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Old 07-21-2016, 04:36 PM   #57
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Also remember that the 11 Inch spec is with all gas appliances running. Static pressure will be closer to 14 inches.
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Old 07-22-2016, 07:35 AM   #58
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High altitude

Zeema: I had this problem with my water heater. I contacted a local dealer, did not like his "solution", so I contacted the water heater manufacturer. They have a "high altitude orifice" that was not expensive and fairly easy to install. Problem solved.
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Old 07-22-2016, 11:33 AM   #59
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All I can share is my experience. A couple years ago, I was camped right at the entrance to RMNP (around 7800 feet) and the water heater didn't work well. Lazy yellow flame in it as well as the stove. I don't recall issues with the fridge though. I fiddled with the mixture at the water heater tube and got some improvement for that stay. When I got home, I bough the gauge and found the static pressure of my regulator was only a bit over 10" and the dynamic pressure was a hair below 9". After proper adjusting, everything worked better at home ( 600 feet elevation). I haven't had the AS at significant elevation since, but the improvement at low elevation tells me that more was off than just mixture at the H2O heater orifice.
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Old 07-22-2016, 04:17 PM   #60
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We live on the front range and camp in RMNP often. Have never had any issues with our appliances running on gas (fridge, water heater, range/stove top or furnace).
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Old 07-22-2016, 04:31 PM   #61
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Originally Posted by wulfraat View Post
We live on the front range and camp in RMNP often. Have never had any issues with our appliances running on gas (fridge, water heater, range/stove top or furnace).
Well, your regulator must be adjusted correctly AND your mixture settings must be correct. Lucky you!
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Old 07-23-2016, 08:45 AM   #62
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Another example of the ever expanding tool box contents necessary to keep the Airstream running.....

Tools...More Tools....Yeah
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Old 07-23-2016, 10:15 AM   #63
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A guy can never have too many tools
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Old 10-11-2016, 08:36 PM   #64
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not sure i understand the higher pressure for higher altitudes. seem to me with less air you would need less gas?

but then i see someone was having a problem with reefer not running or running poorly, and having low pressure at regulator when check..

seem like more gas would create a overrich burn with a lot of sooting.

confused ..
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Old 10-12-2016, 11:51 AM   #65
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I have not measured static or dynamic propane pressure downstream of my regulator in the Airstream. I've had some trouble getting my new Dometic 2510 fridge to ignite on gas.

At 8300 feet we have about 25% less air and a corresponding drop in air pressure. Packaging that includes air tends to expand once we haul it up here, for example chip snack bags. I installed a heater in my shop and it came with the "high altitude" kit including orifices to accommodate the atmospheric conditions here. I had trouble with my house "tankless" water heater sooting up. We discovered it was not set correctly for high altitudes when installed and thus burning rich.

I agree with carl2591 that less air may result in too rich settings. And that may result in poor ignition, like a flooded engine. Increasing propane delivery pressure seems counter intuitive to me. But people do it and it seems to resolve the problem. Besides, I wouldn't mind purchasing a manometer.

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Old 10-19-2016, 08:24 PM   #66
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http://www.rheem.com/docs/FetchDocum...7-ac5a6b665761

in this pdf by Rheem water heater corp show the orifice size increases when the altitude increases.. for example the chart show orifice size at sea level as a #10 and at 10,000 ft it decreases to a #19. (orifice size is smaller the larger the orifice number, weird.

So what this says is you should decrease the pressure vs increase it. guess i will have to wait till I get up there to find out.
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Old 10-19-2016, 09:06 PM   #67
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Thanks for your research Carl. It makes good sense to me. Less air, less fuel wanted. Gotta have the mixture right.

That said, maybe like high altitude aircraft with turbos or superchargers, is more gas pressure needed to maintain the same burner BTU rate with the smaller orifice?

David
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Old 10-19-2016, 09:55 PM   #68
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Originally Posted by dbj216 View Post
Thanks for your research Carl. It makes good sense to me. Less air, less fuel wanted. Gotta have the mixture right.

That said, maybe like high altitude aircraft with turbos or superchargers, is more gas pressure needed to maintain the same burner BTU rate with the smaller orifice?

David
Exactly. The mixture is controlled, not by the pressure as much as by the sliding "vent" surrounding the orifice. If the pressure is low, you won't be able to get the mixture exactly right with the slider to get the nice hard blue flame.
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