Conversion; Natural Gas High Altitude Conversion; Lp/Propane Gas Sea Level And High Altitude Conversion - Nordyne TA-060C-08A Installation Instructions Manual

For a Natural Gas Sea Level Heating Value of 800 to 899 Btu/cu.ft.
Manifold Pressure Setting (in WC) Full Input
For a Natural Gas Sea Level Heating Value of 900 to 999 Btu/cu.ft.
Manifold Pressure Setting (in WC) Full Input
For a Natural Gas Sea Level Heating Value of 1,000 to 1,100 Btu/cu.ft.
Manifold Pressure Setting (in WC) Full Input
Table 6. Manifold Pressure (in WC) for Natural Gas at Various Altitudes
Manifold Pressure Setting (in WC) Full Input
Table 7. Manifold Pressure (in WC) for LP/Propane Gas at Various Altitudes
Furnace Rating
Plate Input (Btu/h)
60,000
72,000
96,000
120,000
Table 8. Natural and LP Gas Orifice Sizes
for Elevations between zero and 4999 ft.
Above Sea Level
gas. The gas heating value based on sea level
can be obtained from your local gas utility. The
heating value of gas at high altitude is always
lower than the sea level heating value. The
heating values used in Tables 6 & 7 are based
on sea level values.

Natural Gas High Altitude Conversion

All factory shipped furnaces are ready to oper-
ate between zero and 4999 ft. above sea level.
For higher altitudes (between 5000 and 10,000
ft. above sea level), conversion can be achieved
simply by adjusting the furnace manifold pres-
sure as shown in Table 6.
zero to
Low Input
zero to
Low Input
zero to
Low Input
For a LP Gas Sea Level Heating Value of 2,500 Btu/hr.
zero to
1999
Low Input
Orifice Drill Size
Nat LP
45 55
43 54
43 54
43 54
Elevation (feet above sea level)
2000 to 5000 to
1999 4999 5999
3.5 3.5 3.5
1.7 1.7 1.7
Elevation (feet above sea level)
2000 to 5000 to
1999 4999 5999
3.5 3.5 3.5
1.7 1.7 1.7
Elevation (feet above sea level)
2000 to 5000 to
1999 4999 5999
3.5 3.5 3
1.7 1.7 1.5
Elevation (feet above sea level)
2000 to 5000 to 6000 to
4999 5999
10 8.5 10
5.5 5.5 6.5
Furnace Rating
Plate Input (Btu/h)
60,000
72,000
96,000
120,000
Table 9. Natural and LP gas Orifice Sizes
for Elevations between 5000 and 10,000
ft. Above Sea Level
LP/Propane Gas Conversion
IMPORTANT NOTE: When converting a low
NOx furnace from Natural gas to LP/pro-
pane gas, it is necessary to remove the NOx
Baffles from the furnace.
Conversion of this furnace to utilize LP/propane
gas must be made by qualified service person-
nel, using factory authorized or approved parts.
Conversion to LP/propane gas can be accom-
plished by first replacing the natural gas orifices
with the appropriate LP/propane orifices shown
in Table 8 or 9. Note: for installations between
6000 to 8000 to
7999 10000
3.5 3.0
1.7 1.6
6000 to 8000 to
7999 10000
3.2 2.8
1.6 1.5
6000 to 8000 to
7999 10000
2.8 2.5
1.4 1.3
8000 to
7999 10000
9 8.5
6.5 6.5
Orifice Drill Size
Nat LP
45 56
43 55
43 55
43 55
25