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  1. From the Installation Manual

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
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    Duct inside 2x4 Wall Cavity

    So you pros say:
    "Do you realize that you get less airflow out of pipe that is ovaled? "

    So if I have an 8' tall 2x4 x 14.5" wall cavity (3.5" deep) and I don't use 6" oval to go with 6" round in...
  3. Thread: Cold air return

    by wraujr
    Replies
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    1,391

    My apologies, sorry for bad posting. I have same...

    My apologies, sorry for bad posting. I have same setup and contractor used turning vanes which I would think have more effect than 5" of duct. I should have started a new thread asking which is...
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    Had one where burner needed a good cleaning,...

    Had one where burner needed a good cleaning, especially the crossover portion as the flame wasn't crossing to the third burner fast enough. Every time I cleaned sensor it worked for a while, I guess...
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    1,586

    Dumb Question..

    Heres a question (from a non-tech)...
    If you're adding charge to compensate for the lineset length, then wouldn't the velocity of the refrigerant remain the same no matter how long the line set??
  6. Thread: Cold air return

    by wraujr
    Replies
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    1,391

    Turning Vanes

    How about having contractor install "turning vanes" in the elbow???
  7. Think of it This Way

    For a forced-air furnace or AC to operate it must have a certain amount of air flowing across the heat exchanger or condenser. Yes, with newer units it could be variable with a certain range, BUT...
  8. Thread: Hornet's Nest

    by wraujr
    Replies
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    989

    Nothing is Perfect

    No Licensing/Inspection/Law/Control system is perfect.

    Drivers run stop signs and red lights all the time.
    Licensed contractors perform poorly and break code all the time.

    BUT, imagine how...
  9. Thread: Dual-Fuel?

    by wraujr
    Replies
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    1,156

    "when natural gas goes up so does electricity in...

    "when natural gas goes up so does electricity in most regions"

    Agreed as there are plenty of NatGas fired power plants.
    However I wonder if the home consumer is subject to the price spikes due to...
  10. Thread: Dual-Fuel?

    by wraujr
    Replies
    24
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    1,156

    As a side note, I consider burning NatGas furnace...

    As a side note, I consider burning NatGas furnace to be more "green" than Heat Pump.
    Why???
    Because I am burning it at 95% efficiency (plus energy to distribute)
    When electricity is generated...
  11. Thread: Dual-Fuel?

    by wraujr
    Replies
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    1,156

    Yes, thats a good question. And almost...

    Yes, thats a good question. And almost impossible to determine with the data I have.
    What I can say is that in all heating months I analyzed, Oct thru April, the NatGas was cheaper. Even the...
  12. Thread: Dual-Fuel?

    by wraujr
    Replies
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    1,156

    Five Years of Data

    I am in mid-Atlantic in MD a little north of VA.
    I have 5 years of utility data, commodity and delivery costs.
    Analyzed Nat Gas vs. Heat Pump (not Dual Fuel) and so far have found Nat Gas to be...
  13. Thread: Mold?

    by wraujr
    Replies
    2
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    428

    Mold?

    Is this mold growing in new equipment??
    If so should I be worried??
    Basement has had some minor flooding (2").

    226062
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    Very fine emory cloth followed by alcohol wipe. ...

    Very fine emory cloth followed by alcohol wipe. Flame sensor was still going strong after 8 years of pre-season cleaning....
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    Here's something I've always wondered, but been...

    Here's something I've always wondered, but been too lazy to get out my voltmeter... When the tstat makes a call for heat or cool, does it also engage G and make a "matching" call for fan or is G...
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    What Happens Next

    OK, call for 3/4 stage heat and blower shuts off, BUT what happens next....??
    Does furnace goes thru it lighting sequence??
    Do burners eventually come on???
    After some warm-up period, does blower...
  17. You said: "why would the (almost) instantaneous...

    You said: "why would the (almost) instantaneous reading of the room temperature change "

    You are assuming the tstat is displaying the "instantaneous" room temp. It is not. It is rounding based...
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    Excellent. I'll post back in a few days.

    Excellent. I'll post back in a few days.
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    Hey BeenThere, Since you have access to COP...

    Hey BeenThere,

    Since you have access to COP data and you might have a favorite performer...

    Do you have COP data for say

    16 SEER Heat Pump (any vendor but lets keep SEER at 16 or should I...
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    1,623

    It is tough trying to do the right thing. ...

    It is tough trying to do the right thing. Especially since there are techs that have been venting to the atmosphere for years or the venting from leaking coils. I myself had a unit that went thru 6...
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    So to clarify. All you want: Tech come to...

    So to clarify.

    All you want:
    Tech come to house that is less than 5 miles from his office.
    Hook up and remove charge (he has to pay to dispose).
    Cap off lineset in case you reuse (involves time...
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    Hey BT, go easy on him I think he might be a...

    Hey BT, go easy on him I think he might be a relative of yours... :)
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    Have you checked condensate drain??

    Have you checked condensate drain??
  24. Replies
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    2,169

    Just realized, Spreadsheet does have avg temp for...

    Just realized, Spreadsheet does have avg temp for each month from utility bill. So if I had a way (formula or table) to convert avg temp to a COP. I could compare monthly instead of a single COP...
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    How Prices Have Flucuated

    Here's the complete graph from 2007 thru Jul 2011.
    Note that this is Cost to Produce 1 Million BTUs using "delivered" rates from an actual utility bill

    217622

    As you can see in 2008, duel fuel...
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    "The BTU output of a heatpump is not a constant...

    "The BTU output of a heatpump is not a constant value "
    Yes that is true, but unless you had a fully instrumented house measuring usage and OD temp, one needs to use as "average" COP to have any...
  27. Replies
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    Data was taken from utility bill and entered in...

    Data was taken from utility bill and entered in Excel each month.
    Looked at NatGas usage in therms.
    Used data from summer months to create average usage for hot water/cooking. This was subtracted...
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    2,169

    Not really comparing xL16i, comparing using COP...

    Not really comparing xL16i, comparing using COP of 3.5.
    So any heat pump acheiving 3.5 would compare to NatGas as follows

    217582

    Notable events, after 2008 NatGas prices dropped.
    In 2010,...
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    Historical Data

    Installed new xL16i (AC) with XV95 NatGas Furnace at end of 2008.
    At the time had utility bills on file back thru 2007. At time of purchase toyed with dual-fuel. Decided to just stick with...
  30. Replies
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    2,169

    So if Trane xL16i with AHRI 4385663 Certificate...

    So if Trane xL16i with AHRI 4385663
    Certificate only has Region IV HSPF Rating Heating: 9.00
    Does this translate to anything?

    ADDED: So i averaged Highs/lows from Nov thru March and got 39.1F
    ...
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    So, say 3.1 was correct and I used 3.5, I would...

    So, say 3.1 was correct and I used 3.5, I would be favoring the heat pump?
  32. Replies
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    Average Heat Pump COP for Mid-Atlantic

    So I have 3 years of utility data and I am comparing NatGas vs. Heat Pump.
    I am in mid-Atlantic, Maryland an hour south of Lancaster, PA.
    For Heat Pump, I know that COP varies with outdoor temp....
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    Looks better than the 15 year old coil I had...

    Looks better than the 15 year old coil I had replaced.
    Looks similar to other coils I've seen (very limited experience)
    On my coil, those support pieces are made of galvanized metal, not aluminum...
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    Think twice before calling him back out. He...

    Think twice before calling him back out.
    He couldn't fix it right the first time, what makes one think he'll be any smarter or competent, the second time.
    From your description, he's a...
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    Question??? Before asking for a Manual D or S or...

    Question???
    Before asking for a Manual D or S or whatever, there must be some tests that the OP could ask for that a tech could vist and perform. Ones that come to mind are (probably wrong terms):...
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    1,377

    You said" "and also let the installer who sold me...

    You said" "and also let the installer who sold me the unit know he did not comply with our request for the quietest unit - which we were willing to pay for."

    You should absolutely follow this...
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    I have a question?? OP specifically said 2...

    I have a question??

    OP specifically said 2 stage heat EXCHANGER (as in high efficiency furnace) and then asks about efficiency.

    The * answers seem to be about 2-stage heat (i.e. low fire and...
  38. Replies
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    Consumer protection??? Come on be realistic.....

    Consumer protection??? Come on be realistic..
    First of all based on this:
    http://www.residential.carrier.com/products/acheatpumps/ac/comparison.shtml
    You got the loudest unit in the group, plus no...
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    This is not advice. This is knowledge....

    This is not advice. This is knowledge.
    Transformers can run at all different temps.
    Usually related to how much current is flowing.
    They can be cold, warm, and yes even hot.
    This is not an...
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    For learning, read through a manufacturer's...

    For learning, read through a manufacturer's installation manual.
    Starting on page 9 is a discussion on "Air for Combustion and Ventilation"
    216952

    Note that this manual is public, available by...
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    1,540

    How many people live in unit?? Any pets??

    How many people live in unit??
    Any pets??
  42. Replies
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    1,540

    When you measure 1700 ppm indoor, what do you...

    When you measure 1700 ppm indoor, what do you measure when you go ouside on your balcony??? You need the ambient or outdoor ppm to compare against...
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    Besides verifying all the vents and fans, try the...

    Besides verifying all the vents and fans, try the following:
    Make sure bathroom fan is OFF, dryer is OFF, range hood is OFF.
    Turn on the ventilation fan and set speed control to high (thats the...
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    So, look near your refrigerator and you should...

    So, look near your refrigerator and you should find:
    "grille pour ventilation" (see legend) which is a "ventilation grill"
    You will see on the diagram, the evenly dashed line connecting it to the...
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    1700ppm this morning?? Is your unit directly...

    1700ppm this morning??
    Is your unit directly above a parking garage??
    You don't appear to have any gas/oil/propane appliances?

    Wait a minute... Are you talking CO2 (carbon dioxide) or CO...
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    1,540

    If you look behind panel above washer you should...

    If you look behind panel above washer you should find your fan.
    Yes the arrows on the diagram do indicate that the SHOULD all be pulling...
    If you find the fan, mabe there is a common exhaust...
  47. Replies
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    Possibly dryer, but diagram shows it connected to...

    Possibly dryer, but diagram shows it connected to conduit (duct) for the bedroom/living room ventilation. There is a separate dashed line showing the passive (no fan) dryer vent.
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    Google tells me look above the washer for a...

    Google tells me look above the washer for a "porte d'acier coupe feu" which translates to steel fire door, behind which you may find your circulating fan
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    Blueprint

    Here's what I see from blueprint.
    In addition to whats already been said

    There appears to be a passive vent from the rear of your refrigerator to the vent on the "curved" balcony. My guess is to...
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    ACR is used for air conditioning and...

    ACR is used for air conditioning and refrigeration, its wall thickness is around 1/32"
    Type K is thick, can be used for underground water lines feeding a house although Type L which is thinner is...
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