Manual

103
DXi User Manual
Appendix B: Flow Sensors
If the monthly limit is exceeded, there are two options available, STOP and
WARNING. See Chapter 5: Program Entry for details on selecting each option.
If the STOP option is selected, the problem is reported in the alert list and watering
stops.
Watering is restarted when:
• the limit is changed to a larger value
• the program option is changed to Warning
• a new month begins
If the WARNING option is selected, an alert is reported in the alert list and watering
continues.
Unscheduled Flow Limit
Unscheduled Flow Limit is defined as any water flow that is not programmed or
under the control of the controller. If a water flow is greater that the limit, the flow
check delay has been met, and no stations are on, the controller will shut down the
water supply until the condition is corrected.
Unscheduled Flow conditions may be due to broken water lines, defective valves,
faulty solenoids, etc.
The Unscheduled Flow procedure is given in the Controller Setup section of
Chapter 4. The default limit is 0 GPM.
Enabling and Disabling Flow Limit Checking
Once the station limits have been established, the flow limit checking (upper and
lower limits) may be enabled or disabled. When upper limits have been enabled, all
station upper limits will be enforced. When lower limits have been enabled, all station
lower limits will be enforced. See Chapter 4 for the steps to enable or disable station
flow limit checking.
When limits are disabled, no limit checking is performed. However, the GPM flow,
total monthly flow readings, the Monthly Limit, Main Line Limit, and unscheduled
limits are all unaffected.
Delaying Flow Rate Limit Checking (Flow Check Delay)
Due to drainage of water lines, the initial flow rate for a station may be much higher
than the station steady state condition. To prevent erroneous station fault detections,
the controller delays a period of time after a station is turned on before making flow
rate limit checks. This delay may be set from 2 to 6 minutes.
The system default for delay of limit checking is two (2) minutes.
To establish the proper delay, monitor the GPM flow rate for each station in the
irrigation program(s).
Observe which station takes the longest time for its GPM rate to "settle." Round this
time period to the next minute and use this rounded value as the flow rate limit check
delay.