fridge water pump advice

ribrage

ribrage

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I need to replace a burnt out water pump for my on board fridge, the original is only 3 years old and for some reason is a 12volt pump , Ive checked the supply voltage and its 24 volts not twelve ?

so im In the market for a 24 volt water pump - any preferences or advice ?
 
A few thoughts here

1 You say it is burnt out, are you sure it is the pump motor that is the problem, not the valves kit which wear out? (Clue If you can hear the motor turning but no pump pressure, then it will probably be the valves)

2 If it is an Isotherm system DO NOT buy the pump from them, the last pump I got direct from Shuflo for about 30% of the Isotherm price

3 I am assuming your vessel and fridge compressor is 24 volt, if yes then a 12 volt pump will wear out quicker
 
Hi john

I pulled the motor apart a few weeks ago it's honking, the brushes are a mess and black soot every where smells like it caught fire so definetly the motor

The system is 24 volts and the original pump fitted in manufacture is 12 volts, I've messagesd a few companies that advertise pumps but they only have fresh water pumps or 12 volt

I need to find something a bit sharpish as currently I'm running a hose pipe on trickle from the quayside and into the heat exchanger to keep the fridge working.

So I need a 24 volt circulation pump not a demand pump like fitted to the drinking water, I thought the fishing boys used this type of pump in bait wells but not found them on line and the chandleries couldn't give me an answer here

Any ideas ??
 
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TB

ASAP were one of my first emails. They sent me back info on one model - when I looked at the blurb it was for fresh water only.

I asked what options they had and I was told no other options available.

I found some American sites offering live well pumps but only in twelve volt .... Frustrated
 
The pump recommended to me for my Isotherm Magnum by Shurflo is a Aquaking Junior 2.0 and is described as a fresh water pump, it has been running fine for about 4 years.

We are full time live aboards so it is in use every day

Good luck
 
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I assume the pump is used to put seawater through the heat exchanger on a once-through basis? This is the arrangement I have. The boat is 12 volts but I run the Jabsco Par max 1 pump on 6 volts, using an Isotherm 12 to 6 volt converter. Used like this Jabsco suggested it would run indefinitely. It has been in use for the past four or five years with no problem. It seems likely yhat there is an equivalent 24 - 12 converter, or even better, a 24 - 6 version.

Edit: Google 'voltage reducer'. Loads of them at around 10 amps from £20. The Isotherm one is about ten times as expensive.
 
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Vyv

Yes the water is drawn in from the hull fitting then circulated through the refrigeration unit and pump back over board above the water line.

I've had very little use from this unit and have never been comfortable with it when working it just didn't feel right.

Any way the pump started smelling after running for even a short time so I pulled the pump off and stripped it apart - it's cooked !

I called the company that supplied the complete refrigeration unit as the pump label was 12 v even though the system is 24v and we were told it was correct ?

I checked the supply voltage to the pump and its 24 v not 12 v so I assumed the pump was wrong from day 1

I'm going to pull it apart again and check where the supply comes from to see if it goes back to a voltage dropper - maybe that's failed and caused the problem ?

12 v pumps are much more common and way more choices so a 24 to 12 voltage dropper may be the answer

That's my afternoon gone ... Pass me a screw driver (again)
 
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I have had an alternative method pointed out by son Owen. Google '12 volt motor speed control' and you will find many. Most seem to accept up to 50 volts input, control by PWM down to nearly nothing. I have ordered one from a Leicester supplier on Ebay, £12 delivered to Greece.
 
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