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Thread: manitowac chaos

  1. #1
    Join Date
    Mar 2008
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    wi
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    282

    manitowac chaos

    Had an mod QY1474 remote givin me the shaft. Previous tech had left the unit off because he didn't have time to deal with it. I get sent out there and turn the sucker on and it ran fine in freeze and harvest mode. cycled it again and the next two batches only the left side would harvest. The right side wouldn't. Even though the solenoid was energized and I could see the that the tubes on the evap (frost was melting but ice wasn't droping) Went to the roof and the line leaving h/master going to the reciever was warm as the discharge line in harvest. Then I melted the ice off the right evap and re-cycled the darn thing it did the same thing. So I called mani and they said that its probably my solenoid. I went and got valves for both sides and reurned only to find the darn thing running 100% fine. I replaced the valves and cycled it about 12 times it ran fine. I'm wondering If any of you guys had this happen. Also this was doing the same thing to the last tech right side wasn/t harvesting. My head press was good it was around 260# for 404. During freeze mode my liquid line was warm also when I recovered the chare it was dead on to mani specs 12.5 #. If anything two guesses would be harves solenoids acting goofy, oor head master "but come to think of it if my head master was shot why would only right side not harvest" It couldn;t be the board because both valves are wired in parelell and coil had magnetic pull. Evap coil ws forming ice nicely

  2. #2
    Join Date
    Oct 2001
    Location
    Comstock Park Michigan
    Posts
    100
    Mani's have very strange issues like that all the time. Probably valve not opening all the way and not getting enough gas to harvest both evaps. Or right evap is dirty and sheet is sticking, or right sheet is freezing too thick and sticking to plastic frame around evap, or headmaster is not fully bypassing in harvest and not getting full volume of cool vapor to harvest solenoid. So many possibilities its not even funny. Have had major problems very similar to this one. Most have been solved with a combo of new harvest solenoid and new headmaster and weigh in charge. Good luck.
    We do it nice cause we do it twice!

  3. #3
    Join Date
    Aug 2007
    Posts
    243
    Quote Originally Posted by wildtech View Post
    Had an mod QY1474 remote givin me the shaft. Previous tech had left the unit off because he didn't have time to deal with it. I get sent out there and turn the sucker on and it ran fine in freeze and harvest mode. cycled it again and the next two batches only the left side would harvest. The right side wouldn't. Even though the solenoid was energized and I could see the that the tubes on the evap (frost was melting but ice wasn't droping) Went to the roof and the line leaving h/master going to the reciever was warm as the discharge line in harvest. Then I melted the ice off the right evap and re-cycled the darn thing it did the same thing. So I called mani and they said that its probably my solenoid. I went and got valves for both sides and reurned only to find the darn thing running 100% fine. I replaced the valves and cycled it about 12 times it ran fine. I'm wondering If any of you guys had this happen. Also this was doing the same thing to the last tech right side wasn/t harvesting. My head press was good it was around 260# for 404. During freeze mode my liquid line was warm also when I recovered the chare it was dead on to mani specs 12.5 #. If anything two guesses would be harves solenoids acting goofy, oor head master "but come to think of it if my head master was shot why would only right side not harvest" It couldn;t be the board because both valves are wired in parelell and coil had magnetic pull. Evap coil ws forming ice nicely
    Cool vapor valves that hang up from time to time are a problem with ice machines. I have seen them and they may act up one moment and be fine the next.....

    Changing them both is a good way of just getting it done and over with.

    As long as the evaporator plate is not causing the ice to hang up then you are okay....
    "It's not that I'm so smart, I just spend more time with problems." Albert Einstein

  4. #4
    Join Date
    Aug 2007
    Location
    Southern,Ca
    Posts
    544
    ok so i am pretty sure that the cool vapor valves are not wired in parallel, they each come off of a different terminal on the circuit board on that machine, review the schematic. second these machines have been known to act strange on startup after a safety limit shutoff,for the first two cycles or so, and than run properly . Now were your machines off on a safety?

  5. #5
    Join Date
    Jun 2006
    Location
    Texas
    Posts
    503
    Sound like a cool vapor valve problem. Manitowoc recommends changing both of them.

  6. #6
    Join Date
    Mar 2008
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    wi
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    Quote Originally Posted by crstephens83 View Post
    ok so i am pretty sure that the cool vapor valves are not wired in parallel, they each come off of a different terminal on the circuit board on that machine, review the schematic. second these machines have been known to act strange on startup after a safety limit shutoff,for the first two cycles or so, and than run properly . Now were your machines off on a safety?
    yes # 2

  7. #7
    Join Date
    Aug 2007
    Location
    Southern,Ca
    Posts
    544
    have you had any more problems since changing the valves, I highly doubt that it is the board, because they do not have a high failure rate? I have had to change the cool vapor valves due to this same problem. is this machine at a restaurant, if so which one?

  8. #8
    Join Date
    Mar 2008
    Location
    wi
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    282
    Quote Originally Posted by crstephens83 View Post
    have you had any more problems since changing the valves, I highly doubt that it is the board, because they do not have a high failure rate? I have had to change the cool vapor valves due to this same problem. is this machine at a restaurant, if so which one?
    yes chilis no problems I watched it drop about a dozen + batches. The cool gas valves were my suspission but I was wonderin if the H/master would be a cause " the left side was working fine prior to changing valves" I'm wonderin becuase I've heard guys talk about mani's takin them for an ride

  9. #9
    Join Date
    Aug 2007
    Location
    Southern,Ca
    Posts
    544
    just curious i have a bunch of those machines at my chilis too

  10. #10
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    Aug 2007
    Location
    Southern,Ca
    Posts
    544
    where is your company based

  11. #11
    Join Date
    Mar 2008
    Location
    wi
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    Quote Originally Posted by crstephens83 View Post
    where is your company based
    midwest il

  12. #12
    Join Date
    Apr 2001
    Posts
    669
    Wildtech,
    I have seen this same problem on several Q1400 with remote condensers. After many service calls I found out what causes this problem. One erratic proximity switch. If one of the proximity switches would have just simply failed, I would not have seen what you're seeing. Unless you can determine which of the two proximity switches is acting erratically, I recommend replacing both of them.

    Jabs

  13. #13
    Join Date
    Feb 2008
    Posts
    96
    Are these CVD machines or traditional remotes? Either way, here is most likely your problem. First of all, it is IMPERATIVE that the refrigerant charge is correct. Assuming that it is, the solenoid coils and bodies on Manitowoc icemakers, especially around two to three years time become erratic. This will burn the best tech out there period. Chili's switched from Hoshi to Mani years ago, big mistake. The CVD's will not work in Chicago or the midwest of any state north of the Mason Dixon line. Why? Ahhh....I have the answer to that too. There is not enough of sensible or latent heat in the harvest loop to have an efficient harvest. But, there is something you can do to fix it. Buy a 5/8 magna check valve and install it on the discharge line between the compressor and the condenser coil. Raise the fan cycling control to 275 and 240, above the headmaster setting. Weigh the charge in and you will have a BETTER working CVD. I have done this and I am highly trained in Manitowoc systems. Make sure your headmaster is working as well. ANYTHING below the stamped bypass rating means a bad headmaster WARNING: Performing this repair will aggravate the factory and they MIGHT void your warranty. If the unit is out of warranty,then go for it. Otherwise, install an Iceomatic remote if you want a great icemaker...30 second harvest times....or a Hoshizaki...if you set it up right and use an approved filter system.

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