74
Daily Max Time
Enter the maximum amount of accumulated on-time, in Hand or Auto modes, that the
relay can have between midnight and midnight the next day. If the time is exceeded, the
relay will deactivate, and a Daily Max Timeout alarm will be triggered. The alarm will
clear, and relay allowed to reactivate at midnight the next day.
If the relay was in Hand mode when the alarm was triggered, it will revert to whichever
HOA state it was in prior to being set to Hand.
To override the Daily Max Limit for the rest of the day, press Reset Output
Timeout.
5.3.6
Relay or Control Outputs, Percent Timer Control Mode
Output Details
The details for this type of output include the relay on/off state, HOA mode or Interlock status, cycle time, accumulated
on-time, alarms related to this output, current cycle on time, relay type and the current control mode setting.
Settings
Touch the Edit icon to view or change the settings related to the relay.
Sample Period
Enter the duration of the sample period.
Feed Percentage
Enter the % of the sample period time to use for the feed relay activation time
5.3.7
Relay or Control Outputs, Biocide Timer Control Mode
ONLY AVAILABLE IF HVAC MODES ARE ENABLED IN CONFIG MENU – GLOBAL SETTINGS
Basic Timer Operation
This algorithm is typically used to provide a baseline amount of chlorine for disinfection, and periodically shock-
ing the system with a larger dose. During normal operation, the relay will be reacting to the sensor to maintain
a set point within a programmable Deadband, as described in On/Off Control Mode above. When a Spike event
triggers, the algorithm will change from the normal set point to the Spike Set Point, for the programmed time.
Once the time expires, control to the normal set point resumes.
Basic Biocide Operation
When a biocide event triggers, the algorithm will first prebleed (if a prebleed is programmed) for the set amount of
prebleed time or down to the set prebleed conductivity. Then the biocide relay is turned on for the set duration. This is
followed by a post-bio add lockout that blocks the bleed relay from turning on for a set amount of bleed lockout time.
Special Condition Handling
Prebleed
If both a time limit and a conductivity limit are set, the time limit takes precedence. The bleed relay will turn off
once the time limit is reached or when the prebleed conductivity limit is reached (whichever occurs first). If the
prebleed has a conductivity limit set, then the time limit can’t be set to zero, as this would allow the prebleed to
last forever if the conductivity limit is never reached.
Overlapping biocide events
If a second biocide event occurs while the first one is still active (in prebleed, biocide add or lockout), the second
event will be ignored. An Event Skipped alarm will be set.
Interlock Conditions
Interlocks override the relay control, but do not change the operation of the timers or related bleed control.
A no-flow (or other interlock) condition does not delay a biocide add. The biocide add duration timer will contin
-
ue even if the relay is locked out due to a no-flow or other interlock condition. This will prevent delayed biocide
adds which can potentially cause higher than expected biocide concentrations in the system when two biocides
adds occur close to the same time. Not allowing delayed biocide adds will also prevent incompatible biocides
getting added at close to the same time.
