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  1. Replies
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    $140 dollars for a furnace circuit board...

    $140 dollars for a furnace circuit board installed is a very low price. $800 dollars is high. For most full service HVAC companies $140 dollars hardly covers the travel and diagnostic time. Thereís a...
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    I get it that many people want their ducts to be...

    I get it that many people want their ducts to be cleaned simply because the return ductwork has some dust accumulation. Even if they know thereís no IAQ benefit.

    If I lived inside my return air...
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    $1,000 dollars a day is nothing, Iíve seen a...

    $1,000 dollars a day is nothing, Iíve seen a company that made more than that per job. This duct cleaning company would advertise $99 dollar whole house duct cleaning. They would then do the work and...
  4. Thread: On Call Delima

    by Wild
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    1,207

    What is your employee compensation for being on...

    What is your employee compensation for being on call?

    It seems like it would be tough to be profitable fielding technicians to the new location. If itís not profitable and going to cause poor...
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    I think the higher cost of living these days has...

    I think the higher cost of living these days has a lot to do with it. The national median income for an HVAC technician is $41,000. That isnít an income thatís going to give you very much financial...
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    He should've told his mama heíd clean his room...

    He should've told his mama heíd clean his room for $99 dollars. Then went out to the garage and grabbed his dadís leaf blower and cleaned his room with it.

    Once the cleaning was done heíd go back...
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    Nice before and after pictures, it looks like...

    Nice before and after pictures, it looks like your company is part of that very small minority that does a great job cleaning air ducts.

    But I'd also like to see a picture taken of those return...
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    The IFC board places an AC potential from about...

    The IFC board places an AC potential from about 60 to 100 volts onto the wire connected to the flame sensing rod. When air and fuel are burned flame ionization occurs. These ions have the ability to...
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    Just my opinion

    If you do decide to enter this trade I would recommend getting the degree, there will likely be some point down the road where you need it to obtain a certification or license. But like any education...
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    What causes a mist out of supply registers?

    Anybody ever have a mist come out of all the supply registers? It's a white vapor that continuously blows out of the supply registers about a foot or so. This is a 5 ton split system with the furnace...
  11. Thread: Training

    by Wild
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    What was the rating printed on the pressure...

    What was the rating printed on the pressure switch? Sounds to me the pressure switch was bad.

    The rating on the pressure switch is the pressure at which the switch makes. It should break .15...
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    I was wearing gloves that had a flap on them that...

    I was wearing gloves that had a flap on them that covered your fingers to keep them warm or you can fold it back and use your fingers to work. Well I took the blower panel off a RTU and that flap got...
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    When ducts get really bad (Like in post #6 by SO)...

    When ducts get really bad (Like in post #6 by SO) I recommend cleaning them, but in most cases the money is better spent on other IAQ accessories that will actually make an improvement.

    For...
  14. Thread: 90% furnace fire

    by Wild
    Replies
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    5,481

    Sounds like one of the orfices didn't get put in.

    Sounds like one of the orfices didn't get put in.
  15. Thread: HVAC Super Pro ?

    by Wild
    Replies
    34
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    5,987

    I tried some of this stuff out today and wasnít...

    I tried some of this stuff out today and wasnít impressed. You canít pull it apart but with smaller 3/8 tubing you can break it apart with your hands. I definitely wouldnít trust it around the...
  16. Thread: HVAC Super Pro ?

    by Wild
    Replies
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    5,987

    Seems like this is a better technique if you...

    Seems like this is a better technique if you think about it.

    You eliminate any possibility of oxidation on the inside of the copper. You eliminate the possibility of damaging a service valve, txv...
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    What are you selling as a service tech; system...

    What are you selling as a service tech; system enhancements, duct cleaning, service agreements, equipment, etc.? And what do you get 20% commission on?

    20% of 900k is 180k, plus your $20/hr wage....
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    Or he may have been referring to annual revenue...

    Or he may have been referring to annual revenue he created for the company he works for.
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    Why are LG's Cool Art on the way out?

    Why are LG's Cool Art on the way out?
  20. Thread: New Lennox system

    by Wild
    Replies
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    19,993

    For a contractor to become a Lennox Premier...

    For a contractor to become a Lennox Premier Dealer they must receive a good review on the customer surveys that Lennox sends out to their customers. However the contractor gets to decide which of...
  21. Thread: Not my day

    by Wild
    Replies
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    4,075

    Yo Bannerd! Why did you post pics of only the...

    Yo Bannerd!

    Why did you post pics of only the gas piping connected to the furnace when youíve apparently completed the install? The fittings obviously havenít been tightened in the pics. Are you...
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    I doubt any of the four contractors will...

    I doubt any of the four contractors will entertain youíre request of a breakdown on the pricing of materials and labor cost. Even if a company did share with you how much they mark up their price on...
  23. So I wonder what will happen when CynicX...

    So I wonder what will happen when CynicX customers discover theyíre only going to receive a $1500 tax credit versus what they were promised by his company. Iíd think the company would be responsible...
  24. Credit Details: 30% of the cost, up to $500 per .5 kW of power capacity

    If this solar panel is only 170 watts then how much of a tax credit can you claim?
  25. Replies
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    Well you were the one that was coming to the...

    Well you were the one that was coming to the conclusion that the only explanations of a furnace being 30% less efficient are that the flue gas must be 340 deg or thereís hydrocarbons that are...
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    Itís not so much that there is less heat to...

    Itís not so much that there is less heat to transfer but rather less heat is being transferred.



    When manufactures rate their equipment in a laboratory they squeeze of every bit of efficiency...
  27. Replies
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    If you calculate duct loss thatís a separate...

    If you calculate duct loss thatís a separate issue. So I agree with you that anyone calculating duct losses and blaming it on the furnace is BS. If they are calculating duct losses and then offering...
  28. Replies
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    Okay, so what method do you suggest for...

    Okay, so what method do you suggest for calculating efficiency in the field?
  29. Replies
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    You keep thinking in terms of the lowest flue...

    You keep thinking in terms of the lowest flue temp equates to the highest efficiency. Or that if a furnace is less efficiently transfering heat then the lost efficiency must be hiding somewhere in...
  30. Replies
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    Thereís no doubt in my mind that there are many...

    Thereís no doubt in my mind that there are many people here that are much smarter than I am. So perhaps somebody on this board can explain something to me.

    I donít understand how a heat exchanger...
  31. Replies
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    1. We install furnaces in accordance with...

    1. We install furnaces in accordance with manufactures recommendations and in compliance with all national and local codes. And yes that includes being properly sized and having proper airflow. But...
  32. Replies
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    I donít measure heat loss in the flue I measure...

    I donít measure heat loss in the flue I measure it in the ducts at the furnace where itís being delivered. And no your example doesnít seem realistic. How are you measuring 21,000 Btuís in the flue?
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    When I say thermal efficiency Iím referring to...

    When I say thermal efficiency Iím referring to delivered Btuís in the duct at the furnace. I donít go around the house measuring duct loss, besides all the duct is in a conditioned space so I think...
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    Yeah, the next question I ask them is what type...

    Yeah, the next question I ask them is what type of furnace they had in before we replaced it last year. Funny how many people canít answer that question. But I can tell you the vast majority of the...
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    Too much flue gas still in the flue after the...

    Too much flue gas still in the flue after the furnace has cycled off. And the only thing it does efficiently is rot out the pipe.
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    I guess that must be it, after all there just...

    I guess that must be it, after all there just isn't a reasonable explanation for the manufacturers to focus on only the benifits of their product.
  37. Replies
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    I test furnaces quite a bit as a service and...

    I test furnaces quite a bit as a service and installation tech. I donít really consider that to be research or evidence, just on here sharing what I see in the field and learning from what others...
  38. Replies
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    I was referring to thermal efficiency which I...

    I was referring to thermal efficiency which I thought was the topic of discussion in regards to the efficiency loss being discussed in this thread.

    Iím not exactly sure what youíre asking with...
  39. Replies
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    Iím not following what youíre asking or saying. ...

    Iím not following what youíre asking or saying.

    When the furnace is in the low stages you have less efficient heat transfer to the heat exchanger. If itís a condensing furnace it exhausts the...
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    Many homeowners see little savings, no savings,...

    Many homeowners see little savings, no savings, or a small increase in their gas bills. Most donít voice their complaint and the ones that do hear excuses about increased gas prices or colder...
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    This thread is making my head spin thinking about...

    This thread is making my head spin thinking about heat transfer in a hx.

    The bottom line is that in high fire or any time you increase the gas pressure youíre going to have a hotter flame and...
  42. Replies
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    The draft inducer motor does slow down but Iíve...

    The draft inducer motor does slow down but Iíve still never measured the same level of excess air (O2) in high and low fire. What I find is that in low fire the O2 is on average 3-4% higher.

    I...
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    In regards to your question, how can you have the...

    In regards to your question, how can you have the same amount of excess air in low and high fire? In low fire you have a lower gas pressure and therefore more excess air. So the excess air will never...
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    Ok I think I get it now, thanks Captain Irony.:D...

    Ok I think I get it now, thanks Captain Irony.:D However youíre comparing how two different fuels are burning at complete combustion. And in this case CO burns hotter and releases less heat than...
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    It was confusing me because I think in terms of...

    It was confusing me because I think in terms of burning fuel and CO is just a product of combustion not something that also burns and affects the flame temperature.
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    So letís say on a typical 70,000 Btuh furnace you...

    So letís say on a typical 70,000 Btuh furnace you have 1.7Ē w.c. in low fire with a 12% O2 reading and in high fire its 3.5Ē w.c. with a 9% O2 reading. So the difference in flame temperature is 500...
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    I noticed you brought up CO burning a number of...

    I noticed you brought up CO burning a number of times but Iím not making the connection of how itís affecting efficiency or flame temperature in the combustion chamber. Could you explain this a...
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    How many swedges are in that liquid line? It...

    How many swedges are in that liquid line? It looks as if they pieced together the scraps from previous jobs.

    Guess thatís one way to be ďeconomicalĒ.

    Explains why they install filter driers,...
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    Is it still more satisfying to get extra years...

    Is it still more satisfying to get extra years out of an A-coil when you know itís going to cost you lower efficiency, lower capacity, and shortening the life of the compressor?



    The...
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    I agree that itís BS that a tech should be...

    I agree that itís BS that a tech should be providing such expensive tools. I disagree that you should just look for another job and tell the owner to shove it, but maybe I'm just being a sucker as...
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