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Gas Requirements
70304601
34
High Altitude Burner Orifice Sizing
For proper operation at altitudes above 2000 feet
(610 meters), the gas burner orifice size must be
reduced to ensure complete combustion. Refer to
Table 7.
For CE models, consult local gas supplier.
Model Gas
Altitude Burner Orifice New Rate
Feet Meters No. Inches mm Quantity
Part
Number
(Btu/hr.)*
T30
Natural Gas 2001-4000 610-1220 22 0.1570 4.0
2
M402996 134,320
4001-6000 1221-1830 24 0.1520 3.9 M402980 122,640
6001-8000 1831-2440 26 0.1470 3.7 M401000 110,960
8001-10,000 2441-3050 28 0.1405 3.6 M401014 99,280
L.P. Gas 2001-6000 610-1830 42 0.0935 2.4 M403017 134,320
6001-8000 1831-2440 43 0.0890 2.3 M406184 110,960
8001-10,000 2441-3050 44 0.0860 2.2 M401011 99,280
T45
Natural Gas 2001 – 4000 610 – 1220 15 0.1800 4.6
2
M411511 183,000
4001 – 6000 1221 – 1830 17 0.1730 4.4 M411374 168,400
6001 – 8000 1831 – 2440 18 0.1695 4.3 M402988 155,000
8001 – 10000 2441 – 3050 20 0.1610 4.1 M401002 142,600
L.P. Gas 2001 – 4000 610 – 1220 36 0.1065 2.7 M402487 183,000
4001 – 6000 1221 – 1830 37 0.1040 2.6 M411375 168,400
6001 – 8000 1831 – 2440 38 0.1015 2.6 M411376 155,000
8001 – 10000 2441 – 3050 40 0.0980 2.5 M406361 142,600
* Btu/hr. derate of 4% per 1000 feet (305 meters) of altitude.
Tabl e 7