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10.7 Configuring an Event-Other Relay
10.7.1 Schedules, Prebleeding, Lockout and
With a Sensor
Events are typically used to feed biocides on a
pre-determined schedule with weekly or daily
schedules being the most popular. An example
might be; Every Monday feed biocide A for 20
minutes at 7 AM, then feed biocide B every
Thursday, for 25 minutes at 7 AM. You can
choose a 28 day cycle to accommodate feeding
every other week.
Schedules generally do not follow a calendar.
Daily choices repeat every day. If you choose the
28 day cycle, the next screen will tell you which
week you are in, 1 – 4. Weekly entries match a
weekly calendar. Sunday is day 1 and Saturday is
day 7.
Any event has an option to configure prebleeding
and/or lockout to maximize the effect of the
product. The idea of locking the bleed valve during
and after feeding a non-oxidizing biocide improves
effectiveness by increasing contact time.
Programming a prebleed ensures that the tower
not cycle up above the blowdown set-point
avoiding a scaling situation. The prebleed setup
will open the bleed valve until a timer has expired
or a low conductivity set-point is reached. The
feed is delayed by this action.
If you have not enabled the Feed relay, see
10.6 Configuring a Feed Relay
Use an event in conjunction with a sensor to limit ON
time during the event. See
Sensor with Event Control
10.7.1.1 Prebleed/Lockout
The following steps are a continuation of
Schedules, Prebleeding, Lockout and With a
Sensor
If your event does not require a Prebleed or Lockout,
skip to section
NOTE: In addition to a feed relay, this procedure
requires the use of a blowdown relay. See section
10.5 Configuring a Blowdown Relay
1- From the Daily, Weekly or 28 Day screen,
choose F3
2- Press F1, Select to choose
3- Scroll down to find the blowdown relay and
press F1 to
4- Scroll down to find the Conductivity sensor and
press F1 to
5- Press F3 to return to the Configuration menu
and F1 to Select
6- Use the arrows to adjust the Prebleed time.
Press F1 to
7- Press F3,
8- Press F1 to choose
9- Use the arrows to edit the lockout time. This
value should include the feed time of the pump.
It is not the length of time after the pump stops.
10- Press F1 to
We are now ready to add events to the relay. The
relay should be named as well to avoid confusion.
This menu is the same for Pulse relay event
configuration.
Page 71 of 102
Programming the Outputs
9.5.5 Feed Based on a
10.7.2.1 Adding Events
as before.
CONFIG
Prebleed
it
SELECT
it.
SELECT
again.
Prebleed
SAVE
.
Config
Lockout
.
Save
section
10.7.1
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