Instruction manual

Time Based means that the bleed solenoid will open for a programmed amount of time prior to the

Biocide 1 addition. The conductivity of the system after the pre-bleed will depend upon the

starting conductivity, and the flow rate of the bleed line.

Cond Based means that the bleed valve will open until the conductivity of the system drops to the

programmed level. This will delay the biocide add for an unknown amount of time, which will

vary with the starting conductivity and the bleed flow rate.

Biocide 2 Feed Mode

This menu is the same as Biocide 1 above, except for Biocide 2 additions.

Biocide 2 Pre-Bleed Mode

This menu is the same as described for Biocide 1 above.

Dispersant Feed Mode

Click on the radio button that matches when you would like to feed your dispersant, penetrant or

surfactant relative to the Biocide additions.

Not Used

Prior to Bio 1

Prior to Bio2

After Bio 1

After Bio2

Prior to Bio 1 & 2

After Bio 1 & 2

Flow Switch

Click on the radio button that describes what you want to do.

Enabled means that the if the flow of sample past the flow switch stops, then the controller will

stop control based on the sensor signals. This is the normal method of operation.

Disabled can be used to ignore the flow switch and control regardless of whether the sample is

stagnant or not. This is not recommended unless the flow switch is defective and you know that

flow is not going to stop before you have a chance to repair the flow switch.

Control Directions

Click on the radio button for each sensor type to set which direction the controller will correct

them.

Direction of Conductivity Control. Most systems will tend to rise in conductivity as water is

evaporated from the cooling tower, so you would normally select “Force Lower”.

Direction of pH Control. If you plan on adding an acid to lower the pH, select “Force Lower”. If

you plan on adding caustic to raise the pH, select “Force Higher”.

Direction of ORP Control. The normal situation is to add chlorine, bromine or other oxidizer to

increase the ORP. In this case, select “Force Higher”.