Figure 2-54. Chemical Feed Pump Start Switch
Ensure all four chemical feed control knobs are set to their maximum settings: 8.5.
With the control knobs set at maximum, allow chemical pump motor to run with valve set to PRIME until no
more air bubbles are seen in the solution flowing in the polymer tubes.
If pump fails to prime, there may be some particles in the suction or
discharge valves. Check Section II, Chapter 3, Troubleshooting.
When you cant see any more bubbles in either tube, calibrate the POLYMER flow as follows:
For noticeably turbid (dirty or murky) source water, set POLYMER control knob to 2.6. Otherwise, set
control knob to 1.0.
Use the 100-ml graduated plastic cylinder out of Storage Box No. 3.
While POLYMER pump is running, remove polymer return quick disconnect from the container and
catch flow for 1 minute.
If knob was set to 2.6, flow should be about 60 mI/min. Adjust knob to obtain correct flow. Record knob
setting for future reference.