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  1. Replies
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    Safety is paramount, and it is your...

    Safety is paramount, and it is your responsibility as the contractor to keep them safe. We shut down the unit turn off the gas and have the customer sign that they understand what's going on. If it...
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    Have you tried a generic rod? I've done that in a...

    Have you tried a generic rod? I've done that in a pinch.

    Sent from my Nexus 7 using Tapatalk
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    Anytime the piping or condenser go below the...

    Anytime the piping or condenser go below the ambient's dewpoint it will sweat. Might want to insulate as insurance.


    Sent from my Nexus 7 using Tapatalk
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    Don't forget duct butter. I walk by that stuff at...

    Don't forget duct butter. I walk by that stuff at United and I've got it on me.
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    I always recover and weigh in by nameplate if...

    I always recover and weigh in by nameplate if there is a concern. Make sure your water loop is within the limits of the heat pump. Superheat in that small of a unit can be checked anywhere on the...
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    One of the main purposes of the heater is to warm...

    One of the main purposes of the heater is to warm the oil and drive reefer out of it, so to me the heater should be as close to the bottom of the sump as possible.
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    Most of the large AHU's i work with have a...

    Most of the large AHU's i work with have a magnehelic gauge across the filter bank. We mark the pressure difference on the new filters and replace them when they have increased about 40 percent. They...
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    Considering what I've learned from you. I'm still...

    Considering what I've learned from you. I'm still in your debt.
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    What is your GPM and how are you testing this?...

    What is your GPM and how are you testing this? What are you pressures and temps?
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    both cycle times are correct. Liebert uses a 15...

    both cycle times are correct. Liebert uses a 15 second interval.
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    You've probably already checked this but is your...

    You've probably already checked this but is your condensate line trapped? You might be pulling the condensate back into the pan due to vacumn.
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    I'm just replying so I will be subscribed to this...

    I'm just replying so I will be subscribed to this thread. Thanks for the updates.
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    That's awesome. But still makes me wonder if the...

    That's awesome. But still makes me wonder if the local crackheads weren't messing around. I just don't know how it would fly like that.
  14. I don't know where you are located, but you might...

    I don't know where you are located, but you might want to look into whether your condensers have all the low ambient controls needed. The piping will depend on the location of the condensers in...
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    Sorry, I should have been more thorough reading...

    Sorry, I should have been more thorough reading this post. Since I'm in cooling season I have tunnel vision. As already posted georgehvac has the right calculation.
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    Get the wb temps before and after the coil and...

    Get the wb temps before and after the coil and convert to enthalpy difference, multiply by CFM then by 4.5.
  17. You could make a larger one with a five gallon...

    You could make a larger one with a five gallon bucket i guess.
  18. There are commercial ones available, i think...

    There are commercial ones available, i think Appion makes one. An old Navy boiler operator I know made his in school. It was basically 1/2 inch copper in a tight coil inside a coffee can. Each stub...
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    I have the corded model. I here that the battery...

    I have the corded model. I here that the battery operated ones work well too, however; I have never used one.
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    It seems like i have used or purchased every leak...

    It seems like i have used or purchased every leak detector there is at one time or another. The H-10 is simply superior to them all. IMHO. I purchased mine slightly used on Ebay for about what your...
  21. Employing rules of thumb can get you in serious...

    Employing rules of thumb can get you in serious trouble. Engineers have full time jobs calculating commercial loads in buildings. There are just too many variabes. Chemical treatment should also be...
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    I would also try to figure out what killed it the...

    I would also try to figure out what killed it the first time. Low superheat, washout, air flow issues, bad oil return.
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    Was it floodback that killed the old compressor?...

    Was it floodback that killed the old compressor? I'm assuming it was, however if it was not mechanical then you'll want to test for acid. I would flush the system with rx-11 then purge with nitro and...
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    Wow, a shady looking guy with a battery operated...

    Wow, a shady looking guy with a battery operated saw. I think everyone on this site would get arrested! Probably get some warrents off the books too.:-)
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    Sporlan's website is a wealth of info. I would...

    Sporlan's website is a wealth of info. I would also suggest using the search option on this site for accessing some of the archives on this subject, there are some great ones.
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