508189-01
Issue 2116
Page 24 of 42
Capacity
Gas
Manifold Pressure
in. wg. 0 - 4,500 ft.
Manifold Pressure
in. wg. 4,501 - 7,500 ft.
Manifold Pressure
in. wg. 7,501 - 10,000 ft.
2
Supply Line Pressure
in. wg.
Low Fire High Fire
Low Fire
High Fire
Low Fire
High Fire
Min.
Max.
070
Natrual
1.7
3.5
1.5
3.2
1.7
3.5
4.5
13.0
LP/Propane
3
4.5
10.0
4.5
10.0
4.5
10.0
11.0
13.0
090
Natrual
1.7
3.5
1.5
3.0
1.7
3.5
4.5
13.0
LP/Propane
3
4.5
10.0
4.5
10.0
4.5
10.0
11.0
13.0
1.
This is the only permissible derate for these units.
2.
Natural gas high altitude orifice kit required.
3.
A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for
the conversion procedure.
NOTE - Units may be installed at altitudes up to 4500 ft. above sea level without modifications.
Table 12. Manifold Pressure and Line Pressure at Various Altitudes
Capacity
High Altitude Pressure Switch Kit
High Altitude
Natural Gas
Oririce Kit
Natural to LP/Propane Kit
LP/Propane to
Natural Kit
0 - 4,500 ft.
4,501 - 7,500 ft. 7,501 - 10,000 ft. 7,501 - 10,000 ft.
0 - 7,500 ft.
7,501 - 10,000 ft.
0 - 7,500 ft.
All
No Change
91W53
73W35
51W01
11K48
11K47
77W10
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.
Table 13.
Orifice Kits and Pressure Switch Kits at Various Altitudes
