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08-21-2012, 09:25 AM
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#41
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Quote:
Originally Posted by f1100turbo
Who has a pic of the factory mounting of a fan ?
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Don't have a pic to give you, only a verbal desp based on dwg I have. In a Dometic 1350 Two fans are mounted side by side on the back of the refrig assembly using a sheetmetal U- channel attahed to the box. They are simply sheet metal screwed into the channel. They are located just below the finds of the condenser assembly for max flow across the unit. I don't think where yours were mounted would really make a difference in performance. The boiler is insulated and covered in sheetmetal to keep the heat in. If you had 50 cu ft./ miniute flow caused by a top fan or a botom fan, its still the same 50 cu. ft./min with the same temp rises on the air flow. The bottom location justs impedes access to connections and electronics. The only access in my installation is to remove the large 200 lb. box for access. Thiis is why some folks have mounted jut below the outside acccess cover. Mine whine, but no big deal, barely hear them anyway. Dometic web site, Model RM1350 back view assembly drawing.
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08-21-2012, 09:35 AM
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#42
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Quote:
Originally Posted by herk7769
Zero. Solar powered by integrated solar cells.
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Kinda cool, whats the CFM rating of these fan(S)? I know some of these folks are going quite high with flow capacity, maybe into subcooling. Thats why the factory uses thermostatic switches to keep the uptake in a range. If the solar fans worked well, could keep the factory fans only opering ocasionally, like on dark/or hot days.
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08-21-2012, 04:41 PM
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#43
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Quote:
Originally Posted by herk7769
I knew I was "over thinking" this.
I was trying to make it automatic using a feed from the "run" DC line to power a relay to feed an inverted output photocell to power on the solar fans.
First off, the solar fans won't run at night anyway!  (VERY embarrassed.)
Second, the relay will work (there are several cheap ones) but will increase battery drain by the amperage draw of the relay. (only a few milliamps buy I am trying to avoid battery drain at all.
A manual switch solves everything.
NASA invents the "Space Pen" at a cost of a million dollars.
Russia uses pencils. |
Lou,
Forget my question CFM, its looks tiny and it is. Read reviews on numerous sellers and the thing is pretty badly rated. Fails in sun (plastic cracks), moves very little air, provided no help to inside temps, solar panel failed and fan failed etc. Save your 'C' note.
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08-21-2012, 04:46 PM
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#44
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Well I removed my 120mm fans and installed two 80 mm fans in first pic.
The blow up the vent stack and not On the lower coils.
The second pic shows were I go 12v switched power .
When you remove cover it's the lower right terminal.
Dometic model dm2852rbx
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08-21-2012, 06:43 PM
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#45
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Vince,
Thanks for the input. JohnD set a MOSFET controller circuit via PM and with your input to save my money on the "commercial version" I am going to build a solar powered fan set to mount on my existing cap.
A smallish solar panel mounted on my existing rain cap that drives a pair (or 3) of 120mm 12VDC box fans directly under it using a MOSFET controller circuit for on/off control may very well do the trick.
Photos and parts list when I get around to building it this fall.
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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08-21-2012, 06:47 PM
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#46
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by herk7769
Vince,
Thanks for the input. JohnD set a MOSFET controller circuit via PM and with your input to save my money on the "commercial version" I am going to build a solar powered fan set to mount on my existing cap.
A smallish solar panel mounted on my existing rain cap that drives a pair (or 3) of 120mm 12VDC box fans directly under it using a MOSFET controller circuit for on/off control may very well do the trick.
Photos and parts list when I get around to building it this fall.
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You still haven't mounted the gas struts on the doors yet! 
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08-22-2012, 05:12 PM
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#47
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Senior Member
Join Date: Oct 2011
Location: Austin, Tx area
Posts: 126
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Quote:
Originally Posted by f1100turbo
Attachment 18462
Attachment 18463
Well I removed my 120mm fans and installed two 80 mm fans in first pic.
The blow up the vent stack and not On the lower coils.
The second pic shows were I go 12v switched power .
When you remove cover it's the lower right terminal.
Dometic model dm2852rbx
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Good job, good job!!
Let us know how it affects the fridge
performance......
cheers,
johnd
__________________
2001 Cherokee CKT27X - 2005 Chev 3500
Sara, John & Crafty Canines - Coco and Cole
---
Medical research shows that men have a "biological clock" too. The older we get, the greater the NEED to drive a TRUCK!
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08-22-2012, 05:13 PM
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#48
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
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Originally Posted by dnaraG_1M
Good job, good job!!
Let us know how it affects the fridge
performance......
cheers,
johnd
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I'll know first of next week.
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08-22-2012, 06:07 PM
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#49
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Quote:
Originally Posted by dunnnc
You still haven't mounted the gas struts on the doors yet! |
Blah, Blah, Blah...
Jeeze, I am ready to ship them back! 
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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08-22-2012, 06:11 PM
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#50
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by f1100turbo
I'll know first of next week.
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Here is where I mounted mine and it really makes a big difference in how the refrigerator cools. It worked great even when we had temps in the upper 90's and low 100's and the sun on the back of the camper. Will mount a 120mm fan down inside the area under the roof vent cover when it gets here later this week. The upper fan will be just added ventilation. Have dual fans inside the refrigerator hanging on the fins and the temp holds around 33°-35° constant even in the hottest weather we've had.
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08-22-2012, 06:41 PM
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#51
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by herk7769
Blah, Blah, Blah...
Jeeze, I am ready to ship them back! |
Don't want them back, still have 3 gathering more dust laying on a shelf.
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08-22-2012, 06:54 PM
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#52
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Member
Join Date: Dec 2010
Posts: 53
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Mounted a single computer power supply fan on top of the external cooling fins. Amazed at the difference. Cool down was 1/3rd to 1/2 the time. I use a manual switch to control it. Since most of time I'm in parks with power I don't worry about running the fan all the time. Just be careful not to cool the ammonia can at the bottom. It's supposed to be hot. The little battery operated internal fans help to keep everything in the refrigerator at equal temperature.
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08-22-2012, 07:10 PM
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#53
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
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Originally Posted by dunnnc
Here is where I mounted mine and it really makes a big difference in how the refrigerator cools. It worked great even when we had temps in the upper 90's and low 100's and the sun on the back of the camper. Will mount a 120mm fan down inside the area under the roof vent cover when it gets here later this week. The upper fan will be just added ventilation. Have dual fans inside the refrigerator hanging on the fins and the temp holds around 33°-35° constant even in the hottest weather we've had.
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Looks good.
Do u have a filler panel at the top of that access panel?
That filler panel is what I cut the circles in to mount mine
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08-22-2012, 07:17 PM
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#54
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Are you talking about the flat plate to the right?
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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08-22-2012, 07:19 PM
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#55
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by xf021209
...Just be careful not to cool the ammonia can at the bottom. It's supposed to be hot...
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The can at the bottom is the accumulator tank and just stores the liquid ammonia. If the fan is doing it's job, the can should be cool. The ammonia is pulled from the tank and boiled in the stack.
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08-22-2012, 07:34 PM
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#56
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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No the filler panel above the shield.
First pic shows the filler panel with fans cut in .
Second shows a view further back.
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08-22-2012, 07:51 PM
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#57
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Site Team - Lou
Join Date: Oct 2009
Location: South Eastern PA
Posts: 23,269
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Quote:
Originally Posted by f1100turbo
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I need to look at mine tomorrow.
__________________
Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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08-22-2012, 07:54 PM
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#58
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Mod free 5er
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,702
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Quote:
Originally Posted by f1100turbo
Looks good.
Do u have a filler panel at the top of that access panel?
That filler panel is what I cut the circles in to mount mine
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Don't have a filler panel as far as I can see up the cavity. Will know more when I take the roof vent cover off. Will definitely take pictures.
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08-22-2012, 07:56 PM
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#59
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
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Originally Posted by herk7769
I need to look at mine tomorrow.
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I never even seen it before .
Then when I was deciding on whether to mount fans in upper end of vent stack via taking of the top vent cover I seen this filler panel.
When I removed it (two screws) I could see all the way up to the top vent cover.
So what better place to mount fans.
If it doesn't work out I'll make a new filler panel.
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08-22-2012, 07:58 PM
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#60
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
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Originally Posted by dunnnc
Don't have a filler panel as far as I can see up the cavity. Will know more when I take the roof vent cover off. Will definitely take pictures.
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Mine is obviously obtained from bottom.
I'll need to get better lighting to take a few better pics.
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