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  1. Replies
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    You didn't try shampoo?? Sure seemed logical.

    You didn't try shampoo??

    Sure seemed logical.
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    Yes, thanks for the update. Sounds like you're on...

    Yes, thanks for the update. Sounds like you're on the right track.
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    588

    A prepared tech has multiple leak detection...

    A prepared tech has multiple leak detection devices and procedures. Keeping it simple; you either smell, hear, see or feel the leak. Most often it's a combination of these.

    Smelling it, hearing...
  4. Thread: CFM question

    by penderway
    Replies
    14
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    354

    Right, now I'm confused between "current" system...

    Right, now I'm confused between "current" system and proposed system.

    Guess we'll sort it out later..
  5. Thread: CFM question

    by penderway
    Replies
    14
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    354

    Furnace is being replaced by a heat pump fan/coil...

    Furnace is being replaced by a heat pump fan/coil unit.
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    938

    I should also reveal that I provide a five year...

    I should also reveal that I provide a five year parts and labor warranty on all my repairs. If I mis-diagnose micro leaks and it turns out to be another type of leak, I credit the cost of the...
  7. Thread: CFM question

    by penderway
    Replies
    14
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    354

    The engineering (if documented) will show the...

    The engineering (if documented) will show the predicted T.E.S.P. (total external static pressure) at the design speed setting.

    Unless your had actually measured 1200 CFM with your old furnace I...
  8. Thread: CFM question

    by penderway
    Replies
    14
    Views
    354

    I assume you are keeping your oil fired furnace,...

    I assume you are keeping your oil fired furnace, and replacing the AC coil with a heat pump coil, and adding an electric heater in the duct.

    In the past oversizing equipment was the status quo. So...
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    938

    If you only have micro leaks... your pump, (mine...

    If you only have micro leaks... your pump, (mine is 7cfm) will evacuate at a faster rate than the leak intake rate. I have no problem achieving 400 microns (after most the moisture is pulled out)....
  10. Replies
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    It will fix formicary corrosion (micro leaks) in...

    It will fix formicary corrosion (micro leaks) in evaporators.... It won't fix any other type leak in any other place.
    It will lockup a compressor with moisture in the crankcase.... It won't lockup...
  11. Thread: subcooling

    by penderway
    Replies
    73
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    1,781

    I've read somewhere that for each degree of...

    I've read somewhere that for each degree of subcooling you add without raising the high side pressure is equal to a .5% system efficiency increase. This wouldn't apply to heat pumps in AC mode, as...
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    1,034

    :D yes.... CYA

    :D yes.... CYA
  13. Replies
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    1,034

    Doesn't look like any drip eliminator I've ever...

    Doesn't look like any drip eliminator I've ever seen. I'm not understand how a louvered grille would prevent dripping. Am I missing something here? Something not seen in the picture?

    Does...
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    4,994

    Medic, see my post here...

    Medic, see my post here.
  15. Replies
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    1,034

    X4 (or is it 5 now) If you haven't washed the...

    X4 (or is it 5 now)

    If you haven't washed the coil yet, you should. If one type of cleaner doesn't work then use another.

    Advice given is good, follow it.
  16. Replies
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    4,994

    When I do an install, I perform a room by room...

    When I do an install, I perform a room by room Manual J load calc, select equipment by the Manual S procedure and design the duct system with the Manual D. Confirm charge, airflow and balance the...
  17. Thread: No Superheat

    by penderway
    Replies
    13
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    452

    which would really make it a condenser :)

    which would really make it a condenser :)
  18. Thread: No Superheat

    by penderway
    Replies
    13
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    452

    Just to clarify... a vapor can be superheated and...

    Just to clarify... a vapor can be superheated and a liquid can be subcooled. But not visa versa.
  19. Thread: No Superheat

    by penderway
    Replies
    13
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    452

    0 superheat means saturation. Saturation means...

    0 superheat means saturation. Saturation means the vapor has no more room to contain the refrigerant as a vapor only (superheated)

    There could be a tiny droplet of liquid and the rest vapor OR a...
  20. Replies
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    1,450

    I've never considered digital gauges because I...

    I've never considered digital gauges because I just cannot live without seeing that needle move on the analogs. Don't get me wrong, I crave accuracy, I use 1%ers and regularly check them with a...
  21. Replies
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    1,450

    iManifold is the future, all the rest will just...

    iManifold is the future, all the rest will just try and catch up

    The analog gauge graphics are a plus to me
  22. Replies
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    757

    That is some hot water, Have you amped the water...

    That is some hot water, Have you amped the water pump, any way to verify proper water flow?

    BTW whose app is that?
  23. Replies
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    Looks good. I'd guess you had 0 SC at the TXV...

    Looks good.
    I'd guess you had 0 SC at the TXV before adding, and prolly 4 SC after. Is the evaporator also higher than the compressor, or LL running thru a very hot attic?. That could account for...
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    2,144

    X2, if you're serious about getting the...

    X2, if you're serious about getting the moisture/refrigerant out thoroughly and fast, use a heat gun and a rubber mallet (for no rusty scratches later on).
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    Those numbers are in normal range. I'd say your...

    Those numbers are in normal range. I'd say your at least ok at mild OD temps.


    http://efficientcomfort.net/tempImg/eval1.jpg


    I made some assumptions: @910 supply sCFM:

    ...
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