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post #1 of 6 Old 04-04-2013 Thread Starter
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Anyone have any thoughts on upgrading an OLD Grunert refrigerator? This is so old even ten years ago the people at Grunert knew nothing. Its nothing if not reliable. It is a belt drive Tecumseh compressor drvien by a large frame 1/4 hp Century motor. Survived a sinking, and after being recharged works as good as Ever.. But NOISY. It can't go on forever though, and even Tecumseh no longer has parts.
Plus it is an energy hog: uses about 36 amps when cooling.
But I don't know where to start with an upgrade that will use the existing three compartmen layout, w freezer in center.
Thoughts? Ideas?

Last edited by mickeyrouse; 04-06-2013 at 08:07 AM. Reason: Correct mis-spelling
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post #2 of 6 Old 04-05-2013
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Re: refrigeration

I only have two suggestions: Use much more insulation than you think is necessary (125mm/5" and above) and get a good compressor - Danfoss makes some great ones.
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post #3 of 6 Old 04-05-2013
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Re: refrigeration

Insulating the box for efficiency is a good idea. You can't over do it.

36amps. OMG. That's just not practical, unless always at the dock.

You'll have to explain what you mean by three compartment a bit more, but I assume you only have one compressor, from the description. I'm guessing that the cooling plate is in the freezer and the fridge section bleeds cooling from it. I suspect you will have to R&R everything from the cooling plates to the compressor. It can be a DIY job, but you need to be very careful not to contaminate the system with even the smallest piece of dust or leaving an air gap in the refrigerant.

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post #4 of 6 Old 04-05-2013
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Re: refrigeration

I have a similar lay out. One compartment freezer and two fridge. I removed the engine driven sea frost and installed two isotherm systems. One for the freezer and one for the fridge. Not a complicated diy install. Draws about 8 amps w/ both compressors are running at start up. Uses about 40 ah a day.

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post #5 of 6 Old 04-05-2013
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Re: refrigeration

Freezer in the middle sounds like an interesting idea. That way any cold leaking through TWo sides of the freezer gets put to good use cooling down the reefer boxes. Although, two boxes will in turn lose more cold (gain more heat) than one big box, so the good idea might fall short when real math and modern insulation is used.

It might be worth considering redoing the whole installation.

Is your setup just cooling the freezer compartment and bleeding off cold air into the other two boxes? Or do they all have plates (whatever) in them? Is having two reefer boxes working out for you, versus just having one?
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post #6 of 6 Old 04-06-2013 Thread Starter
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Re: refrigeration

Whole new installation is the idea. Only plan to use the existing box with the partitions presently in place. However, cant figure out how to remove existing evaporator coils without tearing up the lid/top of the reefer box, which is also the chart table. (No navigating while cooking) It appears that access for removal may be provided by removal of the reefer box panel facing the cabin, but I'm not sure, and can't find anyone who has done anything similar.

Last edited by mickeyrouse; 04-06-2013 at 08:04 AM. Reason: Mis spelling
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