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  1. #14
    Join Date
    Feb 2006
    Location
    USA
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    4,365
    Quote Originally Posted by crstephens83 View Post
    why do you say that it is flooding to the compressor? Because the manitowoc compressors on the qy machines always have frost through the freeze cycle going to the compressor especial toward the end of the freeze. The key to the refrigerant pressures on the Qy machines is at the very end of the harvest cycle if it ever so slightly different from the book there is a problem. From your info about the sheets not falling off as long as the nickel is still on the evaps I would look into the cool vapor solenoid valves not opening all the way.
    his harvest pressures were on point ... it does seem like a release issue though.



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  2. #15
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    569
    1. If the only problem was harvest valves, you would still have normal discharge line temps. The problem is happening during freeze.

    2. He said whole top of compressor is frosted during freeze. I've never seen that on a normally functioning Manitowoc before.

    Besides my point was not to give the customer a diagnosis, it was to explain to the customer that something EXPENSIVE is broken on his ice machine!

  3. #16
    Join Date
    Feb 2006
    Location
    USA
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    4,365
    if your not equal to or above 150° DLT at the end of freeze cycle your low on charge. . add that to the bad evap you will have release issues due to the obvious. evap at least free of mineral build up? ... id say download the analysis chart but with that evap is it even a legit procedure?

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  4. #17
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    569
    Lol thats funny "is it even legit?" I agree, its probably not!

    Personally, I think about it like this: low discharge line temp on this type of ice machine is probably one of three things, 1 - low on charge, 2 - compressor issue, or 3. overfeeding txv. Of those 3 choices, which one causes the top of the compressor to freeze up!!!???!!! Heck it might be an overcharge. That's why its a good idea to weigh in the charge first.

  5. #18
    Join Date
    Apr 2007
    Location
    Scottsdale,AZ
    Posts
    78
    Evaporator may be very dirty causing floodback and keeping dlt down. But with evaporate on conditon it is no repair will ever make that machine right.

  6. #19
    Join Date
    Jan 2005
    Location
    where it's nice and warm
    Posts
    236
    QY model comes in both quiet cube and regular machines and harvest related problems are diagnosed differently.What type of machine are you working on.

  7. #20
    Join Date
    Dec 2011
    Location
    Michigan
    Posts
    119
    Quote Originally Posted by trippintl0 View Post
    That's why its a good idea to weigh in the charge first.
    Agreed


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  8. #21
    Join Date
    Feb 2006
    Location
    USA
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    4,365
    Quote Originally Posted by ararams View Post
    QY model comes in both quiet cube and regular machines and harvest related problems are diagnosed differently.What type of machine are you working on.
    his m# would end in C if I'm not mistaken if its a quiet cube . . using a CVD condensing unit .. the N is traditional remote .... i think lol, its early yet ..

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  9. #22
    Join Date
    Feb 2012
    Posts
    7
    Could the superheat need to be adjusted? If work was done on the machine in the past, I wouldn't take anything for granted as far as charge, valve settings, superheat, etc. I see a lot of "weigh in the charge" comments, and while that is always the correct thing to do, that doesn't alleviate the need to check other factors.

  10. #23
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,365
    yanno ... i think myself & OP are wrong on the DLT @ EOF needing to be 150° or greater.. isn't it 160 on Q models? ... for some reason this just popped in my head but i haven't worked on a traditional Q remote in a while ..... so the 143° he's having would be something to check. .... if its constant 143° @ EOF each time you need to get the charge right. if not lean towards expansion valves checkout including checking bulb mount, insulation blah blah .... or junk that p.o.s. machine lol

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  11. #24
    Join Date
    Sep 2011
    Location
    Fayetteville, NC
    Posts
    130
    Thanks everyone. Went back this morning and pulled the charge. System calls for 15 lbs. Hit 15 and kept going and going. System was over charged by 6 lbs. Weighed it back in and restarted unit. This time floodback not as bad but compressor still getting liquid back. Told the customer that the txv would need to be replaced and and the evap. He took it quite well and askded for a quote for repair and a quote for new. I hope he makes the right choice.

    Just wanted to thank everyone. And I did check delta t across the evap.

  12. #25
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,365
    good to hear. hope the customer has the means to make the wise choice & go new

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  13. #26
    Join Date
    Apr 2007
    Location
    Scottsdale,AZ
    Posts
    78
    You really should try to replace it. I do not believe replacing the valve will solve the flooding. The main problem is that Evaporator. Replacing one part when another is obviously bad is a bad use of customer money. You need to be honest with the customer that spending any money on that machine is the wrong decision. I would not even provide a quote for repair. Hopefully you have a good professional relationship and he will respect your input.

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