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  1. Replies
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    478

    Henry oil level control location

    Dear fellows:
    All the racks Ive worked on use the same Henry oil level control attached to the Discus crankcase. Nevertheless, all the system manuals Ive had access to indicate that the oil level...
  2. Factory remanufactured compressors question

    Dear fellows:

    My boss owns a shrimp packing business overseas, down in Central America. He explained to me that over there, due to import and freight costs, factory remanufactured compressors from...
  3. Replies
    5
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    802

    how wet means flooded ?

    Dear fellows:

    Each time a compressors gets flooded with liquid refrigerant, it turns cold and very wet and sweaty.
    But some other times, due to proximity between the large and normally cold...
  4. Thank you for the comments Nik. Just one doubt:...

    Thank you for the comments Nik. Just one doubt: how come one of the fans usually ends up running backwards ?
  5. HEPA filters ans laminar flow diffusers pressure drop

    Hi Guys:

    I'm not really too much in commercial duct design. I most of the time work in refrigeration racks, so forgive my ignorance. Here is the case: as part of the remodeling of a commercial...
  6. Replies
    5
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    760

    Compressor gasket ste

    Dear fellows:

    I detected a too low differential oil pressure in one of the compressors. The DP oil switch and sensor were tested according to manufacturer's instructions and are OK. I took away...
  7. Replies
    13
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    1,093

    I am checking all posible causes you guys...

    I am checking all posible causes you guys mention. I'll keep you informed.

    About the SORIT maintenance I performed: I really go beyond just replacing the O rings contained in the kits, which I...
  8. Replies
    13
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    1,093

    Hi Markettech. Thank you for your interest. In...

    Hi Markettech. Thank you for your interest.

    In this rack, the alarm is triggered by a liquid level switch located near the bottom of the vertical reciever. I guess it must be a float type device....
  9. Replies
    13
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    1,093

    Receiver liquid level alarm

    I have been very busy in the last few days opening, blowing and oiling several SORITs and TXVs belonging to a refrigeration rack. Thanks God they are all working fine now: temperatures are really...
  10. Replies
    2
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    699

    Water pump bushing removal

    Dear fellows:

    I am in the process of overhauling a very old condensate water pump in a cooling tower circuit. I don't even know yet what brand of pump it is. What I do know is that the shaft is...
  11. Replies
    1
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    1,179

    Megohmmeter readings

    Dear fellows:

    Does anyone of you is familiar with using megohmeter insulation testing on Copeland Discus compressors? I know for sure that some techs around here do that as part of a preventive...
  12. Replies
    5
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    2,169

    Bare sheet metal duct condensation

    Dear fellows:

    Not long ago I fired up a system consisting of five 30-ton Lennox self contained dooling units. As the sheet metal ducts run exposed in the air conditioned area, there was no need...
  13. Replies
    2
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    568

    Tyler rack communication question

    Dear fellows:

    I am trying to put back in service the remote communication link of an 8-year old Tyler low T rack. The control panel manual requires a modem speed of 9600 (quite slow by today's...
  14. Replies
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    970

    Copeland Discus 15HP compressor overhauling

    OK fellows,

    I decided to follow your advice and not use this baby for other than educational purposes. But since the company owner does not want to send me to a tear-down workshop ( he says that...
  15. Replies
    10
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    970

    15 HP Copeland Discus overhauling

    Dear fellows:

    In order to have a spare compressor for emergencies, I am trying to overhaul an old 15 HP Copeland Discus compressor which suffered an burnout. I have a few questions for you rack...
  16. Thank you for your interest in this subject. ...

    Thank you for your interest in this subject.

    As I was present at the time the compressor burned out, and closed all valves right after, I suppose contamination got contained mostly inside the...
  17. Replies
    9
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    1,104

    Two Phase Condition

    Dear fellows:

    Is it possible for a three phase scroll compressor to start and run on two phases electrical power supply? Would it just overheat and activate the internal overload device shortly...
  18. Ref Rack 15 Hp Discus Compressor Burnout Cleaning

    Dear fellows:

    Thank you for your clues regarding the causes leading to the compressor burnout. Now, about the cleaning: what would be the best solvent to get rid of all the carbon and dirt left in...
  19. Copeland 15 Hp Discus Compressor Burn Out

    Dear people:

    A 15 HP Copeland Discus compressor in a medium temperature rack recently tripped the 90A breaker which protects the circuit. Continuity test with an ammeter did not indicate a short...
  20. Replies
    8
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    1,210

    Commercial size dehumidifier

    Dear fellows:

    Does anyone know about a central type dehumidifier that could be used in a 10-ton commercial system installed in a SPA ? I have seen these portable dehumidiers before, but I think...
  21. Tyler air cooled condenser in marine environment

    Dear fellows:

    A Tyler med-low temperature rack I just visited is located less than a mile from the beach. Some spots of the air cooled condenser are almost without any fins. Is there any special...
  22. Replies
    2
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    455

    evaporator / condenser missmatch

    Dear fellows:

    I have calculated a cooling load of about 6 tons for a rural cafeteria There is no 3-phase power around there, just single phase. I now for sure that the 3-phase blower motor of a...
  23. Refrigerant charge estimation in rack systems

    Dear fellows:

    Could someone give some advice on the correct method for estimating the refrigerant charge in a supermarket R-22 parallel rack system ? I think I can calculate the amount of...
  24. Replies
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    3,875

    Leak detection methods

    Dear fellows:

    Of all the different kinds of leak detectors in the market, which one do you consider to be the best for everyday usage: torch type, electronic sniffer type or ultrasonic ? Also,...
  25. Replies
    5
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    1,005

    Supermarket rack compressor overhauling

    Dear fellows:

    Even if the semi-hermetic compressors of a low temp R-22 rack do not break down, how often should they be overhauled ? What components should be replaced as part of a preventive...
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