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Capacity
Gas
Natural
All Sizes
LP / Propane
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
All
* Conversion requires installation of a gas valve regulator spring, which is provided with the gas conversion kit.
† LP kits include low line pressure switch.
Capacity
045
070
090
110
Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-
1370 m).
507769-05G / 31-5000656
Manifold and Supply Line Pressure 0-10,000 ft.
Manifold Pressure in. w.g.
0-4500 ft.
4501-5500 ft. 5501-6500 ft. 6501-7500 ft.
3.5
3.3
10.0
9.4
0 - 7,500 ft
(0 - 2,286 m)
Natural to LP/Propane
11K50†
Table 18. Burner Orifice Conversion Kits at Varying Altitudes
0 - 4500 ft
(0 - 1,373m)
No Change
No Change
No Change
No Change
Table 19. Pressure Switch Requirements at Varying Altitudes
3.2
3.1
9.1
8.9
Table 17.
High Altitude Natural Burner
Orifice Kit
51W01
4501 - 7500 ft
(1371 - 2286m)
11U66
11U70
11U70
11U70
Issue 2223
Supply Line Pressure
7501-10000
0-10,000 ft.
ft.
3.5
4.5
10.0
11.0
7,501 - 10,000 ft
(2,286 - 3048m)
High Altitude LP/Propane
Burner Orifice Kit
11K45†
7501 - 10000 ft
(2286 - 3048m)
11U69
11U68
11U64
11U64
in. w.g.
13.0
13.0
Page 43 of 55
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