Greenhouse Air Circulator Control(1)
Case Number 347
last update: October 7, 2010
Intermittent operation of circulation fans on winter nights, using Weekly Timer and Calendar Timer.
The ZEN can be used to operate circulation fans only at night (e.g.,19:00 to 6:00) during winter (e.g., November 15 to March 30). During operating times, the fans operate intermittently, 60 minutes ON and 30 minutes OFF. The fans start up 30-s apart to keep the startup current down.
You set the start and stop days during winter (e.g., November 15 to March 30) using the calendar timer (*0). You set the start and stop times during the night (e.g., 19:00 to 6:00) using the weekly timer (@0). You set the staggered startup time and run/stop cycles using timers (T0 to T2).
Benefit / Efficiency
It is possible to automatically control the calendar timer and the weekly timer with a ZEN alone. Because individual wiring is not necessary, you can reduce the wiring time greatly.
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