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Table 16 or Table 17 list required pressure switch changes and orifice conversion kits at varying altitudes.
The combustion air pressure switches are factory set and require no adjustment.
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
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).
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-
1371 m).
507768-05G / 31-5000655
Manifold and Supply Line Pressure 0-10,000 ft.
Manifold Pressure in. w.g.
0-4500 ft.
4501-5500 ft.
3.5
3.3
10.0
9.4
0-7,500 ft
(0-2,286m)
Natural to LP/Propane
11K50+
Table 16. Burner Orifice Conversion Kits at Varying Altitudes
0 - 4500 ft
(0 - 1,371m)
No Change
No Change
No Change
No Change
Table 17. Pressure Switch Requirements at Varying Altitudes
5501-6500 ft.
6501-7500 ft.
3.2
3.1
9.1
8.9
Table 15.
High Altitude Natural Burner
Orifice Kit
51W01
4501 - 7500 ft
(1371 - 2286m)
11U66
11U70
11U70
11U70
Issue 2223
Supply Line Pressure
0-10,000 ft.
7501-10000 ft.
3.5
4.5
10.0
11.0
7,501 - 10,000 ft
(2,286 - 3,048 m)
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 47 of 56
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