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Old 02-07-2015, 09:06   #1
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norcold and fans

I have .a norcold 7 cubic foot refrigerator. it struggles to keep the proper temperature in the South Florida heat ,with Cabin temperatures in the 90s. it has one 24 volt fan blowing on the compressor. I was thinking of adding another fan or two to ventilate the compartment the refrigerator. sits in. Should I blow these fans across the coils or Or tru the vent for the compartment
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Old 02-07-2015, 09:34   #2
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Re: norcold and fans

Norcold refrigerator fix.
I posted this on another forum recently, maybe this will help you. After doing this the fridge cycles on and off and got cold, so much so, we had to defrost the freezer within 2 weeks.

As a new owner of 47014, one of my first tasks to make the Admiral happy, was to check into why the refrigerator wasn't getting very cold. Early this month the temp in Portland got pretty high to mid 90's and the refrigerator was struggling to keep up.
After pulling the unit out of the rather tight cabinet I found the problem. My unit had two electric fans that cycle on when the unit starts up, only mine never shut down. Upon further investigation, I noticed the large fan (there is a small 2.5 inch and a larger 4.1 inch) wasn't turning on. This fan is directly under the condenser tank and is supposed to blow air across the condenser tank. Now this fan looks just like the cooling fan that computers use to cool the cases. So much so that the mounting holes are in the exact location, so off to the local computer store in search of a replacement. I pick up two thinking it would be nice to have a spare. Get back to the boat and start the depacking Process only to find that computer fans now a days are four wire with a connector plug and require it to be controlled by the mother board in order to operate.
Starting all over again, I get on the Norcold site and find that the replacement fans are $72.00 each plus shipping but are not in stock. So off to the local chandlery for solutions. At Ocean Marine the owner, Kim (who by the way is great to work with) had about a dozen of these fans hanging on a wall so I pick the best 2 and she even tested them for me to make sure they worked. Now these fans have the required 2 wires I needed and for 10 bucks apiece I figure I got a good deal. Back to the boat, again.
I install one of the fans and plug in the unit, It works great. Picture this if you will. When the unit is out of the cabinet, it now sits between the cabinet and the galley counter. You have to climb over the counter to get to the other side. By the way our galley is a center galley, passageway down to berths is on the port side, passageway up to pilot house is on the starboard with galley in between.
So now I'm thinking, if one fan works well, why not add an additional fan to help draw the air out of the rather tight cabinet. After all, the current draw on these fans is so light, it just might reduce cycle runs of the unit. So I install the second fan on the inside of the port vent and wire this in series to the other fan. The reason for wiring in series is, I wanted to know if a future fan failed we would know right away. Test it and it works great! Now I slide the unit back into the cabinet, after I taped up the Teak trim and grab rail with blue painters tape ( trust me, do this before you attempt to remove the unit in the first place, I didn't ) reinstall the new screws to retain the unit in place and make myself a cocktail for a job well done.
Now the admiral is so happy that she decides to make me a very nice dinner. Only she is having a problem getting the gas stove to light now. So now, Mr Handyman has to fix the stove, only to find out that the extra fan is now blowing all that warm air from the cabinet directly onto the stove top and not allowing the burner to light. I don't claim to be an engineer, but am rather handy with tools.
But by this time Mr Handyman is in no mood to pull the refrigerator back out again, so on to the second cocktail and fire up the BBQ. Dinner was a success, and as I'm making cocktail number 3, I'm getting Ice from the Raritin Ice maker that just so happens to be right behind the refrigerator cabinet, I notice that the Ice maker is generating an awful lot of heat from its little cabinet that is directly under the watch berth in the Pilot House and right behind the refrigerator cabinet. You guessed it, an ah ha moment.
Day 3. I again remove the refrigerator unit from the cabinet, after taping the wood trim again, and after a bit of carpentry work the extra fan is now located inside the Ice maker cabinet drawing air from the refrigerator cabinet and venting out the ice maker cabinet hatch. Reinstall the refrigerator and make myself a job well done cocktail.
So the end result is, the refrigerator now cycles on and off less often, the ice maker is running so much cooler and making ice faster.
And now it's on to the next project, don't ya just love boat repairs?

John and Tracey
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Old 02-07-2015, 10:19   #3
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Re: norcold and fans

Quote:
Originally Posted by CrustyChief View Post
Get back to the boat and start the depacking Process only to find that computer fans now a days are four wire with a connector plug and require it to be controlled by the mother board in order to operate.
For future reference, two of those 4 wires are for full-speed, so if you cut off the plug and just wire the +/-12V to those, the fan will work at full speed (which you usually want). Typically, the wire colors are red/black, which makes it easier.

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Old 02-07-2015, 11:06   #4
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Re: norcold and fans

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Originally Posted by colemj View Post
For future reference, two of those 4 wires are for full-speed, so if you cut off the plug and just wire the +/-12V to those, the fan will work at full speed (which you usually want). Typically, the wire colors are red/black, which makes it easier.

Mark
Thanks Mark, the fans I bought were 4 wire and all the same color. After cutting the connector off I tried every possible mix of trying to get the fan to work. At this point I started the ole Goggle search and several of the sites said the fans were controlled by the motherboard. I gave up and moved forward. In the long run it all worked out.
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