Hi guys! I'm at work now so I can't spend a lot of time on this right now. I just want to clarify the use here. I have an old free standing gas furnace. The temp sensor I am using is on the exhaust pipe. When the furnace ignites, the pipe temp rises. At 75 I am able to pull heat from the furnace with a duct fan that I installed. This is when the blower should turn on. The furnace runs and pipe temp increases. When the furnace turns off the pipe temp begins to drop. I can still pull residual heat from the furnace. At 90, the furnace has cooled enough that I cannot pull any more heat. This is why the blower needs to turn off at 90.
Thanks for all your replies! I will try some of them in the morning and let you all know what the final solution is.
At 80° both rules would fire because both conditions are met. So, it wouldn't turn on when it first got above 75. I tried it with my bathroom fan and a virtual temp sensor earlier.
As long as you did nothing to cause any reevaluation. But as soon as you put anything else into play, another condition or a restriction, you're screwed.
