Irritrol IBOC-Plus User Manual

Page 11

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When a watering start time is selected, that time becomes the beginning

of an automatic watering cycle. A watering cycle operates each station

assigned to the program, one by one, in numerical order.
In the following example, (also shown on the sample watering plan on

page 10) we have set up Program A to start at 2:00 a.m. and again at

3:00 a.m. on a 1-day interval (every day). Stations 1, 2, 4 and 5 are front

and back yard lawn areas which get full sun throughout the day. These

stations will run for 10 minutes each for a total of 20 minutes run time

per day. Stations 3, 6 and 7 are lawn areas which are shaded during the

afternoon hours. These areas require less water, so we have assigned them

to Program B and set them to run for 20 minutes on a 2-day interval

(every other day).
At 2:00 a.m., Program A watering cycle starts. Station 1 turns on, runs

for 10 minutes, and shuts off. Station 2 turns on, runs for 10 minutes, and

turns off. Stations 4 and 5 operate sequentially in the same manner, each

running for their set run time. When Station 5 shuts off, the watering

cycle is completed for the first start time. At 3:00 a.m., the watering

cycle starts again and repeats the same station-by-station watering

Note that we have 40 minutes total watering time per cycle in

Program A. If we had set the next start time at 2:30 a.m., the start time

would have been delayed until 2:40 a.m., enabling the first cycle to finish

as programmed. This function is called “start time stacking”, and can

occur within each program.
Watering programs, however, operate independently, which means that

two or more programs can run simultaneously. In our example,

Program B will also start at 2:00 a.m. Therefore, Stations 1 and 3 will

turn on at the same time, and Station 2 will turn on while Station 3 is

running. This feature enables more watering to be completed within the

prime “watering window”, which is generally between Midnight and

6:00 a.m.
Note: When scheduling watering programs to run simultaneously, it is

important to ensure the water supply has sufficient pressure and volume

to maintain optimum sprinkler performance.


Programming the Controller