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Type: Posts; User: jayguy

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  1. Replies
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    Uh...the above comments AREN't in writing?

    Uh...the above comments AREN't in writing?
  2. Replies
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    I wouldn't...unless you want to sell more belts.

    I wouldn't...unless you want to sell more belts.
  3. Thread: Different RPM?

    by jayguy
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    394

    a 'correctly labeled capacitor' does not mean a...

    a 'correctly labeled capacitor' does not mean a 'good capacitor'. check the old motor out properly. sometimes, old motors just get weak too.
  4. 735 VAC even on a regular meter is still waaay...

    735 VAC even on a regular meter is still waaay high. i use my True RMS meters on drives quite often, while they are not perfect, they still get fairly close.

    to truly see what is going on, you...
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    411

    If you can reuse the old locknut with the...

    If you can reuse the old locknut with the balancing weights on it and you DON'T have high vibration, then you are very lucky. All of the rotating components are balanced at the factory, however,...
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    411

    It's a possibility. I have only run my...

    It's a possibility. I have only run my compressors the proper direction so I don't know what a backwards centrifugal will do. I also have always air run the compressors will the elbow off after the...
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    Get a vibration analysis performed...by the local...

    Get a vibration analysis performed...by the local Trane office would generally be best since they will have to warranty it if it is their fault.
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    I am sure that roofers warranties are "CYA". YOU...

    I am sure that roofers warranties are "CYA". YOU know that the condensate won't hurt the roof. And I know that too, but roofers don't because they heard about "this one time" where condensate ruined...
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    Blocking off some of the combustion air blower...

    Blocking off some of the combustion air blower holes with electrical tape is also a way to get the manifold pressure up. It's also wrong but a sure fire way to know that someone didn't know what they...
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    the "negative pressure" gas valve system will not...

    the "negative pressure" gas valve system will not let gas through IF the system is set up properly, however, these gas valves are commonly misunderstood and you can get about 1.0-1.5" of positive gas...
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    Water and Patience.

    Water and Patience.
  12. Replies
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    761

    I meg everything pretty much. If the customer...

    I meg everything pretty much. If the customer paid me to maintain their equipment, then I am going to use every tool at my disposal. I meg 115 VAC motors quite often.
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    Kinda like high school, eh?

    Kinda like high school, eh?
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    761

    I doubt that you will find one worth anything at...

    I doubt that you will find one worth anything at that price range unless it's used or on eBay. I view a Megger the same as a recovery machine. It's an expensive piece of equipment that is almost...
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    761

    This is up for debate. I meg everything at...

    This is up for debate. I meg everything at 1000VDC...even 115 VAC systems. Make sure that you have disconnected any electronics before you get started.
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    761

    I meg each electrically isolated winding. In a...

    I meg each electrically isolated winding. In a simple 1 or 3 phase starter system, all 3 windings are tied together so if you meg 1 leg you will have Megged them all (assuming that there isn't an...
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    761

    I prefer to meg for 10 minutes. I record the...

    I prefer to meg for 10 minutes. I record the value at 1 minute and 10 minutes and then divide the 10 minute value by the 1 minute value. The higher the value, the better the overall meg reading. My...
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    This is a waste of time since all legs...

    This is a waste of time since all legs (presumably) are tied together and has low ohms (relative to the Megger reading).
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    Almost every chiller I have used them. 99% of the...

    Almost every chiller I have used them. 99% of the time, they work way better than any TXV. Troubleshooting does take a little while longer but you kind of already have an idea of what's wrong and how...
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    Both values (separately) are valuable. You can...

    Both values (separately) are valuable. You can see why both values together have even more value. I usually take my readings "cold" as this is typically the worst case scenario and gives me more...
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    That is incorrect. The purpose of the adjustable...

    That is incorrect. The purpose of the adjustable sheave is to dial in the airflow to the designers specifications. It is true that you do not want to over amp the motor, however, that is a side...
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    I understand the pricing concern. And maybe in...

    I understand the pricing concern. And maybe in some areas of this rock it really is overly expensive and so retrofitting is a reasonable choice.

    However, in the US and many other parts of this...
  23. As an industry, we asked for cheaper. We got what...

    As an industry, we asked for cheaper. We got what we asked for.
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    there are several assumptions being made here and...

    there are several assumptions being made here and they are wrong. Stop doing it this way. Use the pressure/temperature method and be accurate and done with it. The temperature/temperature method has...
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    when going to a fixed pitch sheave, you only get...

    when going to a fixed pitch sheave, you only get a few choices per inch of diameter (and sometimes less than that when you get into the bigger diameters). if the situation is critical, then you will...
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