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  1. Thread: grounding ?

    by timjimbob
    Replies
    24
    Views
    779

    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...
  2. Replies
    1
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    164

    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....
  3. Figure 33" furnace + 29" coil. 5 ton coil . Too...

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

    Figure 33" furnace + 29" coil. 5 ton coil
  5. 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.
  6. Now how would you know with one year of use!!!

    Now how would you know with one year of use!!!
  7. Replies
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    223

    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...
  8. 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.
  9. Replies
    11
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    522

    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.
  10. Replies
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    473

    What is "combustion pressure" ? Is it off?

    What is "combustion pressure" ? Is it off?
  11. Replies
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    543

    Refrigerated cases dumped heat into space year...

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

    steel pipes need insulation. They will rust.
  13. Replies
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    408

    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
  14. 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.
  15. 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.
  16. Replies
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    377

    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.
  17. Have a #??model

    Have a #??model
  18. 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.
  19. Replies
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    397

    Screws may be covered with little plastic white...

    Screws may be covered with little plastic white cover that pop off.
  20. 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...
  21. Replies
    10
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    397

    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.
  22. Replies
    11
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    486

    1 watt=3.4 btus..always

    1 watt=3.4 btus..always
  23. Replies
    11
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    486

    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.
  24. Replies
    96
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    1,909

    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...
  25. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,052

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

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

    by timjimbob
    Replies
    35
    Views
    1,052

    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.
  27. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,052

    just a theororist

    just a theororist
  28. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,052

    I am incorrect

    I am incorrect
  29. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,052

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

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

    by timjimbob
    Replies
    35
    Views
    1,052

    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...
  31. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,052

    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.
  32. Replies
    21
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    754

    I realize you are talking about cooling. I...

    I realize you are talking about cooling. I apologize fot the critique
  33. Thread: subcooling

    by timjimbob
    Replies
    35
    Views
    1,052

    subcooling

    I attended a copeland seminar and puzzled by the statement that a higher subcooled liquid has more capacity then 10 degree subcooling liquid.

    I realize that heat is absorbed more readily when...
  34. Replies
    21
    Views
    754

    Only run HP if temperature is above 60?!!! You...

    Only run HP if temperature is above 60?!!!

    You need solid data and an understanding about heatpumps.

    I have plenty of buildings that do not have suplemental strip heat at all and are heated all...
  35. Replies
    7
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    400

    Just to be sure and not screw up someone elses...

    Just to be sure and not screw up someone elses recovered 50 lb jug of R22, they are not the same. Just similiar characterisics. NEVER MIX REFRIGERANTS
  36. Thread: Hot loop

    by timjimbob
    Replies
    8
    Views
    370

    I had that happen with a couple of chillers and...

    I had that happen with a couple of chillers and 300,000 sq foot high rise. Rupture discs blew the charge of all the chillers. Not a quick fix. Pump motor watts is converted to heat.
  37. Thread: Why Now?

    by timjimbob
    Replies
    16
    Views
    861

    Which high limit? Could be change in the flue. ...

    Which high limit? Could be change in the flue. could be bad heat exchanger
  38. I use a chart record. Hard copy Shows when and...

    I use a chart record. Hard copy Shows when and what temperature. This is not remote, though.
  39. yes, I had a situation where the inside...

    yes, I had a situation where the inside temperature was kept in the low 60s. The available sensible heat was determioned not be enough to clear the outside coil before unit shifted out of defrost.
  40. Replies
    19
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    1,172

    I'll try accummulator wrap. Easiest to do now.

    I'll try accummulator wrap. Easiest to do now.
  41. Replies
    10
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    398

    Charles, you have checked many items that have no...

    Charles, you have checked many items that have no connection with blown control fuses. Are you sure you know what you are doing?
  42. Replies
    10
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    398

    You can guess or fuse all loads with 1 amp fuses....

    You can guess or fuse all loads with 1 amp fuses. Too many choices
  43. Replies
    19
    Views
    1,172

    SH is at compressor. Very short distance from...

    SH is at compressor. Very short distance from evap to comp.= 4-5 feet.

    since cap tube is burried in foam insulation, I can't tell if cap wraps around suction, but I will check at CU location. My...
  44. Replies
    19
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    1,172

    cap tube location matter

    I am having a problemwith a True freezer and slow recovering temp. running about 5 degrees warmer, in the day, then I'd like. 20 degree SH.

    I changed the cap tube with an equivelent sized cap...
  45. The number on WRoger stat is probably the series...

    The number on WRoger stat is probably the series line. The exact madel no. is on the inside. You would be quite supprised as to the long no. and all the variations there are.

    Most likely, if...
  46. Thread: dry cold air

    by timjimbob
    Replies
    6
    Views
    479

    dry cold air

    I read that the supply air, at outlet to evap, is 100% saturated. I always thought that the air at that point was very dry. The fact that the evap was producing condensate.

    I haven't looked at the...
  47. Finding a home depot thermostat with reset...

    Finding a home depot thermostat with reset button will be impossible. I have never seen a reset button on a stsat.


    replacing a stat on a heatpump is not a home owner job. You must understand...
  48. Replies
    36
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    1,382

    Need to keep a sawzall on the truck

    Need to keep a sawzall on the truck
  49. Replies
    36
    Views
    1,382

    I wonder about the mentality of Trane engineers...

    I wonder about the mentality of Trane engineers that have the CU plastic bottom pans secured to the pallets. You need a wood chisel to cut theese loose. I already have a problem with three...
  50. Replies
    27
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    1,572

    I wish the Copeland "old fart" would read ...

    I wish the Copeland "old fart" would read "Copeland Air Conditioning Training Manual

    Application Engineering Bulletin AE-1301, and AE 1316. Two different opinions.
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