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Type: Posts; User: mcewans

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  1. Replies
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    You mean its not a "Polar Vortex"? LOL

    You mean its not a "Polar Vortex"? LOL
  2. Replies
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    We have 400hp dc motors that we meg that long,...

    We have 400hp dc motors that we meg that long, but for small compressors (5 tons or less) the reading usually stabilizes within a minute or two.
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    Megger Readings.

    Serviced a Carrier 5-ton RTU (3ph-480V). Found compressor contactor bad and replaced it. Took megger readings before starting up compressor. Read between 115-125 mohm to ground on all three
    legs....
  4. Replies
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    1,872

    Didn't you get the memo from Al Gore? Its "Global...

    Didn't you get the memo from Al Gore? Its "Global Climate Change"
  5. Replies
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    4,899

    This thread reminds me when I first started out...

    This thread reminds me when I first started out when I was doing R12-R134a retrofits on the cars. The instructions said to drain all of the old oil and add the POE oil charge. I just simply added the...
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    I am willing to bet that the reason for the...

    I am willing to bet that the reason for the compressor failure has nothing to do with the retrofit.
  7. Didn't the same thing happen to "Dog the Bounty...

    Didn't the same thing happen to "Dog the Bounty Hunter"? He said some inapproprate remarks about African Americans, and yet his show is still on the air. If they do not bring Phil back, then A&E is a...
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    Did my first R22 to R407C conversion today on an...

    Did my first R22 to R407C conversion today on an electronics cabinet A/C. It seems to be working well. It seem to use less refrigerant than R22, but it is low ambient(68 degrees) inside the plant...
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    Yeah, and I bet that there are no gun crimes...

    Yeah, and I bet that there are no gun crimes committed in NYC. LOL
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    Didn't we go through this before a few years ago...

    Didn't we go through this before a few years ago with OJ? The lord works in mysterious ways!
  11. Replies
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    Has anyone used the Supco 88 with AB oil...

    Has anyone used the Supco 88 with AB oil sucessfully?
  12. Replies
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    4,414

    I guess the point I was making was about "Karma"...

    I guess the point I was making was about "Karma" It always has a way of catching up with you. I think this applies to both OJ and George Zimmerman.
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    Kinda like what happened to OJ.

    Kinda like what happened to OJ.
  14. Replies
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    I am wondering if you can "get away" with not...

    I am wondering if you can "get away" with not changing the mineral oil in the RTU since your pipng in a RTU is alot closer than a split system.
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    It will be intersting to see if how these systems...

    It will be intersting to see if how these systems stand up to the test of time. We have alot of R22 RTUs and I have leaning toward R407c since it has the least amount of capacity lost. I like this...
  16. The car companies are starting to use HC...

    The car companies are starting to use HC refrigerants in the new cars. R134a is being banned in Europe and is being replaced with hfo-1234f. Mercedes is making a big stink about it and GM is starting...
  17. Thread: mo99 problems

    by mcewans
    Replies
    45
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    4,558

    Any residential splits with MO and Supco 88?

    Any residential splits with MO and Supco 88?
  18. Replies
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    Isn't 22 degrees a high for subcooling...

    Isn't 22 degrees a high for subcooling espesically with a 30 degree SH?
  19. Thread: soft solder

    by mcewans
    Replies
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    2,977

    The person who soldered that condenser obviously...

    The person who soldered that condenser obviously didn't prep the lines correctly. Maybe he used the wrong flux and that's why the leaks formed. I have both brazed with 15% rods and used Staybrite 8....
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    Its cheaper from a breakdown point of view that...

    Its cheaper from a breakdown point of view that you are not straining the motor as much by cycling it as oppsoed to running it continiously. Electrical usage will about the same in either case.
  21. Replies
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    I have found the opposite to be true. If you have...

    I have found the opposite to be true. If you have more subcooling, then you have more liquid and therefore fewer bubbles. Think about it, if your subcooling is low, then you won't have enough liquid...
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    This is the reason for the bubbles.

    This is the reason for the bubbles.
  23. Replies
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    I checked, and this works with the FocusPro...

    I checked, and this works with the FocusPro Series. I am not sure about the VisionPro Series.
  24. Replies
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    I think you can solve this problem by hooking up...

    I think you can solve this problem by hooking up the C terminal to the common on the 24V. When power is lost, the compreesor is "locked out" and won't start up until the lockout delay in the...
  25. Replies
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    Every time you open the system, you introduce...

    Every time you open the system, you introduce moisture into the system. Granted if you evacuate below 500 microns, you will get most of the mositure out, but not all of it. That is the purpose of the...
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    Look at it this way, unless you know exactly how...

    Look at it this way, unless you know exactly how the system was installed in terms of evacuation, you should always remove the filter/dryer inside of the system. Unless you measure the pressure drop...
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    Did the compressor part of the capacitor go bad...

    Did the compressor part of the capacitor go bad or the condenser fan motor part? If it is the same part of the capacitor each time it goes bad, then I would look elsewhere for a problem.
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    I learned how to solder first before brazing....

    I learned how to solder first before brazing. Even with brazing, I always cleaned the pipe connections just like with soldering. I always figured you can still get a bad sonnection with dirt or oil...
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    John, Have you ever had any issues with...

    John,

    Have you ever had any issues with inspectors when using Staybrite on installing new systems, since most HVAC manufacturers reccommend brazing the line sets? By the way I am with you with...
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    What is Bridget?

    What is Bridget?
  31. Replies
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    Air flow may be a bit on the high side. SH is low...

    Air flow may be a bit on the high side. SH is low and SC is too high.
    Is this a matched system?
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    Check internal wiring of compressor.(Voltage...

    Check internal wiring of compressor.(Voltage selection)
  33. Replies
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    What is the difference between city water and...

    What is the difference between city water and rain water?
  34. Its "B-Phase" grounded." Really!:grin2:

    Its "B-Phase" grounded." Really!:grin2:
  35. Thread: Support for

    by mcewans
    Replies
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    879

    How would it be better? The whole point of...

    How would it be better? The whole point of purging with nitrogen is to displace oxygen. I would think that any gas could be used in theory provided it is pure, does not react with oxygen and is free...
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    That is strange, because in low temperature...

    That is strange, because in low temperature refrigeration, you pump down the system at the end of each run cycle. Maybe its different for A/C compressors.
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    I have to disagree with the above statement. If I...

    I have to disagree with the above statement. If I bring my car to a repair shop and pay to diagnose the problem, then I would expect them to tell exactly what parts are needed for repair. I am paying...
  38. Replies
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    What do you mean, I saw an electrical panel like...

    What do you mean, I saw an electrical panel like that in Waukeagn, IL!
  39. Replies
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    I was reading 480V phase to phase. I threw in...

    I was reading 480V phase to phase. I threw in that 277 reading to let you know I had good power on all three legs. Anyway I tried it again this morning after leaving the unit locked out overnight....
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    Each leg is 277 volts. I will let it set...

    Each leg is 277 volts. I will let it set overnight and check tommorow.
  41. Replies
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    2,107

    2-3ohms.

    2-3ohms.
  42. Replies
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    2,107

    Bad Compressor?

    Carrier Weathermaker
    Model #48DJE06620
    S/N 1590648269.
    Found unit not working on CLO. Turns on for one second and shuts down immediately. Checked HPS,LPS and temperaure switch on evaporator all...
  43. Replies
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    6,956

    Since your Mom has one, that would be a good...

    Since your Mom has one, that would be a good training exercise for you to see if you can get that old one to work. Based on your posts, it sounds like you want to "dive" into this because curiousity...
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    Then apply for Pro status and you will have a...

    Then apply for Pro status and you will have a wealth of information at your fingertips.:yes:
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    There are alot of factors in considering repair...

    There are alot of factors in considering repair vs. replacement. First and most important is the condition of your current furance. Has the furnace been giving you problems or if this the first time...
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    This should not be an issue as long as you have...

    This should not be an issue as long as you have the proper sized circuit breaker/fuse installed upstream of the contactor.
  47. Thread: TXV hot swap

    by mcewans
    Replies
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    5,694

    Do you mean mean not?

    Do you mean mean not?
  48. Thread: Wire size

    by mcewans
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    2,993

    I know this is residential, but is this single...

    I know this is residential, but is this single phase or 3-phase?
  49. That looks like an Armstrong Magic-Pak. I called...

    That looks like an Armstrong Magic-Pak. I called my distributor the other day and they are still selling complete cooling chasis units for these package units. You can still get compressors for this...
  50. The short answer is yes. It is possible to...

    The short answer is yes. It is possible to connect that condensing unit to your evaporator coil. Assuming the contractor you use connects everything properly electrically and mechanically, evacuate...
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