Forum Discussion
C_Schomer
Jun 25, 2015Explorer
This might or might not help... The laws may have changed but when I got certified in 78 in Denver, gas appliances could have the S.L. btu input up to 2000' but the input had to be derated 4%/1000' as soon as they went above 2000'. BBQ grills, gas driers and anything with over sized heat exchangers were exempt from that rule but I have no idea about RV fridges. The correct way to derate is with a smaller orifice but the pressure stays the same cuz the pressure is critical to get the correct air/fuel ratio. Decreasing the orifice pressure will cut down the input but there's no guarantee the mixture can be adjusted correctly with the primary air shutter. Craig
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