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  1. #14
    Join Date
    Jan 2011
    Location
    NW Iowa
    Posts
    46
    We had a manitowoc one time do just about the same thing, and we couldn't figure out why it wasn't harvesting all of the ice- everything looked fine one it, but when it went to harvest it only harvested about half the ice on the grid. after checking it and rechecking it several times, we found out that there were little burrs on the grid where someone had chipped away at the ice with something sharp- causing some of the ice to catch on the burrs and not drop.

  2. #15
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,558
    Quote Originally Posted by allamericanclow View Post
    sounds like a hot gas valve failing to open.
    So is it a 3 min harvest or a 15 min. harvest?
    No hot gas or bad TXV would get you a long harvest.

    From what I'm getting from the story it sounds like its cycling too fast thru harvest but, with out a time............

    To me sounds like the suction line is getting too warm too fast and not warming the whole plate to me but with out the suction temp..........

    “If You Can Dodge A Wrench You Can Dodge A Ball”

  3. #16

    so like i was saying

    3 min is a good valid harvest when u hear the crack u can hear the hotgass open pressure rise is fast. with a manotowic pressure needs to get over 50 for at full harvest. so if half the plate drops and half doesnt u can b assured the hotgas valve is bad.. unless ya pressure gets over 50... and it doesnt drop. well if u have an equal part that doesnt drop its the hotgas valve. and if u saw chipping on the plate from someone chipping ice then u need to get that person away from ur equipment... 3 words ho t gas valve. been there domne that u described it to a t as wlell as the manotowic

  4. #17
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,558
    aac On a Hoshi 3 min sucks if all the ice has not fallen off yet.

    For harvest cycles between the two

    Mani uses HG and gravity only and sometimes air.

    Hoshi uses water mainly and some HG.

    IMO on a Hoshi the HG valve is there to just slam shut the txv

    Manitowoc should be left out of this thread or the poor guy will be going in circles
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  5. #18
    Join Date
    May 2006
    Location
    Amory Mississippi
    Posts
    998
    Quote Originally Posted by itsiceman View Post
    aac On a Hoshi 3 min sucks if all the ice has not fallen off yet.

    For harvest cycles between the two

    Mani uses HG and gravity only and sometimes air.

    Hoshi uses water mainly and some HG.

    IMO on a Hoshi the HG valve is there to just slam shut the txv

    Manitowoc should be left out of this thread or the poor guy will be going in circles
    I was thinking the same thing. Mani and Hoshi are two different animals.

  6. #19
    Join Date
    Aug 2004
    Location
    Des Moines, IA
    Posts
    76
    Didn't see a hi press reading, since u cleaned a plugged condenser the system may be under or over charged and or look at the headmaster. does the outdoor fans shut off. Imo Ur just running out of hot

  7. #20
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    6,558
    Quote Originally Posted by gsxrsquid View Post
    I was thinking the same thing. Mani and Hoshi are two different animals.
    This reminds me of Penn and Teller
    when Penn tells you how Teller is doing the trick (even in slow mo) and you still can't see the slight of hand
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  8. #21
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,570
    Poor water flow over the evap during harvest will cause a pre mature defrost termination. The water line needs to be 1/2 " and no pressure drop to the unit from dirty water filters. The fresh water flowing over the evap is used to cool the plates and extend the defrost.

    http://www.hoshizakiamerica.com/manu...30M_B_serv.pdf
    Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced

  9. #22
    Join Date
    Dec 2003
    Location
    Middle of Florida
    Posts
    2,159
    I am Assuming your suction pressure is high enough to harvest, seeing that some ice harvested. I would think you may have lost the nickel coating on the Evaporator. especially if it is forever old and never been cleaned, also you may have cleaned what was left of the coating with to much acidic cleaning fluid.

    As far as I know they do not make a nickel coating in a spray can.
    If common sense is so common how come so few of us have it!

  10. #23
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    645
    Every Hoshi I've seen has a stainless steel evaporator. They are susceptible to scale buildup though, which will cause harvest problems.

  11. #24
    Join Date
    Sep 2007
    Location
    State College, PA
    Posts
    1,025
    Quote Originally Posted by trippintl0 View Post
    Every Hoshi I've seen has a stainless steel evaporator. They are susceptible to scale buildup though, which will cause harvest problems.
    That is all I have seen. Never saw nickel plated Hosi.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  12. #25
    Join Date
    May 2006
    Location
    Amory Mississippi
    Posts
    998
    When it is in harvest feel all of the suction lines at the evap. They should all be hot or at least very warm. If some of them are cold see if that is the part of the evap where the ice is sticking. Make sure you have water flow because if you don't have good water flow it isn't going to harvest.

    If I recall Hoshis has nickle evaps and the Hoshi cleaner works great on them but if you use it on machines without nickle evaps it strips the plating..

  13. #26
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,307
    The suction line thermistor terminates at 46 degrees so check the suction line temp with a probe.
    You may have a buildup of crud in between the evaporator plates and this hinders harvest. Hoshizaki uses not only hot gas bypass but water to spread out the heat to complete even harvest.
    If the evap looks like this from the top...] [
    then where you have to concentrate is ]here[

    If this is gummed up with mung, you wont get a complete harvest.

    If this is clear, make sure the thermistor is reading the correct temp and not terminating early.

    Edit: And yes, all of Hoshizaki's evaps are Stainless and not coated with nickel.
    Every customer you take for granted today will be someone else's tomorrow.

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