Ok guys, here it is.
Now, there are two possible modes of operation with this thermostat.
You can:
1. get the thermostat to switch on an electrical appliance when the temperature in your enclosure drops below your desired temp (like an ale fermentation box for example. You may use it to turn on a low wattage light bulb to raise the temp).
2. get the thermostat to switch on an electrical appliance when the temperature in your enclosure raises above your desired temp (as in a lagering fridge. When the temp rises your fridge will turn on and hence lower the temperature).
In order to have both these options available to you from the one thermostat you need to install a switch (see wiring diagram). The installation of this switch to flick between both modes is also available to those with a Growarm thermostat, but check this with a multimeter to make sure. It's exactly the same in my experience, but you make your own judgement.
I installed this thermostat in an extension lead. I cut open the insulation and found the wire that I wanted (the active, it was brown in my case but the colour can change) then cut the wire and installed my switch and thermostat here. I used a Jaycar jiffy box to house the thermostat and mount the switch, I suggest you do the same. There are other options available (like the installation of a plug fitting as seen in the growarm controller) but I leave the creative stuff to you.
Good luck guys. Be safe, check your work and hopefully everything will work out great.
Cheers, Justin
Disclaimer-I'm not an electrician. If you fry yourself- I'm not at fault. If you doubt your ability to perform this wiring safely or check your job, then get someone that knows how to do it to either help, do the job for you or check your work for you. I offer this info out of a will to help others, it is correct to the best of my knowledge. It is not difficult stuff but undertake this project at your own peril.