12VDC refrig water circulation pump quit - SailNet Community

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  #1  
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12VDC refrig water circulation pump quit

Hi All,

One other failure we had on our cruise was our (25+ year old) DC refrigerator water cooling pump quit, so we had to do the once a day trip to the store for ice. It appears to be a 12Vdc mag drive water pump, very small, very quiet. Those rascals are expensive! I can get a small 12Vdc pump that pumps a 1/2 gpm from Amzon for $25.00. Anyone see a reason I "have" to use a mag pump?

Dave
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Re: 12VDC refrig water circulation pump quit

Unless those amazon pumps are rated for 'continuous duty' operation ... better get a few of them for when you have to constantly have to replace them. The key here for refrigeration water pumps selection is: 'rated for continuous duty'. Otherwise they'll be constanaty shutting down while waiting to cool off repeatedly until they 'quit' for good; sooner to quit for good if they dont have an inbuilt 'over-temperature' cut-out switch.
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Last edited by RichH; 3 Days Ago at 03:29 PM.
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Re: 12VDC refrig water circulation pump quit

I've had great service from the Little Giant line of mag drive centrifugal pumps. But at even $150.00 for 10 years of use, they're considerably cheaper than your $25.00 "deal" pump which might last two years. I guess it depends on how much you enjoy changing out pumps and getting ice.
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Re: 12VDC refrig water circulation pump quit

Dave-
A magnetic drive pump has no seals, so the seals cannot leak and fill your boat with water. And since there's no direct impeller, if it does jam it can't overheat or slag down. Or warp the seal and leak.
So no, you don't have to use one, but yes, there are good reasons to try to.

Find someone who still races electric slot cars, they can rewind the pump motor for you.(G) Of course if you can find a small motor shop, maybe even an alternator shop, they can also rewind it. Odds are the varnish on the wire has failed or the brushes have failed. Brushes, should be replaceable if you can find a source. Wire, probably can be rewound by yourself if you're patient.

Or, once every 25 years, you just replace it. Then rebuild the old one when you're really bored.(G)
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Re: 12VDC refrig water circulation pump quit

If you need to buy ice every day you are either opening the box too often or need to look at your insulation.
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Re: 12VDC refrig water circulation pump quit

Dave, Even though your fridge doesn't run continuously, at least I hope, you should look for a continuous duty pump. You don't have to have a mag. pump. I have installed hundreds of refrigeration units over the years with standard water pumps. What you do need to be sure is that the pump provides the proper flow for the unit. Too much won't hurt but too little and the unit won't cool. Chuck
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Re: 12VDC refrig water circulation pump quit

Quote:
Originally Posted by SVAuspicious View Post
If you need to buy ice every day you are either opening the box too often or need to look at your insulation.
Could be that or could be he's having a cocktail party every night we haven't been invited to.
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Re: 12VDC refrig water circulation pump quit

I just went through this with my holding plate system and went with this diaphragm pump:

http://www.shurflo.com/files/Educati...95-273-200.pdf

Not as quiet as a magdrive but self-priming and run-dry capable. Got 8 years of use out of the old one, which works out to about $1.50/mo.
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Re: 12VDC refrig water circulation pump quit

Quote:
Originally Posted by SVAuspicious View Post
If you need to buy ice every day you are either opening the box too often or need to look at your insulation.
35 year old vessel... OK the "ice box" insulation is not what you call "polar proof". We were also getting ice for the 2 ice chests on board.

IStream, thanks for the pump data, looks good.

Because you all bring so much expertise to the table, I think I'll: Put in some insulation, and probably give in and get a mag pump. This thing is on a wooden bulkhead that amplifies anything (the bilge pump wakes Davey Jones when it turns on) , so I want to keep it as quiet as possible. Thanks!

Dave
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Re: 12VDC refrig water circulation pump quit

The mag drive motors I've seen were small enough to hang free on the mounted hoses,, no vibration into hull.
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