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Gas Requirements
For converting Non-CE Models from Natural Gas to
L.P. Gas:
200 Pound Models - M4975P3
High Altitude Orifice Sizing
For proper operation at altitudes above 2000 feet (610
meters), the gas orifice size must be reduced to ensure
complete combustion. Refer to
Table 4.
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.)*
200L/N
Natural
Gas
2001 – 4000 610 – 1220 19 .1660 4.2
5
M402995 391,000
4001 – 6000 1221 – 1830 20 .1610 4.1 M401002 357,000
6001 – 8000 1831 – 2440 22 .1570 4.0 M402996 323,000
8001 – 10,000 2441 – 3050 24 .1520 3.9 M402980 289,000
L.P.
Gas
2001 – 4000 610 – 1220 33 .1130 2.9
4
M401022 391,000
4001 – 6000 1221 – 1830 34 .1110 2.8 M411512 357,000
6001 – 8000 1831 – 2440 7/64 .1094 2.8 70070902 323,000
8001 – 10,000 2441 – 3050 37 .1040 2.6 M401024 289,000
* Btu/hr. derate of 4% per 1000 ft. (305 m) of altitude.
Table 4