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  1. #118
    Join Date
    Jul 2018
    Location
    North Texas
    Posts
    19
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    No worries, glad I could help. The programmed blower delays are off delays (after cooling call ends), not on delays (at start of cooling call), so the presence or absence of the delay shouldn't affect the coil freezing/frosting. But the lower airflow on tap 3 vs. tap 5 might be enough to cause it. I'm not completely certain, I'm still fairly green, hopefully one of the really knowledgeable and experienced guys participating in this thread can tell us if 81 less CFM would be enough to cause your frozen evap.

  2. #119
    Join Date
    Feb 2016
    Location
    Cherryville, NC
    Posts
    106
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    Thread Starter
    Ahh, I misunderstood. It was said earlier with .6 static I’m slightly below design minimum airflow ( don’t recall actual number) so 81 more cfm may just be enough to make the difference. Like you said maybe one of the more experienced will confirm this for us.

  3. #120
    Join Date
    Nov 2011
    Location
    USA
    Posts
    1,917
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    ..been two weeks since your original post. Is it still frosting up? Every day or just sometimes?

  4. #121
    Join Date
    Feb 2016
    Location
    Cherryville, NC
    Posts
    106
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    Thread Starter
    I put the freeze stat on and haven’t been back. They got tired of me being there so I figured I’d give them a break as long as their house was keeping temp and he said it is. But in my mind I know it’s not right.

  5. #122
    Join Date
    Nov 2011
    Location
    USA
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    Quote Originally Posted by Prowelder View Post
    I put the freeze stat on and haven’t been back. They got tired of me being there so I figured I’d give them a break as long as their house was keeping temp and he said it is. But in my mind I know it’s not right.
    There are varying degrees of "right." Not as much variation if you're a perfectionist...

    All the numbers you have posted don't indicate a "chronic" airflow issue...if the best you could have gotten was a 33-34˚ coil then extreme low load indoor conditions could have led to frosting.

    Something was going on for sure...but if the freeze stat fixed it and HO is happy, the degree of "right" is close enough IMO. I walk away from stuff every day that isn't "optimum" and would kinda' like to mess with it a while to see what's going on. But if you fix an electrical issue, then find a 35˚ coil, you can bet the 35˚ coil has been going on long term. And for me, it's a can of worms best left unopened...

  6. #123
    Join Date
    Feb 2016
    Location
    Cherryville, NC
    Posts
    106
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    Thread Starter
    You are exactly right on all points there. I am sort of a perfectionist but more so just want to make sure no one can come behind me and point the finger at me for something.

    From reading on this site I get the impression that there is a “right” and “wrong” way of doing things and if it ain’t exactly “right” then it is wrong and a hack job and I don’t want that kind of label from anyone anywhere...internet included.

  7. #124
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    22,152
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    Sometimes you have to fake it until you make it.

    When I first got into the trade, I was getting so much information that just wasn't right. No Internet back then. Then when the Internet did come along, it was NOTHING like it is today!

    You do the best you can, with the best information you can get your hands on, and at each step, that learning curve tends to cease it's steep rise. You just don't want that learning curve to go completely flat, or begin to curve down.


    Quote Originally Posted by Prowelder View Post
    You are exactly right on all points there. I am sort of a perfectionist but more so just want to make sure no one can come behind me and point the finger at me for something.

    From reading on this site I get the impression that there is a “right” and “wrong” way of doing things and if it ain’t exactly “right” then it is wrong and a hack job and I don’t want that kind of label from anyone anywhere...internet included.
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

  8. #125
    Join Date
    Feb 2016
    Location
    Cherryville, NC
    Posts
    106
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    Thread Starter
    Thanks for all your help guys, I live by my own motto that if I’m not learning something everyday I’ve wasted the day. I strive for knowledge everyday and generally live up to that everyday. Keeps life interesting!

  9. #126
    Join Date
    May 2014
    Location
    Bay Area California
    Posts
    22,152
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    Sometimes it is multiple issues all coming together in a perfect storm. For example, if doing a PM and I run across an RTU (commercial) with only a 12 or 14*F temp split, I hardly give it a second thought any more. When the customer complains, then I'll dive into it and tell them what is going on.

    Why don't I care any more?

    Actually, I do. I just don't care to waste unbillable man hours during a quoted PM, or to waste the customer's money when they have no complaints. One exception might be something like a server room, then I'll bring discrepancies to everyone's attention. If for no other reason to cover my butt.

    Think about it, to see a unit with a low split could be a combination of too much airflow, possible broken ducting, slightly restricted orifices in the evap header, dirty condenser, weak compressor, and who knows what else. You can't just fix one thing and expect the unit to perform up to spec.

    When the customer does complain, then I'm your man. I'll go in and give a report that will detail any and all discrepancies that can possibly be known without doing other recommended repairs. And I can usually spell it out in such a manner that the customer, my employer, and co-workers can all understand. Takes a bit of experience to get to that point.

    Or at least to spell out a game plan that is the most prudent and cost effective.

    Can never explain some things to the bean counters, no matter who those bean counters work for. They live binary world. Yes/no, black/white, broken/not broken, etc.


    Quote Originally Posted by Prowelder View Post
    Thanks for all your help guys, I live by my own motto that if I’m not learning something everyday I’ve wasted the day. I strive for knowledge everyday and generally live up to that everyday. Keeps life interesting!
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

  10. #127
    Join Date
    Feb 2016
    Location
    Cherryville, NC
    Posts
    106
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    Thread Starter
    I spend most of my time on commercial roofs as well and while doing pm’s most discrepancies get noted and I move on. But this was at a local baseball coach’s home and don’t want any reason for someone to say anything negative about the job I did. I was just trying to help him out.

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