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This is a how to video on how to wire an A419 temperature controller from Johnson Controls. Remember to be very careful when dealing with electricity as it nothing to be played with. After watching my video, if you still are not sure please consult an expert. You do not want anything bad to happen.
Remember : I do not take responsibility if anything goes wrong. I have wired the controller correctly on my end, so if anything goes wrong, It is not my fault.