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  1. Replies
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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...
  4. Thread: Training

    by Wild
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    769

    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...
  7. Thread: 90% furnace fire

    by Wild
    Replies
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    5,349

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

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

    by Wild
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    5,412

    I tried some of this stuff out today and wasn’t...

    I tried some of this stuff out today and wasn’t impressed. You can’t pull it apart but with smaller 3/8 tubing you can break it apart with your hands. I definitely wouldn’t trust it around the...
  9. Thread: HVAC Super Pro ?

    by Wild
    Replies
    34
    Views
    5,412

    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?
  13. Thread: New Lennox system

    by Wild
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    19,259

    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...
  14. Thread: Not my day

    by Wild
    Replies
    52
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    3,790

    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 you’ve apparently completed the install? The fittings obviously haven’t 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 you’re 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...
  16. So I wonder what will happen when CynicX...

    So I wonder what will happen when CynicX customers discover they’re only going to receive a $1500 tax credit versus what they were promised by his company. I’d think the company would be responsible...
  17. 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?
  18. 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 there’s hydrocarbons that are...
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    It’s not so much that there is less heat to...

    It’s 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...
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    If you calculate duct loss that’s a separate...

    If you calculate duct loss that’s 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...
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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?
  22. Replies
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    34,084

    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...
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    There’s no doubt in my mind that there are many...

    There’s 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 don’t understand how a heat exchanger...
  24. 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...
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    I don’t measure heat loss in the flue I measure...

    I don’t measure heat loss in the flue I measure it in the ducts at the furnace where it’s being delivered. And no your example doesn’t seem realistic. How are you measuring 21,000 Btu’s in the flue?
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    When I say thermal efficiency I’m referring to...

    When I say thermal efficiency I’m referring to delivered Btu’s in the duct at the furnace. I don’t 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 can’t answer that question. But I can tell you the vast majority of the...
  28. Replies
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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.
  30. 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 don’t really consider that to be research or evidence, just on here sharing what I see in the field and learning from what others...
  31. 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.

    I’m not exactly sure what you’re asking with...
  32. Replies
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    I’m not following what you’re asking or saying. ...

    I’m not following what you’re asking or saying.

    When the furnace is in the low stages you have less efficient heat transfer to the heat exchanger. If it’s 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 don’t 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 you’re going to have a hotter flame and...
  35. Replies
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    The draft inducer motor does slow down but I’ve...

    The draft inducer motor does slow down but I’ve 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 you’re 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.
  39. Replies
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    So let’s say on a typical 70,000 Btuh furnace you...

    So let’s say on a typical 70,000 Btuh furnace you have 1.7” w.c. in low fire with a 12% O2 reading and in high fire its 3.5” 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 I’m not making the connection of how it’s 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 that’s one way to be “economical”.

    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 it’s going to cost you lower efficiency, lower capacity, and shortening the life of the compressor?



    The...
  43. Replies
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    I agree that it’s BS that a tech should be...

    I agree that it’s 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...
  44. Replies
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    Torches, digital scale, manifold gauges, micron...

    Torches, digital scale, manifold gauges, micron gauge, combustion analyzer, refrigerant leak detector, gas leak detector, sawzall, cordless drill, hammer drill, multi meter, pressure gauge, hand...
  45. Thread: Is this to code?

    by Wild
    Replies
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    551

    Code says it needs to discharge outdoors. Bad...

    Code says it needs to discharge outdoors.

    Bad idea for a few reasons, worst case scenario would be carbon monoxide from the garage getting into the house and killing someone.
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    Yo motoguy its probably already been said by this...

    Yo motoguy its probably already been said by this point but the larger indoor coils have a higher saturation temperature which means it’s more efficient but less comfortable due to its inability to...
  47. Thread: rotobrush

    by Wild
    Replies
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    4,015

    After reading that editorial it sounds like using...

    After reading that editorial it sounds like using a roto brush to clean out the ducts isn't worth it. But let's say a duct system if full of cat hair and the people living there are alergic to cats....
  48. Yeah, that's what happens when you increase the...

    Yeah, that's what happens when you increase the gas. But then the readings should stabilize, not continue to rise or fall. I doubt he'll test again for you though.
  49. If he comes back and has his analyzer maybe you...

    If he comes back and has his analyzer maybe you could have him test the furnace again. Then watch the CO and O2 readings as it goes through the heating cycle and into second stage. And have the gas...
  50. If the refrigerant lines are accessible it’s my...

    If the refrigerant lines are accessible it’s my preference to go ahead and replace them even if they are the right size.

    In any case.

    What size is the suction line?

    What is the total...
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