507769C05 Page 43 of 55
Table 17.
Manifold and Supply Line Pressure 0-10,000 ft.
Capacity Gas
Manifold Pressure in. w.g.
Supply Line Pressure
in. w.g.
0-10,000 ft.
0-4500 ft. 4501-5500 ft. 5501-6500 ft. 6501-7500 ft.
7501-10000
ft.
All Sizes
Natural 3.5 3.3 3.2 3.1 3.5 4.5 13.0
LP / Propane 10.0 9.4 9.1 8.9 10.0 11.0 13.0
NOTE: A natural to LP propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation
instruction for the conversion procedure.
Capacity
0 - 7,500 ft
(0 - 2,286 m)
7,501 - 10,000 ft
(2,286 - 3048m)
Natural to LP/Propane
High Altitude Natural Burner
Orice Kit
High Altitude LP/Propane
Burner Orice Kit
All 11K49 73W37 11K44
Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-
1370 m).
Table 18. Burner Orice Conversion Kits at Varying Altitudes
Capacity
0 - 4500 ft
(0 - 1,373m)
4501 - 7500 ft
(1371 - 2286m)
7501 - 10000 ft
(2286 - 3048m)
045 No Change 11U65 11U66
070 No Change 11U70 11U68
090 No Change 11U71 11U68
110 No Change 11U70 11U68
Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-
1370 m).
Table 19. Pressure Switch Requirements at Varying Altitudes
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