Frig and heater jet size question for better cooling of frig and heating of water. - Fiberglass RV


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Old 02-27-2014, 09:57 AM   #1
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Frig and heater jet size question for better cooling of frig and heating of water.

Both the frig. and water heater have jets.

If I increase the jet size by 1 number (#43 to #44) on my frig will that help in making it cool faster?

If I increase the jet size by 1 number on my water heater will that help in making it heat faster?

Just an idea I have about getting better cooling and heating from both.
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Old 02-27-2014, 10:48 AM   #2
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Hmmm... I am normally not a net nanny, but the size of the jet on your funace is determined by people that know a lot more about it then anyone here. A larger jet will allow more gas, but if your water heater will even benefit, or if you just have flames coming out of the exhaust, hard to say.

The fridge, even less likely. What the flame is doing is distilling water out of ammonia. This is necessary to cool, but more heat may just cause water to carry over where it should not be. This would make the fridge less cold.
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Old 02-27-2014, 10:56 AM   #3
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Gas fridges seam to be a source of camper fires.
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Old 02-27-2014, 11:50 AM   #4
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David Tilston
I don't have a furnace.
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Old 02-27-2014, 12:08 PM   #5
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Originally Posted by Darwin Maring View Post
Gas fridges seam to be a source of camper fires.

Hmmmm... I can't see why????

One would think that the other gas appliances are a greater threat. I know of at least three motorhomes that burned down due to fires that started on the stove, but none from the refrigerator.

In as much as it has only a very small pilot size flame, that is fully enclosed, and a no-flame detector, I would think that it's the safest of RV appliances.
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Old 02-27-2014, 12:36 PM   #6
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Sorry, I meant to type water heater. Same answer. May heat the water quicker, may send flames out the exhaust port. I really don't have much expertise with combustion engineering. I probably should not have commented.
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Old 02-27-2014, 12:46 PM   #7
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I am an engineer, but not a combustion engineer. I have, however, messed with this stuff on a small, portable BBQ that I rebuilt. Here's what I learned.

1.The gas piping either side of the orifice needs to be clean, as well as the small orifice plate itself. This is the source of most problems.

2. I did drill out the BBQ orifice by one size only. Yes, I get more heat, but I cannot leave the lid closed on the BBQ since the flame goes out very quickly.

So my recommendation is to leave well enough alone, and make sure your piping is clean, along with the orifice itself. you can get brushes to clean that small hole.

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Old 02-27-2014, 12:46 PM   #8
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Your refrigerator uses a low volume orfice, sized for your unit.
If your at altitudes above 8000 ft., you may need to change it.
Too a smaller one.
If you want your refrigerator to operate efficiently, clean your burner assembly and check your fuel pressure.
I've never had a need for hot water quicker than the 10 minutes it takes for my 6 gallon heater to get hot. I guess one could install a instant water heater.
I just leave my water heater and refrigerator lit when I travel.
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Old 02-27-2014, 02:10 PM   #9
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Kevin is there a reason you need hot water to heat up faster than you are currently getting?
My hot water tank seems to heat up pretty fast - takes only a few minutes to fully heat up the water in the tank - maybe 10-15 min.....
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Old 02-27-2014, 02:20 PM   #10
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I had this problem in a bakery I owned. We ran propane, but the ovens they shipped to me had orifices sized for natural gas. I wondered why the ovens weren't efficient, and why I had to keep cleaning out the soot. Different gasses have different pressures - lp orifice is smaller than natural gas to generate the same BTUs. I did change the orifice so the ovens would work properly, but it was to match the pressures. I wouldn't recommend changing the size of the orifice. I'm an engineer, too, and not a combustion engineer, either, but have some experience.
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Old 02-27-2014, 02:23 PM   #11
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No reason on either, just wanted to know if I could improve the performance on both.
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Old 02-27-2014, 03:51 PM   #12
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Kevin, this is Your Stand-In Mother speaking:

Don't mess with the jet sizes on your gas appliances.

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Old 02-27-2014, 04:07 PM   #13
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Just google camper refrigerator fires.

Running the fridge on propane while you are driving and you pull into a gas station and fill up with a Flame not far from where you or someone else is filling up is dangerous.

Norcold Recall

TO ALL DOMETIC RV FRIDGE OWNERS!!! FIRE!!! PICS!!!! - AR15.Com Archive
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Old 02-27-2014, 04:09 PM   #14
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Add a solar fan to the top of the fridge exhaust vent so you get better cool air movement over the coils.
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