53
LP GAS AT HIGH ALTITUDE
ELEVATIONS
LP Gas is a manufactured gas that has
consistent heating value across most
regions.
The National Fuel Gas Code (N.F.G.C.)
guidelines are used with the following
exception:
The recommended LP Gas high altitude
orifice selections differ slightly in that
the NFGC LP orifice chart, as they are
not accurate for the RGFE, RGGE or
RGJF gas furnaces. The National Fuel
Gas Code LP or
ifices are based on an
11” of water column pressure at the ori-
fice, which differs from products that
use 10” of water column at the orifice.
This difference requires a deviation
from the NFGC orifice size recommen-
dations. The Sea Level input should still
be reduced by 4% per thousand ft. and
the orifice size must be selected based
on the reduced input selection shown in
Table 12.
Orifice Ordering Informa
tion
Orifice sizes are selected by adding
the 2-digit drill size required in the ori-
fice part number. Drill sizes available
are 39 through 64; metric sizes avail-
able 1.10mm (-90) and 1.15mm (-91):
Orifice Part Number 62-22175-(drill
size)
Example 1:
#60 drill size orifice required
Part #62-22175-60
Example 2:
1.15mm drill size orifice required
Part #62-22175-91
TABLE 12
LP Gas Orifice Drill Size and per burner de-rate by elevation based
on 15,000 btu 90+ burners.
IMPORTANT: For 90+ Furnaces only. Do not use this chart for any
80+ Furnace.
Input (per Orifice
Altitude burner) 15000 Size
0 to 2000 ft. 15000 1.15 mm (factory)
2001ⴕ to 3000ⴕ 13200 1.15 mm
3001ⴕ to 4000ⴕ 12600 1.10 mm
4001ⴕ to 5000ⴕ 12000 #58
5001ⴕ to 6000ⴕ 11400 #59
6001ⴕ to 7000ⴕ 1080 #60
7001ⴕ to 8000ⴕ 10200 #62
8001ⴕ to 9000ⴕ 9600 #63
9001ⴕ to 10000ⴕ 9000 #64
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