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Bleed Set Point
The Bleed Set point has been pre-set at the factory to 1000µS/cm. Upon start-up and commissioning of the
cooling system the Bleed Set Point must be adjusted to the Evapco recommended set point for the specific
project. The Evapco set point recommendation is found on the project’s PPF1.0 report. Contact Evapco Water
Systems for a copy of the report if it is not available at the job site.
To adjust the set point value; select Outputs from the Main Menu. Scroll down the Outputs menu and select
Bleed (R5). Select the Tool icon. Select Setpoint. Using the keypad display enter desired set point. Select the
Confirm icon to save.
Bleed Deadband
The Deadband factory default setting is 50 µS/cm. To adjust the Deadband value; select Outputs from the Main
Menu. Scroll down the Outputs menu and select Bleed (R5). Select the Tool icon. Select Deadband. Using the
keypad display enter desired Deadband. Select the Confirm icon to save setting.
HOA
Selects the operating mode of the Bleed output; Hand (stays on for 10 minutes), Off (Stays off indefinitely),
Auto (Automatically operates Bleed output based on conductivity value). The Factory default setting for Bleed
output is Auto.
To change this setting for maintenance or troubleshooting; select Outputs from the Main Menu. Scroll down the
Outputs menu and Select Bleed (R5). Select the Tool icon. Select HOA Setting and make desired selection.
Select Return icon.
To prevent unintentional system water loss the Bleed valve has been assigned a Hand Time limit of 10 minutes.
When placed in Hand mode, the Bleed relay will remain powered for a maximum of 10 minutes. After 10
minutes the relay automatically de-energizes to close valve.
To change this setting, select Outputs from the Main Menu. Scroll down the Outputs menu and Select Bleed
(R5). Select the Tool icon. Select HOA Setting. Scroll down the Bleed menu and select Hand Time Limit.
Using the keypad enter desired time. Select the Confirm icon to save setting.
Once task requiring HOA selection to be changed from Auto has been completed return the setting to
Auto.
5.4.2 Biocide Timer and Alarm Relay (R6)
Output relay (R6) may be used to manage operation of ancillary equipment such as chemical metering pumps or
power a device (visual or audible, not included) to warn that an alarm condition exists.
Timer (R6)
The Timer relay is used to control the circuit shown in Figure 4. Up to 10 separate event settings may be
programmed. Timer operation is specific to local site requirements. Site specific programming should be
performed at the site.
