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  1. Replies
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    It's unknown if they are properly bonded together...

    It's unknown if they are properly bonded together but if he was getting shocked it's a good chance they are not bonded. Just guesses at this point.

    No amount of ground rods and bonding copper...
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    "Which might work but only adds complication...

    "Which might work but only adds complication which could be eliminated by powering the defrost timer motor in parallel with the compressor." this would have clock stop when compressor is powered down...
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    885

    My idea was to initiate the clock on a low temp...

    My idea was to initiate the clock on a low temp stat. Like a heatpump do.
  4. Any heat will help, though.

    Any heat will help, though.
  5. Replies
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    885

    Power the clock motor through a defrost stat,...

    Power the clock motor through a defrost stat, close on fall.
  6. canyt figure the subcooling figure will do you...

    canyt figure the subcooling figure will do you any good on a captube system.
  7. Is this an evaporative cooling tower? Can you...

    Is this an evaporative cooling tower? Can you bypass the tower? Pump energy would add heat while no heat loss to outside. But be carefull to circulate enough tower water to keep from freezing...
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    when I have a real tough RTU to squeeze on a...

    when I have a real tough RTU to squeeze on a roof, I will build models to check clearances. Further, I can give this to the installer so they know exactly how it shoiuld look.
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    Do a scale mock up on graph paper. Or do a 2-D...

    Do a scale mock up on graph paper.

    Or do a 2-D using cardboard sections glued together with a hot glue gun. lap cardboard "ducts" together. Use this as a pattern to transfer to the metal.
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    Where is the energy saved? Compressor running...

    Where is the energy saved? Compressor running through out the cooling season vs. chill water cooling plus a little bit of resistance heating in January. Fiqure 10 to 1 ratio on efficience on...
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    Cold air will condense without adequate vapor...

    Cold air will condense without adequate vapor barrier and cause a mold problem. Return air plenums must now also be duct material, at least in these parts. I think it has to do with Chinese drywall.
  12. Replies
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    1,396

    Bad neutral will do that. Was the house peir and...

    Bad neutral will do that. Was the house peir and beam?
  13. Thread: Cmon Man

    by timjimbob
    Replies
    11
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    737

    You aren't dumping liquid into compressor.. It is...

    You aren't dumping liquid into compressor.. It is being metered through the small maifold parts and shrader valve, being diluted by warm returning suction line gases and flashing when it expands when...
  14. Ran into a problem with HP and low inside...

    Ran into a problem with HP and low inside temperature. Coil was not clearing ice because there was not enough sensible heat, inside. Defrost was not getting it done. Throws COP off when defrost is...
  15. Not all bad news. Use charge to purge lines...

    Not all bad news. Use charge to purge lines during brazing and leak check.
  16. Replies
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    Indoor humidity should not be any different from...

    Indoor humidity should not be any different from last years situation, Heat doesn't alter RH with different types of systems.

    As forcomplaining customer, I will install OA stat and review defrost...
  17. Replies
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    Record cold here with icy drizzle. Heat output...

    Record cold here with icy drizzle. Heat output might be low, but everything checks out ok when I look.

    No amount of explaining "warmer then room air" is heating the house but may feel cool to the...
  18. Replies
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    How HP works, to a HO

    Any published papers explaining how a HP heat the room, but does not blow hot air?

    I have a customer driving me crazy. i cannot convince her that the HP IS working and heating to set point, just...
  19. Thread: grounding ?

    by timjimbob
    Replies
    25
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    2,077

    open neutral will often result in a low volt on...

    open neutral will often result in a low volt on one side of 120volt and a correstonding hi voltage on other side of 120 volt.

    Like this: read 90 volt on one plug and 150 volt on a second 120 volt...
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    219

    blown fuse (closed thread)

    i feel we need to make the HO aware that the inspection of the disconnect is part of a air conditioning inspection. The issue with a burnt fuse will result in a ruined compressor or possible fire....
  21. Figure 33" furnace + 29" coil. 5 ton coil . Too...

    Figure 33" furnace + 29" coil. 5 ton coil . Too much!
  22. Figure 33" furnace + 29" coil. 5 ton coil

    Figure 33" furnace + 29" coil. 5 ton coil
  23. need advise in tight replacement furnace

    I am looking for a very short furnace/evap combo for Horizantal application.

    Think I may need to have return enter side or back of blower cabinet, but not bottom.

    All suggestions considered.
  24. Now how would you know with one year of use!!!

    Now how would you know with one year of use!!!
  25. Replies
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    York CU, I believe, have one shot service valve. ...

    York CU, I believe, have one shot service valve. They do not close off refrigerant flow.
    Question #1- Backseating servive valve will only isolate CU side of refrigerant system. You will still have...
  26. Fiberglass needs a very good vapor seal else...

    Fiberglass needs a very good vapor seal else water will get behind it and porur out. I like armorflex better. Closed cell.
  27. Replies
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    double checkgas pressure through-out the firing. ...

    double checkgas pressure through-out the firing. I've had a leaky, gas line going to the house that had water in it and took on water. very dynamic and dependant on other appliances.
  28. Replies
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    What is "combustion pressure" ? Is it off?

    What is "combustion pressure" ? Is it off?
  29. Replies
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    1,159

    Refrigerated cases dumped heat into space year...

    Refrigerated cases dumped heat into space year around. Assuming the CU were inside space.
  30. steel pipes need insulation. They will rust.

    steel pipes need insulation. They will rust.
  31. Replies
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    Think RA needs to be bigger. good Sheet metal...

    Think RA needs to be bigger.

    good Sheet metal shop can figure a matchup. I f you really can't figure a curb adapter, you can use side discharge and field build the connections
  32. Sweating pipes in a Chws retrofit is a problem. ...

    Sweating pipes in a Chws retrofit is a problem. Very hard to make them drip free.
  33. Compressors use refrigerant charge to cool the...

    Compressors use refrigerant charge to cool the compressor motor. Lack of adequate freon charge will overheat the compressor motor. That is one reason why.
  34. Replies
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    Are we talking 8 feet? 3.5kw, what is that in...

    Are we talking 8 feet? 3.5kw, what is that in BTUs?

    Size of CU connection has no bearing on pipe size.

    Sorry, I still not up to speed.
  35. Have a #??model

    Have a #??model
  36. Replies
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    i had a powered, 24VAC, duct heater feeding into...

    i had a powered, 24VAC, duct heater feeding into the AHU. stat wires were crossed at thermostat Rc-Rh link. 24 volt were then jacked up to 480 volts through contro transformer.
  37. Replies
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    Screws may be covered with little plastic white...

    Screws may be covered with little plastic white cover that pop off.
  38. Replies
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    If you study the schematic, you will probably see...

    If you study the schematic, you will probably see a clear path on how the voltage is feeding to the zero leg.

    I've posted this at other post. Never assume there is no danger if you pull all three...
  39. Replies
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    471

    Look for tic marks on plastic housing. A paint...

    Look for tic marks on plastic housing. A paint can lid remover can pop the catch. Make sure to take air filter out.
  40. Replies
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    1 watt=3.4 btus..always

    1 watt=3.4 btus..always
  41. Replies
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    Whether it is a hair drier, television, a motor...

    Whether it is a hair drier, television, a motor connected to nothing, or heating element, The equal watts consumed will produce the same amount of heat into the room.
  42. Replies
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    Expect to pay a few hundreds of dollars. It is...

    Expect to pay a few hundreds of dollars. It is pretty labor intensive on an already built house. There are companies that is all they do.
    You may not realize that every window and door needs to be...
  43. Thread: subcooling

    by timjimbob
    Replies
    35
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    1,252

    So, are you saying higher subcooling DOES NOT...

    So, are you saying higher subcooling DOES NOT increase efficiency?
  44. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,252

    I am having a hard time uinderstanding why high...

    I am having a hard time uinderstanding why high subcooling adds to efficiency. I appreciate the explanations, but I just can't get this.
  45. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,252

    just a theororist

    just a theororist
  46. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,252

    I am incorrect

    I am incorrect
  47. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,252

    You also have zero superheat too. let say .001...

    You also have zero superheat too. let say .001 degree of subcooling
  48. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,252

    you say ".......you are undercharged" No, you...

    you say ".......you are undercharged" No, you are perfectly charged in a perfect world. You add positive superheat as a margin of safety, to insure there is no flashing going on.

    Do you see this...
  49. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,252

    If you have zero subcooling, that means no...

    If you have zero subcooling, that means no flashing.. Any flashing in the evap is what you want. Any flashing before the TXV would then be some superheat.
  50. Replies
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    I realize you are talking about cooling. I...

    I realize you are talking about cooling. I apologize fot the critique
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