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  1. Replies
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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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    you also have to multiply this value by the power...

    you also have to multiply this value by the power factor of the motor "at load" not by the nameplate power factor unless you are at nameplate conditions.

    i wouldn't worry too much about the motor...
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    a high pressure drop in the return might warrant...

    a high pressure drop in the return might warrant a powered return fan. i have seen many ducted returns that have much more pressure drop than the prints say they do. it causes quite a problem...
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    a few things to keep in mind when using this...

    a few things to keep in mind when using this chart...

    1. many smaller units assume a certain filter is installed and that it is a clean filter
    2. many smaller units assume that the cooling coil...
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    perhaps the 1st steam coil failed (holes,...

    perhaps the 1st steam coil failed (holes, deteriorated) and so they just added the others? the first coil could have been a tempering coil (bring the air up to 55F or so) and the 2nd coils brought...
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    I am pretty sure "ESP" is everything EXCEPT what...

    I am pretty sure "ESP" is everything EXCEPT what shipped with the unit (ducts, dampers, connectors, terminals, vav's, etc).

    TESP is EVERYTHING that the fan sees including the ESP and the coils,...
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    it could be the belt. it could be the sheave. it...

    it could be the belt. it could be the sheave. it could be both. slippage is slippage. if the belt is slipping, then something isn't right and everything will wear faster.
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    Yup. I also add reduced vibration to the sales...

    Yup. I also add reduced vibration to the sales pitch. It is difficult to get anyone to replace them out-right even in a large commercial/industrial setting.
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    As close to the metering device is the standard...

    As close to the metering device is the standard response, but I question it.

    If the filter is installed at the outlet if the condenser, what is between the filter and the metering device that...
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    that's the problem with dry bulb decisions...they...

    that's the problem with dry bulb decisions...they do not always work. you seem to be correct in your thinking, but what else are you going to do?
  12. sizing a condenser isn't very difficult, however,...

    sizing a condenser isn't very difficult, however, if someone forgot about the heat of compression, then it will be undersized...20 ton condenser is not used on a 20 ton evaporator.

    from what...
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    Got a log sheet? Are the sensors accurate? Is it...

    Got a log sheet? Are the sensors accurate? Is it running in Economizer mode or not? If not, what is the Economizer temp right before the solenoid valve (flash tank side)?
  14. Here's the deal. When you go to the doctor, he...

    Here's the deal. When you go to the doctor, he wants to know what you ate, what color your crap was, how your Grandpa died, etc. You don't question why they want it, you just give it to them and let...
  15. You are going to need to gather more info than...

    You are going to need to gather more info than that and post it because you are about to find out the TXV is not the problem.
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    I pulled my 2 ton home AC down to 35 microns and...

    I pulled my 2 ton home AC down to 35 microns and let it set there on the pump for a few days. No problems. No particular reason either. I have pulled machines down to well below 200 microns without...
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    the difference in my chiller and yours is that my...

    the difference in my chiller and yours is that my chiller was over 30 years old and probably had thicker walled tubing....so the greatest erosion occurred at the return head point. i will bet that...
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    We had a Trane chiller that had a severe erosion...

    We had a Trane chiller that had a severe erosion issue and it ate the oring wall away until it couldn't hold the oring in any more. We had a company company come in and apply Belzona. They were able...
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    that is the part number that i installed last...

    that is the part number that i installed last year. when the liquid level is in the sight glass, press the button. the level is now set. when i set it, i manually messed with the system a lot until i...
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    Got a picture or part number for the sensor? The...

    Got a picture or part number for the sensor? The last one I installed (late last year) had the 4 buttons but 3 were covered up by a plate because you only needed the 1 button to calibrate it. It...
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    Let's say that you are moving 5 CFM of...

    Let's say that you are moving 5 CFM of refrigerant...then you unload to 3 CFM of refrigerant...but the Suction Line size stays the same. The TXV is still feeding 5 CFM of refrigerant at the moment of...
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    It might go sideways! Suction will go up...

    It might go sideways!



    Suction will go up and discharge will go down until the fan cycle/controller catches up (if there is one)...then the discharge might go back up.
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    If there aren't any buttons on the liquid level...

    If there aren't any buttons on the liquid level sensor or if it is original, then you can not calibrate it. The new ones are easy to calibrate. You might be better off posting in the "chillers"...
  24. Sometimes the contracts are bid to be losers so...

    Sometimes the contracts are bid to be losers so that the real money comes in with pull-through work.
  25. That is not preventative maintenance...but it...

    That is not preventative maintenance...but it does seem like a waste of money.
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