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OT furnace fan limit switch question??
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Posted by PhilcaseinWPa on October 24, 2006 at 11:41:02 from (146.186.55.48):
Well it's getting cold so like everything else I do I decided at the last minute to check to see if the furnace would run (natural gas, forced hot air). I cleaned out all the cobwebs and dust, set the thermostat and turned on the furnace. Started up just fine but the blower fan never came on and the furnace eventually stopped. Then tried to start again and would run a few seconds and shut off over and over. I found the fan limit switch for the blower and by turning the dial a little I was able to get the blower to kick on and run. Got the house a little warmer. But when the furnace kicked on again the blower wouldn't start unless I turned the limit dial by hand. Finally I got my glasses and a flashlight so I could see the dial clearly and there were 3 adjustable pins on the dial along with temp indicators and words limit/ off fan/on /off. I set the bottom pin (fan off I think) to about 75 degrees, the middle pin (fan on to 110) and the limit off to about 170. I started the furnace and it seems to work ok. I watched and the dial would turn as the furnace heated up, when it got to about 100 -115 the blower would kick on, when the house thermostat got to its setting the gas would turn off and the blower continue to run until the furnace cooled to below 70 - 75. So I guess I fixed it but I don't know what the heck I'm doing. Does anyone know the correct settings for a Honeywell fan / limit control? This is a Sears 145000BTU input,forced draft furnace. I'm asking this OT questions here because there always seems to be a lot of good information about everything on this board. Thanks. Phil
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