Lp Gas At High Altitude Elevations - Rheem RGFE Installation Instructions Manual

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 orifices 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.
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
Altitude burner) 15000
0 to 2000 ft. 15000
2001 to 3000 13200
3001 to 4000 12600
4001 to 5000 12000
5001 to 6000 11400
6001 to 7000 1080
7001 to 8000 10200
8001 to 9000 9600
9001 to 10000 9000
Orifice Ordering Information
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
Orifice
Size
1.15 mm (factory)
1.15 mm
1.10 mm
#58
#59
#60
#62
#63
#64
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