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  1. It is a great option for any system that sees a...

    It is a great option for any system that sees a wide swing in required btu capacity with accompanied power savings. The digital scroll steps capacity from 10-100%. The main thing is you have to have...
  2. They are used a lot in commercial refrigeration...

    They are used a lot in commercial refrigeration applications on parallel racks since 2006 or so
    Carrier is including them in their new line of high efficiency a/c's. I don't think it's available yet...
  3. and then when you have been in it (the trade)...

    and then when you have been in it (the trade) long enough--you see the same OLD thing come back around with new branding. Its bad when you can tell a new crop of engineers just hit the work force...
  4. I have highlighted some of these manuals with...

    I have highlighted some of these manuals with yellow in the Table of Contents as to where the info can be found.
  5. Ok, guys here are the files for your information....

    Ok, guys here are the files for your information.

    Just remember the 6.5 ton compressors with the ASTP feature have a big pretty tag on the compressor to give you a heads-up.

    The smaller scrolls...
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    I disagree. What is the line temp on the leaving...

    I disagree. What is the line temp on the leaving liquid line going to tell you??

    That there is subcooling,,,,that has no bearing on the liquid level present in the receiver tank..

    If you...
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    If you are trying to establish a level, this is...

    If you are trying to establish a level, this is simple one way to do so. .
  8. Replies
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    One way to check the receiver if there is no...

    One way to check the receiver if there is no sight glass is to heat the receiver with a map gas from bottom to top and then slide your finger from the bottom to top until you feel a change in heat....
  9. There is a feature on the ZP compressor line from...

    There is a feature on the ZP compressor line from Copland it is tagged on the compressor with a large tag labeled "ASTP". This is a feature that separates the scroll plates based on discharge...
  10. Hey guys,,,concerning compressors in residential and commercial A/C units

    There is a discussion on the board: "is bad compressor or 4-way valve?"

    I wanted to touch on that subject.

    A lot of the manufactures equipment incorporates a Copland scroll compressor, and I...
  11. Replies
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    2,852

    i dunno, all those retiring that the nurses will...

    i dunno, all those retiring that the nurses will take care of will need their cooling!
  12. Thread: Wages In DFW

    by Mkgjr77
    Replies
    21
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    1,979

    DFW local union wage 24.35 per hour to the tech...

    DFW local union wage 24.35 per hour to the tech around 34.00 with all benefits.

    Carrier commercial service is union/merit shop. 5 years ago they were paying around 27 -29 dollars per hour to the...
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    in my area (DFW- East Texas) RN's have it hands...

    in my area (DFW- East Texas) RN's have it hands down. I had a technician leave and relocate to Dallas because his wife got an RN job in Dallas. $45 per hour--40hr min--ovt week nights & on weekends...
  14. Love those motor rooms! You know, the ones that...

    Love those motor rooms! You know, the ones that that you walk into and you feel multiple strings of spider web creepishly tickle and drag across you face and hair!!!!!good times!!!
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    Take the terminal cover off and flip it over you...

    Take the terminal cover off and flip it over you can get the compressor family type off the wiring diagram,,,,but the clean and trace method can get you closer.
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    Has this been an issue since the install of the...

    Has this been an issue since the install of the system? Secondly, what is the evaporator arraignment in the walk-in, are the coils mounted all on one side of the freezer, or across from each other?
    ...
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    Saw this with Food Lion in the early 90's. You...

    Saw this with Food Lion in the early 90's. You dont have lubrication issues? Sentronics are rated at 12psi differential. I have found every VFD used in this application, unhooked and bypassed....
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    Just quoted a walk-in install 8x17 for produce,...

    Just quoted a walk-in install 8x17 for produce, and the equipment cost to me was $10000, $16000 cost to the customer. If you can get it for $1800 I think you are coming out ahead no matter the...
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    Pretty sure that case has perforated baffles in...

    Pretty sure that case has perforated baffles in the back wall behind the back panels, and the may be stopped up with dust. The back side of the honey comb may be dirty as well.
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    Haussmann has a training program that is hands...

    Haussmann has a training program that is hands on. I am not sure of the access to this for a contractor though. Outside of that, the best training comes from being an in house tech for a grocery...
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    Craig1

    I am assuming that this case has fans and is off cycle defrost. I am not sure of the particular model of the case that you are dealing with, but if it is as described above and has a 8 to 10 degree...
  22. Thread: rack issues

    by Mkgjr77
    Replies
    45
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    2,093

    Seems to me that I had this happen to me as well....

    Seems to me that I had this happen to me as well. This was probably ten years back or so, I seem to remember having a R-404A rack that is doing what you describe but not generating an alarm, and it...
  23. I worked for a regional grocery store chain (150...

    I worked for a regional grocery store chain (150 stores in four states) and was involved with implementing energy management controls on the refrigeration equipment. The total electrical consumption...
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    T.D

    Hi,

    I thought that I would put my 2-cents in. I have been in the HVAC/refrigeration industry for 16 years (heavy in the refrigeration). For about three years now I have managed the service...
  25. Mixing refrigerants is never a good practice, but...

    Mixing refrigerants is never a good practice, but it some times happens.

    That being said, checking the txv's on evap. coils connected to the rack in question is a way that I have determined the...
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