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Old 06-18-2018, 09:55 PM   #21
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Latest update on fridge cooling issue

In reading all these suggestions, it is apparent that many of us trawler owners experience the same issues with fridge ventilation. I own a Property Management company here on island with many staff specialists...I invited my reefer tech for a afternoon on the boat with a motive...he took the fridge out of the cabinet and made several suggestions...one I was very surprised on...he said you should not have a fan blowing on the compressor, as it needed to heat up the gas to go up to the cooling fins...so we took out that fan I installed in previous threads. Then he installed one of my low draw amp fans pointed upward to force the hot air towards the vent by the stove top. Then drilled a 4" hole as suggested by many on this thread for ventilation inbound from the side cabinet, and also one facing outward to salon (hidden with vented chrome covers) to draw cooler air into that backside of fridge.



The results amazed me...now my 18 year fridge sits at 4.5 on the dial (7 is max), cycling regularly, ice in freezer in 6-8 hrs (when before it had to be 18-24 hrs). Thank you all for the suggestions on resolving this common ventilation problem for increased fridge/freezer operation. Here in the tropics, ice cold Heineken's are just mandatory out on the water.
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Old 06-18-2018, 10:43 PM   #22
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Suntansailor, did you install additional insulation on the sides of the box too?
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Old 06-19-2018, 08:07 AM   #23
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Insulation install

No, did not install any insulation. My tech guy had a cool instrument that measures temp on an long flexible wand. After what he did, and when we put it all back together in the cabinet, it showed 3-4 degrees cooler behind the fridge, so I think all the fans and ventilation holes seem to be working.
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Old 06-19-2018, 08:09 AM   #24
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Originally Posted by suntansailor View Post
No, did not install any insulation. My tech guy had a cool instrument that measures temp on an long flexible wand. After what he did, and when we put it all back together in the cabinet, it showed 3-4 degrees cooler behind the fridge, so I think all the fans and ventilation holes seem to be working.
Thanks.
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Old 01-30-2019, 08:52 AM   #25
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NovaKool cooling update

Just wanted to share this update on improving the cooling efficiency of my NovaKool RFU6200 on my 2000 MS 390:

After the 3 fans installed (outlined on previous thread), I still was not content with the cooling, so went to the experts at NovaKool.

Spoke to Jim/Stuart and they were extremely helpful, not to mention full of knowledge with 20+ years with the company.

They suggested I replace the old style 1/2" foam insulation on the back side of the unit with new 3/4", and at the same time replace the plumbers putty that seals the foam to the metal casing of the fridge/freezer. The appliance store manager where I bought the foam piping also added his two cents, saying why not wrap the foam with the metallic shiny duct tape that air conditioning staff use to further insulate.

The results were just amazing...was able to lower the thermostat from 4 down to 3 (7 being the highest), in 6 hrs reached 18 degrees in freezer (where previously I had achieved 30 with three new fans installed), and fridge now is at 37 no problem. The unit cycles on off now, so using much less amp hours than before.

The project took just over 90 minutes, and so well worth the effort of renewing life back into a 1999 manufactured unit.

Pictures say it all, with before and after.
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Old 01-30-2019, 04:55 PM   #26
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My problem involves humidity inside the box allowing for frost build up.
Yes, I replaced the door seal, no noticeable effect. Tomorrow is 'defrost the fridge day'.
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Old 01-30-2019, 05:22 PM   #27
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That's where the Fridge Optimizer can help. I'm saving my boat pennies to buy one.

https://stainlesslobster.com/fridge-optimizer
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Old 01-30-2019, 06:02 PM   #28
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That's where the Fridge Optimizer can help. I'm saving my boat pennies to buy one.

https://stainlesslobster.com/fridge-optimizer
It is necessary to inspect the entire fridge for air leaks into the box. Air leaks will be the biggest contributor to the humidity inside the box.

I have the 3/4 in foam insulation board and tape.
Upon recent recommendations, I will need plumber's clay and silver foil too.

Yup StainlessLobster waiting to be installed. Saving up installing it until I get the collector box and vent hose to remove the heat from the area behind the fridge. I think it will take all day to do all the modifications.

How do you feel about installing a fan inside the box?
Also, has the discussion of the tray 'in or out' been resolved?
Also, the placement of the temp sensor bulb in the main box?

Understand, I am living aboard so the door opening and closing is similar to that of a house fridge. That too is adding to the box humidity.

I will be leaving the boat for 2 months so I shall wait until I return to modify the fridge. It would be best to be onboard to monitor the fridge rather than install it and walk away for 2 months. Once I build confidence in all the modifications then, I will feel more confident with the 'system.'
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Old 01-30-2019, 06:35 PM   #29
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Originally Posted by OldDan1943 View Post

Yup StainlessLobster waiting to be installed. Saving up installing it until I get the collector box and vent hose to remove the heat from the area behind the fridge. I think it will take all day to do all the modifications.

How do you feel about installing a fan inside the box?
Also, has the discussion of the tray 'in or out' been resolved?
Also, the placement of the temp sensor bulb in the main box?
I'll be watching for your review of the installation and operation efficiencies on this unit.

I referenced the engineer's recommendation for an exhaust fan (not intake fan) here on post 12. Vent in from the bottom and out at the top for my unit.

Trawler Forum - View Single Post - NovaKool fridge freezer issue resolution

If I had technical questions about the installation I'd call the company and ask. I bet they'd have good advice for you.
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