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  1. Replies
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    In the service business, it really is about 360....

    In the service business, it really is about 360.

    Since it is seasonal, the business plan should take into account the spring and fall business shoulders.

    Bankers like to see profitability in a...
  2. Replies
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    4,880

    As so many here have put it, your business owner...

    As so many here have put it, your business owner hat must grow to match your technician hat.

    How many new installs and how many service calls a year to run the business? How do you divide the 250...
  3. Replies
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    1,955

    The requirement is for hardpipe even in...

    The requirement is for hardpipe even in non-seismic areas.

    If the tubing is pushed into the edge of the cabinet, the flex is not strong enough to prevent dents and leaks.

    A household with kids...
  4. Hard start kit on the heat pump?

    Hard start kit on the heat pump?
  5. The new HVAC may be more sensitive to waveform...

    The new HVAC may be more sensitive to waveform distortion than the old HVAC.

    You might try to add more linear load to the generator by turning on more old-style electric lights.

    If you have a...
  6. Replies
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    2,318

    shophound You're totally w... , no, wait,...

    shophound

    You're totally w... , no, wait, can't argue with you.

    But let me add, uh, uh, nothing to add.

    Dang.
  7. Replies
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    23,627

    Thanks, mik597, good stuff to know.

    Thanks, mik597, good stuff to know.
  8. Replies
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    23,627

    Marvin Besides getting rid of scale, what...

    Marvin

    Besides getting rid of scale, what other maintenance is there unique to the Freus?
  9. Replies
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    23,627

    mik597 Thanks for taking the time to post...

    mik597

    Thanks for taking the time to post hints and kinks on the Freus.

    The filter trick is a good one.

    What controls did you change out, high or low pressure or other?
  10. Replies
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    2,064

    Check out the residential applications at Florida...

    Check out the residential applications at Florida Solar Energy Center:

    FSEC-PF-337-98
    FSEC-CR-1475-04

    Different roofs measured in Cocoa, Florida.
  11. Replies
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    2,064

    There's no doubt that white metal roofs work in...

    There's no doubt that white metal roofs work in hot climates. A number of folks have taken data including Florida Solar.

    There is a combination of things going on which includes heat absorbed, and...
  12. Replies
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    3,793

    Not harming the roof. Forget whether that was...

    Not harming the roof.

    Forget whether that was measured by FSEC or someone else, but the temperature rise was 5 deg F.

    But offset that by reducing the inside attic temperature, and overall...
  13. Poll: Short answer, yes. With the typical Plano...

    Short answer, yes.

    With the typical Plano house, it needs radiant barrier. With composite shingles and OSB roof sheathing, additional thermal mass in the attic should be minimized.

    If you put...
  14. Poll: It is 97% clean and out of the box. Really more...

    It is 97% clean and out of the box. Really more like 85% radiation blocking. It will payback for you. If you put in the radiant barrier, the load calculations should be adjusted for it.



    The...
  15. Replies
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    517

    What bootlen said. 1. Get a Manual J for heat...

    What bootlen said.

    1. Get a Manual J for heat and cooling load. Manual D and Manual T for ducts and terminals. Then you will know what it needs to be.

    2. If you don't have radiant barrier, get...
  16. Replies
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    Manual D and Manual T.

    Manual D and Manual T.
  17. Replies
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    3,793

    The emissivity of a radiating surface runs from 0...

    The emissivity of a radiating surface runs from 0 to 1, with 1 fully radiating. Plywood has an emissivity of about .85, and the radiant barrier about .15.

    Broadside to the surface is maximum...
  18. Replies
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    3,793

    This may seem counter-intuitive, adding the...

    This may seem counter-intuitive, adding the insulation may have increased the heat holding capacity of the attic. Before you added the insulation, did your A/C shut off about midnight? This summer is...
  19. Replies
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    1,436

    Sorry about your discomfort. It would be best...

    Sorry about your discomfort.

    It would be best not to mention "lawyer" to the builder until they quit cooperating. The system is geared to protect the builder, not the homeowner.

    There may have...
  20. Replies
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    Supposedly Manual J overestimates the load a...

    Supposedly Manual J overestimates the load a little.

    Reduced cooling at high temperatures, and sensible to total heat, those kind of factors belong in the Manual S calculations.

    At least in my...
  21. Replies
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    7,662

    You do understand the fan curve for an ECM?

    You do understand the fan curve for an ECM?
  22. Replies
    49
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    7,662

    My copy of Manual D has 15 boot fittings with...

    My copy of Manual D has 15 boot fittings with equivalent lengths.

    Manual D was written before the laptop computer was available. Fittings were given equivalent lengths for ease of computation....
  23. The first thing that comes to mind is the gallons...

    The first thing that comes to mind is the gallons per minute rate of the heater. You would need to figure the Btu/hr needed and see if you have enough water flow to transfer enough heat.

    The next...
  24. Replies
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    692

    Soda straw effect. Which component has the...

    Soda straw effect.

    Which component has the most drag on the whole system? If already limited by compressor or evaporator, then improving the condenser will not have a noticeable effect.

    TXV is...
  25. Replies
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    4,069

    The reason someone hires a tradesman is 1) the...

    The reason someone hires a tradesman is 1) the trade will do it right, 2) the trade will do it more efficiently, 3) the trade is likely to have specialized tools to speed and do the job properly. As...
  26. Manual J is the procedure used to calculate the...

    Manual J is the procedure used to calculate the heating and cooling needs per room and total house.

    Manual D is the procedure used to calculate the duct sizing to each room and returns. Duct size...
  27. PVC and sheet metal have different friction...

    PVC and sheet metal have different friction coefficients. Your Manual D will show that.
  28. Replies
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    Sorry, this is not a DYI site.

    Sorry, this is not a DYI site.
  29. Anyway, if on International Residential Code see...

    Anyway, if on International Residential Code see M1411.3; or if on Uniform Mechanical Code see 310.1-.5.
  30. Replies
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    Have you looked into a shipboard system, through...

    Have you looked into a shipboard system, through marine suppliers?
  31. Replies
    6
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    1,080

    Two different things going on here. One is...

    Two different things going on here.

    One is that with metal cases, they must be grounded. A loose wire, or a wire cut, making contact with that metal case is lethal. With the case grounded, a short...
  32. Replies
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    But other than that, Mrs. Lincoln, how did you...

    But other than that, Mrs. Lincoln, how did you enjoy the play?
  33. WD-40 contains kerosene, I think. Not my first...

    WD-40 contains kerosene, I think. Not my first choice for range, oven, or furnace.
  34. Replies
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    You might want perforated if the foil is fastened...

    You might want perforated if the foil is fastened to a wood product such as plywood or OSB. Otherwise it makes no difference. It is not necessary to tape the joints - really a waste of time.
    ...
  35. Replies
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    441

    Lokring Tube Connection

    Wondering if anyone has used this or similiar crimp-type connection, and if so, any problems or comments?
  36. RX11 is supposed to be nontoxic and nonflammable....

    RX11 is supposed to be nontoxic and nonflammable.

    Xylene is highly flammable and causes neurological damage.

    Toluene at high levels causes kidney damage.

    Think that I'd rather take care of...
  37. Replies
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    If it's the correct capacitor running in the...

    If it's the correct capacitor running in the specified temperature range,

    then, the capacitors are bad from the supplier, or
    they are getting overvoltage somehow.
  38. Replies
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    The other constraint here is the water...

    The other constraint here is the water temperature of 10*C. You can add heat easily to that, but not take too much heat out without freezing it.

    Smaller water temperature drop means higher water...
  39. Replies
    10
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    791

    Don't think that's big enough. When you get...

    Don't think that's big enough.

    When you get your tonnage figured out convert it to Kwh. For example, 27,304 Btu hr is 8 Kw. The spec you show is up to 5 Kw for some conditions.

    Spec sheets for...
  40. Replies
    10
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    791

    One of your big tradeoffs is going to be the heat...

    One of your big tradeoffs is going to be the heat exchanger. The dip-brazed manufactured heat exchangers can get pricey. It is possible to make your own coaxial heat exchanger. Another option is to...
  41. Replies
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    6,762

    Best advice is a local attorney. One of the...

    Best advice is a local attorney.

    One of the precincts here has a judge who owned an electrical contractor firm. Best judge to go to for deadbeats.

    Generally best not to get the deadbeat mad....
  42. It's not real clear what problem you are wanting...

    It's not real clear what problem you are wanting to solve. Is it a comfort problem? Is it a too high electric bill?

    $'s on the electric bill doesn't tell us much. How many kwh's did you use in a...
  43. Replies
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    So are you going to credit your customer for the...

    So are you going to credit your customer for the $150 tax rebate you lost him?
  44. Maybe this is the sort of list that you are...

    Maybe this is the sort of list that you are looking for. It is an inspector list, not a contractor list.

    Heating systems. The inspector shall:

    (1) report the type of heating system and its...
  45. His question has been answered, it's just not the...

    His question has been answered, it's just not the answer he would want.

    Unless the inspector holds a HVAC ticket or PE ticket, visual looksee for equipment is as far as it goes. That's as far as...
  46. In his opinion. Is there a breach of duty if...

    In his opinion.

    Is there a breach of duty if the inspector doesn't inform the client of a heat exchanger problem? I would argue no, unless the inspector has a technician license for HVAC, or has...
  47. The best tool for an inspector is the exceptions...

    The best tool for an inspector is the exceptions standard wording on the printed form for the report. To the effect of we don't offer an opinion as to pest control, HVAC, foundations in expansive...
  48. Thread: Curious

    by sparksandfan
    Replies
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    1,319

    Well, Paul, that's about to change on Sep 1,...

    Well, Paul, that's about to change on Sep 1, 2008. Code inspections will be required in all new home and remodeling projects in unincorporated areas in Texas. That's per 10 TAC 307.1-.7.

    The...
  49. Replies
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    540

    No upfront hardware costs saved. The compressor...

    No upfront hardware costs saved. The compressor is moved indoors. The air heat exchanger and fan are replaced by a water heat exchanger and pump.

    That leaves the cost of drilling, slurry if any,...
  50. Flow velocities below 2 feet per second will not...

    Flow velocities below 2 feet per second will not move air bubbles in a vertical pipe. Flow velocities above 4 feet per second will increase noise. Faster velocities increase pump power needs.
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