iGrow 1800 Installation Guide
Page74
Link4 (714) 524-0004
Accumulated Light Irrigation
02 Irr02 Irr
Mode: Accum Light
hr mm ss
OnTime: 00:00:00
Accumulated light mode allows the iGrow 1600/1800™ to turn the Irrigation channel on for a duration
equal to the OnTime.
02 Irr02 Irr
Start
_SRise
07:00A
End at 07:30P
Accum Light
The irrigation valve will only turn on between the Start time and End time and will only do so when the
appropriate amount of light has been accumulated. Both of the start and end times can be astronomically
adjusted to vary with respect to either sunrise or sunset. Please note that if the accumulation does not reach
the threshold at the end of the time window the accumulation will still continue, however, if the threshold is
reached outside the time window, irrigation will not take place until the beginning of the next active time window.
02 Irr02 Irr
6000 W/m2h at 55°F
3500 W/m2h at 85°F
Max Off 8:00 hh:mm
In the third screen you will need to set the accumulated light threshold. You have the option of setting it as a
function of the air temperature. For example, you might have a threshold of 6000 w/m2-hr at a temperature of
70 ºF and a threshold of 5550 w/m2-hr at an air temperature of 80 ºF. The threshold will then be a straight line
interpolation between the two temperature thresholds. Note: If you don’t want it set as a function of
temperature, then simply make the two accumulated light entries the same.
02 Irr02 Irr
6000 W/m2h at 55°F
3500 W/m2h at 85°F
Max Off 8:00 hh:mm
S1 = 6.0 kW/m2 at 85°F
S2 = 3.5 kW/m2 at 55°F
The crosshairs represent the irrigation trigger point.
This location will change as the actual temperature
changes
