What causes the bow?
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  1. #1
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    What causes the bow?

    Ive been working on Hoshizaki's for about 5 years now and Ive seen several flavors of failure. Most of them are either self explanatory or can be figured out. I came across this evaporator at one of my accounts and it caused all kinds of problems making ice, a bunch just came out as snow. The bow of this evap was actually a lot worse when it was installed in the machine.

    My question is, what causes the bow, specifically? What is the process?

    Ive seen ice form in between and expand causing the separation we love so much, but this evap is still attached to the tube.
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  2. #2
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    If I had to guess I would say multiple freeze ups.
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  3. #3
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    From my experience, that bowing of the evaporator is usually caused by severe freezeups where the ice builds up between the evap sections and/or between the sidewall and the evaporator.

    In your pic, it appears to have had freezeups on the RH side and in between the two sections.

    Since you mentioned freezing in the middle of the evap sections, here's a pic I took of one where the plates were expanded outward long before any tube separation got started.

    Name:  Hoshi_Evap.jpg
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  4. #4
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  5. #5
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    I have those sections both on my PC and in print. Nowhere does it specifically say it causes an evap to bow.

    What i was after was a progression to see if it made sense in my head.

    Freeze up-> multiple freeze ups on top of one another--> ice expands and pushes against the wall and bows the evap.

    Thanks to the guys who responded.
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  6. #6
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    Approx. how long does it take to change out an evaporator like that? Is it fairly easy, or a big pain in the a? I've seen a few bad ones but am usually able to talk the customer into buying an entire new ice machine, so I haven't had to change one out yet.

    P.S... My vote is for too small of a water inlet line and/or plugged up water filters as for being the cause.

  7. #7
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    Mar 2007
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    What model was that outta? How old would you say roughly?
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  8. #8
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    Jul 2002
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    SE Texas
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    Well, I have never actually run across a bowed coil, so I have no experience to tell you specifically the progression of events that led to your bowed coil. However, I have gone on calls and witnessed what a stuck closed bin thermostat does. I could see where, if this situation was left unresolved for a significant amount of time, the further buildup of ice could bow the evaporators.
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  9. #9
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    It dosen't take a long time. Just once could trash one

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  10. #10
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    Quote Originally Posted by itsiceman View Post
    What model was that outta? How old would you say roughly?
    It's a KM-500MRF from 1999/2000

    Yeah, this one was a first for me. Never had to do a bowed coil, just a seperated one.
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  11. #11
    Join Date
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    Quote Originally Posted by ammoniadog View Post
    Approx. how long does it take to change out an evaporator like that? Is it fairly easy, or a big pain in the a? I've seen a few bad ones but am usually able to talk the customer into buying an entire new ice machine, so I haven't had to change one out yet.

    P.S... My vote is for too small of a water inlet line and/or plugged up water filters as for being the cause.
    Hoshi gives you 4 hours to do one. It is actually easier than you think. Make sure you have a rivet gun though, because you will need to replace the mounting brackets. (or reuse the old ones either way you need a rivet gun)

    I did this one is just over 2.5 hours--gotta love that G5 Twin!
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  12. #12
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    Oct 2011
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    Low water pressure. No other reason for repetitive freezeups.
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  13. #13
    Join Date
    Mar 2007
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    Cold water too and plus I noticed they started putting smaller inlets to keep the water use down
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