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  1. Where are you in N.VA?

    Where are you in N.VA?
  2. Replies
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    Nutone (Nordyne, Nortek) does not make a variable...

    Nutone (Nordyne, Nortek) does not make a variable speed outdoor unit in 1/2 tonage sizes. Are your talking about a variable speed AHU?

    Either way, I'd look for the best contractor you can find and...
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    A 2ton a/c is 24k btus nominal. About 3/4 of that...

    A 2ton a/c is 24k btus nominal. About 3/4 of that is its sensible capacity. So, if you're coming up with 10k sensible and your a/c can produce 18k sensible, then there's one of two explanations:
    ...
  4. There's no way anyone can guarantee how long it...

    There's no way anyone can guarantee how long it will take for the system to leak down to the point where its performance will be affected. Also, not knowing your locale, we don't know how long your...
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    How did they know the old one wasn't over-sized?...

    How did they know the old one wasn't over-sized? The vast majority of them are.
    Being more efficient means that less heat is wasted up the chimney and goes into the house instead. That means that...
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    I'd leave it like it is - assuming the furnace is...

    I'd leave it like it is - assuming the furnace is properly sized. Was a load calc done?
  7. Fix-a-flat is for tires, not refrigeration...

    Fix-a-flat is for tires, not refrigeration systems. Anyone that wants to use that instead of finding the leak and properly repairing it is not a competent tech.
    Like the old-timers used to say:...
  8. With only one zone and the circ PROPERLY sized...

    With only one zone and the circ PROPERLY sized for the head of both the boiler and the zone, then yes, that would work. With multiple zones, then no, p/s is required because of the varying flow in...
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    " 8/7/15 - Installed new blade (vibrating badly...

    " 8/7/15 - Installed new blade (vibrating badly upon arrival), found compressor not running, out on thermal overload, after compressor came out of thermal overload, checked pressures 88/258, amps ok,...
  10. How large is the house? 399k btus is huge for the...

    How large is the house? 399k btus is huge for the boiler. The average house only needs 50k btus or less. So, unless your house is extremely large or leaky, or both, the boiler may be well over-sized....
  11. Delta T too low; suction too high: Too much air...

    Delta T too low; suction too high: Too much air flow or pulling in attic air.
  12. A 20* delta t is an ideal number. Meaning the...

    A 20* delta t is an ideal number. Meaning the equipment is working fine. That doesn't mean it producing ENOUGH cooling to match the LOAD. Nor, does it mean that the duct system is delivering enough...
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    Most residential systems never need the TXV to be...

    Most residential systems never need the TXV to be adjusted and many are non-adjustable. Either way, correct sub-cooling must be obtained before considering the superheat.

    The fitting with the...
  14. They should have done a load calc. Also, be...

    They should have done a load calc. Also, be advised that your master bedroom are will have a greater temperature swing than the rest of the upstairs because it's exposed on five sides - even if...
  15. The dealer may be including purchasing an...

    The dealer may be including purchasing an extended labor warranty with the product. Some will only sell new equipment that way.

    There is no difference between the brands other than the badge and...
  16. The dealer may be including purchasing an...

    The dealer may be including purchasing an extended labor warranty with the product. Some will only sell new equipment that way.

    There is no difference between the brands other than the badge and...
  17. If you are not properly trained and licensed,...

    If you are not properly trained and licensed, then what you're doing is illegal and subject to a heavy fine.

    As noted above, site rules prohibit giving DYI advice.
  18. Thread: Nutone 2.5 ton

    by bobboan
    Replies
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    190

    No superheat? Sounds like it's over-charged. It...

    No superheat? Sounds like it's over-charged. It won't cool properly if it is.

    You said nothing about supply duct sizes. I'd confirm that your duct sizes, cfm and load calc are correct.

    You can...
  19. Thread: Coil frosting

    by bobboan
    Replies
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    303

    That may work, but it would be inefficient and...

    That may work, but it would be inefficient and there would be a capacity loss.

    Can you speed up the blower to get more cfm? Regardless of age, it still should have been sized for around 400 cfm...
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    New hybrid unit

    It's the new MayFridge. Available exclusively from Bob's Heating & Cooling.

    This custom model was the only one available. We got a Frigidare to swap with a Maytag on a quality assurance warranty....
  21. I'd have to get into the service manual for that...

    I'd have to get into the service manual for that particular unit to know that code. It's different for each unit; no way to know them all.

    You would still need a tech on site with tech support on...
  22. 'Dirty power" refers to distortion or noise in...

    'Dirty power" refers to distortion or noise in the wave pattern of a.c.
    Your Fuji is an inverter driven unit which means the inverter converts a.c. to d.c. so the speed of the compressor and fan...
  23. Did the tech take any voltage or amperage...

    Did the tech take any voltage or amperage readings with the unit at full load? If so, what were they? If not, why not?
  24. Replies
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    IF you have input the correct data, then trust...

    IF you have input the correct data, then trust the math. But, that's a big IF.
    Is your duct work in the attic? If so, then you need to add 15-20% to your calc.
    I would make the contractor that you...
  25. Thanks for following up and letting us know. I...

    Thanks for following up and letting us know. I hope there are no more immediate problems.
  26. Replies
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    Did you overlook "C" above?: c (1) :...

    Did you overlook "C" above?:
    c (1) : characterized by or conforming to the technical or ethical standards of a profession (2) : exhibiting a courteous, conscientious, and generally businesslike...
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    Not quite so Beenthere: a : of, relating to,...

    Not quite so Beenthere:

    a : of, relating to, or characteristic of a profession
    b : engaged in one of the learned professions
    c (1) : characterized by or conforming to the technical or ethical...
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    "Done by a Pro". It doesn't look professional....

    "Done by a Pro".

    It doesn't look professional. Just because he got paid to do it, doesn't mean he's a pro.
  29. A general, but not absolute rule in this...

    A general, but not absolute rule in this business: if your looking for quality and expertise (especially in hydronics), it's usually in the smaller shops; the larger ones are geared more towards...
  30. I'm late to the party, but may I add my two cents...

    I'm late to the party, but may I add my two cents worth?

    1. Your expansion tank is definitely too small for a converted gravity system with cast iron rads. It should probably be at least an Extrol...
  31. Scratch and dents are obviously sold by the...

    Scratch and dents are obviously sold by the distributor for less. Many times, I've helped customers who were strapped for cash get a new unit with full warranty for a lot less because it's cosmetic...
  32. A lot depends on your location, weather, how well...

    A lot depends on your location, weather, how well the unit is sized to match the load, etc.

    Generally speaking, if the setback is only for a few hours, there is little or no savings and comfort is...
  33. Can you post some pics of the furnace as well as...

    Can you post some pics of the furnace as well as the vent termination?

    The quality of the workmanship, or lack thereof, would be a significant factor in determining whether this has been an honest...
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    Was a combustion analysis done with a digital...

    Was a combustion analysis done with a digital analyzer when the boiler was commissioned? I don't see how it could have been with the gas line issue.
    When was the last time the heat exchanger was...
  35. Replies
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    If it's 14* outside and you're heating the inside...

    If it's 14* outside and you're heating the inside to 64*, that's a 50* temp difference (aka Delta T). If it's taking 10kw to do that, and the OD temp dropped to -65*, that would be an additional 79*...
  36. Replies
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    As far as I know, none of us on here can read...

    As far as I know, none of us on here can read minds so we don't know why you're being told you need 20kw. Not trying to be a smart A,we just have no way of knowing.

    The only way to accurately...
  37. Replies
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    The both will produce the same amount of heat...

    The both will produce the same amount of heat from the same amount of energy. 100% efficiency simply means that none of the energy is wasted in the process. It doesn't mean that the cost for the...
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    You really need to see what your cost per...

    You really need to see what your cost per kilowatt is up there and then compare that to what the cost for LP or oil is to get the same btu's. There are on line calculators that will do this. You just...
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    Reverse return gives equal flow at each emitter...

    Reverse return gives equal flow at each emitter as well as the same supply temp to each one. This way each rad will give it's rated output for the given water temp. Doing it in series causes each rad...
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    Series loops cause the return water from the...

    Series loops cause the return water from the first rad to be the supply water for the second, etc. Each seceding rad thus receives cooler water and will have less output. This has to be accounted for...
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    SlantFin has a free heat loss program that you...

    SlantFin has a free heat loss program that you can download. It's very easy to use.
    If you're gonna err, do it by over sizing the baseboards PROPORTIONATELY in each room. That will allow for a lower...
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    How many btu's per square foot? - How long is a...

    How many btu's per square foot? - How long is a peice of rope? Not trying to be funny, but that's how vague your question is.

    As others have already stated, a detailed heat loss calculation needs...
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    A soon to be candidate for a Darwin Award! You...

    A soon to be candidate for a Darwin Award! You just can't fix stupid.
  44. Replies
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    The SpiroVent will eventually remove all air that...

    The SpiroVent will eventually remove all air that passes through it - even micro bubbles. One of the great mysteries is water's ability to absorb air at its surface and transport that air downward. I...
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    He's only a shell of what he once was.

    He's only a shell of what he once was.
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    Or just put a ball valve or even a 1/2" gas cock...

    Or just put a ball valve or even a 1/2" gas cock on the air outlet. That way you could use it to vent the initial amount of air if the system's been drained and then close it off.

    I do this on...
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    Just to put things into perspective: the design...

    Just to put things into perspective: the design temp for Kingston is 2*. If we say that your house needs 35 btu's per square foot at that temp, which is being extremely liberal, that would come to...
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    An accurate heat loss calc involves taking all...

    An accurate heat loss calc involves taking all the components of the envelope (walls, floors, ceiling, windows, doors, etc) and calculating their heat from engineering data. This requires detailed...
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    That's a very good boiler, but choosing the right...

    That's a very good boiler, but choosing the right installer is MUCH more important. Did whoever quoted this boiler do a heat loss calculation such as a Manual J? If not, how do you know you need...
  50. That's an average of almost 36 btu's per square...

    That's an average of almost 36 btu's per square foot. The best floor output that can be reasonably expected is about 25 btu's per square foot before issues arise. That's usually a slab floor with no...
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