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B'down will set up the output for a blowdown. You
will need to identify the conductivity sensor in this
process. If the conductivity sensor is not currently
enabled, enable and configure it first. See
Enable an Analog or Digital Input,
Configuring a Blowdown Relay.
The Feed option prepares the output for a chemical
pump based on a sensor or water meter. See
Configuring a Feed Relay
Event-Other is used to configure a timed event
relay. Timed events are frequently used for non-
oxidizing biocides. See
Event-Other Relay
Each of these relay types have special control
functions available.
Blowdown has Captured Sample, (section 10.12.2)
and Varying Cycles, (section 10.12.3). Feed has
three types; Timed Cycling, 10.11.1, Time
Modulation, 10.11.2, and PID, 10.11.3.
Event-Other has Prebleed/lockout. This is not shown
as a separate option. It is included with the
Configuring an Event-Other relay
10.5 Configuring a Blowdown Relay
If you have not named the relay, See section 10.4
Naming the Output. If you have not enabled the
relay, see section
10.2 Determine if a Relay is
Enabled.
Blowdown relays require the use of a conductivity
sensor. See section
9.1.1 Enable an Analog or Digital
Input.
Relays set for Blowdown mode have the following
options; Simple bleed based on conductivity set-
points, reverse conductivity/inhibitor feeding or the
special control method using our boiler Captured
Sample routine.
Simple bleed is used on cooling tower applications
and large boilers that incorporate continuous
blowdown.
Boilers are covered in more detail in section
Special Control Functions
Invert the control action to feed inhibitor based on
conductivity,
see section
10.10 Control Action.
9.1.1
and
10.5
10.6
10.7 Configuring an
in section
10.7
10.11
To control blowdown on standard boilers, see
10.12.2 Captured Sample.
Simple blowdown:
1- Press MENU and scroll down to Set
Blowdown Mode. Press OK.
2- If more than one relay is set for this mode,
chose the one you are working on and press
OK.
3- Press OK for Sensor Control
4- Scroll down to your conductivity sensor, if
necessary, and press OK to select it.
Enter the ON and OFF set-points. Use the
5-
UP and DOWN arrows to edit the underlined
digit. Use the RIGHT and LEFT arrows to
move between the digits. Press OTHER to
switch between the ON and OFF set-points.
Press OK to save and exit.
6-
Use the I/O Setup screen to set
blocks. See
10.6 Configuring a Feed Relay
If you have not enabled the relay, see section
Determine if the Relay is Enabled
Enable and configure a
named the relay, See section
Output.
There are three relay modes; Blowdown, Feed, and
Event/Other. There are five types of Feed Relay
choices;
Feed based on a water meter,
Feed based on any analog sensor including
any 4-20mA input,
Bleed and/or Feed,
Using a percent timer or
Using a sensor during an event.
Page 67 of 102
Programming the Outputs
interlocks
10.8 and 10.9.
and/or
Relay. If you have not
10.4 Naming the
and
10.2
10.3
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