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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.

Use Products

ZEN V2 Programmable Relay ZEN V2

Even Broader Applications with Increased Functionality and Higher Precision