Instruction manual

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then the bleed valve will open at 6.01 cycles and close at 5.90 cycles. The purpose of the dead
band is to prevent rapid chattering of the relay open and closed, which can shorten its life. The
dead band should be set for the lowest value that still prevents the relay from chattering.
Source 1, 2 or 3 Cycles Low Alarm
(only appears if Type of Bleed is Based on Cycles of Concentration)
Type in the text box the cycles of concentration for each Source below which you want to activate
a low alarm.
Source 1, 2 or 3 Cycles High Alarm
(only appears if Type of Bleed is Based on Cycles of Concentration)
Type in the text box the cycles of concentration for each Source above which you want to activate
a high alarm.
Interlock Outputs
Click the check boxes to select or de-select the relays that you want to be forced OFF if this output
relay is turned ON. If you do not need any other output to shut off when this relay turns on,
UNCHECK all boxes. The selection is mutually exclusive, meaning that if the Feed output has the
pH output interlocked, the feed won’t turn on if the pH output is on, and the pH output won’t turn
on if the Feed output is already on. This feature should be used with caution since it can
potentially delay a chemical addition for a long time. Typical uses are to prevent inhibitor feed
during a biocide addition, or to prevent bleed and pH control during inhibitor feed.
Bleed Time Limit
Type in the text box the maximum amount of time that the bleed valve can be continuously open
before the controller shuts the valve and activates a Bleed Time Limit alarm. This is intended to
prevent the bleed valve from turning over the whole system if the conductivity input fails in such a
way that it will never close the valve. For example, the conductivity may be stuck at a value above
the set point, and can’t respond to changes in conductivity.
Note that the bleed valve will not open again until someone resets the timer!
It will take some experience to find out what the normal bleed time will be. If the valve cycles
open and closed under worst case loading conditions in 30 minutes, you may want to set the Bleed
Time Limit at 60 minutes.
Hand Time Limit
Type in the text box the maximum number of minutes that the bleed output can be activated in the
Hand mode. Any value between 0 and 1440 is acceptable. A value of 0 means the pump can be left
on indefinitely. Click on the “Submit” button to save the changes.
Bleed Output Mode
Click on the radio buttons to manually control the bleed valve. The normal selection will be Auto,
where the controller uses the various set points to open and close the valve. You can force the
valve open regardless of the set points by selecting Hand, or force the valve closed regardless of
the set points by selecting Off.