BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS

•Boilers (with exception of 90-75 propane (LP) product) are factory equipped for operation at altitudes ranging from 0-10,000 feet above sea level.

•No changes to factory settings are required for installa- tions from 0-5,000 feet above sea level.

•For altitudes from 5,000-10,000 feet above sea level gas manifold pressure needs to be adjusted based upon calorific (Btu) value of supply gas (contact local gas utility or distributor for this value).

•For specific settings refer to Table 2 for natural gas applications and Table 3, Page 7 for propane (LP) gas applications.

•Instructions on how to adjust gas manifold pressure settings see Figure 27 and Figure 28, Page 44.

Note 90-75 propane (LP) applications for 5,000 - 10,000 feet above sea level require orifice change as well as gas manifold pressure adjustment based upon calorific (Btu) value of supply gas.

Refer to Table 2 and Table 3 for high altitude orifice part number. For replacing orifice refer to specific instructions included with conversion kit.

Table 2 - 90 - 50/75/100 SERIES 2 NATURAL GAS

MODEL 90-50

 

Stock Factory

 

 

Btu Value of Natural Gas++

 

 

Settings

750

 

850

950

 

1000

1050

Altitude in Ft.

0-5,000

 

 

 

5,000-10,000

 

 

Normal Input (MBH)

50

–

 

–

–

 

–

–

Manifold Pressure In W.C.

2.5

4

 

4

3.5

 

2.5

2.5

Orifice

43331094

 

 

 

43331094

 

 

 

MODEL 90-75

 

 

 

 

 

 

Stock Factory

 

 

Btu Value of Natural Gas++

 

 

Settings

750

 

850

950

 

1000

1050

Altitude in Ft.

0-5,000

 

 

 

5,000-10,000

 

 

Normal Input (MBH)

75

–

 

–

–

 

–

–

Manifold Pressure In W.C.

2.5

3.5

 

3.5

2.5

 

2.5

2.5

Orifice

43331092

 

 

 

43331092

 

 

 

MODEL 90-100

 

 

 

 

 

 

Stock Factory

 

 

Btu Value of Natural Gas++

 

 

Settings

750

 

850

950

 

1000

1050

Altitude in Ft.

0-5,000

 

 

 

5,000-10,000

 

 

Normal Input (MBH)

100

–

 

–

–

 

–

–

Manifold Pressure In W.C.

2.5

3.5

 

3.5

2.5

 

2.5

2.5

Orifice

43331090

 

 

 

43331090

 

 

++Contact local gas utility or distributor for Btu value of gas.

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Lennox International Inc GWB9-050IH-2, GWB9-075IH-2 Boilers for USE AT High Altitude United States Installations
Page 5 Page 7

GWB9-050IH-2, GWB9-100IH-2, GWB9-075IH-2, Gas-Fired Hot Water Boiler specifications

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