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Type: Posts; User: refpro021702

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  1. Replies
    2
    Views
    519

    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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    820

    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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    788

    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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    1,204

    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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    1,204

    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
    Views
    1,204

    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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    731

    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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    1,232

    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
    Views
    2,330

    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
    Views
    595

    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
    10
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    1,071

    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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    1,071

    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
    Views
    1,176

    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
    Views
    1,303

    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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    484

    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
    28
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    4,179

    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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    1,050

    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...
  26. Hermetic compressor system oil charging

    Dear people:

    I am about to start up a single compressor 5 HP low temp refrigeration system. The piping lines are quiet long, about 80 linear feet plus fittings and valves. There are also a couple...
  27. supermarket parallel compressor low temp rack burnout

    Dear fellows:

    In these parallel compressor racks, whenever we have a single compressor burnout, since they share common suction, discharge and oil return piping manifolds with the remaining...
  28. oil addition in long line applications

    Dear fellows:

    Most manufacturers list on their equipment installation manuals the right amount of refrigerant per foot that must be added in order to get the right charge. But what about the...
  29. standard manifold sight glass question

    Dear fellows:

    My supervisor just gave me a new nice looking manifold. It`s of the standard non-digital type. The only new feature I have noticed is that a sight glass is included in the middle of...
  30. Replies
    2
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    2,409

    Copeland Discus compressor de-assembly

    Dear fellows:

    I need to tear down a 15 HP Copeland Discus compressor. It is mechanically locked but not burned. Does anyone know about a website where I could get assembly diagrams / bolt-screw...
  31. Replies
    15
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    1,087

    ductless system piping question

    Dear fellows:

    I`m installing five of those ductless ceiling mounted evaporators. The condensers are right behind the wall, but at a lower level. For such a case, good suction piping practices...
  32. fixed superheat type expansion valves

    Dear fellows:

    I am having some trouble getting the right superheat / subcool values for a YORK 10 ton system. The factory-installed expansion valves are of the non-adjustable fixed superheat cheap...
  33. duct system for twin 5-ton cooling units

    Dear people:

    I need to install a system with a total capacity of 10 tons. Due to cost limitations, I am planning to install a single duct system, designed to handle about 4000 cfm, connected to...
  34. Replies
    5
    Views
    1,546

    Two stage DX cooling coil question

    Dear fellows:

    Recently, a field inspector asked me to install liquid line solenoid valves at the liquid inlets of a DX two-stage cooling coil. Could anyone explain to me the reason for this? Are...
  35. Replies
    2
    Views
    776

    Tyler rack question

    Dear fellows:

    I just got in charge of a low temperature R-22 Tyler rack refrigeration system. It has 8 parallel compressors. All of them have factory supplied suction line cartridge filters. Do I...
  36. Replies
    13
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    2,276

    service valve brazing

    Dear fellows:

    I am having problems getting a sound braze on a 5-ton condensing units service valves. I am following the manufacturer`s instructions regarding the use of wet rags while brazing, but...
  37. Replies
    9
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    3,528

    water cooled condenser scale removal

    Dear fellows:

    Could someone please advice me on the correct method for de-scaling a water cooled condenser? If it is really done with a solution of phosphoric acid, what are the proportions of the...
  38. Replies
    5
    Views
    668

    WATER CCOLED AHUs TRIPPING ON START

    Dear fellows:

    I have inherited a problem from a friend tech: a system of 14 TRANE AXIOM water cooled 5-ton AHUs, most of them tripping on system start up. The sequence of the problem goes as...
  39. Replies
    8
    Views
    800

    I must said that the classrooms have an...

    I must said that the classrooms have an independent outside air injection system, which includes a pre-cooler coil, that is suppose to keep proper ventilation rates. I think that the board members...
  40. Replies
    8
    Views
    800

    IAQ for classrooms question

    Dear fellows:

    I just recently finish the installation of some ductless mini-split systems in a elementary school. Everything working fine so far. Now I wonder what should be the best way to...
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