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  1. Replies
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    I agree with the last posts regarding the...

    I agree with the last posts regarding the returns not being sealed. Another possibility is building leakage around things like can lights, electrical boxes, exhaust fan enclosures...etc. If there...
  2. There is no need for the return in there unless...

    There is no need for the return in there unless someone put it there because your ductwork is undersized and it needed the extra air. There are better ways to address that.

    You did not mention...
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    Block off the exhaust - not the intake pipe. ...

    Block off the exhaust - not the intake pipe.

    Good call on closing registers to increase SP

    A combustion analyzer (if you are using it to see if there is an O2 change when the blower comes on)...
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    My 2000 sq ft house has a cooling load of 1.5...

    My 2000 sq ft house has a cooling load of 1.5 tons - you are not going to get a return call if you ROT a 3.5 to 4 ton price at me. Just sayin.....

    I get the whole "quote over the phone" thing for...
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    If it is truly power vented, then the termination...

    If it is truly power vented, then the termination should not make a difference but then it would also not make much sense that the problem started after re-roofing. Type B vent is also not the...
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    Strictly speaking from the combustion heating...

    Strictly speaking from the combustion heating side - I remember quite a while back there was some testing done and conclusions made. I was told years ago that you could save 1%/degree/8hrs. Set...
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    It is not uncommon to have pressures in the...

    It is not uncommon to have pressures in the building that are negative with reference to the outside when an air handler is operating. Could be due to duct leaks or door closure issues. So it is...
  8. Loonie and Heybob are correct. THe unit has to...

    Loonie and Heybob are correct. THe unit has to be rated for mobile home use. The Carrier unit needs to be modified to handle the high static duct system. Modular and manufactured housing are...
  9. Thread: lawyer joke?

    by 7X
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    1,234

    Why can't lawyers use Viagra? Makes 'em too...

    Why can't lawyers use Viagra?

    Makes 'em too tall.
  10. Replies
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    swnoel - I agree and wish you well.

    swnoel - I agree and wish you well.
  11. Replies
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    Wptski posted: "A bit off topic but my sister...

    Wptski posted:

    "A bit off topic but my sister was getting headaches and finally figured out that they only came after doing her laundry! The furnace, water heater and dryer are all gas in that...
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    No, the codes didn't change. I have an AGA...

    No, the codes didn't change. I have an AGA publication from (I believe) 1990 that details the changes in the furnaces and addresses changes in venting, including tables. Venting instructions were...
  13. I think much of what has been said is valid. I...

    I think much of what has been said is valid. I am just going to summarize some of it. Condensation on the windows is a function of the temp of the windows and the amount of moisture in the house. ...
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    High vent temp and low air temp rise? Is the...

    High vent temp and low air temp rise? Is the inside of the heat exchanger sooted up?
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    A couple things to look at might be duct leakage...

    A couple things to look at might be duct leakage and proper air flow. Kind of hard to tell if the insulation is proper with a blower door. IR camera would be better.
  16. Thread: dye test kit

    by 7X
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    1,120

    Be aware that this test has some limitations -...

    Be aware that this test has some limitations - seeing past the first bend on a tubular heat exanger...etc. Also need to consider heat exchanger construction. Some heat exchangers are built with an...
  17. Thread: dye test kit

    by 7X
    Replies
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    1,120

    http://www.visibledefects.com Out of Missouri...

    http://www.visibledefects.com

    Out of Missouri I think.
  18. I'm with Loonie on duct issues and air flow. ...

    I'm with Loonie on duct issues and air flow. Make sure there are no leaks - particularly from the garage. The air flow thing is huge - if the furnace is cycling on the limit switch, that could...
  19. Thread: furnace question??

    by 7X
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    9,481

    Tchntch mentioned durability - that's something...

    Tchntch mentioned durability - that's something that I don't think is being talked about enough in this discussion. While the properly sized furnace should run all the time at design temp, it does...
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    Yes, it's possible you could have had an...

    Yes, it's possible you could have had an intermittent problem with the mixing valve. If it happens again, I would have it serviced.
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    Good thought on the dip tube. The reason I asked...

    Good thought on the dip tube. The reason I asked about the instantaneous heater is because I was wondering why you have a mixing valve in the first place. Is it really necessary with your system?
  22. Replies
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    Is this an instantaneous heater? If you are...

    Is this an instantaneous heater? If you are somewhat mechanical, maybe you can feel the pipe going to the mixing valve from the tank. If it is always nice and hot and the water coming out of the...
  23. Thread: furnace question??

    by 7X
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    9,481

    This has been a pretty entertaining thread. ...

    This has been a pretty entertaining thread.

    Trane, thanks for summarizing what appears to be the latest point of contention. It is always a good idea to point out where we agree versus disagree. ...
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    My vote is for electric backup also. I am not a...

    My vote is for electric backup also. I am not a big fan of propane appliances installed below grade. The thought I had was to find out if your electric utility will give a rebate for going all...
  25. Thread: furnace question??

    by 7X
    Replies
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    9,481

    Maybe Deejoe is approaching this from a job...

    Maybe Deejoe is approaching this from a job security perspective. Two six minute cycles at ten degrees outside? (Doesn't seem like a very real world example - must not run at all when its fifty...
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    Here's another thought to follow what Brendan is...

    Here's another thought to follow what Brendan is saying in regard to negative pressures. If the return runs through the space in which the appliance is located, when the filter gets dirty the leaks...
  27. Thread: fan & limit

    by 7X
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    1,051

    Another interesting thing about not clipping the...

    Another interesting thing about not clipping the clip is that if the limit was intended to be 24 VAC and the secondary on the transformer is not grounded, nothing would burn up, the system will work...
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    I have caught a lot of nice browns when I used to...

    I have caught a lot of nice browns when I used to live in Colorado. Browns are nocturnal. Best fishing I have found is between 10:00 at night to 2:00 in the morning. Woolybuggers are fine or even...
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    One more thought: your upper opening can't be...

    One more thought: your upper opening can't be another pipe run up from the crawlspace. I know - it sounds stupid, but I just saw this recently.

    Maybe a better idea is to bring in dedicated...
  30. Replies
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    Sorry, I should have been clearer. Brentplumb...

    Sorry, I should have been clearer. Brentplumb mentioned that the furnace could vent out the water heater draft hood if the vent was blocked. Also, if the vent is not sized or configured correctly,...
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    One thing that wasn't mentioned here that I see...

    One thing that wasn't mentioned here that I see alot is the wrong configuration of the wye. With newer appliances, it is common to see things like 4x4x4 wyes. The larger appliance needs to go...
  32. Thread: Air Infiltration

    by 7X
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    1,790

    My two cents. I also think it is a good idea to...

    My two cents. I also think it is a good idea to know where you are starting from and where you end up as far as infiltration goes. A blower door test in conjunction with an infrared camera is a...
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    Wow, Wormy - scary. shophound - you mentioned...

    Wow, Wormy - scary.

    shophound - you mentioned tagging the valve. I tagged and even padlocked a three phase disconnect to an overhead crane I was working on in Connecticut. Went on break - came...
  34. Replies
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    Roboteq - I have had other reps tell me the same...

    Roboteq - I have had other reps tell me the same thing and, conceptually, I don't have a problem with it, but what I am wondering about is whether there is too much variance in the amount of leakage...
  35. I'm kind of with Bill on this one. I am in a lot...

    I'm kind of with Bill on this one. I am in a lot of houses that seem like they need a humidifier but would be ok with just a little modification. If you have excessive infiltration due to duct...
  36. Replies
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    Had one like this recently. Sooting began at the...

    Had one like this recently. Sooting began at the first bend of the primary like you said yours is doing. Found that even though the rings were ok, the crimps were not. Plug the outlet of the vent...
  37. Replies
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    Kudos MechAcc. What a detailed answer. ...

    Kudos MechAcc. What a detailed answer. Appreciate the time input for that.
  38. Replies
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    After I posted this, I realized it was intended...

    After I posted this, I realized it was intended to be inserted into the conversation much earlier. Oh well.

    Noel addressed what temp rise is. The temp rise can be adjusted by changing blower...
  39. Thread: Cycling of furnace

    by 7X
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    Doc gave good advice. It is likely cycling on...

    Doc gave good advice. It is likely cycling on the limit switch but having a supply temp would verify it. This will damage the furnace and double your utility bills. Sounds like you still need more...
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    No, those numbers are not ok. Oxygen number is...

    No, those numbers are not ok.

    Oxygen number is huge. Should be down somewhere around 6% to 9%. Stack temp is low. Underfiring is contributing to the high O2 number, but other factors can figure...
  41. Thread: Elementary Humidity

    by 7X
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    1,827

    Well stated responses Carnak and Xavier.

    Well stated responses Carnak and Xavier.
  42. Replies
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    Vern P - could you please give me the specific...

    Vern P - could you please give me the specific reference in NFPA 90 in regard to the 3" requirement? Thanks.

    I may be missing something here. NFPA 54 2002 8.3.1.5 states: "Make-up air...
  43. Replies
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    Not enough is being said about what Fleth...

    Not enough is being said about what Fleth mentioned. If the new furnace is moving a lot more air, then the depressurization effect from interior door closure can be substantial. This is very common...
  44. Thread: Two Turtles

    by 7X
    Replies
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    1,551

    Boycott shampoo! Demand REAL poo! I'll admit...

    Boycott shampoo! Demand REAL poo!

    I'll admit I don't get it either.
  45. Thread: Two Turtles

    by 7X
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    1,551

    A turtle jumps off the end of a tree branch only...

    A turtle jumps off the end of a tree branch only to crash to the earth at the base of the tree. The turtle climbs back up the tree and jumps off the branch again with the same result. Again and...
  46. Thread: New vent material

    by 7X
    Replies
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    11,171

    Yes, it has been repaired.

    Yes, it has been repaired.
  47. Thread: vent terminations

    by 7X
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    No, not the same guy. Two other houses in more...

    No, not the same guy. Two other houses in more rural areas of the great State of Indiana
  48. Thread: New vent material

    by 7X
    Replies
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    11,171

    Large 2-story inner city house whose occupants...

    Large 2-story inner city house whose occupants felt they could not afford to have a pro look at it. Homeowner repair. Obviously did not know what they were doing. Was wrong about length of time it...
  49. Thread: New vent material

    by 7X
    Replies
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    11,171

    Not sure, but believe at least a heating season. ...

    Not sure, but believe at least a heating season. The vinyl is more melted than it looks in the pic. I think what is keeping it from excessive heat is that the flue products don't actually vent - as...
  50. Thread: vent terminations

    by 7X
    Replies
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    3,050

    Tried to post these once before, but not sure it...

    Tried to post these once before, but not sure it worked. One is a hub from a four wheel drive Chevy with holes drilled in it and the hubcap used as the cover - found on a mobile home furnace. The...
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