Posted by UA Fitter on January 13, 2013 at 09:44:55 from (74.112.141.8):
In Reply to: Furnace Help! posted by James Wheland on January 13, 2013 at 08:52:27:
That blower is the draft inducer, and it creates the draft necessary for the very cool combustion products of a high efficiency furnace to exit your house via the PVC vent. I don't know where you live, but sometimes in cold weather, the vent will block from an ice accumulation, making the air flow switch in the furnace not make and preventing the furnace from firing, check the outlet. If it's clear, open the furnace, and you will see a tube running from the inducer housing to an air flow switch. Use a multimeter or test lit to prove that the switch is making. I'll bet your problem is somewhere in the vicinity.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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