2-9. OPERATING PROCEDURES - cont
Adjust Chemical Feed Pump. Refer to figure 2-56.
To prevent damage to chemical feed pump, do not turn control knobs past 10.
Turn all four chemical feed pump control knobs to 10.
If pump fails to prime, there may particles of dirt in the suction or discharge valves. Check Section II,
Chapter 3, Troubleshooting.
With the chemical feed pump control knobs set at 10 and RUN/PRIME valves set to PRIME, allow chemical
pump to operate until solution flow has been established in all chemical feed hoses.
When solution flow has been established, adjust POLYMER flow as follows:
Control knob settings identified in the following procedure are for reference only. Chemical flow must be
measured and the control knob setting adjusted as required until correct flow is obtained.
For noticeably turbid (dirty or murky) source water, set POLYMER control knob on chemical feed
pump to 2. For slightly turbid or clear source water, set POLYMER control knob to 1.
Locate the 100-ml graduated plastic cylinder out of Storage chest No. 3.
With the chemical feed pump operating, disconnect return hose (male connector) from
POLYMER chemical can coupling (female) and direct solution flow into 100 ml cylinder for 1
After one minute, remove the POLYMER hose from the cylinder and measure the amount of
POLYMER in the cylinder.
If POLYMER control knob was set to 2 for turbid water, POLYMER flow should be about 60
ml/min. If POLYMER control knob was set to 1 for clear water, flow should be at least 20
If flow rate is too high, turn control knob clockwise to reduce flow. If flow rate is too low, turn
control knob counterclockwise to increase flow.
Repeat steps (c) through (f) until flow rate is correct.
Reconnect POLYMER return hose to POLYMER chemical can.
Record setting of POLYMER control knob for future reference.