In smaller sized greenhouses, a manual program opened and closed by hand could be installed. These work easiest when the screen material is supported by a track system.

Start time – when in the morning will the display screen system start operation
Stop period – when in the afternoon will the screen system stop operation
Light level – at what light intensity will the screen end up being activated either to open up or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this Motor Gearboxes For Greenhouse models the percent open up or close position under different circumstances such as in early stages a winter early morning to lessen thermal shock or through the summer to supply better shading. The gap steps and speed of motion can be controlled in some systems.
Time delay – under changeable climate this avoids frequent starting and closing
Wind speed – To lessen high temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this can open the display screen and turn on heat when it starts to snow.
The typical system uses nylon monofilament or stainless steel cables to support the screen material. The screen material can possibly rest on top of the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that techniques the industry leading of the screen materials. Control can be either with a manual change or electronic controller.

Based on the over, the grower must enter the following parameters in to the controller:

A weather station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.