Hoshizaki Km-630MAB...not harvesting properly

[Freezeking2000]

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

[secorp]

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.

[trippintl0]

Every Hoshi I've seen has a stainless steel evaporator. They are susceptible to scale buildup though, which will cause harvest problems.

[joemach]

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.

[gsxrsquid]

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..

[DLZ Dan]

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.

[itsiceman]

Not really guys
FWIW
The tiny hoshis like scotti and mani use a plated copper evaps.
Keep the lime a way outta those

[DLZ Dan]

True- i should be clear...

The KM cubers in question have stainless, not nickel-plated evaps.

Thanks iceman-i gotta be more specific.

[youngsamuel]

I decided to resurrect this thread because last night I searched this forum to find out why the Hoshi I was working on would not harvest ice soon enough (2 beep alarm). It was the water cleaning valve. It was left open so the machine would make ice but not harvest. Water would come in the inlet and run straight down the clean valve and to the trough. Thanks for the help. I closed the valve and voila she was harvesting like a champ. This comes after two days of head pounding. No one at Hoshi even suggested water as a possible problem. I changed out two txv's and a Liquid line valve

[danbb]

I decided to resurrect this thread because last night I searched this forum to find out why the Hoshi I was working on would not harvest ice soon enough (2 beep alarm). It was the water cleaning valve. It was left open so the machine would make ice but not harvest. Water would come in the inlet and run straight down the clean valve and to the trough. Thanks for the help. I closed the valve and voila she was harvesting like a champ. This comes after two days of head pounding. No one at Hoshi even suggested water as a possible problem. I changed out two txv's and a Liquid line valve

Don't they have a microswitch that won't let the machine run unless the valve is closed?

[joemach]

Don't they have a microswitch that won't let the machine run unless the valve is closed?

That microswitch goes bad sometimes and gets bypassed with a wire jumper. I've seen it before.

[itsiceman]

Never seen someone bypass the switch and leave it open. So does it freeze behind the plate preventing harvest then. How many cycles does it take to trash the evap running like that lol

[gsxrsquid]

My experience is 98% of ice machine problems are water with a few electrical and very few refrigerant. Not to say it doesn't happen. Big problem with hoshis is the little pieces of plastic breaking off of the ice deflector and blocking the spring loaded valve open so it always dumps.
Once or twice over the years when cleaning a hoshi I left the valve open but it didn't take too long before I felt stupid and opened it. never ran across one where someone else had closed it though.
One curious thing I have experienced is if i take the float switch apart and clean it real well it never works right again. Absolutely no idea why since it is a sealed magenetic switch but it happened on a number of occasions. Now if the float valve is all nasty I replace it and eliminate that problem.