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Gas Requirements
35
70420801 (EN)
High Altitude Orifice Sizing

For proper operation at altitudes above 2000 feet (610

meters), the gas orifice size must be re duced to ensure

complete combustion. Refer to Table 8.

For CE models, consult local gas supplier.

Non-CE Models
Model Gas Altitude Orifice New
Rate
feet m No. inches mm Quantity Part No. (Btu/hr.)*
120L/N
Natural
Gas
2001 – 4000 610 – 1220 16 0.1770 4.5
3
M402988 248,400
4001 – 6000 1221 – 1830 18 0.1695 4.3 M402995 226,800
6001 – 8000 1831 – 2440 19 0.1660 4.2 M401002 205,200
8001 – 10,000 2441 – 3050 20 0.1610 4.1 M401020 183,600
L.P.
Gas
2001 – 4000 610 – 1220 38 0.1015 2.6 M411376 248,400
4001 – 6000 1221 – 1830 39 0.0995 2.5 M401007 226,800
6001 – 8000 1831 – 2440 41 0.0960 2.4 M401015 205,200
8001 – 10,000 2441 – 3050 42 0.0935 2.4 M403017 183,600
170L/N
Natural
Gas
2001 – 4000 610 – 1220 14 0.1820 4.6
4
M411371 363,400
4001 – 6000 1221 – 1830 16 0.1770 4.5 M411373 331,800
6001 – 8000 1831 – 2440 17 0.1730 4.4 M411374 300,200
8001 – 10,000 2441 – 3050 19 0.1660 4.2 M402995 268,600
L.P.
Gas
2001 – 6000 610 – 1830 30 0.1285 3.3 3M401021 363,400
6001 – 10,000 1831 – 3050 31 0.1200 3.0 M401017 300,200
* Btu/ hr. derate of 4% per 1000 ft. (305 m) of altitude.
Table 8