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Type: Posts; User: jvrba

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  1. Replies
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    1,083

    What should my pressures be on a heat pump with...

    What should my pressures be on a heat pump with the following conditions:

    oa 68, return temp 78. oarh 62%
    discharge temp 55
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    966

    Is this a tract home with similar houses in the...

    Is this a tract home with similar houses in the neighborhood?
    If so check out your neighbors see if they are having problems? If not make a comparison...
    Just a thought....
  3. I've heard of a algecide tablet replacement...

    I've heard of a algecide tablet replacement system (I believe they use UV lights). Would this not kill the bacterica on the coils?
  4. Thread: MC-20 GARD-PAK

    by jvrba
    Replies
    15
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    5,587

    Mr. wizard...I have 36 of these units on my Trane...

    Mr. wizard...I have 36 of these units on my Trane compressors and for the most part they work ok. However when the motor winding resistors on the compressors fail (ie. have a resistance value over...
  5. Thread: MC-20 GARD-PAK

    by jvrba
    Replies
    15
    Views
    5,587

    Does anyone know how to jump out the Robertshaw...

    Does anyone know how to jump out the Robertshaw MC-20 Gard-Pak/Motor protector? My Trane compressors use this *&$% junk as a safety to protect the compressor. Its an oil pressure/ motor winding...
  6. Thread: VAV vs VVT

    by jvrba
    Replies
    23
    Views
    37,099

    triton, what is the maximum bypass percentage? ...

    triton, what is the maximum bypass percentage? If your floor is satisified what percentage will bypass?
    Here's another one: What is the difference CAV VVT?
  7. Thread: AHU V-belt wear

    by jvrba
    Replies
    3
    Views
    1,980

    Good question. I've heard the same thing with...

    Good question. I've heard the same thing with VFD's or soft starts changing your belts once a year. However I've examined my belts and change them on a as needed basis.
  8. Replies
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    2,427

    drsuperheat, what if the condenser is sealed? I...

    drsuperheat, what if the condenser is sealed? I have Carrier units that use sealed shell and tube condensers.
    I've been very leary about using acid on these 22 yr old machines. You are right when...
  9. Replies
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    2,427

    wasp you are correct, these are the same machines...

    wasp you are correct, these are the same machines SWUW6004.
  10. Replies
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    2,427

    Which do you recommend: 1) Nylon brushing...

    Which do you recommend:
    1) Nylon brushing of the tubes?
    2) Chemically cleaning (mild Acid)?
    3) If nylon brush doesn't work, polishing tubes
    with steel buffing tool
  11. Replies
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    35,773

    You mean to tell me that if you have any liquid...

    You mean to tell me that if you have any liquid present you will not have any subcooling/superheat? That is the definition right?
  12. Replies
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    1,182

    Wasp I'll try and get you up-to-date readings for...

    Wasp I'll try and get you up-to-date readings for the units.
    I believe all the controls are original. ga1279 all readings were taken with the unit fully loaded and the hot gas bypass closed...
  13. Thread: steam boiler

    by jvrba
    Replies
    14
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    1,445

    paulj are you sure your not smoking the hemp? ...

    paulj are you sure your not smoking the hemp?

    I've used both teflon and pipe dope on low pressure and sometimes a mixture of both. There are some very good pipe dopes on the market right now by...
  14. Thread: HVAC Graphics

    by jvrba
    Replies
    17
    Views
    12,012

    Graffic pic's of Mechanical equipment (especially...

    Graffic pic's of Mechanical equipment (especially animated) on the web would be very cool. I have Siemens appogee system with really lame pic's...although they tell me that I can download better...
  15. Replies
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    1,031

    Do you mean leaking duct work? No really do...

    Do you mean leaking duct work?
    No really do you mean a drop in 2x2 perforated grill?
  16. Replies
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    1,182

    Wasp, like I said, some units have only one...

    Wasp, like I said, some units have only one operational unloader, the newer units come with two. We have checked the hot gas bypass valve and coils and they work fine. The pressures I stated before...
  17. Replies
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    1,182

    more info....These are Recips with options for 2...

    more info....These are Recips with options for 2 electric unloaders. although most of the machines have only one. The unloaders are controlled by suction pressure. However all measurements where...
  18. Replies
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    1,182

    Sorry folks, The units were built in 1978. They...

    Sorry folks, The units were built in 1978. They are water cooled, with supply water temps hanging around 80. The return air temps range between 74 and 76 and supply air during the summer is 53 to...
  19. Replies
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    1,182

    Can anyone tell me the manufactures suggested...

    Can anyone tell me the manufactures suggested operating pressures, Temperatures for this type compressor? I have two 30 ton compressors in my SWUW6004. At present they run a suction pressure around...
  20. Replies
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    2,548

    Maxster, your right about the torrevent. I...

    Maxster, your right about the torrevent. I assumed that this unit was a SWUA but a much later version (ie. the "W" instead of "A"). These units also have problems with oil migration. The...
  21. Replies
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    1,192

    Aren't you glad engineers design our mechanical...

    Aren't you glad engineers design our mechanical systems...
  22. Replies
    20
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    2,548

    The existing machines are R-22, condenser water...

    The existing machines are R-22, condenser water cooled units. I'd like to say it was a SWUA 600, but alas tis not so. These units seem to be built ups. Compressor section with water cooled...
  23. Replies
    1,275
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    114,578

    These guys are giving you alot of good advice. ...

    These guys are giving you alot of good advice. The real fact of the matter comes down to how much are you willing to spend. I gone both ways, engineered drawing calcs etc the whole ball of wax, and...
  24. Replies
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    2,548

    Yes the unit goes inside. It is a water cooled,...

    Yes the unit goes inside. It is a water cooled, 60 ton A/C unit. We have a cooling tower on the roof.
  25. Replies
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    Does anyone know of a package unit or a breakdown...

    Does anyone know of a package unit or a breakdown unit that will fit through a standard doorway? I need 60 tons of cooling. I'm replacing the 1978 model Trane unit (SWUW6004). I have exisiting...
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