Eddy 1406 elec choke operation-Not "getting it"

OK. I finally got everything bolted together and adjusted (for the most part) and fired up my car on a nice cold morning. It fired right up and idled at 1500 RPM. I was so happy.
But then....the idle started to go up. within a minute or so, it had risen to 2500 RPM. I pressed the accelerator and it kicked down to normal idle. It was a bit rough since it was still a bit cold. Are the RPMs supposed to go up like that? I thought it started at high idle and came down to normal idle as the choke opened.
thanks