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  1. Replies
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    Google "california labor laws overtime hours"

    Google "california labor laws overtime hours"

    Keep records of your hours and dates.

    You can hire an attorney and get some backpay.

    Call the State Labor Board first if you want.

    There are...
  2. Thread: carrier clo

    by uhPrintUs
    Replies
    16
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    1,871

    Cond Fan Motor

    I'd recommend checking for condenser fan motor bearing play. If the shaft moves side to side even a tiny amount, it will overheat and shut off after running a few hours on a hot day.

    Regarding...
  3. Thread: SMAN 3

    by uhPrintUs
    Replies
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    5,310

    SMAN 4

    http://www.trutechtools.com/SMAN4
  4. Replies
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    5,956

    We cannot be TOO careful!

    I have a friend, who fortunately escaped injury, who was doing pre-start-up checks inside a larger air handler. He had verified with his meter the power was off. He had just finished working at the...
  5. Gas Ballast

    http://www.yellowjacket.com/sites/default/files/product_manuals/142993_D%20English.pdf

    Per the info at Ritchie Engineering website in link above, the gas ballast should remain open until 1,000 -...
  6. Replies
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    Portable Sunshine

    http://streamlight.com/education/guide.aspx

    Everyone has their own likes & dislikes when it comes to flashlights. An air balancer friend of mine had a Streamlight flashlight that impressed me so I...
  7. Replies
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    Regarding inverted traps---

    Just remember that the purpose of an inverted trap is to prevent the liquid refrigerant from draining by gravity from the coil into the compressor during the off cycle.

    So, if the air handler is...
  8. Hmmmm

    So, the seasoned tech blames the problem on you for not checking the compressor terminals, but he didn't check the terminals either until after he was ready to button things up and walk away!

    And...
  9. Questions about Fieldpiece SMAN3 digital manifold

    I've never used Fieldpiece instruments.

    1. With the SMAN3, if a person wanted to measure temperature on a pipe larger than the pipe clamp is suitable for, is it possible to plug a Fluke temp...
  10. Replies
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    How much is "a little bit"?

    If the kink causes "a little bit" of pressure drop, it MIGHT cause trouble on the hottest days.

    Pressure drop in the liquid line reduces subcooling, sometimes to the point of flashing liquid into...
  11. Replies
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    2,435

    So you have 47 degrees of superheat at the...

    So you have 47 degrees of superheat at the compressor. That seems pretty high. I'd open the TXV to bring the SH down, which will also increase the suction pressure and provide more capacity out of...
  12. If he had done the job correctly the first time,...

    If he had done the job correctly the first time, replacing the refrigerant would be unnecessary. I agree with all of the above. Now the entire system needs to be evacuated, not simply the line set...
  13. Replies
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    Time for a second opinion

    A. A leak can lead to a compressor "failure", but if your compressor worked long enough to produce a cool suction line as you described, my "guess" is that the compressor is ok. Compressor...
  14. Replies
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    2,770

    Refrigerant line whistling may also be caused by...

    Refrigerant line whistling may also be caused by excessive velocity, which is caused by undersized lines.

    If the line is kinked, such as at the bend where the line enters or leaves the wall, this...
  15. Osmotic pressure difference causes the problem

    Google "Examples of osmosis".

    When you read a definition of osmosis, don't stop reading after the first couple of sentences. Keep reading to understand what it means.

    The semi-permeable...
  16. Replies
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    ???

    I'm not sure what you mean by the phrase "Head pressure: 118F 83 + 35 = 118F"

    Head pressure and High Side Pressure are the same, and pressure is in psig, not degrees F.

    You indicate the...
  17. Replies
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    1,715

    Yellow Jacket Flexible Steel Hoses!

    Yellow Jacket Flexible Steel Hoses!

    Order the length and diameter you want, then treat them with care and don't loan them out. Most of the times I've loaned mine, even to those I thought would...
  18. Replies
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    What's the source of that information?

    I may agree with the point you're trying to make, but I like to be careful before spreading false information, so I did some searching and I cannot find an organization called "United Nations...
  19. Liebert XDC Chiller Pump "Loss of Flow" Issues

    How many people are having flow loss issues with the Liebert XDC Chillers that use R-407C to cool the pumped R-134a? Also, is there anyone who has NEVER had this occur?

    We've determined multiple...
  20. Replies
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    I see you posted your question almost two months...

    I see you posted your question almost two months ago but received no responses. Have you solved the problem yet?

    What model is the equipment?

    Does the controller allow you to set the humidity...
  21. Thread: micron gauge

    by uhPrintUs
    Replies
    68
    Views
    9,386

    I agree regarding the Thermal and cold weather....

    I agree regarding the Thermal and cold weather. It took me awhile to figure out the problem and it was quite frustrating to arrive at the job site on mornings when the temp was around 40 degrees F...
  22. Replies
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    1,858

    I was told the fittings are solderless and are...

    I was told the fittings are solderless and are not shark-bites
  23. Replies
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    1,858

    What kind of fitting is this?

    223472
    These fittings were seen on R-410A discharge & liquid lines to join soft tubing for a Liebert rooftop condenser. The system has been operating for a few months, including during some 100+...
  24. Replies
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    714

    What kind of fitting is this?

    These fittings were seen on R-410A discharge & liquid lines to join soft tubing to a rooftop Liebert condenser that has been in operation a few months, including some 100+ degree weather.

    What...
  25. r22eric, Since this is your first post, I...

    r22eric,

    Since this is your first post, I suppose you don't understand how the forums work, because you should start a new thread instead of beginning a new topic in the middle of another thread....
  26. Replies
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    1,432

    Keep in mind, the correct way to check net oil...

    Keep in mind, the correct way to check net oil pressure is by checking oil pump discharge pressure and "Crankcase" pressure, which may be higher than "Suction" pressure if your compressor has...
  27. Replies
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    2,715

    Our installation...

    Our water cooled condensing units are connected to a closed loop cooling tower. All of the condensers are at a level lower than both the return and supply mains, so the condensers remain full of...
  28. Question

    I HAVE to ask this! Did you obtain subcooling by comparing saturation temp to the discharge pressure? I assume you did since you didn't include a "Liquid Line" pressure. Most condensers have enough...
  29. Replies
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    2,715

    Thanks

    Thank you.

    Your responses have given me some ideas as to reasons for piping one way or the other. I've seen it done both ways, and was curious why some instructions state to install on the inlet...
  30. Replies
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    2,715

    Water Regulating Valve

    Water-regulating valves controlled by refrigerant head pressure are recommended to be installed in the supply water line to a condenser. I've seen several installed many years ago that are in the...
  31. 24 degree delta T across condenser

    If there is a 24 degree rise in the glycol/water temp through the condenser with 20 tons of cooling, you're not getting much more than 1 gpm per ton (about 22 gpm total). According to the Liebert DS...
  32. Flow measurements

    You'll need to determine the glycol flow through the condenser. Also, the specific gravity & specific heat of the glycol/water mixture is needed.

    Water flow is typically designed at 3 gpm per ton,...
  33. Replies
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    If you're a STAR you'll probably pass the STAR exam without studying

    I know a 3rd year apprentice who took the HVAC Mastery exam and passed with no preparation at all. He didn't know it was the UA STAR exam because it was given to help determine who would be allowed...
  34. Replies
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    From what I've heard others say, the Nu-Calgon...

    From what I've heard others say, the Nu-Calgon Nu-Seal product is a permanent sealant when used per instructions. It was used 10 years on nuclear submarines, and underwent extensive testing prior to...
  35. The issue with the 06D compressors in these Lieberts:

    The issues are with Liebert Deluxe & also DS 30 ton 4 step units containing Carlyle 06DF537 compressors with unloading that were shipped from March 1, 2007 - Oct 19, 2008.

    Any compressor with a...
  36. Replies
    7
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    986

    RA Temp

    Even though the condenser water supply is colder than recommended, since you have the head pressure controlled with the water regulating valve, is the water temperature the real issue?

    It seems to...
  37. Method I'm using to remove compressors:

    Domcort,

    These units are not sitting on a data room floor like we typically find, but instead are in small rooms just outside the actual data room, sitting on the typical Liebert stands, so the...
  38. Liebert Deluxe System 3 Compressor Changeouts

    Has anybody come up with a method to more easily replace the Carlyle 06D compressors in the Liebert Deluxe System 3 units, such as the model DH380A?

    Thanks!
  39. Replies
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    6,382

    Re: Micron Guages

    I don't have much experience, but my co-workers have taught me enough and shown me enough to know the importance of using a micron gauge.

    This is one experience I personally saw that may help you...
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