Hi All - I'm a newbie to this but have been periodically watching some forums here over the past months. Mostly, forum(s) on hot boxes. Anyways, what up.
Well, I have now completed the guts on my hotbox, but I'm still working on figuring out what I want to do about the controls. From what I can gather, there really are two good approaches: (1) PID controller + SSR and (2) normally closed contacts of 140F range thermostat that has adjustable differential. Would those that have done it agree?
I was thinking of avoiding the PID approach and have been looking at a particular line level thermostat until I noticed that the differential is kinda poor (http://www.grainger.com/Grainger/items/1ZHC7
) at 12 deg. Based on some of the recent posts, I'm thinking of going with the Ranco unit (http://www.grainger.com/Grainger/items/3ZP77
), but I have one concern. It states the full load amp rating of the switch is only 5.8A (on normally closed). My heater is 1.5kW max.....has anyone used this switch above it's max rating? Maybe a different way to ask is, has anyone used this Ranco unit with greater than a 700W heater? If so, does it work well?
I'd appreciate any suggestions. Of course, I'd be curious to hear from those that have done the PID + SSR approach and how accurate of final temps it provides.