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Page 11 of 16
15-February-2012
92-42810-GLDH
90% GAS FURNACE - ORIFICE SELECTION CHART - NATURAL GAS
CAUTION: Selection of the correct Natural Gas Orifice requires the following information for the specific installation:
1) Altitude in of the installation (ft.).
2) Average energy content of the Natural Gas fuel from the local supplier (BTU/cu. ft.).
For detailed information and instructions for Orifice selection, see the Gas Furnace LP Conversion Kit Index 92-21519-59 and the latest edition of the
National Fuel Gas Code Handbook, or the National Standard of Canada, Natural Gas and Propane Installation Code, CAN B149.1.
CAUTION:This information is provided for replacement purposes only. Conversion for operation at High Altitude must be done using the kit specified
on the product specification sheet for the unit.
NOTE: This Orifice sizing chart is based on 15,000 BTU/HR per burner.
NOTE: Factory installed orifices are calculated and sized based on a Natural Gas heating value of 1075 BTU/cu. ft. and an elevation of 0 - 2000 ft.
Elevation (ft.)
EnergyValue
(BTU/cu. ft.)
0 - 1999 2000 - 2999 3000 - 3999 4000 - 4999 5000 - 5999 6000 - 6999 7000 - 7999 8000 - 8999
850 62-22175-47 62-22175-48 62-22175-48 62-22175-49 62-22175-49 62-22175-49 62-22175-50 62-22175-50
900 62-22175-48 62-22175-49 62-22175-49 62-22175-49 62-22175-50 62-22175-50 62-22175-50 62-22175-51
975 62-22175-49 62-22175-50 62-22175-50 62-22175-50 62-22175-51 62-22175-51 62-22175-51 62-22175-52
1075 62-22175-50 62-22175-51 62-22175-51 62-22175-51 62-22175-51 62-22175-52 62-22175-52 62-22175-52
1170 62-22175-51 62-22175-51 62-22175-52 62-22175-52 62-22175-52 62-22175-53 62-22175-53 62-22175-53
90% GAS FURNACE - ORIFICE SELECTION CHART - LP
CAUTION: Selection of the correct LP Orifice requires the altitude of the specific installation (ft.).
For detailed information and instructions for Orifice selection, see the Gas Furnace LP Conversion Kit Index 92-21519-59 and the latest edition of the
National Fuel Gas Code Handbook (NFG), or the National Standard of Canada, Natural Gas and Propane Installation Code, CAN B149.1.
CAUTION:This information is provided for replacement purposes only. Conversion to LP or for operation at High Altitude should be done using the
kit(s) specified on the product specification sheet for the unit.
NOTE: This Orifice sizing chart is based on 15,000 BTU/HR per burner. Also, the chart is developed using the specified pressure setting of 10 in. water column
instead of the 11.0 in water column used by the NFG and CANB149.1.
NOTE: Orifices supplied in the LP Conversion Kit are calculated and sized based on an altitude of 0 - 2000 ft.
Elevation (ft.) Orifice
0 to 2000 ft. 62-22175-91
2001 to 3000 62-22175-91
3001 to 4000 62-22175-90
4001 to 5000 62-22175-58
5001 to 6000 62-22175-59
6001 to 7000 62-22175-60
7001 to 8000 62-22175-62
8001 to 9000 62-22175-63
9001 to 1000 62-22175-64