2 months ago, we had the HVAC professional to replace the contactors on our heat pump system. Now i have the same problem again, the contactors aren't triggered on when heating is on. And, he told us that we need to replace another part in the system. I found on the web that the part he wants to replace called adjustable temperature same as on the pic, web link below. Part # AT012.
So he left me with a wire with two clamps at the ends to bypass this when the contactors aren't triggered. I did what he told me and it worked.
my question is what is this adjustabel temperature for?
Thank you in advance.