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Old 07-10-2018, 03:22 PM   #1
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Default Burping Update

In reference to older thread re poor cooling Dometic 2310 3-way. Ok I pulled the fridge. Pretty easy really (only a 3cf so it's small). Spent a few days with it in the garage burping. Also cleaned coils, etc. with air and water. Disconnected 110v heating element and did a resistance test (passed) and connected the heating element directly to AC bypassing the thermostat (Dometic recommendation). Two days later it's only gotten down to 40 deg. and I'm wondering what's acceptable given the conditions. Those conditions are a garage where during those 2 days the temp ranged from the mid 90s (at night) to over 110 (in day....hey it's Phoenix). Should I expect it to get down into the 30s? Or is that unrealistic? I'm planning on giving it another day before I jump into any buy/repair mode. Ideas? Opinions? ......all welcome! Thanks.
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Old 07-10-2018, 03:28 PM   #2
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Default Adding....

I meant to add that I've been monitoring the temps of the coils and boiler area with an IR gun. They appear to be relatively consistent from one to the other area....but....some times the overall temps appear to be higher than others. For example, readings might be c.116 on coils/boiler and, say, 8 hours later only 104 deg. Can't figure that one out. There is no thermostat controlling anything....the 2 wires of the heating unit go directly to AC power and nowhere else. Hmm.
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Old 07-10-2018, 03:52 PM   #3
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Perhaps the ARP website could give you more info.

https://www.arprv.com/

The first line on their website says boiler temp should be around 350F.

I doubt you are measuring boiler temp as you can't get to it, certainly not with an IR gun as you cannot see it. The temp you quote is correct for the bottom of the coils.

I find the website difficult to get the information one wants but it is all there, just have to browse around and read things about 20 times.

You should see freezer temps below 30F but probably around 50F for the box. I live in Phoenix (Tempe) but won't be back to help you out till October. It is hot there as you have noticed!
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Old 07-10-2018, 04:33 PM   #4
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What is the freezer temp? Should be in 0 - 10 degree range.

Also, try blowing air across the rear coils, especially the upper condenser coil.

The ARPRV site is very good. I use one of their fans mounted on the exhaust vent to suck air up through the coils. I also have their controller to run the fans and protect the fridge.

I also did some vent mods to match the Dometic installation guidelines, which Roadtrek did not follow on my 2006 210P.

All of this has the fridge working OK, not great, but acceptable. I can achieve 39-41 degrees in hot weather (90's). I try to only put room temperature items in at night.

When this fridge fails I will likely put in a compressor fridge, though I will need a battery system upgrade also.
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Old 07-10-2018, 04:55 PM   #5
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Default Harry

Right: the IR gun only measures the outside of the insulation pack around the boiler. I was following a Dometic tech guide that said to start the fridge and hand check the coil and insulation pack temps after 2 hours. If one was hot and the other cold it indicated a particular type of problem. Temps on the pipe coming out of the top of the insulation pack are more in the 200-250 range.
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Old 07-10-2018, 04:57 PM   #6
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Default peteco

When I check temp at noon I'll put the thermo in the freezer, wait an hour and see what it reads. Not quite as hot today but very muggy. Monsoon rain last night so we're only expecting a muggy 102 today.
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Old 07-10-2018, 06:41 PM   #7
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Under the conditions you reported in the garage, I would think 40 degrees would be fine. Like mentioned, it will be interesting to see the temp in the freezer under the same conditions. Like Peteco suggested, put a fan to blow upwards on the coils and see if that changes anything in 24 hours.

Personally, just me, I would be happy as a pig in slop if the refrig showed 40F under the garage conditions you indicated, assuming the freezer was reading acceptable.

Do you have anything in the refrig or is it just trying to cool the air in there? I would put one of these in there and a half dozen cold cokes or beers out of the household refrig and check the temps in a day.
https://www.campingworld.com/fridgec...-on-off-switch

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Old 07-11-2018, 02:40 AM   #8
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Default peteco and doneworking

Fridge held right at 40 today. I did put the thermo in the freezer and waited a few hours. It read 0....actually -1. I'm trying done's sixpack in the fridge and the internal fan (I have one). Will check tomorrow morning. Thanks for your advice.
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Old 07-11-2018, 11:20 AM   #9
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Quote:
Originally Posted by GallenH View Post
Fridge held right at 40 today. I did put the thermo in the freezer and waited a few hours. It read 0....actually -1. I'm trying done's sixpack in the fridge and the internal fan (I have one). Will check tomorrow morning. Thanks for your advice.
Hi GallenH,

I got to wondering what would happen if I actually got my absorption refer out of my B and into the garage. Well, until I read your last post. I would enjoy the sixpack looking at the refer, and then I would reach for my 12 Gage while clicking 'place order' for the new compressor refer.

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Old 07-11-2018, 11:58 AM   #10
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Our garage in the greater Houston area routinely reaches the mid-90s in temperature. Both of our Dometic 2351s maintain temps in the 30s under those conditions. Depending on the weather, it can remain in the mid-90s for days or weeks at a time.

I'm guessing you are the OP from that other recent thread which talked about burping (I didn't verify). If not, then my two sentences above would make no sense. Recapping for other thread readers, my husband and I struggled with two propane fridges until we gave up and went with a Vitrifrigo. The two surplussed Dometics are getting put together in a wheeled cabinet as an off-grid garage unit (handy in hurricane country).

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