No taping wires together, no bare wires laying about, no twisting connections together.
Ok, clear. The last two look feasible. Just for future application. How did you know that I need to connect the heater to a 12 V power supply? In the manual, the only 12 V I read is for another version of the PID to be connected with a SSR. How could I get to know this detail?
I have also this mica heating pad, 80 W http://uk.rs-online.com/web/p/mica-heating-pads/7904842/In case I would instal this heater instead, which modification should I do? Shell I just plug the heater in to grounded (the pad has three connectors) power supply and the PID?