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  1. Replies
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    Limit Switch/Fan Relay

    All: I've been writing from time to time to tell you abou the furnace problems I've been having. Most recently, I spent megabucks enlarging the supply and return ducts, adding a bypass damper, and...
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    By-Pass Damper

    They installed it coming off the main part of the furnace (I don't know the technical name for it). It dumps the excess air into the basement.
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    Find the Problem

    Mr. FSH: The tech did find the problem, or so we thought. He said that the problem was caused by the limit switch tripping, which was caused by undersized ducts and absence of a by-pass zone. We...
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    Ongoing Furnace Problems - Part 8,977

    All: Here's what's been happening thus far.

    The techs replaced the supply ducts with larger supply ducts, replaced the return ducts with larger return ducts, added a return duct going to the...
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    Thanks for the Information

    Thanks to everyone, including Mr. Twill (why I don't know), for the information...I'll let you know how it turns out.
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    Instructional Video

    Mr. Twill: Very educational video. Thanks for the information.
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    Furnace Problems - The Legend Continues

    All: If you check my previous posts, you'll see that I've been having ongoing problems with my forced air furnace, primarily related to the limit switch. I believe that the problem with the limit...
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    Code vs Technical Manual

    I am not a HVAC pro, and I only know what I read and what I hear about HVAC issues. I understand that there are technical manuals that will tell you what size duct to use with what size furnace or...
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    Changing Careers

    I'm not a hvac technician, but I've used several over the years. Based on my discussions with all the techs who serviced my equipment my opinion is that being a hvac technician is technically...
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    Manifold Pressure/BTU Input

    This is a problem that I was having with my furnace. The limit switch would trip, and the blower would continue running. It wouldn't shut off, even if I tried switching it off from the thremostat. ...
  11. A/C Replacement and Ductwork - Results

    All: The utility company finished the a/c replacement and ductwork extension. The workers left the work location cleaner than when they started. All work seemed to be neat. For the first time in...
  12. Utility Ductwork and Other Stuff

    M Kilgore: The utility, in this instance, does not subcontract anything to anyone. According to the estimate and guarantee/warranty provided by the utility, the company does its own metal work,...
  13. Replacing Central A/C; Adding/Extending Ductwork

    By way of background...a few years back I was looking for advice about the heating/cooling problems I was experiencing, e.g., tripping of high limit switch; blower continues running until the next...
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    I've written in this forum a few years ago, and...

    I've written in this forum a few years ago, and at that time most of you indicated that I had wasted my money with my Trol-A-Temp system, and that I should NOT close off any one zone, lest I trip the...
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    Thank you, everyone, for your input. I...

    Thank you, everyone, for your input. I personally prefer the flow through humidifiers because of less maintenance required. But, given my horrendous cash flow management, I'm not going to replace...
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    If/when the current humidifier dies, I plan on...

    If/when the current humidifier dies, I plan on replacing it with an Aprilaire as indicated above. The furnace is a Frigidaire (Nordyne) high efficiency unit.
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    High Limit Switch - Update

    All: As I had told you earlier, I discussed the problem with a hvac person who was highly recommended by a friend. We decided that I would call his office the next day (which I did) to set up an...
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    Just curious...In my other homes I had a...

    Just curious...In my other homes I had a drum-type humidifier on the furnace, the kind where you have to change the media pad and clean out the water pan. In my second home I had an Aprilaire...
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    All: I took your collective advice and today I...

    All: I took your collective advice and today I spoke with an independent hvac person about the problem with my furnace. As all of you have been saying, he said that he'd have to take a look at the...
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    MikeJ and Trane: Thanks for your concern. And...

    MikeJ and Trane: Thanks for your concern. And Trane is right. Understand that I want to make sure that I've looked at the problem from every angle (it's a holdover from my job...I investigate...
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    Mr. Been: Thank you again for your input. There...

    Mr. Been: Thank you again for your input. There is no bypass damper. The trol-a-temp was installed so that the zone that is not calling for heat closes while the zone that is calling for heat...
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    Penguin: Funny that you should mention biting...

    Penguin: Funny that you should mention biting the bullet...I've been away from my reloading press for about two years...maybe this is an omen that I should start reloading again. Read my other...
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    Mrbillpro: Exactamundo! The heating cycle works...

    Mrbillpro: Exactamundo! The heating cycle works fine, it's just that the fan keeps running after the heating cycle finishes. I am still working with the original thermostats. The limit switch...
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    MikeJ: You hit on an interesting point...I never...

    MikeJ: You hit on an interesting point...I never made it clear that the furnace was running through the heating cycle normally, i.e., the thermostat would indicate that the set temperature was...
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    Herr Smokin: The only reason I'm moving toward...

    Herr Smokin: The only reason I'm moving toward cleaning the coil is that it seems that the pro posters are telling me that air flow is being restricted. There was no problem with the unit for five...
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