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Fridge efficiency

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Bruno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruno Quote  Post ReplyReply Direct Link To This Post Topic: Fridge efficiency
    Posted: 08 August 2017 at 21:20
If you look fore of the fridge, you will find an air duck reaching the compressor compartment giving you more room to cool the compressor. One could possibly repositon the compressor or a fan here on the cupboard plywood extension reaching out from under the seat. 

Keep your fridge as dry as possible. The humidity will condensate on the evaporator and create more problems.

You could also have humidity in your freon system too. The humidity will freeze and restrict the freon. If you call a technician, ask him to bleed the system before refilling. According to Isotherm, You should have a pressure of 6 psi when fridge is on and between 50 to 60 psi when turned off.

Bruno

Hanse 400, 2010 Hull 660
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Mike2145 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike2145 Quote  Post ReplyReply Direct Link To This Post Posted: 31 July 2017 at 19:30
Although I have a 320 I found that the compressor fan and fins were partially blocked with dirt.  Replaced the fan with a better quality computer fan and added a separate fan to remove the warm air from the under sink cupboard where the compressor sits.  I have cut some additional holes in the floor (the hatch where the sea cocks are) and this, i think, helps draw in cool air from the bilge.  
The fridge is now consuming a lot less electricity.  Mainly due to cleaning the compressor fins I suspect but removing the heat from the compressor can only be a good thing. 
As a side effect its quieter with the new quality fans. 
Cant take a joke, don't buy a boat.
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silversailor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote silversailor Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2017 at 21:36
I have added a small 12V computer fan at the base of my fridge. Also, put 2 soft sided pieces of product that can freeze and then be removed to keep a cooler cold. Pull one out and drape it over the horizontal grid that separates the two sections.  When it defrosts I switch it with the one in the freezer.  Sometimes I prop open the freezer door. The exterior top of the fridge gets very warm so I use a white neoprene pad to cover it.  Reflects the heat and provides addl insulation.
Silversailor
South Haven, MI USA
S/V Legacy
Hanse 370e, #9
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mike pearce View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mike pearce Quote  Post ReplyReply Direct Link To This Post Posted: 18 July 2017 at 15:55
Thanks for the various replies and the potential solutions. Some easier than others to try although improving the ventilation sounds good for starters & checking the voltage. The acrylic sheet to compartmentalise the fridge is an interesting idea.
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Pepote View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pepote Quote  Post ReplyReply Direct Link To This Post Posted: 16 July 2017 at 09:50
With my system, I get -20 ºC in the freezer and 4 ºC in the whole refrigerator
Jesús
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 15 July 2017 at 09:59
In my fridge I have placed a perspex acrylic sheet in the middle of the box, so the fridge is separated in two. The storage under the cooling unit is then somewhat colder than the space behind the lower door.  The temperature difference between the two compartments is regulated with the number of small holes drilled in the acrylic sheet.
In the fridge the temerature is now 6, respectively 9 degrees celsius.
Cook
Freya Hanse400#27
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 15 July 2017 at 09:45
This problem is covered in several topics, e.g. "isotherm fridge failure", where it among other issues, is explained, that it is important that there is sufficient voltage at the compressor.
In my boat there was a voltage drop of 0,9 V from battery to compressor due to the small diameter/length of the current supply cable.
Cook the Captain

Freya Hanse400#27
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Pepote View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pepote Quote  Post ReplyReply Direct Link To This Post Posted: 14 July 2017 at 20:45
Hi,
The compressor is located in a small enclosed space Dead.
It is necessary to improve its ventilation with the following works:
1º.- Opening an air intake through the area of the compressor, near the kitchen, to facilitate its ventilation.
2º.- Improving ventilation around the compressor with a 12V fan to help move the hot air away and reinforce cooling of the refrigerator
3 .- Facilitate the exit of hot air from the chamber in which the compressor is located, opening some gap in the upper area.
 
If it is not done, it will never work well and will not break the compressor when it can not be refrigerated.
Jesús
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Peter Russell View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Russell Quote  Post ReplyReply Direct Link To This Post Posted: 14 July 2017 at 20:11
Even in the UK I have to defrost every 3 days or so - that may be down to a relatively humid atmosphere here.  A messy job and of course everything gets warm before you can reuse the fridge.  I occasionally chip the ice off, but you need to be careful not to damage anything.
Peter Russell

Hanse 370 hull 499 "Outnumbered"



http://outnumbered.the-russells.net
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mike pearce View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mike pearce Quote  Post ReplyReply Direct Link To This Post Posted: 14 July 2017 at 07:05
Thanks for the comments Peter.
I have removed the cover plate by the compressor and try to keep the door open to aid air circulation. It may assist but it's hot out here !
In an effort to further improve matters I have cut some polystyrene sheets about 200 mm thick and placed them at the floor of the main fridge compartment. I have a similar sheet directly behind the front loading door and try not to use this to access the fridge unless necessary.
Taking advice ffrom Isotherm they reckon I need to keep the ice box / evaporator 'dry' and clear of ice to ensure it works most efficiently. Problem with that is we have yet tio find a solution without turning off the fridge to allow it to thaw and then moping out the water! Not sure this should be necessary.
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