hr/Ft. of Burner)
Manifold Pressure - Inches
Water Column (wc)
Average Manifold Pressure vs. Firing Rate/Ft. of Burner
Natural
Gas
Propane
Gas
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