Installation and Operation Manual
Page 23
suffocates roots.
Scheduling
Planning how long to water (zone run times), when to water (program start time) and
which days to water (watering days).
Soak Cycle
A Soak Cycle is used for hillsides or slopes to avoid surface runoff by watering for a short
period of time, stopping and allowing the water to soak in, then continuing another short
period of time until the full required amount of water has been applied.
Soil Moisture Sensors
Soil moisture sensing has been attempted for 40 years with limited success. Prior to the
development of the Acclima Digital TDT™ sensor soil moisture sensors were subject to
unstable readings due to temperature, chemistry and compaction sensitivities. The
Acclima Digital TDT™ soil moisture sensor provides readings of absolute moisture content
that are stable to within 1 percentage point over all temperature and soil chemistry
ranges in which grass will grow. It is the only sensor on the market that meets that level
of stability. Stability is essential for irrigation control.
Start Time
A start time is the time of day selected to begin the watering cycle. Each program (A, B,
C, and D) and each sensor program (S1, S2, S3…S36) can have up to 6 separate start
times.
Suspended Cycle Irrigation
The SC24/36 operates as a Suspended Cycle™ controller when using sensor programs.
The controller uses programs to control the time and date of watering but then suspends
irrigation if the soil moisture level is above the user set threshold when the program start
time arrives. Irrigation is allowed at the next start time when the moisture level drops
below the threshold.
Terminal Block
Connection points for valve wires, common wires, master valve, pumps and other
accessories located behind the front panel of the controller.
Valve Common Wire
The common wire is the circuit that is common to all the valves in the system. Each valve
has one wire attached directly to the common. The SC24/36 uses this wire for
communication from the controller to the sensors, and flow meters throughout the
system. The other wire connected to the valve that is not common to the other valves is
often called the Zone Wire.
Water Budget
Water budget is a seasonal adjustment that enables the runtime of all zones only to be
adjusted in 5% increments from 10% to 200%. For selected months, the timer program
duration is multiplied by the water budget percentage and activated for that adjusted
duration.
Water on Demand Irrigation™
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