I want to lower the temp on my laminator 4250?

I am using lam 2 film which is low temp film and my 4250 get too hot and starts to melt the film in place on the roll. My 4250 shows that it is ready to use when the amber flashing light goes to the green light indicating that it is ready to use. The green light switches ready at 275 degrees but the 4250 continues to heat to 320 degrees before it starts to cool and then starts to heat again at 280 degrees, I need to make an adjustment to lower the temp and I would think that there is a simple way to do this but where.