In smaller greenhouses, a manual program opened and closed yourself could be installed. These work simplest when the screen materials is supported by a monitor system.

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

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

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