Figure 2-55. Control Knobs
When no more bubbles can be seen in SODIUM HEX and CHLORINE hoses, calibrate the flow as follows:
Set the SODIUM HEX control knob to 2.6.
Remove return quick disconnect from chemical container.
Catch chemical in 100 ml graduated cylinder (Storage Box No. 3)
Adjust control knob until you get 60 ml/min. flow and record setting for future reference.
Calibrate chlorine flow in same way.
Do NOT yet turn valves to RUN; leave them in PRIME position.
Leave CITRIC ACID control knob at maximum setting; no calibration is required for CITRIC ACID flow. Valve
remains in PRIME position throughout normal operation.
With both raw water pumps working, and the chemical feed pump running, set POLYMER pump valve from
PRIME to RUN. Set VENT MULTIMEDIA FILTER valve to CLOSE as soon as a full stream of water flows out of vent pipe
(located at bottom right-hand front of trailer, below R.O. pump belt guard).
There should be air venting out of the pipe as the multimedia filter fills,
followed by a steady stream of water when the filter is full. If not, the vent
line is probably blocked by a small piece of filter media. Remove vent
line from filter and blow compressed air through the line to dislodge the