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Topic ClosedRewire T-stat fans

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kymooses View Drop Down
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Direct Link To This Post Topic: Rewire T-stat fans
    Posted: 03 May 2012 at 11:44am
Never got around to doing this last season but am thinking of doing it today.  But I need help cause I'm not exactly sure of what I'm doing.
 
In the pic below is what to my knowledge is the t-stat switch which decides when and if to turn on the 2 computer fans below the fins of my fridge to help cool the coils.
 
I want mine to run all the time.  I'm probably wrong in assuming it's this easy but can I just pull the wires from the t-stat switch and then stick the 3 fan wires together thus bypassing the t-stat and having the fans run all the time.
 
Seems the likely fix to me.  Right?  That switch is what triggers and then completes the circuit and allows the fans to come on, so removing them from the t-stat and wiring them together then equals fans on all the time?
 
It's likely I'm missing something or completely out of left field with this idea, so any help is appreciated!
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kymooses View Drop Down
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Direct Link To This Post Posted: 03 May 2012 at 2:47pm
Okay answering my own question here in case anyone in the future wants to do this. 
If you have the RM8501 Dometic and it's not cooling to your expectations you're in luck because you already have 2 12v CPU fans in the back.  Hooray! 
The little T-stat module there on your cooling fins  is easily just disconnected and then as I had thought just connect the two sets of wires that were previously connected to that switch and voila you have permanent cooling fans.
 
I'll likely head to Radio Shack or something tonight and buy a switch so that they aren't running full time in between trips but I'm happy with them being on and there is a nice drop in my fridge temp already.  I've even frozen a bottle of water!
 
Also doesn't hurt to have a multimeter probe to get more accurate temps, the little fridge thermometer I bought at Wally world was insanely inaccurate.
 
A quick question though, does anyone ever remove their top fridge cover while they are camping?  I noticed a pretty rapid near 2 degree drop in temps just by popping the cover off and laying it next to the Pod.
 
Maybe not necessary, but I like my milk and OJ to be cold in the mornings and I prefer not to have them stored in the icy cooler.  2 degree colder OJ makes me a happier Podder!!   LOLLOLLOL
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TIDALWAVE View Drop Down
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Direct Link To This Post Posted: 03 May 2012 at 7:01pm
I have couple of extra small solar panels and small 12VDC fans that I might rig up to add more fan cooling.  
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techntrek View Drop Down
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Direct Link To This Post Posted: 03 May 2012 at 8:28pm
A big modification often done (I did it on my popup) is to add a horizontal baffle between the bottom half of that compartment and the top.  The idea is to force the natural convection to flow over the fins and not just up in the dead air space.  You should try that with and without your recent modification.  If you dry camp you will want to keep that thermostat, if possible.
Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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kymooses View Drop Down
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Direct Link To This Post Posted: 03 May 2012 at 9:47pm
Originally posted by techntrek

A big modification often done (I did it on my popup) is to add a horizontal baffle between the bottom half of that compartment and the top.  The idea is to force the natural convection to flow over the fins and not just up in the in dead air space.  You should try that with and without your recent modification.  If you dry camp you will want to keep that thermostat, if possible.
 
Not quite sure I understand your baffle and where and how that works.  More infor would be great!
 
 
But this is even more annoying.  I finally see good temps throughout the day, 36-38-39 degrees with minor changes in between, and the freezer it was at 10 degrees at one point today.
 
However now that the sun has set and it's actually cooler outside, no where near as hot as it was earlier and no sun to heat things up, the internal temperatures of my fridge are rising.  I'm sitting at 40-41-42 ish and the freezer temp is still cool but up to 23 now.
 
I'm complete baffled, and no there is no icing inside on the fins of the freezer so that isn't the cause, but I just can't for the life of me understand how it's getting warmer in my fridge when it's cooler outside?!?!   WinkWinkWink
 
I hate this fridge.
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Bill-GA View Drop Down
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Direct Link To This Post Posted: 04 May 2012 at 10:19am
This may be relevant ... I have a small (inexpensive) Refrigerator/freezer combo in my garage and I've noticed that when it goes down into the 20's outside (unheated garage goes to 30-40) the freezer stuff begins to MELT!!!
 
This is a cheap frig/freezer and the only thing I can rationalize is that the Freezer works as a slave off the refrigerator (single compressor/single temp setting in the REFRIGERATOR).  Since the refrigerator part is happy with the cold temps, the compressor does NOT run and so the freezer starts to give back it's cold ,,,  hence the few things like ice pops are melted then refrozen when I examine them in the spring.  Initially, I thought the unit was just defective  -  but it may be more of a design and/or location usage issue.
 
This may account for why the colder weather doesn't make for better freezing ...  in fact it does just the opposite!   Next time I buy a frig/freezer, I will get dual controls!
Bill & Bev
13 yr old dachshund 'Elsa'
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kymooses View Drop Down
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Direct Link To This Post Posted: 04 May 2012 at 11:27am
One thing I've read but I can't find but only a few articles that even mention it.
 
Seems to be an Urban Legend of RV fridges, but apparently they may have a warming cycle that they go through once a day where internal temps will rise to help melt ice if there is any on the freezer fins.
 
The only thing I've seen to try is to turn off your fridge power the first night you're out camping briefly before you go to bed the first night and then the "supposed" warm cycle would hopfully occur during the night when you're not already opening the door and using the fridge, thus preventing additional heat entering the fridge.
 
Might be false might not, but I'm trying it tonight before we go to bed.
 
Cause temps in the fridge this morning are 34-36 degree range and again, it's not even that hot outside.
 
So who knows, but it's something to try at least.
 
I'll also be getting materials at Lowes this next week to make some baffles for inside and move some computer fans around inside to increase general air flow.
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Direct Link To This Post Posted: 04 May 2012 at 1:59pm
Bill, I have the same problem with a fridge in my garage.  I have to adjust it every winter and summer otherwise it will thaw or freeze...
 
Fridge baffle:  Open the top and bottom vent covers and look at the airspace behind the fridge.  Usually the cooling fins are clustered up against the back of the fridge and there is a bunch of empty air space between them and the wall of the camper.  Warm air rises off of these fins and out of the top vent cover, sucking in cooler air through the lower cover, and the process continues.  If you cut a piece of cardboard to fit into that empty area, roughly half-way between the top and bottom cover, you will force more of that cool air to flow directly over those fins instead of mixing randomly around in the dead air space where it isn't doing any good.
Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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Pawpod View Drop Down
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Direct Link To This Post Posted: 04 May 2012 at 6:51pm
We just bought a small refridarator fan that circulates the air inside. Runs off a c cell battery which lasted the season. Actually had to turn the fridge down as it was a bit too cold
Ready to pod around!
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kymooses View Drop Down
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Direct Link To This Post Posted: 07 May 2012 at 3:48pm
Over our weekend trip we maintained pretty decent temps in the fridge.
 
It's weird though it still heats up in the evenings for some weird reason.  Wink  Not to any noticeable or disagreeable temp though.
 
We lined our fridge door this time with frozen water bottles and today when we got home some of them were still pretty icy.  That was a great way to help with the internal temps most the 3 days we were camping.  Even turned the temp down to lower settings at times.
 
Also I think I found the thermistor on the internal fins, hadn't noticed it before on our old fridge but I will be moving that up and down throughout the season to help adjust our temps and keep them steady during the season.
 
Probably will still end up doing a bit of baffling and attaching a stand alone 12v fan to the back cooling fins just for my own peace of mind.
 
Big change from the fridge we had in there last season though.  Glad we had the old one replaced!
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