Refrigerator cooling fans

[Henry Jay Hannigan]

I've been in Vegas all summer..ave temp over 103 every day...dometic
fridge worked fine..NO fan..more than 3inches behind coils in my
bird.....
Regards,
Hank
90SP36



--- In WanderlodgeForum@yahoogroups.com, "Kurt Horvath"
wrote:
>
> Me to Gregg,I cut and pasted this from my post 33990
>
> Photos of Exhaust Vent Fans are in my album , (bumpersbird) bottom
of
> page two and top of page three.
>
> The goal is to move air past the cooling coil mounted on the rear of
> the fridge, in my case a Dometic RM 7030. I have an angled setup
> with an enormous space behind the refer. It is recommended that
> there be no more than 1" a space behind the fridge to facilitate
> convection for cooling the coils. Well I'm not one to reinvent the
> wheel so I wasn't going to pull out the fridge to build a baffle
> system, the recommended fix.
>
> This won't be so much of a problem for you if your fridge is
> 1" or less from the wall behind it. The origonal fan and snap
> thermostat set up should work good if it's all there and working.
>
> To move a sufficient amount of air past the coils. You have two
> choices you can suck or blow. Blowing is not recommended, but it
> works.
>
> Greg's system is set up this way and after a little tweeking it
> works fine.
>
> So how do you suck enough air volume past the coils to make a
> difference? I not an engineer so I went for POWER!
>
> You know the old saying. Put enough thrust behind anything and it
> will fly.
>
> I mounted 5 - 130 CFM computer fans inside the flue vent on the
> roof.
>
>
http://autos.ph.groups.yahoo.com/group/W...tos/view/7
> 006?b=29
>
> I got a marine style switch with a four switch/breaker combo. I
> chose waterproof because I mounted it on the cabinet near the sink
in
> the bathroom and because its high quality and most of all because it
> looks cool.
>
>
http://autos.ph.groups.yahoo.com/group/W...tos/view/7
> 006?b=32
>
> I tagged into the 12V power leading into the fridge.
>
>
http://autos.ph.groups.yahoo.com/group/W...tos/view/7
> 006?b=30
>
> Not a big draw for the fans and the fridge doesn't draw anywhere
> near the 20 amps supplied to it. I used 2 of the 4 switches leaving
> 2 for future use. I wired the switches, #1 runs 2 fans, #2 runs 3
> fans so I have the capability to run 2 fans @ 260 cfm, 3 fans@ 390
> cfm or 5 fans@ 650 cfm.
>
> Yes if you're standing near the access hatch you know its working.
On
> a calm day it will suck in cigar smoke in from 12" to 14" away.
>
> I also mounted 4 fans in the fridge that blow air across the cooling
> fins inside the fridge and of course they circulate the internal
air.
>
>
http://autos.ph.groups.yahoo.com/group/W...tos/view/7
> 006?b=33
>
> They are powered from the internal light assembly and mounted in
> pairs they are quite nice. I got them from a guy on e-bay. Once you
> see these little jewels you'll want them to. I check e-bay for this
> guy and he's not making any fans at this time
>
> The only problem I had was getting the wiring up to the fans. I used
> a piece of pvc pipe I don't remember the size I just grabbed some
> pipe that was laying around the barn and some mounting clamps,
> inserting the require wires into the conduit before mounting the
> conduit to the wood walls.
>
>
http://autos.ph.groups.yahoo.com/group/W...tos/view/7
> 006?b=31
>
> I poked a hole up through the protective
> screen in the flue vent, keeping it smaller than the diameter of the
> pipe so it has a good grip on it. I had to drill one hole through
the
> wall to run the wires into the bathroom. A glob of silicon sealed
the
> hole and holds things firmly to prevent chaffing. I also used wire
> loom where possible. Problem solved.
>
> So far so good, this summer will tell if its working as well as I
> think it will. I have already had to set the thermostat up to keep
> everything on the lower shelves from freezing.
>
> Is it noisy? Yes
> Is it bothersome? Somewhat
> Choice between noise and cold beer? Only you can answer that.
>
> The fans are the big computer fans 4.7" @130cfm. There are fans of
> this size that have a lower cfm and are much quieter to operate. I
> have used these same fans to replace the blowers on some of my
> heaters and they are quiet compared to the fridge set up. The only
> thing I can think of is the fridge cabinet is hollow it may amplify
> the noise.
>
> This post is a little long and may not help a lot in your
> application, but if you have a big space behind the fridge this will
> work.
>
> Kurt Horvath
> 95 PT-42 WLWB
>
>
>
>
>
>
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Gregory OConnor"
> wrote:
> >
> > I dont think the advantage is cool air over the coil as much as
it
> > is removing hot air from the compartment. heat is a necessary
part
> > of Einstines amonia evaporation process and it is important to
> > maintain a gradual cooling. I put a fan ducted to blow in the
> > compartmet but others (I think Ryan or Scott) have a fan at the
> > exhaust which would also remove the chance that blowing in will
> > pressurizing the compartment and push un burned lpg into the bus.
> >
> > GregoryO'Connor
> > 94ptRomolandCa
> >
> > --- In WanderlodgeForum@yahoogroups.com, "Chet Geist"
> > wrote:
> > >
> > > Thanks to all for the advise. I did jump the snap thermal
switch
> > on one of
> > > the fans and it runs fine. The refrigerator seemed to cool a
> > little better
> > > this afternoon, but that was just a short test with only 95
degree
> > > temperature outside. I will probably bypass the thermal on the
> > other fan
> > > soon and see if that is a good solution. I will also pull one
of
> > the
> > > thermal switches and see if I can get a number or something off
> of
> > it and
> > > then buy two new ones.
> > >
> > > Have been packing today to go to the Texas coast on Thursday
and
> > wouldn't
> > > you know it here comes Ike. May have to change plans again.
> > Dolly screwed
> > > up the last trip.
> > >
> > > Chet Geist
> > > 1981 FC33, Austin, Texas
> > >
> > >
> > > -----Original Message-----
> > > From: WanderlodgeForum@yahoogroups.com
> > > [mailto:WanderlodgeForum@yahoogroups.com]On Behalf Of joepat50
> > > Sent: Monday, September 08, 2008 7:35 PM
> > > To: WanderlodgeForum@yahoogroups.com
> > > Subject: [WanderlodgeForum] Re: Refrigerator cooling fans
> > >
> > >
> > > You could try jumping them out and see if the fans start. If
> not
> > the
> > > fan may be NG.
> > > If the switch is bad I got a dozen off ebay for a fan to cool
> the
> > > charger compartment where Im putting an inverter. Supposed to
> > close
> > > at 45 dC or about 115dF. If you want one let me know and I'll
> > send
> > > one out...
> > >
> > > /Joe
> > >
> > > --- In WanderlodgeForum@yahoogroups.com, "chetgeist"
> > wrote:
> > > >
> > > > Behind my refrigerator are two small 12 volt fans that have
> 12
> > volts
> > > > to them. They are equipped with a small button thermal
> switch.
> > I am
> > > > assuming these fans should come on when the temperature
> behind
> > the
> > > > refrigerator gets above a certain temperature. Mine never
> seem
> > to run
> > > > even when it is 100 degrees outside and the sum is shining
on
> > that
> > > > side of the coach. Does anyone know the reason why they do
> not
> > run?
> > > > Does anyone know at what temperature these button thermal
> > switches
> > > > kick in? Yes I have the switch in the galley set to "on".
> > > >
> > > > Chet Geist
> > > > 1981 FC33, Austin, Texas
> > > >
> > >
> >
>