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Posted by HeatPro on November 12, 2008 at 11:01:39:
In Reply to: Re: Lochinvar Knight posted by KEN on November 12, 2008 at 08:59:19:
At higher altitudes over 2000 feet, there is less oxygen available for combustion, so the input of gas is made less to match the air flow. The difficulty is getting the air/gas ratio right during setup. Often, manufacturers will make the heater to be used at higher altitudes, a good match is required. You have to pick a particular brand and model to talk to the factory engineers to know ahead of time, it is often too much for an installer to know.
A furnace has similar problems to people at altitude, not enough oxygen.
http://hvac-talk.com/vbb/showthread.php?t=75461
In effect, you buy a furnace that actually puts out 10% or less heat than the nameplate says. People on the mountains above Denver, like Breckenridge, usually know these requirements after installing for some years.
"What about the altitude? Some High alpine tips:
One medical definition of what constitutes high altitude says it starts at 8,000 ft. At that altitude the amount of Oxygen in the air is less than 0.75 of the amount at sea level. Breckenridge has a base elevation is 9,600 feet, with a summit elevation of 12,998 feet above sea level. For that reason you can expect to be winded, especially when walking
http://www.olympus.net/personal/dwren/ski-now4.htm
"